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ESRI ArcGIS - Science topic

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Questions related to ESRI ArcGIS
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Looks like DEM data with 10m resolution is available only for the United States in USGS, SRTM, ASTER, and other sources. Are there any other open data sources that provide 10m resolution DEM images- for India?
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Check out this Geo platform link above.
Attached is a brochure of their product from their platform.
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  • I am trying to use the DSAS tool (version 5) for both ArcMap 10.4.1. and ArcMap 10.8 in Windows 10. I am able to output the transects, but when it comes to trying to calculate the statistic. I get an error message telling me to reference the DSAS_log (photo attached) (which does not provide a clear solution of what the error is). I wonder how to solve this problem? I have tried to re-create the baseline multiple times and am getting the same error for both two versions of ArcMap (10.4 &10.8). Knwoing that I followed the Guide and I am using (English US and mm/dd/yyyy format).
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I had the same problem and solved it by working on preprocessing. My steps were: Digitize the shorelines (with a fixed zoom scale) and create a baseline on the mainland, you may have to create both on the mainland and on the water (depending on our region). You must use shapefiles in the same coordinate system, and must be based on meters (UTM). In the case of your shorelines had been digitalized in different shapefiles, use the "Merge" tool to join all shorelines in one shapefile. In ArcCatalog, click with the right bottom in the folder you want to put your geodatabase, so go to "New" and in "Personal Geodatabase". After that, with a double click in the archive just created, click with the right bottom in the space of it, and go to "Import" to put there two shapefiles, one with your shorelines and other with the baseline(s).
Some classes and their types are required, so you should check if your shapefiles have:
- Baseline:
--> User created: id (Long Integer)
--> Created by DSAS through Attribute Automator: SHAPE_Length (Double), DSAS_ID (Long Integer)
- Coast:
--> User created: id (Long Integer), Uncy (Double), Date_ (Text).
--> Created by DSAS via Attribute Automator: DSAS_date (text), DSAS_uncy (Double), DSAS_type (text)
I leave the uncertainty field (Uncy) empty and DSAS defaults to 10 meters in this case. After that, I used the DSAS video (https://www.usgs.gov/media/videos/introduction-dsas-v50-sample-data-workflow) as a guide.
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I have two datasets. One with 9 past cyclones with their damage on the forest, wind speed, distance from the study site, recovery area. Another dataset with future sea-level rise (SLR) projections and potential loss area due to SLR.
  1. By using data from both disturbance events datasets (loss area, recovery area, wind speed, predicted loss area from SLR) can I create any kinds of disturbance risk/vulnerability/disturbance index/ hazard indicator map of the study area?
  2. What kinds of statistical analysis can I include in my study with these limited data sets which will help me to show some sort of relationship of "Loss Area" with other variables?
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Respected All
The data which is available at https://swat.tamu.edu/data/india-dataset/ , the file named "SOIL_WATERBASE.7z" on this link has only the raster along with "VALUE" and "NAME" of the soil series, which is taken/subsetted from HWSD_FAO,
But the database file require a large number of inputs of different soil properties, for these soil series like, compaction, number of layers, Texture, Bulk density, Available water capacity, Proportion of sand silt and clay, etc, in the dbf file, which has these columns
OBJECTID
MUID
SEQN
SNAM
S5ID
CMPPCT
NLAYERS
HYDGRP
SOL_ZMX
ANION_EXCL
SOL_CRK
TEXTURE
SOL_Z1
SOL_BD1
SOL_AWC1
SOL_K1
SOL_CBN1
CLAY1
SILT1
SAND1
ROCK1
SOL_ALB1
USLE_K1
SOL_EC1
SOL_Z2
SOL_BD2
SOL_AWC2
SOL_K2
SOL_CBN2
CLAY2
SILT2
SAND2
ROCK2
SOL_ALB2
USLE_K2
SOL_EC2
and so on_____________till 10 layers (if available)
The another file named " soil_HWSD_FAO.7z " has its global raster without any information about the soil properties which are used in input database.
I have sub-setted/clipped the indian raster from the global,
although the global raster was missing spatial referencing,
So if someone is sub-setting the same for their area of interest, then you have to manually geo-reference the subsetted image to use it while creating HRU's.
Kindly share if you have any idea about, the source of the soil properties for these soil series.
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Hey! Abhilash plz Share protected password with me
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I'm working on a closest facility analysis using ArcGIS ModelBuilder and I want to enable the user to add locations interactively (i.e. clicking on the screen, not using any table or source layer).
In other words, I want something like 'Create Network Location Tool' or 'Create features' in Network Analyst and Editor toolbars, respectively. But how to incorporate it into ModelBuilder?
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Sir Daniel! I want to find out the same thing. Can you help me with your conclusions on the problem?@
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I need to show the line's length while drawing a polyline in ArcMap. How can I that? (not in ArcGIS Pro).
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Stuart E. Hamilton Thanks for your help
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I have downloaded IMD Gridded data (0.25 by 0.25 resolution) from the IMD website for my study I need monthly rainfall data. How to convert daily gridded data to monthly and seasonal rainfall data
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Hi,
Hope you are doing well. Please Eviews software has the option of data conversion, either from low frequency data to high frequency data or vice versa. You may watch videos on it from YouTube to guide you on that. Good luck
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I have some geospatial data points (X and Y in decimal degrees) and the concentrations of a certain parameter for each point. I want to create a heat map to show the density of the concentrations not the density of data points. In Youtube, I found several tutorial for how to create heat map to show the points density. But I want to show the concentrations density in my case.
