Questions related to Cartography
I was doing some research, and I have read somewhere on the internet that is not recommended to use homogeneous range of values for color progression between classes (eg., 20%, 40% 60% 80%, 100%) when we are using "value" as visual variable in cartography.
Than, I assumed there might be some "rules" to define a good color progression!
For example: "Black 0, Black 10, Black 30, Black 60 and Black 100" which corresponds to a variation of 10% between the second and first class, 20% between the third and second class, 30% between the fourth and third class and 40% between the fifth and fourth class.
I would like to kindly receive your opinion/feedback about this topic.
Thank you in advanced..
Please, what would be the optimal solution for charging for creating a topographic map? The specific problem is related to the different relations between land and sea, that is, the amount of content is not the same on all sheets. Are there any specific models for charging cartographic products according to the amount of data or the time spent on creation?
Say I have a satellite image of known dimensions. I also know the size of each pixel. The coordinates of some pixels are given to me, but not all. How can I calculate the coordinates for each pixel, using the known coordinates?
I have a bachelor's degree in topographic engineering and a master’s degree in remote sensing and geographic information systems, and I am looking for a title for a PhD research related to cartography or one of the modern applications of geographic information systems.
Such question is raised when we want to know the future development of research paradigms in educational and social research after we endeavor to compare and evaluate them. I have pondered such question for 18 years. I would like to see if you could join me to answer such epistemologica and ontological l question.....Recently, I have found a feasible method called social cartography. .....
Hello, for an article I am looking for maps of the Crimean peninsula (ideally textbooks or atlases) from Russia and Ukraine to compare. Does anyone have appropriate materials or know of suitable contacts (textbook publishers or universities)? Best regards.
I often come across those two fascinating terms (rather associated with the disciplines of geography, geology?) in titles of papers on literature and literary criticism. Although I often read those papers with interest and enthusiasm, the difference between the two terms which are commonly used with prepositional phrases as in "topography of desire", "cartography of love and loss", "topography of pain.." etc. remains blurred to me.
What would make you (or any researcher, writer interested in literary criticism) choose one over the other? Or, when would you opt for 'cartography' rather than 'topography', for instance? Your decision, would be based on what?
Thank you all!
I am characterising a volcanic deposit in which I am currently imaging at SEM the fine ash (>4 phi). For each sample I do a 500um-wide elementary cartography. I know that by superposing filter you can know which component are present but for the proportion I am worried since here I would have a ratio of surfaces and not of weight (As I have for bigger fractions between -7.0 and -0.5 phi).
Should I multiply the surface area of each component by it's density (using densities of the various components) assuming EVERY component is 1 um thick (which it is the worring assumption for me) ? This last assumption allow me to transform a surface to a volume and then to end up with a mass and not a mass.m-1.
Thank you in advance !
Aim is to find signal value at x0 from signal values at xi, i=1,..N using Kriging, given as Z(x0)=sum(wi Z(xi)).
After fitting a non-decreasing curve to empirical variogram, we solve following equation to find the weights wi's-
Aw = B,
where A is padded matrix containing Cov(xi,xj) terms and B is vector containing Cov(xi,x0).
In my simulation setup, weights often have negative value (which is non-intuitive). Am I missing any step? As per my understanding, choice of curve-fitting function affects A. Weights are positive only if A is positive-definite. Is there a way to ensure that A is positive-definite?
As an electoral geographer I often present various electoral maps. I would like to create some contiguous cartograms in ArcGIS software but I have problems to find any geoprocessing tool that will work. If you have any advice for me I would be very greatful.
Thank you for your answers.
Maps are seemingly produced in ever-increasing numbers without principles of sound cartographic design. For example, despite the publication of successive cartographic texts and blogs that advise against the use of absolute numbers for choropleth maps, the practice is widespread in mapping cases of COVID-19. How can we ensure that cartographic design theory is implemented more widely?
I have built predictive models with the Random Forest algorithm. Now I want to create predictive cartography with these models. I have read about the R package "ModelMap" but I suppose there are others.. I appreciate any kind of information about techniques, programs, etc ... (better if it is supported by bibliography). Thank you!
Is it time to re-examine the labelling of Africa's regions as North Africa and Sub-Saharan Africa? Should there not be a more modern term for the larger subdivision of Africa. One that communicates its larger land mass, population , historical, anthropological, genealogical and economical significance. While not sure of the origin, but sometimes these terms originate with cartographers or journalists and then persist in the language? We seem not to have persisted with labels such as Asia Minor and Asia Major (see map). On the other hand, in the Caribbean there is an historical division of the Antiles as Greater Antiles and Lesser Antiles. Is the label Sub-Saharan Africa still apprpriate? If not, what would you recommend the larger Africa be referenced as ? Greater Afica ? Africa Major ? Some other reference ?
