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ArcGIS - Science topic

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Questions related to ArcGIS
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Dear colleagues!
We would like to ask if someone knows from where we could get spatial data of Kyrgyzstan (focus Issyk Kul Oblast).
The best would be of course open-access and in formats compatible with ArcPro, QGIS, etc.
We are particularly interested in:
> land use (similar to the CORINE Land Cover, if existent...)
> plant growth/health, forestry
> biodiversity
> climate & precipitation, weather in general
> population (permanent, tourism)
> road network
> DEM
> ... whatever is available
Please let us know,
thank you and best regards!
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Thank you Florian Betz, this is a hot hint!
I'm from Austria, and I didn't know the Austrian-Central Asian Center for GIScience in Bishkek! Also, the other link is interesting.
I'll share it with our student whose PhD topic consists of this biodiversity analysis. Thank you also for the offer to send you a mail. I'll ask her to write to you, in case she has more question.
Best regards from Poland!
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Hello
I provided maps of soil particles (sand, silt and clay) from the data of the points by the geostatistics. Now I want create mapping soil texture classes study area in ArcGIS, Please provide advice
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Ali Akbar Jamali, Really???
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Hello Experts,
I am trying to run an SDM for present and future conditions using Maxent, but the picture of the model appears to be not identical as well as losing a block of pixels near the top of the study area. Note that I had set my study area shape file in 'processing extend' and 'raster analysis' sections while extracting the layers. All the variables were processed at the same extent and cell size for maxent analysis.
Here I attached my study area, present, and future distribution for your convenience.
What could be the possible solution?
Thank you.
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Dear Mokshedur,
After preparing the data to input the MaxEnt Software, You should again cut your data based on the study area's border (Extract by Mask).
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How can i use the following formula in QGIS Calculator:
(your_res /1000)/(6 * Exp(-3.5 * Abs(Tan(("your_slope" * 3.14159)/180) + .05)))
P.s. The formula had been modfied from the orignal function and had been used in ArcGIS
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Osama Samawi I understand you successfully built a slope layer using the r.slope.aspect tool and you're now attempting to construct a fraction of the surface layer using Tobler's hiking function, but you're having difficulties utilizing the calculation in the raster calculator since the exponential function is invalid.
One solution to this problem is to utilize the calculator's exp() function instead of standard exponential notation (e.g. "e" raised to a power). The exp() function raises e to a specified power, yielding the same result as the customary notation.
Here's an example of how the exp() function may be used in the calculation for Tobler's hiking function: (your_res /1000) / (6 * (exp(-3.5 * abs(tan(("your_slope" * 3.14159)/180) + .05)) ) )
It should be noted that various GIS software handles this type of activity in different ways. It could be a good idea to consult your program documentation or the support staff for the best method for your specific situation.
Please let me know if you have any more questions or if something is unclear.
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Dear All,
I have district shape files (polygons) and Demographic and Health Survey (DHS) cluster points (point shape file). I want to know how many point shape files lie in each district? anyone who could guide me how to do it in ArcGIS or in Rstudo? The screen shot is attached herewith. Thanks
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You have to apply a Spatial join between the two features
check out this link and you'll fin how.
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Our undergraduate team is trying to correlate Land Surface Temperature (LST) to morbidity rates of Leptospirosis in Manila, Philippines. We are using Climate Engine (https://app.climateengine.com/climateEngine) as our source of data, but available LST data points vary wildly each year. How can we get appropriate yearly averages for land surface temperature? Your help will very much be appreciated.
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Average Yearly Land Surface Temperature (LST) can be computed using Climate Engine by selecting the “LST” metric in the “Metrics” drop-down menu and then selecting the desired time period in the “Time Range” field. Once the desired parameters are selected, click the “Go” button to view the data. The resulting chart will display the average LST for the selected time period.
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I am looking for an algorithm or GIS software that, for a solar panel or a larger area equipped with solar panels, determines which buildings in the vicinity are blinded by the panels due to the reflection of sunlight.
Inputs are 3D planar polygons that describe the panel geometries. Furthermore, a surface model of the earth's surface. The algorithm's output would be the locations that are affected by the glare effects.
Who knows algorithmic approaches or software solutions?
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Michael John Patrick Sir, There is no particular 3D GIS software that can do this. However, some software packages such as Autodesk 3ds Max and Unreal Engine by Epic Games have capabilities to render lighting and reflections accurately. You can also try Computer Generated Architectural (CGA) Rule method for 3D GIS.
For projects within the scope of FAA review, a glare analysis is typically required. A glare analysis involves a visual simulation of the array’s impact on the visibility of nearby aircraft pilots. The analysis includes a 3D model of the array and its location, as well as a representation of the surrounding terrain. The analysis should also account for the angle of the sun, which changes throughout the day and year, and other factors such as the reflectivity of the array’s materials.