By the way, I'm using Qgis to create the map.
I appreciate if you share any information or experience in this case.
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Hi Termeh,
You may use the mapping system connected to excel software.
It may give such this result:
Best wishes.
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What is MODIS's default Geographic Coordinate System and projected coordinate system? My study area is Bangladesh. I found the image distorted (the upper portion is bent towards left and lower portion is bent to the right. Pics attached). How can I project them to Geographic Coordinate System: WGS 1984 and projected coordinate system: WGS 1984 UTM Zone 45N ?
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Mr. Aqil Tariq is correct. Please open the MODIS product in Arc Map 10.8, and search projection, and add projection and zone and then select output path, and click Ok. Thank you.
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I need shapefile for all 700+ districts of India. From where I can find the India shapefile with all districts. Also, suggest how to get the latest India shapefile with all state and union territories (28 states + 9 UT's).
Thanks
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You can download shape file using this link.
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I already have a Basemap in my document, but when I try to add another one my ArcMap crashes.
This also happens if I try to add a new Basemap in a new document.
Does anyone solved this problem, or knows how to solve it?
Thank you,
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Hello Ferran, It is usually related with the computer settings... If it crash, usually it means the computer is not strong enough to deal with the basemap. Hope it helps!
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I 'm calculating AWC (Available water capacity or available water content) trough ArcMap in Relation to Soil Texture and Organic Matter (showed in raster type of data) with help of Raster Calculator and Map Algebra expression con().
Soil texture is calculated via QGis (SAGA) tool Soil Texture Classification. In soil texture layer from 100 to 200 cm of soil depth aformentioned tool find texture class with number 4 (Sandy clay) which is unknown to this clasification:
Can anyone tell me range of AWC for this type of soil texture class with relation to Organic Matter?
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In AWC, clay content is the major contributor (See the attachment) and organic matter will be to some extend . Because organic matter will be @ 1 % or <1% in majority of the soils of tropical region whereas clay content is ranging from 30 to 50% in Sandy clay soil. Hence contribution of clay will be more. Every 1% of OM, water holding capacity will increase up to 3.7% ( Hudson, B. D. 1994. Soil organic matter and available water capacity. J. Soil Water Conserv. 49: 189–194).The contribution of OM (1%) in water retention might be 2 to 4 per cent depending upon the synergy of clay content.
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I have a shape file containing almost 3000 points and a delimited text layer with almost 500 points. What I want to do is to calculate the distance between each 500 points and the nearest point to it in the shape file. Therefore, 500 distances should be calculated at the end. Could you please tell me what is the best way to do this in Qgis?
I would highly appreciate your help.
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Nearest Neighbor Analysis
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I have two DEMS, one which includes the bulk of the country, and the other fills in the gaps. I basically want to use the one to fill in the gaps of where values = 0 in the other DEM. One question on here was answered with " create a mask so that all cells that have NULL-values receive the value 1 and all other values are assigned with the value 0. Then overlay this mask with the old DEM-layer by using the multiplication function. Finally, overlay again the output layer with your current DEM-layer to fill the gaps, but use the sum-function this time instead of the multiplication-function.". But I am unaware on how to create a mask? Can anyone offer advice or a better method? I tried to SetNull and remove all of the 0 values from the main one, but there are some spots which have the value "0.0000006" which are also gaps. Can I create a mask which removes values 0-1? and then somehow overlay the other? can I just remove the null values and mosaic to new raster?
To clarify its two DTMS (one older than the other), same cell size, same coordinate system, but the main one has gaps that I want to fill in with the other one.
I have attached an image of the two DEMs. one is the lighter one, and the one at the back is the "filler" DEM. As you can see there are holes in the main DEM itself, and the background one also includes island that I want to include. I need to remove null values from the main one then fill in the empty space with the background DEM.
Thank you for your help in advance!
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Use ArcMap GIS or ENVI
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It seems impossible since most of analyses are based on 3x3 cell neighborhood but I would like to hear your experiences. I know that some hydrodinamical models like TELEMAC are able to perform this.
Cheers
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Dear Mirko,
Please a look to the attached paper, which may address your question. It is about using multi-resolution image representation for texture analysis. I used MATLAB to implement the presented idea. But it is not difficult to implement it in ArcGIS. These are so many applications that can benefit from the instanteneous use of multi-resolution image representation such as image matching and the detection of the intrinsic scale of image features.
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A local fault shapefile prepared by a public academic institution was required to complement a qualitative analysis. It was not possible to access a study or technical report documenting the data obtained, so the only reference is the file itself. How should it be reported in the references list?
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You can cite the shapefile like this:
Format
Author. (Year). Title (version no.) [Data set]. Publisher. DOI or URL.
APA Examples
City of Ottawa. (2018). Wards [Data file]. Retrieved from https://open.ottawa.ca/datasets/wards.
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I have seen this style of map images repeated in several articles, but was never able to find the software required or a method to reproduce them. Does anyone know how to obtain them?
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In case someone is still looking for an answer. I found this video explaining how to do it.
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Dear all,
I am trying to replicate some results from a publication. There, one of the datasets they use is WISE30sec map (available for download here: https://www.isric.org/explore/wise-databases). My problem is that even tough they state the following:
"The zip file includes a raster GIS file (WISE30sec) as well as a range of soil attribute data files (see Appendix 3 of the documentation). Using ArcGIS® or similar, users may join the raster data to the derived soil properties files, as managed the MSAccess® database (WISE30sec.mdb). Linkage is through the map unit code or grid cell identifier (NEWSUID) of the raster set and the NEWSUID of the various soil attribute data files."
I am unable to perform the above-mentioned join as I fail to find the grid cell identifier (NEWSUID) when using the Add Join function. ArcMap only shows the fields "ObjectID", "Value" and "Count" and none of them coincides with values shown at the tables I am trying to access. I have tried to copy raster and build attribute table but it didn't work. Also, when I put it in R, I cannot see these attributes that the raster is supposed to have.
Thank you in advance.
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I tried to do the join with the dataset WISE30sec and some tables in the mdb DB. It worked for me, both joining the table directly form the TOC and using the Add Join tool, as you can see in the attached pictures. I used ArcMap 10.3.1. Is there something i missed?
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What is the most suitable interpolation method (IDW, spline, kriging, natural neigbours) for evenly and dense distributed points (attached picture .jpg)? and if you recommend any can you explain shortly why this method. Thank you.
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Kriging. In specific cases spline also give control.
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MODIS has surface reflectance product too from where we can produce land cover output after supervised classification. From my knowledge of concern Landsat, Sentinel etc. only provide surface reflectance products. Later land cover is derived by us. But why does MODIS provide land cover product (derived from surface reflectance) by itself? Is it because their spectral resolution (250m, 500m, 1000m) is lower than others (10m, 30m) and so a land cover output derived by us will have less accuracy?
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If you are not satisfied with the product, you could classify the dataset by yourself. Good luck.
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For my thesis, which thematizes a GIS-based industrial site selction in Europe, i am in need of a method to integrate all of the european NUTS 2-regions (253 units). The methods which i had in consideration (PROMETHEE, SMART) seem to usually compare very few scenarios.
Especially the part of rating my criteria is creating trouble because i haven't found a structured method for my issue.
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Hello Nolberto,
thank you for letting me know. I've sent you a mail with another adress.
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How to calculate Stream Power Index (SPI) and Topographic Wetness Index (TWI) in Arc GIS?
Looking for syntax
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Dear@ Taha Sadeghi Chorsi ,
I think you should get them wrong. This site gave a detailed explanation about SPI, TWI and STI
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I have a road shapefile in polygon format and I want to take the centreline and end up with a shapefile in line format because I need the road's intersections.
Thank you in advance!
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You can also create your buffers based on attribution (field), without breaking them in classes, that will have variable buffer distances dependent on your different widths (widths/2).
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I am facing problem to cut a polygon shape-file from raster image using "Extract by Mask" tool.
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Check both layer extent and projection.
And also be careful about saving file location and name too
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My observations are points along a transect, irregularly spaced.
I aim at finding the distance values that maximize the clustering of my observation attribute, in order to use it in the following LISA analysis (Local Moran I).
I iteratively run Global Moran I function with PySAL 2.0, recreating a different distance-based weight matrix (binary, assigning 1 to neighbors and 0 to not neighbors) with a search radius 0.5m longer at every iteration.
At every iteration, I save z_sim,p_sim, I statistics, together with the distance at which these stats have been computed.
From these information, what strategy is best to find distances that potentially show underlying spatial processes that (pseudo)-significantly cluster my point data?
PLEASE NOTE:
  • Esri style: ArcMap Incremental Global Moran I tool identify peaks of z-values where p is significant as interesting distances
  • Literature: I found many papers that simply choose the distance with the higher absolute significant value of I
CONSIDERATIONS
Because with varying search radius the number of observations considered in the neighborhood change, thus, the weight matrix also change, the I value is not comparable
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Hi everyone,
after a little research, I finally came up with the answer I was looking for.
Short answer:
when using Global Moran's I index (I) with incrementally increasing distance searches (thus, changing the weight matrix at every iteration), only the the z-values are independent from both weight matrices and variable intensity variations, thus, they are comparable across multiple analyses.
The I in Moran's I statistics is not comparable across analyses, i.e, if with distance of 10m I=0.3 and distance 15m I=0.6, we cannot say that with a distance of 15m the clustering strength is double.
We could only say that in both cases there is a positive (sign of the I) spatial autocorrelation.
For the strengths, we use the z-values.
That is why ESRI plots distances in the x-axis and z-values in the y axis, indicating significant (p-value < than specified signification level) peaks as interesting distances.
For more information, it is clearly explained during a class that Luc Anselin in this Global Autocorrelation class, given in 2016 in Chicago University.
follow from minute 38 when he talks about the permutation approach.
Enjoy!
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Hi there,
I have group of pixels that I created by region group tool and I would like to measure the length and the width of each pixel group. My main goal is to extract the structure of each pixel group i.e whether it is linear or other pattern.
Would you recommend any tool for that?
Thanks in advance
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As László suggested, the simplest approach to calculating geometry of a raster is to vectorize. This is because it provides clear nodes or points that can be measured to and from. We can estimate parameters like length or width from a raster by counting cells along a vector, but this is not a common approach. Alternatively, some script treat rasters like vectors by using the each cell's x,y and z as a point vector, so if you were against vectorizing to a polygon but still wanted to you a mapping software like ArcMap or Qgis,, you could vectorize to points. The disadvantage of not going to polygons is that you would lose a simple way to get perimeter and area, metrics that are useful for characterizing geometric shapes.
In our publication (Kasprak et al, 2017 10.1002/esp.4143), we used ArcPy (the programming part of ArcGIS) to do something similar to classify shape characteristics of areas with topographic change. In this system we converted raster classes to vector without smoothing, then used a minimum enclosing ellipse to objectively get the max length, width and azimuth orientation.