Some states and local governments are also beginning to require a glare analysis to be conducted as part of the permitting process. While the exact requirements may vary, they generally involve a 3D model of the array and its location, a measure of the maximum uplight generated by the array, and an analysis of the maximum brightness of the array at certain angles, both on an annual basis and at specific times of day.
A glare analysis is often conducted with a computer simulation program, such as RhinoGlare or Radiance, to create a visual representation of the array’s effects on the surrounding environment. However, it is important to note that the results of the analysis are only as good as the input data. Therefore, it is important to ensure that the model is as accurate as possible, including all relevant features such as topography and nearby buildings.
The results of the analysis are typically presented in the form of a report and visual representation of the array’s impact on the surrounding environment. This report can then be used to inform the decision-making process when it comes to the proposed solar project.
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I am currently doing an undergrad dissertation where I am measuring habitat fragmentation in Borneo from oil palm plantations (1973-2014). So far I have made my two landcover maps using Landsat imagery (1973 - MSS and 2014 - 8) which was then classified using an ISODATA algorithm. The result is two raster classified raster images with varying class sizes in both e.g. the amount of pixels for the forest class in 2014 is less than in 2014 due to landcover change.
Essentially to quantify fragmentation I need to measure certain metrics and so far I have been able to work out 'Class size area (ha)' and 'Percentage of landscape (%)'. I still need to work out:
  1. Number of patches (although I don't think this will work unless it is converted to vector)
  2. Patch size area (ha) (again I think it needs to be converted to vector)
  3. Total edge (m) (I know in vector format this would be by measuring the circumference I think?)
  4. Euclidean nearest neighbour (m) - this measures degree of adjacency of cells
I am by no means an expert so these are the metrics I thought would be most appropriate. If there are others I would like to know! Also just to add I have tried using FRAGSTATS but whenever I go to generate the statistics the software crashes and closes down unexpectedly.
I have also tried to download PatchAnalyst for ArcGIS but again had limited success.... Any help would be greatly appreciated.
Kind regards,
Connor.
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Hi Connor,
you can directly use your classified images (select the input dataset type as ERDAS Imagine grid, i.e., .img file format) and then select the relevant metrics (refer to the Fragstats User guide for a better understanding of each metrics) and run the model. Final outcome can be further analyzed in ArcGIS platform if you check the Generate Patch ID file under the Sampling Strategy.
I hope this helps.
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In theory clasees, we all have learnt about drainage density (DD), which is the ratio of 'total length of stream network in a basin (L)' to the 'basin area(A)'. However, when, we are trying to determine DD of some Indian river basins using Arc-GIS, we are facing some confusions. For instance,
1. We have to define some particular break value in Arc-GIS to get streams of differnt orders. Lesser the break value, higher is the stream order, therefore resulting in a higher value of L, and vice versa. For example, when we set the breakvalue as 500 for a particular basin, we are obatining a stream order upto 7, but if we increase the break value to 1500, the max. stream order reduces to 5 - automatically the L value also reduces. Thus, the same baisn may yeild two differnt DD values, under two aforesaid considertions of break values.
2. We also fixed the theoretically least possible break value , i.e., >0 and obtained a extremely dense stream network with high DD value.
So, my question is, what should be the threshold break value for a particular basin in order to get the DD?
3. From literature, we found that, there are five classes of DD with the following value ranges (km/km2), i.e., very coarse (<2), coarse (2-4), moderate (4-6), fine (6-8), and very fine (>8). However, for 20 river basins across differnt parts of India, we obtained DD values ranging between 1.03 to 1.29, which makes all those basins fall under very coarse category. But, from our visual inspection (one sample bain attached below), it seems to be very less to us.
We want some justification/ clarification/ comment on it.
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Dear Victor Hugo Burgos, I completely agree with you. I guess overlapping the developed stream network with some base map (e.g. google terrain map) might serve the purpose to identify where the river begins. However, as we are dealing with rain-fed river basins, where most of the times, the lower order streams (1st or 2nd) are dry, it becomes bit difficult to identify them as stream from the base map. Nonetheless, its a very good suggestion, and thanks a lot for that.
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I'm looking to extract shorelines from satellite images. To find a suitable method I need to compare various methods of automatic shoreline extraction methodologies. If you have any suggestions please leave in reply...
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I don't know about this tool bit you could use Raster calculator to compute the indices.
A faster way would be to use R and the function tasseledCap from the RSToolbox library. Here is the link to the function: https://rdrr.io/cran/RStoolbox/man/tasseledCap.html
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Currently, I am studying a project about electric charge station location selection. I can't find a trial version of ArcGIS Pro for Mac and I don't know if ArcGIS online has the capability to conduct an MCDA project. Is there anybody who has an experience with MCDA with ArcGIS online or can you suggest me a free tool for this problem?