If you wanted to take it a step further, you could calculate a "compactness" index where you compare the actual area of your raster classes to the area of a minimum enclosing ellipse or rectangle. Compactness near 1 would have shapes that are less complex and compactness near 0 would be more complex. A similar approach can be done with ratios of perimeter to area, as we did in the publication.
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we are considering to develope the SUSTAIN model adding some new functions. the officia website on USEPA applied the source code of its interface and simulation engine, but it's an extension tool based on arcgis 9.3.1, we have no idea to use the dll files, got from source code, with arcgis platform.
asking for help sincerely, by a rookie.
moreover, is there any possibility to transplant this model to newer version of arcgis 10.x, that could be a "big" project which USEPA was not willing to do.
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I think SUSTAIN Was developed by a private company on behalf of the US EPA and you might be able to get specific information about modifications from them.
The SUSTAIN manual refers to the company as follows:
Tetra Tech, Inc.
10306 Eaton Place, Suite 340
Fairfax, VA 22030
And the authors on the manual included:
Leslie Shoemaker, Ph.D.
John Riverson Jr.
Khalid Alvi
Jenny X. Zhen, Ph.D., P.E.
Sabu Paul, Ph.D., P.E.
Teresa Rafi
If you can find a contact for any of these folk on researchgate, Linkedin, or elsewhere, you may get a response? I was able to talk to some people at Tetra Tech back in 2013 or so about using SUSTAIN so they may still be open to discuss how easy it might be to port the model to ArcMap 10, and/or modify functions?
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Hi, I am in a problem with this matter. When Masking or Clipping a DEM file and Landsat image with the same shape file in ArcGis, this shows different column and row numbers in the properties for DEM and Landsat composite or land cover map.
The same Column and Row number is required for many modelling aspects.. Can anyone tell me why this is happening?
Thanks
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Hello MD. Hossaim. I have been using QGIS software for these tasks.
You need to adjust both raster files in one SRC and make sure they have the same spatial resolution before cutting with the vector file (which can be shapefile).
These informed steps do not guarantee success in clipping. Because? because pixels may not match spatially (precise spatial coincidence). In this case, spatial adjustment or geostatistical interpolation and formation of new raster layers (Landsat and DEM) with the same spatial characteristics, xmin, ymin, xmax, ymax, spatial resolution and pixel size should be performed.
I hope I have contributed your research.
More information I am available.
Best regards
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Is it plausible to use NDVI along with other regular bands for image classification related data processing? Recently, I came across a comment that RED and NIR band might interfere with NDVI or vice versa during the processing. I am working on a project where I want to classify healthy and stressed crop patches in fields using satellite imagery, and I am using all four bands (RGB and NIR) along with NDVI to train the model and classify the satellite images. For the classification, I am using Random Forest algorithm.
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Estimado,
Puede combinar las diferentes bandas y revisar la fenología de los cultivos o coberturas para hacer una mayor análisis de los resultados. Saludo
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I have calculated soil erosion by RUSLE model,
but now I want to calculate the SDR rate
please suggest !
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Can anyone help me in finding the Meghalaya state shape file with 11 district borders. The available shape file contains only 7 districts.
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Hello,
I tend to go to GADM when looking for boundaries data: https://gadm.org/index.html. I haven't checked specifically for what you want, but I think it is worth looking at.
Here's the Wiki page, too: https://en.wikipedia.org/wiki/GADM.
All the best,
Joe
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I'm trying to plot U and V vectors in ArcGIS. I followed the method:
In which, point no. 7) Choose <expression> in the drop-down list was not available in 9.3 version. 
To do this in other way, I added a field in the attribute table "Rotation".
Using Filed Calculator, I tried the 'function' written in point no. 9) 
9). Specify one of the following expression:
Oceanographic Convention: (180/3.14) * Atn2([u],[v])
Meteorological Convention: (180/3.14) * Atn2([u],[v])+180
It was failed due to error in the code.
What is the correct code to write the "Oceanographic Convention: (180/3.14) * Atn2([u],[v])"?
Or is the any other way to plot in Arc?
Thanks.
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How can I plot U and V wind vectors in ArcGIS 9.3
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I have a (1) polygon/shapefile of administrative boundaries
and a (2) a raster with different categories (e.g. 1, 2, 3, 4, 5,)
I would like to determine the area of the raster (only category 1) within the polygon/shapefile .
I have tried converting the polygon/shapefile into a raster (feature to raster too, with similar pixel/grid sizes) and combining the 2 rasters. I then estimated the area by looking at the resulting attribute table.
However, I'm not too sure if this is an appropriate way to do this.
Thus, is there a more appropriate/easier method?
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1. Clip the raster within boundaries.
2. Use zonal() function from raster package for R in such way: zonal(rst2, rst2, 'count')
3. Multiply pixel count for map class 1 by pixel area.
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I would like to conduct unsupervised classification to identify different shoreline typologies. How will I be able to extract only the shoreline imagery data from a Landsat 8 multispectral image on ArcGIS to conduct unsupervised classification into different shoreline typologies?
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Hi, good so far done.
Do you have ERDAS Imagine software. This software used widely for satellite image processing and inclusively help full for your analysis of this study. I do have that software and worked out all these thematic typologies for shoreline using different techniques, different multi spectral images. So far share the clipped image or mosac image for working. I will apply the needful algorithms and do share with you for further analysis. You may upload the multispectral image (clipped to shoreline ) in Dropbox
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To plot the graph: My question is should i use average ndvi >0.5 to capture reflectance of vegetation only excluding soil and detritus?
Or simply use average ndvi without a need for it to be >0.5?
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You are welcome Dear Yassir,
I don't know this crop. But after having a look in Google, i confirm that you have to consider NDVI values >=0.1-0.2 especially if you want to take into account for the early growing stages.
* you have to be carreful with this threshold. it depends on your data type (sensor) and also on the soil type. In general, very low values of NDVI <=0.1 correspond to barren areas of rock, sand, or snow. for more accuracy, you need to make some ground measurements!
good luck
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I was trying to download Landsat 8 scenes for 3-4 years by using USGS Bulk download application, but I think its download speed is too much low than other download managers, even the internet download speed was 70-101 Mbps.
Then Tried the same with IDM and FDM they are working perfectly with individual scenes. As Landsat 8 data does not support resume option (may be in Batch or Bulk) so the batch download was not working out.
But adding individual scenes takes a lots of time in selection, so I just wanted to know that is there any substitute for that ?
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Sumedh-
I would encourage you to submit data via the USGS EPSA website https://espa.cr.usgs.gov/index/. You can input a text file of scene ID's (exported as a csv from a search in EarthExplorer). Then once you receive you order you can download using python. See
Good luck.
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Hello everyone,
I work with the digital shoreline analysis system (DSAS of USGS) to my thesis, in the process i have a error with the calculate change statistics. The program say: "Unable to find output file 'C:\Users\...DSASCore.out.xml'
Does anyone know what the solution is?
Thanks!
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Thank you Jan Kinne and Federico Solano the error was very simple to solve. In the guide to program appears the solution.
"The computer must be configured to English (USA) and the date format must be mm/dd/yyyy. From the Control Panel menu, choose 'Regional Configuration and Language'> select 'English (USA)' and modify the date configuration to 'mm/dd/yyyy.'"...
Thanks for answering my question.
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I have accidents data that I would like to geocode using ArcGIS/ArcMap, however, I don't have the exact addresses of the location of the accidents.
The data that I have includes 3 columns of the location data:
(1) On-street
(2) At/Between street
(3) Between street
Which derived into, accidents that happened at (1) between streets (2) and (3).
I could easily geocode (1) and (2) to get the intersection of which the incidents happened, which is true for some data, since (3) is blank, however, most cases have (3) in which accidents happened at street segments instead of intersection.
Hopefully will be able to figure this out, thank you.
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I haven't used Geocoding option since the days of ArcMap 10.1. Is it possible to build a secondary address locator and use it in conjuction with the primary so that what falls out of the geocoding from the primary can be filtered through the secondary? Set the match rate value not too high so that manual matching is possible at the end.
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I would like know the methods to extract shoreline using LANDSAT image utilizing ESRI ArcGIS software:
-To calculate shoreline erosion rate
-To draw historic shoreline changes
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To extract a polyline (e.g. shoreline) from a raster image (e.g. LANDSAT image ) there are a few options using ArcGIS Desktop:
  1. Just digitise....click click click (this can be quicker but can also hurt your knuckle joints :-)) but for a small area it can be quick and easy to crack on and do that.
  2. If you have Spatial Analyst then you can:
--->> Multiply the raster by 0 to create a constant value raster using Raster Calculator. (be sure to convert it to integer type or step 2 will not work)
--->> Convert the result of step 1 to polygon using the Raster to Polygon tool (in the Conversion toolbox)
3. If your have 3D Analyst license then you can use the Raster Domain tool under 3D Analyst>Conversion>from raster (however it does not have the smooth function)
References
ESRI Help pages to have a read...I've assumed your on ArcGIS Pro though the tools are basically the same with ArcGIS Desktop (editing has changed a bit).
Editing and digitising:
Raster Calculator:
Raster To Polygon Tool:
Raster Domain tool:
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ArcGis 10.2, 10.3 etc. I will be very thankful if someone send it to me.
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Can you please guide me with the steps to prepare a geological map with elevation. Note: I have the shape file of the geology and DEM file and result map would be like the attached one.
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1 Create the hillshade from the MNT by the spatial analyst extension
2 Place the lithology shp above hillshade
3 Reduce a little the transparency of the lithology layer
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I wish to know the basic steps to be followed in creating the ascii file for various habitat covariates.
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Dear Letro,
This is very straightforward in R! You can read in your .nc (NetCDF) or .gtif (GeoTIFF) files and then export them as ASCII files, as it is required by MAXENT:
#### Simple R code example ####
library(raster)
library(ncdf4) #this is only needed if your input files are .nc files
my_covariate1 = raster("\your\location\to\the\file\my_file.tif")
writeRaster(my_covariate1, filename="my_covariate1.asc", datatype=' ascii ', overwrite=TRUE)
Hope that helps!
Maria
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As part of a research work, I am modelling Land Use/Land cover changes over the span of 4 decades on a 40 km² watershed in a rural area located in sahelian climate (west africa). I am mainly interested in three types of land units, namely bare soils, cultivated soils and vegetated areas. I have been able to map them accurately enough using remote sensing analysis of Landsat 5 TM/Landsat 8 OLI Images. As such, I now have land cover maps for the watershed at four dates, 1985, 1995, 2007 and 2017. I am now looking into modelling the changes using a set of driving factors (yet to be identified) and assess land cover changes. I ran into land use simulation models mostly based on Cellular Automaton (CA) concepts such as Land Use Sim (http://www.landusesim.com/landusesim-land-use-modeling-simulation-software/) but it seems to be a paid software. Are there any other free simulation software/packages one can point me at ? Preferably, something that can be easily tight to a GIS environnment (ESRI ArcGIS for example) for easier raster/vector processing.