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I'd stick with QGIS as it is 100% free. There are examples on Google about MCDA using QGIS, for example: (https://gis.stackexchange.com/questions/25976/performing-multicriteria-analysis-using-qgis). Generally speaking, it's a good practice to work with raster layers when performing MCDA.
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I am geocoding addresses using the Geocoding API from Google Maps. However, geocoding problems appear when the address is based on a specific kilometric point from a certain road. This has also occurred using other geocoding systems like OSM (Nominatim) and ArcGIS Pro.
Is there any standardized way to make Google Maps find the specific location based on the kilometric points?
Thank you for your help!
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Thank you Jens Kleb ! I will take a look at what you've said.
Best regards
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Has anyone used ArcGIS for 'automatically' detecting lineaments from a high-resolution (5m) DEM?
I was wondering whether anyone was familiar with or knew of any published research papers which looked at automatically detecting lineaments use ArcGIS?
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Although it doesn't require just ArcMap, you could try to use the MHHC (https://doi.org/10.1016/j.cageo.2016.03.015). This method will require python and Geomatica.
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Dear Scholars,
Assume a mobile air pollution monitoring strategy using a network of sensors that move around the city, specifically a network of sensors that quantify PM2.5 at a height of 1.5 meters that lasts about 20 minutes. Clearly, using this strategy we would lose temporal resolution to gain spatial resolution.
If we would like to perform spatial interpolation to "fill" the empty spaces, what would you recommend? What do you think about it? What would be your approximations?
Regards
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Hi,
If you expect some local variation and then a non-stationary behavior of your data, probably Empirical Bayesian Kriging will be the one. This is assuming you have a lot of data non left-skewed and you can asumme Gaussian distribution.
In any case, I recommend you to carry out a Cross Validation with a study of RMSE and AMSE, as you can see in Pellicone (2019; 10.1080/17445647.2019.1673840) or in Ferreiro-Lera (2022; 10.1080/17445647.2022.2101949).
I hope I have been helpful.
All the best,
Giovanni.
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I am using a NetCDF image comprising 12 subNetCDF images of different duration, as shown in the Figure attached; I tried to average/separate by using every tool, software, and different source, such as the use of Origin as mentioned in this link https://www.youtube.com/watch?v=14-sLHOaaOg&ab_channel=OriginLabCorp. I have used the Make NetCDF raster file tool, which won't import the subNetCDF in batch. It uploaded the images one at a time. I have used ArcGIS supporting tools such as https://r-video-tutorial.blogspot.com/2016/07/time-averages-of-netcdf-files-from.htmland also used python and R codes, but I failed to separate the subNetCDF files. I am working on large datasets. Uploading one-by-one images of multiple parameters with multiple duration will make my work more crucial, typical, and time-consuming. My work requires the final image as a raster file. Please recommend some solution to deal with the issue. Please help me get images at one or an average of all images in one. My work requires the final image as a raster file.
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① add data .nc,Band Dimension(optional) is ‘time’
② “Export data”, to format TIFF (Location is a file, not gdb)
③Define Projection to WGS1984(for example)
④Add Tiff Data(after projection) and its all bands(Band1-Band12)
⑤Raster Calculator: calculate the sum or average of all bands and output grid or tiff
Just for reference.
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I have a vector layer with the determined polygons and a raster layer that is a cutout of a DEM with calculated aspects. I have tried to use "zonal statistics" in QGIS, but then it only calculates one mean aspect for each polygon and most of the polygons then get a mean southern slope.
The reason I want to have the proportion is to evaluate how much of the area in a polygon is suitable for an alpine species according to northern slopes being preferably unsuitable with longer snow coverage etc.
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Hey Oscar!
Maybe the solution is to recclasify the slopes (I mean to change real values of slope raster to the new values, i.e. north = 1, and south, east, west = 0). Next - just calculate polygon areas and north slopes areas. You van try it!
All the best!
Bartek
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Dear All,
I am doing demographic and health survey (DHS) cluster base analysis. I created buffers of 20k, 10km, 5km and 2km around the DHS clusters. Now i want to extract/calculate total number of cells/pixels fall in each buffer mentioned above. How i can do this in ArcGIS/ArcMap). I already use zonal statistics as table tool of arcgis but count in that table does not match across various buffers. For example count in 20km is 17 while count in 5 km is 250 which seems wrong logically.
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you can do one thing create a fish net using Create Fishnet tool in Arcmap by specifying the pixel size while doing that, mark the "create the label point" option, which will give a point for each pixel. Then use intersect command mentioned in Geoprocessing to extract the fishnet for each study area. Here you can add a Serial number by editing labels in Properties. That will give a total pixel in your study area. I hope this method will help you
Thank you
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I'm running some species distribution models for seagrass in the Hebrides, and one of the factors I need to include is a raster of exposure (to wind and waves). So far I've found three methods:
  • USGS' Wind Fetch and Wave Model ArcGIS Tools
  • NCCOS' Wave Exposure Model (WEMo)
  • Delft University's Simulating Waves Nearshore (SWaN) model
Of these, WEMo looked the most promising - using it to model seagrass is explicitly stated as a potential use, but I can't open it as it says I have to bind it to ArcGIS (nothing about this in the manual or online so stuck). SWaN looks interesting, but is far too complex for me and even with the manual I don't really know where/how to start.
So, I'm using the USGS ArcGIS tools, which are easy enough to use. Still, I thought I might as well ask if anyone knows of a better model/software which is relatively user friendly?
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Hey Alex Wickenden did you even get an answer to this? I'm also looking for a good wind-wave model and am having trouble "binding" WeMO" to ArcGIS 10 (ArcMap 9.3 is retired).
What did you end up using? How did it go?
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Hi
I am looking for a tool that finds Stream Knickpoints (i.e. identify significative slope change in a reach). I need this to properly segment streams for water quality simulations. I found that the KET tool for ArcGIS would do that task (http://topography.csis.u-tokyo.ac.jp/resources/tools_ket/index.html) but it presents errors when I applied their tutorial examples and it seems to be no longer available.
Other options that I found (LSDTopoTools) require Linux.
I don´t know if there is a QGIS plugin for this or a piece of code that help me with these. I would prefer an option that still works in Windows.
Do you have some suggestions? I would appreciate any thoughts.
Thank you
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Could someone provide me with a guide/suggestion/paper on how to generate/calculate the relief map of a region from DEM at a given distance (km) (i.e., radius in km)? The radius could be any value of choice. I desire to understand the spatial variation of relief in the region.
PS: Not the traditional hillshade map from ArcGIS/QGIS.
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Thank you Prof. Gbenga Olayanju for your suggestions.
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When I was working on entering an equation using Raster Calculator in ArcGIS, and after the execution request, the above error appeared.
Is there anyone who can help me find a solution to this error?
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Dear friends
I do have two issues relating to the custom coordinate system in ArcGIS 10.3.
1) When I create a custom coordinate system, it should be saved in some location. How can I locate that transformation I created?
2) Another issue that when I cannot select and apply the custom coordinate system in the project window (under data management tool>> projection and transformation) and, instead, it appears with another transformation system which I do not know.
I would be grateful if anyone suggest a solution to this (small) issue that hindered my project.
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Dear all,
I am going to derive the precipitation data from NETCDF files of CMIP5 GCMs in order to  forecast precipitation after doing Bias Correction with Quantile Mapping as a downscaling method. In the literature that some of the bests are attached, the nearest neighborhood and Inverse Distance Method are highly recommended.
The nearest neighbour give the average value of the grid to each point located in the grid as a simple method. According to the attached paper (drought-assessment-based-on-m...) the author claimed that the NN method is better than other methods such as IDM because:
"The major reason is that we intended to preserve the
original climate signal of the GCMs even though the large grid spacing.
Involving more GCM grid cell data on the interpolation procedure
(as in Inverse Distance Weighting–IDW) may result to significant
information dilution, or signal cancellation between two or more grid
cell data from GCM outputs."
But in my opinion maybe the IDM is a better choice because I think as the estimates of subgrid-scale values are generally not provided and the other attached paper (1-s2.0-S00221...) is a good instance for its efficiency.
I would appreciate if someone can answer this question with an evidence. Which interpolation method do you recommend for interpolation of GCM cmip5 outputs?
Thank you in advance.
Yours,
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Can you please refer to the tools and codes used in regridding?
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We have aerial survey photos taken by a drone. Images are already in GPS - raster format. I would like to analyze (locate and count) structures - specific bird nests in reedbeds. Which would be the best software to do this, either self standing or ArcGIS/QGIS add-on. It would be some kind of software for shape recognition by machine learning.
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Check the module "Feature Extraction" by ENVI
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I have generated a Curvature map in ArcGIS, what exactly is the unit of measure of Curvature generated in ArcGIS?
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Degree of curvature?
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Planning to use a handy and affordable GPS receiver along with ArcGIS Field Maps for data collection.
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Thank you, Dr. Fareed. I checked their website and found Trimble Catalyst/DA2 with GNSS and Bluetooth option.