Thanks in advance.
Roland.
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There are several LUCC models for free. One quite widespread and famous is Dinamica Ego (http://csr.ufmg.br/dinamica/). You also have the CLUE model (http://www.ivm.vu.nl/en/Organisation/departments/spatial-analysis-decision-support/Clue/index.aspx) developed by a research team in Netherlands.
Also in this paper ( An open and extensible framework for spatially explicit land use change modelling: The lulcc R package) you can find the presentation of a R package which includes two LUCC models, being CLUE one of them if I am remember well.
For a general overview, you have short presentations of several LUCC models in the last part of this book: http://www.springer.com/us/book/9783319608006
I have given you above the links to some of them. However, I am sure there are another ones different which are also for free.
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Hello, I am student of physical land resources:soil science. I want to develop my career in the field of GIS and Remote sensing application on soil science, agriculture, land and water management and hopefully environmental assessment.
I am now trying to learn theories behind GIS and Remote sensing, However I need to learn the software and tools. I am asking to the respected scientist communities please to suggest me name of most useful software. I have found QGIS is a free one and is a very powerful one unless it has some lacking other than ArcGIS.
I also found ERDAS IMAGINE and ENVI are both paid one, but some people say ENVI is far better than ERDAS.
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I believe that the analysis you do is correct, and in your case I would opt for the same options. ArcGis is certainly a great tool for this work but given its cost in most cases with a good use of QGIS and creativity you can achieve the same goals. Regarding ENVI it is a very complete and appropriate application. Successes
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Hi all,
I'm interested in marking employment status for all (626) Indian districts, in STATA. I'm trying to get the shape file and is currently inaccessible.  It will be of great help if some gives idea on how to get it.
Thanks.
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dear this shapefile for Indian
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I'm about to analyse habitat selection in a owl inhabiting coastal and maritime heath habitats. I have GPS-positions and want to check if the owl are more likely to stay at elevations in the terrain. I have digital elevation models (DEM) for the area and want to calculate habitat openness. I tried Package 'horizon' - cran.r, but got some strange results. Anyone that could help calculating habitat openness from a digital elevation models (DEM)?
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Via the processing toolbox you can find a tool called Sky view factor. It is based on this work
and calculates, among others, the visible sky as a percentage of the unobstructed hemisphere above a certain location.
I tried it with your data and it could work for your owl habitat mapping:
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I have used AHP, Frequency Ratio (FR), and Fuzzy Logic (FL) to create land suitability maps in the GIS environment. Do you know other methods?
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If you create land suitability model so you have face pixel mixing problem for accuracy purposes.
Weighted Overall analysis method for land suitability map & sub- pixel is another very good method for pixel mixing of classes.
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Searching for a tool/plug-in/add-on/software for visualizing flow network from flow direction. I tried with ArcView 3.X but it is difficult to use that one. I also tried with Cell Tool and it didn't work in my case. Actually, anything with some advanced feature is fine for me. Any suggestion regarding it will be highly appreciated.
I have attached one map prepared using ArcView 3.3. Thanks in advance.
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What about SVG graphics? There is a free tool, Inkscape,
for experimenting. An SVG image essentially is an
XML file. You can create it like any other file,
and display it in a web browser or in a browser control.
You can also manipulate the DOM tree with JavaScript.
Regards,
Joachim
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I have done rediometric correction, TOA which was used for a tasselled cap transformation on Landsat images with 30m resolution. Now i want to use regression modelling to relate the tasselled values (greeness, wetness and brightness) to impervious surface values from digitized high resolution images. i am using this approach to quantify imperviousness in an urban area, but i am stack at how to apply the regression model (in Arcmap 10.1) to achieve this. I will be grateful for your suggestions
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Thanks for the contribution. i tried to convert to points by first covertingvto polygon but receives an 000863 error message; Invalid GP data type, somthing to do with converting from a floating file type to non.floating, yet to sort that out. Will keep you posted. Joel
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In our project, we did traffic study for around 8 roads and we want to extrapolate that data to remaining roads(approx 50 roads). Is it possible to extrapolate data among line features ? In this process what are the attributes we have to consider for extrapolating ?
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I think your question is much to broad. What do you want to extrapolate (known car counts at some position from 8 lines onto 50 unknowns, or individual cars, or from the timestamp of measure onto some timespan)? Do you have a road network (connected lines), and do you expect the traffic to flow in this network? Shall different road designations have influence on the traffic? Are there traffic sources and sinks? And so on. In my opinion the more dynamic your process is, the less appropriate are out-of-the-box tools of GIS Software, and ist up to you to develope an algorithm or algorithmic approach to solve the problem.
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Hi everyone,
For a global scale project I'm working on right now, I'm wondering if I can use Net Primary Productivity data as a proxy to potential post-fire recovery. My basic thinking here is that pre-fire NPP conditions help post-fire recovery, i.e. facilitates it in the case of high NPP levels, which would mean that existing natural conditions help vegetation to thrive.
Obviously, many other factors condition post-fire recovery, but I'm looking for references that may validate or invalidate this thought. I was not able to find anything so far. Any insights?