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I am new to ArcGIS. Could anyone give me a guide line about how to calculate hypsographic (drainage mean) elevation of streams? So far, I have DEM raster, stream shpfile, and drainage basin shpfile set up. 
Thank you!
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hello sir
how to calculate mean elevation draianage basins? I know the maximum and minimum elevation, but how to calculate the mean elevation
for example;
max elevation=2500 minimum elevation =250
mean elevation = ?
📷
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I implemented the hotspot analysis using ArcGIS which relies on the Getis-Ord Gi* statistics. Based on the information reported on the corresponding ESRI webpage, even if data are clustered the presence of one feature showing a high or low z-score value do not indicates the presence of a significant hot or coldspot. In fact, to be considered as a statistically significant spot, a feature must have a high/low value and be surrounded by other features presenting high/low values as well.
However, what is the exact number of features required to define the presence of an hot or coldspot? two, three, four, etc.? or simply more than one?
Thanks in advance.
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Sure!
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Need to compare and contrast the image analysis capabilities and potential of ArcGIS and ERDAS software. Please explain or recommend useful litetature.
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I have same doubt
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I would like to know if ArcGIS could be used to spatial model microplastics in water bodies and if yes, I wish to get any research work done in that area
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Thank you. Please I have 24 points ( 3 sampling points per stratum for an 8 strata area) of a lake. Can that be worked on using the GIS, if yes, how do I go about it?
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I need to make a clustering and hot spots of Covid-19 positive cases using ArcGIS. Please help
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Hi,
You could use the the Getis-Ord local statistic in ArcGIS for that. See:
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Hey,
I am trying to georeference an image from google earth using arcGIS. for some reason the anchoring does not come out accurate. I tried changing the angle on GE to be in zenith while acquiring the image and made sure I'm using the correct projection on arcGIS and my residuals are still vary high. any idea how I can improve my accuracy?
thanks !
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INRE: Control points. ... I have insufficient information to make that call, like which order of polynomial you are using, or the extent and distribution of your entire network of control points ( i.e. if they extend past the edge of your area of interest ). If you concern is the coast, those seem like a pretty good set.
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There is no HSG column in the attribute table . So from where could I drive the HSG please?
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You need a soil map to be integrated with the LULC map. And you have to add the HSG column in the attribute table.
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Hi everyone,
I would like to create new raster files:
1) Euclidean distance to coastline
2) compound topographic index
3) elevation and
4) local deviation from global
from ETOPO1 data.
I have a bit of an idea that I can do this in ArcGIS. But can I do this using QGIS or R? (or any opensource alternatives).
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Hi...
QSWAT, a QGIS Interface for SWAT has been developed by Dr. Chris George and made available with documentation and example datasets (developed by Dr. Yihun Dile) on the SWAT website. This free and open-source software will be used extensively in SWAT training, especially in developing countries where the use of commercial GIS software is cost-prohibitive. For more information, see the SWAT website or contact Dr. George or Dr. Srinivasan (r-srinivasan@tamu.edu).
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When applying supervised classification in ArcGIS Pro 2.8.4 the whole image becomes as one class as shown in the video below:
Does anyone know why this issue occur?
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Thanks for answering. However, in the video you shared everything worked as expected. In my video on the other hand, it didn't for some reason.
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Hi, everyone. I am facing a problem with using the Extract by mask tool. When I apply it to a mosaiced image, the output image has strange colours ( in the attachment).
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  1. Right-click the colormap image > Properties > Symbology tab. Change the symbology to Unique Values. The same colors that were represented by the colormap are now represented by unique values. Click OK.
  2. Right-click the colormap image > Save As Layer File.
  3. Perform the Extract by Mask on the colormap image.
  4. The output raster is grayscale with stretched symbology. Right-click the new Output Raster > Properties > Symbology tab. Select Unique Values and click Import.
  5. Browse to and select the layer file created previously. The colors are updated accordingly.
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Dears members, I am working on shoreline delineation using landsat 8 OLI,
Could you please provide me a link to download the tasseled cap with landsat for arcgis .tbx extension for arcgis 10.5.
Secondly how to extract the shoreline boundary from landsat 8 images using arcgis 10.5
Thanks in advance
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The tool works on landsat 7 ETM + and Landsat 5
For L8 OLI you have to manually calculate Brightness, greenness, wetness and NDVI then use tasseled cap function
Here's the link for it
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Couldn't find it on arcgis online and neither on govt. backed gis service websites.
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Hi,
Can any of you please share me Landsat tool box for ArcGIS 10.1 to fix scan line errors in landsat images?
Thanks.
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Please am in need of the landsat toolbox for Arcmap 10.3. Thanks
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Are these datasets available through spatial analysis tools like ArcGIS? Are they available in libraries of programming tools like R or Python? Are they available at official websites from the Colombian government? Any reference to the specific links or libraries is highly appreciated.