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In issue in your research design is the selection of NPP as the independent variable and recovery as the dependent variable. How are you measuring the NPP (actual, potential) or are you intend to predict NPP? How do you define recovery? Pre-fire biomass, NPP or species (diversity)? Recovery in all three features is by definition fast in pyro-climaxes on the millennium time scale like the Mediterranean biomes (maquis; garigue, fynbos, savanna, steppe) and those on the century timescale (taiga, heath). Further you may consider your time scale.
An issue you may consider in less frequently burning biomes is the whether the pre-fire plant growth is N or P limited as N is removed from the system by fire.
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Steps to WGS1984 ASCii file project to Kertau_RSO_Malaya_Meters ASCii file. Been trying but still not projected well.I cannot open in FMP stated that this file has no projection. Seeking an answer from all experts and professors. Thank you and appreciate your feedback.
I have also attached my original file for reference.
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Thanks to all and I really appreciate for your advice and answer. =)
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I have soil contaminant samples collected at different depths/layers. I generated a contaminant surface at each depth/layer using ArcGIS krigging tool. However, I need to have a vertical feel of this contaminant across layers and which I think I can achieve by interpolating the values across the different layers. As far as I know ArcGIS can't do this. So, I will be happy to know any freeware I can use to achieve this. Many thanks.
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I would use GRASS GIS module v.vol.rst which interpolates vector point data to a 3D raster map using regularized spline with tension algorithm (RST).
Here is a small example in command line syntax (you can do the same in Python, GUI or modeler):
v.import input=points.shp output=points
g.region vector=points res=0.5 t=5 b=-15 tbres=0.5
v.vol.rst input=points wcolumn=values_column tension=20 smooth=0.6 segmax=400 dmin=0.5 zscale=100 elevation=result
r3.to.rast input=result output=result_slice
where:
points.shp is name or full path of a vector file you want to import (uses GDAL/OGR)
points is the name of the vector map in GRASS GIS
values_column is name of a attribute table column with values to interpolate
result is the resulting 3D raster map
result_slice is a beginning of a name for 2D rasters created from horizontal layers of 3D raster
v.import imports the data into GRASS GIS database
g.region set the computation region extent and resolution (2D and 3D) for subsequent raster calculations
v.vol.rst does the 3D interpolation
r3.to.rast does horizontal slices of the 3D raster and creates a series of 2D rasters
The result is a 3D raster which you can further analyze or visualize in GRASS GIS or you can slice it horizontally into a series of 2D rasters and analyze and visualize them (or export them using r.out.gdal).
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When I geocode large files in ArcGIS 10.3, I receive the following error, “There was an error trying to process this table.” In researching this issue, it says that one cause may be because the file is corrupt. However, this error goes away when I just cut down the number of cases I’m geocoding. Is there an easier fix for this issue?  
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Hello all,
Can anyone tell me the right procedure to drape an image over Digital Elevation Model.
I have elevation and potential field data ..i need to draw a 3D view of potential field data and draping the image over DEM to get its 3D view (like i have attached ...the figure)
Please help..
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Hi Jitendra,
You should use ArcScene for that. It is specialised in 3D landscape modelling and it is included in the ArcGIS package.
In ArcScene you simply:
1) add your DEM and then you orthophoto
2) right-click on the orthohpoto, properties and click the tab base heights
3) then choose float on (DEM) and that's it!
too easy!
Afterwards, you can always refine the 3D definition by changing the pixel size and the raster definition. But beware that if you use cell sizes too small the computing power (especially RAM) needed to visualise the image-DEM (3D) increase enormously.
There are always trade-offs.
Also, if you decide to make your DEM floats on itself, you will get the 3d visualisation of your terrain. If you drape over it the image, set some meters of offset from DEM to image as often the two datasets intersect each others.
I hope this helped.
Nic
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Hi
I'm working in the spatial analysis of a fragmented forest in a human dominated landscape and I'm looking for a tool to calculate the minimum distance between polygons of the same shapefile in ArcGis.
I have tried already with the "Generate Table Near" tool, but it requires that the polygons are separated in different shapefiles.
thanks to all 
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Did you know about  FRAGSTATS software though this software u can analyzing the landscape metrics easily just try. 
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I am trying to import HDF files of GPM  ka and ku band in  ArcGIS but they lack the spatial information and come as a straight line any suggestions for correcting the projection of the said file i have attached the screenshot after importing the data in ArcGIS and the data file itself also.
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Hi,
Hope this link will help you to perform the conversion of GPM data to ArcGIS.
Good luck.
Vijith H
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These following data are used for flood inundation modelling as link below.
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Hi,
You can get ALOS Global Digital Surface Model from the following website. It is of 30m.
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Hi all,
I would need to calculate the percentage of ice-free area in a certain radius around each of about 200 sampling points in Antarctica. I guess this would be a similar approach as to calculate vegetation cover etc.?
A long time ago I learned some GIS basics using Idrisi, but I haven't used it in 7-8 years and it was very basic. Now, I quite urgently need this data (2-3 weeks, but the sooner the better :) ).
Therefore, any advise is welcome to get me started.
I have the possibility to use ArcGIS and QGIS.
I came across Quantarctica for QGIS, which might provide the map. Any other sources for georeferenced maps of Antarctica?
I guess I can then plot the samples' coordinates, but I then have to manually delineate the ice-free regions by drawing polygons? Or are there layers available giving the ice-free surface or conversely, ice coverage, such that I would only need to detract this from the circle surface?
Can such an analysis be automated?
Sorry for these probably very basic questions. If you can provide me with a good crash-course tutorial (on GIS in general or a similar problem), that would be very welcome too :)
Thanks in advance!