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Hi
Please guide how to create drainage density map of a watershed?
I followed arcgis tutorials from YouTube but it gives a single value for whole catchment.
I need to prepare a map showing different classes
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Michael John Patrick please see the attached screenshots.
I want to get results as shown in the attached image DD_paper.
This is Swat watershed.
I am following the paper to cross check my results but mine are different as in attached drain_density image.
I am not able to get the issue.
Please guide
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I want to classify my raster file into several classes in ArcGIS . When I click "Classified" in Symbology, ArcGIS stated that "the Classified renderer requires the data to have a histogram. Do you want to compute the histogram"? What does it mean when ArcGIS want to compute the histogram?
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Muhammad Firdaus Histogram contrast enhancement allows you to tailor your contrast stretch by altering the histogram interactively.
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I want to make a map that consists of nodes and links in GIS(if in QGIS it'll be better but ArcGIS is also ok).
The information that I only have is this csv file, that contains the link object ID, coordinates of two points of each link, and the uclidean length. You can ignore 'connectivity' tab.
In this situation, can I make the map? If so, how can I? Please please help me :(
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see attached file for solution
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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 would like to calculate average field size of agricultural fields in the landscapes surrounding my study sites. Calculating field size in ArcGis Pro is easy enough, but when intersecting my landscape buffers with the field layer and then calculating average field size based on the intersected layer, some of my fields are cut off and "made smaller", which will underestimate average field size.
Any ideas on how to deal with this issue? Are there tools in ArcGIS Pro (or anopther programm) that account for/deal with this bias?
I very much appreciate your ideas and suggestions!
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Hadrien Dicostanzo That is what I did so far, calculate the mean based on the new intersected layer, but it cuts off some fields at the edge (where they intersect with the buffer) and reduces average field size.
Thanks for the suggested approach, that may be a nice way of deciding which filed to include in the calculation
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Good morning everyone!
I am using the Location-Allocation tool on ArcGIS Pro to locate some biomethane plants in Italy. I followed the tutorial provided by the software but I have some doubts.
At what stage of the analysis should I indicate to the software the layer with the road network?
Is it really necessary to load the road network? Or you can use the road network of the base map?
Thanks a lot to those who can help me.
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Thank you for your suggestions.
I will follow the steps of the tutorial you linked.
Thank you for your time!
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I am interested in landscape metrics analysis of LULC maps using Fragstats for each grids created using the Create Fishnet tool in ArcGIS 10.2. But I am confused about input data for the whole study and the procedures
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Dear All, I have computed the zonal statistics as table using ArcGIS software, the output is attached. I want t know how i can categoriz the digital number. Actually i need the DN value for each district. The output i attached here shows only the sum of the DN but i need to know how many pixels are there in each district and what is the value of pixels in each district. I want to make three catagories of DN i.e. DN between 0 and 10, DN between 11 and 30 and DN greater than 30. Any one who can explain how i can do that. Looking forward to read from you soon. Thanks in advance
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INRE: "how many pixels are there in each district" - seems you want a count.
So make a constant raster with all 'ones' in the cells - 'onesraster':
The sum of cells in each zone will be a count/spatial-analyst-toolbox/create-constant-raster.htm
OutRaster = ZonalStatistics( ZoneRaster, "VALUE", onesraster, "SUM")
Each cell of the OutRaster will be the sum of cells for each of the zones.
This might be useful if you're trying to obtain the average value of the
ZonalGeometry can also give you the area.
Also Zonal Geometry as Table and Zonal Statistics as Table
Ref:
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For comparison with other dataset, I'm calculating the LS factor using the following formula in ArcGIS:
(1) LS = Power(“flow accumulation”*[cell resolution]/22.1,0.4)*Power(Sin(“slope of degree”*0.01745))/0.09, 1.4)*1.4
but I was not able to find the theoretical formulation of LS it corresponds, I've got the feeling that (1) is the ArcGIS correspective of
(2) LS = (m+1) [ (U/22.13)]^m [sin(slope)/sin(5°)]^n
where U is the unitary upslope contributing area and (2) should be LS factor according to Mitasova et al. (1996) paper.
The following document
seems to support my feelings but in absence of references for (1) in literature I'm not completely sure that (1) and (2) are the "same" formula.
Mitasova H., Hofierka, J., Zlocha, M. & Iverson, L.R. (1996) Modeling topographic potential for erosion and deposition using GIS. International Journal of Geographical Information Science. 10 (5), 629-641.
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I have line and point data with elevation, & i need to draw a profile for every 2 km of length of the pipe. Theme is to automate the profile (graph) as the data frame moves forwards? Template is:
1st Frame: Upper Portion (will have a basemap with vector data)
&
2nd Frame: Lower Portion (will the bar chart for the above shown terrain)
Using ArcGIS v 10.8.