Bjorn
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Hi Bjorn,
There are many ways of answering this question. And of course you can do this yourself. The internet has made our lives much easier nowadays. If you have ArcGIS or any other GIS software it can be done by just typing some keywords on the web. Moreover, there are thousands of online youtube videos that can assist you further. I have the following suggestion for you to give you a head start:
1. After you start ArcMap there is a possibility to add a Basemap Layer. See if you can find Antarctica base Maps.
2. Once you have the base map, you can import the coordinates of the sampling points from an excel sheet and convert it into a point shape file.
3. Draw a buffer around each point. This is an automatic process.
The rest I think you can figure out yourself. Check the links that I have attached. 
However, the questions that I have for you are these: Are you interested in any specific dates or have you collected any satellite imagery of your study area in Antarctica? The area which you are studying, are they covered by ice all the year round or do they change with seasons?
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Hi, this site from ESRI explains the curvature, my question is about the profile curvature. They say that positive values represent a concave cell, were the flow will be accelerated. Negative values indicates a convex cell, and flow will be decelerated. I know other software’s use different signs but the logic of the acceleration shouldn’t be the contrary?I thought that a concave cell would in fact decelerate the flow!! probably read that in other sources but i need something absolutely correct to cite..
Which is right (without comparing magnitudes) a concave surface accelerates or decelerates the flow?
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Here's a graphic I built to help my students learn the difference between plan and profile curvature.
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Is this the cell size (x, y) in the data source tab?
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here is the answer
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Aside downloading ASTER or SRTM DEM, is there anyway I can derive a DEM from a particular study area?
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This question has been asked multiple times in RG. Please search the Q&A section. I have attached one of the links. 
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Dear Researchers and Academics;
I work on the 100% renewable power Global Grid subjects. I am interested in the locations of very large and large renewable power plants.
During my research, I define and describe the importance of the soil conservation regions, water conservation regions and forest conservations regions. These regions have to be untouchable (no settlement, no concrete, no metal, etc.; soil conservation only for agriculture, water conservation only for clean fresh water, forest conservation only for forests). These regions should be large and very large sites.
I thought and assumed that the international governing bodies (e.g. the United Nations) had already worked on these topics, defined, decided, and published a Global Soil Conservation Map (worldwide protected sites)‏, a Global Water Conservation Map‏ (protected lakes, rivers, underground water, etc.)  and a Global Forest Conservation Map (protected forests) for large protected areas agreed upon and published by international consensus (like by the United Nations).
All authorities (regional, national, international) have to obey the borders of these defined and published large protected areas.
I could not find any official map (a map for soil, a map for water, a map for forest) yet.
Can you please send me a Global Soil Conservation Map‏, a Global Water Conservation Map‏ and a Global Forest Conservation Map, if there is one for Global Soil Conservation‏, one for Global Water Conservation and one for Global Forest Conservation.
If there are GIS files for these maps in some formats such as for Google Earth, ESRI ArcGIS, they will be very useful for my research.
I would like to thank all of you who contribute to this question in advance.
Best Regards
Burak Omer Saracoglu
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Hi Burak,
you might find activities of ISRIC - World Soil Information of your interest. Especially their data can be useful for your research (global 1km soil grid, etc.)
Regards
Lukas
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Is it possible to create a 3D geological model using ArcScene in order to help reserve calculation/estimates ?
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Hi!
I'll work with this subject soon, and share any advise and/or information i find.
I'll check this papers too.
Best regards...
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I have calculated EVI of IKONOS and World view-2 image using ArcGIS 10.2. but I can't understand whether the result is correct or not. Can you help me guys to extract values after calculation and check the results?
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I think care should be taken when generating EVI from any satellite other than that provided by the MODIS. The reason is simple, most of the calibration parameters for the conversion of EVI from NDVI consider the Measurement system of the MODIS sensor.
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Hi everyone,
I have a problem with the following: I have altered my raster .tif resolution in ArcGIS and again tried to convert it by ARC toolbox to ASCII (asc) format. So i confronted an error during this process with the name of "ERROR 010267: Syntax error in parsing grid expression. Failed to execute (RasterToASCII)." Can anyone give me a mind regarding this? How can i fix this?
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Dear Vijith
Thanks a lot for your resolutions and gratuities.
Cheers.
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I'm trying to calculate the Leaf Area Index (LAI) of different vegetation species in each state in the US and I'm using a netcdf (.nc4) raster file for the LAI and a usual shapefile (with polygons) for defining the state boundary. I converted the net cdf file into a raster file using the "Make NetCDF raster layer tool". I'm using the Clip tool (< Raster Processing < Raster < Data management tools < Arc toolbox) in the arctool box to clip the raster layer and the polygons. So in this case, my output extent are the states that I choose from the shapefile and the input raster is the raster layer of course. I also checked the "Use Input Features for Clipping Geometry" option so that the raster dataset is clipped onto the perimeter of the shapefile.
Here is my question: Sometimes, there are additional pixels that are created in the output raster dataset, that are actually not present in the original input raster layer. And these pixels also have a value associated with it, which is a cause of concern since some states which should actually have a zero value in it, have a random number in the output file.
Could someone explain what's happening or the possible reasons for this?
Thanks!
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Thanks Maria. This is what I was looking for. Also I figured that there were some additional pixels that were included during resampling, when I used the raster processing tool. Someone had pointed out the error could be because I didn't check the "Maintain Clipping Extent" option. 
Thanks for your response Maria!