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In my last working. I saved the profiles in .jpg format for each cross-section and the data driven started changing .jpg files itself, after saving the path of each .jpg file in the attribute table.
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Hi, I have approx. 300 radiometric thermal images. I used a DJI's Mavic 2 Enterprise Advanced UAV. I was able to get an orthophoto using the visual light images but I cannot get an orthophoto using the thermal images. I try using Agisoft Metashape Pro, ArcGIS Pro, and WebODM. Any recommendation? A video tutorial or paper will be greatly appreciated. Happy holidays!
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I know this is weird but I'm going to answer my own question:
It is possible to produce thermal orthomosaics using the radiometric thermal images collected using the M2EA UAV. This can be done by using Agisoft Metashape Pro. I have tried other options, such as WebODM, ArcGIS Pro and ReCap Pro, they all were useless, so don't waste your time using them.
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Hello! I've recently come across the need to reproject some environmental raster layers from the mercator projection into an area-conserving projection: cylindrical equal area.
Reprojecting in R using the projectRaster function, then writing the rasters as tif files, I'm getting files that are significantly large so that I quickly run off of usable computer space in my analysis (I have approximately 50 environmental rasters).
My question is: is there a way to avoid this significant file size increase? It could be either through saving the reprojected raster in another format that is more lightweight; another equal area projection that through reprojection from mercator leads to lesser distortion/size increase;
Thank you in advance for any input!
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Francisco O. Borges If your originals are already classified, or remote sensing images not RGB photos, the interpolation technique matters - should be 'nearest neighbor', or you will get values that are essentially noise. For instance https://www.mrlc.gov/data/legends/national-land-cover-database-class-legend-and-description , values of 31 Barren Land (Rock/Sand/Clay) and 41 Deciduous Forest would be interpolated to some nonsense value of between 31 and 45. Similar effects occur for signatures can occur if you are relying on the relative values between bands for NDVI, for instance.
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Query on research tool
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Dear collegue .
Arc hydro in Arc GIS will be morehelpfull tool for your task.
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My supervisor told me that there are some ways to extract data using a programming language. I would greatly appreciate it if someone can guide me a little on this.
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You can use terra package from R to extract the data. https://github.com/rspatial/terra
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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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I wanted to get the TOA reflectance from MODIS data (Terra surface reflectance, MOD09A1). hence I used preprocessing too. I got the following reflectance values which I suppose are very less than I expected. There are so many zeros after the decimal. Would you please help me to solve this?
(As I was having a problem downloading the data. So I prefer to use this preprocess tool to use the data downloaded directly from the official website.)
Thank you in advance.
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Numerous papers talk about creating latilong or lat/long blocks of 1 degree or 2 degrees. Is there a way to do this in ArcGIS? We have nest location data for three species of shorebirds in six states of the US, as well as the location and data for all the weather stations in those six states. We would like to find average temperature during the breeding season in those six states and see if changes in average temperature are correlated with changes in clutch initiation date in the shorebird species. One way we can do this (according to previous studies) is to create latilong blocks and use the data from the weather stations in those blocks where our nests are located. However, we are unfamiliar with how to do this in ArcGIS or if there is another way to do it. Any suggestions are much appreciated!
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Thank you everyone! I will look into these suggestions! I really appreciate your help!
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I am working on future climate projections. I need to extract CORDEX data at specific rainfall and temperature stations. The option "MakeNetcdf to table view" in Arc GIS is not showing results after I execute the operation. Can anyone guide me?
Thank you
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NetCDF to rastet tool of ArcMap will be useful for this analysis.
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I need to create a raster that indexes fragmentation across a large landscape for use in a habitat suitability model.
I used fragstats a long time ago. Is this this still the best way to go. I have access to ArcMap and ArcGIS Pro. for simplicity, something that integrates into these platforms would be ideal.
Thanks for your suggestions
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Well, you can use raster calculator to map the fragmented index value in an area of interest.
Before doing that, you may need to reclassify your final modeled raster into specific classes depending upon what level of zones you would want to create.
Arc GIS is simpler to use. You can layers of reclassified rasters and then do tha above analysis
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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 want the DEM rendering effect shown in the picture below, but the hillshade made in ArcGIS is not the one shown in the picture. May I ask if you have detailed production process and parameter setting, please let me know, thank you very much.
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Hey!
Sometimes very well results give applying not only transparent hillshade, but additionaly transparent slope map. If You make such compilation - the effects may surprise you sometimes, see below :-)
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I am getting an error: "no features found. possibly an empty feature class." while delineating watershed in SWAT from DEM. I am using ARCGIS 10.1 and ARCSWAT version 2012 .
Sometimes the error occur as :
" the watershed with grid code does not have an outlet within it . This is  likely because the outlet falls on an edge of the watershed boundary."  for the same process...
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Please, apply hydrology tools of ArcGIS to delineate the watershed boundary.
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I am using MODIS surface reflectance product MOD09A1. I prefer using ArcGIS and ERDAS IMAGINE softwares.
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Hi Dewan,
You can find the products and the processing chains for both MODIS platforms at the following site.
It's technical stuff, and hence takes time to become a pro in this area of RS image processing
Cheers,
Frank
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Hi,
Greetings! Please share with me if you know of any AHP extensions for ArcGIS 10.5. There is one (https://www.arcgis.com/home/item.html?id=bb3521d775c94b28b69a10cd184b7c1f), but it works only for ArcGIS 10.1 and 10.2. Any help in this matter is highly appreciated.
Kind regards
Sohel
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The location of DAM has been obtained by using AHP techniques. As a result, I have prepared the dam/reservoir suitability map. Certainly, validation is a very important part of the model. If, any other dam site is not available/ not constructed in the study area. How can we validate? Is there any method or approach?. Furthermore, Is sensitivity analysis is required for the spatial layers utilized to prepare the dam site suitability map?
I m eagerly waiting for prompt and scientific answers to overcome this difficulty?
Thanks
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Multi-Criteria Decision-Making (MCDM, also known as Multi-Criteria Decision Analysis, MCDA) refers to methods – including software – for making decisions where numerous criteria (or objectives) must be addressed concurrently in order to rank or choose between the options under consideration.
A Multi-Criteria Analysis (MCA) may be used to find and analyze policy choices by evaluating their effects, performance, impacts, and trade-offs. MCA is a systematic strategy for guiding complicated decisions based on predefined criteria and objectives.
However, Zardari et al. (2015) defined three key types of MCDM techniques, which are articulated in the form of an up-to-date classification Arslan (2017) as simple, original, and differentiated methods. Because of its simplicity and broad general application, the WSM is chosen as the best MCDM approach.
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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 a global above-ground biomass raster dataset from which I will subset a certain area of southeast Asia. I tried to use GEDI data but couldn't work out how to use this dataset. Is there any other data set that will serve this purpose? or can you point out how can I use GEDI AGB data?
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GEDI aboveground biomass density footprints (GEDI L4A) one year data can be searched and downloaded using python (codehttps://github.com/ornldaac/gedi_tutorials/blob/main/2_gedi_l4a_subsets.ipynb) in jupyter notebook. Then, you can export these footprints in GeoJSON or shapefile format which can be easily analysed and convert into raster in ArcGIS or QGIS. This data is discrete and sparsely distributed so you have to apply any predictive modelling approach like machine learning for the generation of continuous AGB map.
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I want to calculate the distance between points and lines in ArcGIS. I need to use the parameter of gravitation direction. I need to compute the direction from the center of the forest plot to the nearest road, but it is important for me to give weight on the direction of gravitation.
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The Near tool has an option for providing the direction in addition to the distance and can be run on points going to lines. Once you have the distance and direction you can combine them in whatever weighting scheme you like. There is also a paper that describes an existing Gravity Model tool for ArcGIS -
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I am running Geographically Weighted Regression (GWR) on a categorical dependent variable so my model is basically a Geographically Weighted Logistic Regression.
I have multiple independent variables, some numerical and some categorical.
While interpreting the results of numerical variables is straight forward, I want to know how to distinguish the reference level of the categorical independent variables and how to interpret those?
let's say I code males as 0 and females as 1. so the coefficients should be interpreted for females as they are coded 1? what if I coded males as1 and females as 2?
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Dear Nasser,
There should be no difference in the results if you coded (0,1) or (1,2)
In both cases, the result will be as a ratio between them. The parameter B equals the ratio of males/females (as males variable is coded with the smaller value)
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Presently, QGIS is also being used widely in various GIS projects, still companies are looking for experts in ArcGIS. Can we expect that this scenario will persists?
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QGIS is the most preferable because it is free and open source.
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Reword the actual sentence.
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@Afrooz Alimohamadi,
I think you are looking for this?
"Since these membership functions are specific to continuous input data, when you want to use categorical data for input to your Fuzzy Overlay analysis, you need to transform the data to the 0 to 1 possibility of membership scale using any number of Spatial Analyst tools. The two tools that are most useful for this process are Reclassify and Divide. The Reclassify tool allows you to transform your categorical data to a 0 to 10 scale (you cannot reclassify the data directly to the 0 to 1 scale with the tool), then divide the resulting transformed data by 10 to obtain the 0 to 1 scale."