I'm currently looking for data analysis program to conduct the stellar cartography/doppler imaging. Kindly, anyone provide me the tool to extrapolate for my on-going research?
Dear cartography fellows, are you please aware of any research articles on depiction of own-position on digital maps? I am trying to investigate how map users perceives and interprets the precision of own-position depiction in terms of location and direction.
Can someone recommend any articles which discusses problem of generalization of maps? When you change resoliution or aggregate several territories into 1 you lose some information of data. A lot of articles are about population density and generalization problems which occured during different analysis methods.
Does anyone know how to indicate a free reference on free geotechnology? Which conceptually encompasses all free geotechnologies?
What could be the role of cartography in Big data processing?
The increasing amount of data encourages the creation of new methodologies for data processing, as well as the development of digital technologies. Both are progressively yielding new potentials and possibilities in the evolution of cartographic analyses, synthesis, visualization, and their applications. This trend also leads to new challenges in cartography due to dealing with the gathering, storage, analysis, and visualization of spatial information and data. Cartography is one of the few visualization disciplines to has always used, and correctly analyzed a huge amount of data, and represented them on different levels of preciseness according to the needs of potential users. The bridge between Big Data (BD) and society cannot be achieved by only existing technologies and computers. The presence of professionals should be more active in the process of transforming BD into actionable information for users.
I wish to utilize cartosat DEM, publicly available form bhuvan site. However, I have analyzed and seen that the elevation values from cartosat DEM are very similar to ellipsoidal height of GLAS/ICEsat altimetry data. Before I use the DEM data, I wish to know whether the elevation values show actual orthometric height or ellipsoidal height?
I would like to create an online digital map guide of the urban, social and economic characteristics of an area with a significant historical heritage. I will be very grateful for your contributions in terms of ideas, proposals, bibliography, examples of feild sheets, operational modes, GIS online ...
I am new for Generic Mapping Tool (GMT), but I would like to work through a few simple examples of generating legends (ie. multiple points or lines plotted on a single figure using psxy). In the following example, I want a set the location of Legend in the southwest (Inside bottom-left of axes).
gmt psbasemap -R-108/-105/31/35 -JM6i -Ba0.5 -K -P> New_Mexico.ps
gmt pscoast -R -J -Df -Gwhite -O -K -P>> New_Mexico.ps
gmt psxy Data1.txt -R -J -Sc0.5c -Gblue -O -K -P >>New_Mexico.ps
gmt psxy Data2.txt -R -J -St0.5c -Gred -O -K -P>>New_Mexico.ps
gmt psxy Data3.txt -R -J -Ss0.5c -Ggreen -O -K -P>>New_Mexico.ps
Dear colleagues! Would you kindly name books or maybe articles on the history of the cartography of the British Empire and / or spatial perceptions in it? How the British created maps of their colonies and conceived space as such. Of course, I know these two books: Edney M.H. "Mapping an Empire: The Geographical Construction of British India, 1765 - 1843" and "The Imperial Map: Cartography and the Mastery of Empire" (ed. by J.R. Akerman). Are there others of the same high quality? :)
Maps tend to be judged according to how good they look rather than how well they function.
Can form ever follow function in cartography?
Suppose you have a set of point data which contains two variables (say var1 and var2), both of which have discrete values (say 1, 2, and 3). You try to map them (see attached files var1.jpeg and var2.jpeg for reference) and decide you want to see how similar these two data are in terms of statistics. You create a "matrix" comparing the values of the two variables (see sim.jpg) and obtain a %similarity by taking the percentage of the total count of all points which had the same value for both variables (e.g. var1 and var2 = 1, etc.) in relation to the total number of points.
Is that the only way to compare the two variables? What other methods can be performed to compare these two?
P.S.: Scatter plots are ineffective, since they only result in a set of 9 visible points (because the data is discrete, the only possible values for each axis is 1, 2 and 3, resulting in only 9 possible combinations of ordered pairs) (see scatter.jpg). Q-Q plots only show 5 points (see qq.jpg).
Thank you very much!
I am trying to get morphometric data on Ouachita map turtles from a particular river system and going from website to website is inefficient if there is a one-stop-shopping alternative online.
Kindly someone to help,how i can use fabric tool in ArcMap to subdivide a parcel of land into equal portions of equal known area. if i just have the polygon of the bounbary of the area of study..
Kindly step by step from scratch.see the image below of how i want to divide it
I have OSM data of the streets but, some of the features have missing names which could be seen on google map. Thank you for your kind attention.
Need a common projection for yamuna river shapefiles covering himalayas and plains of uttarakhand,uttar pradesh.
We are developing a server with historical maps and aerial photographs of San Escobar https://twitter.com/rpdsanescobar?lang=en https://www.facebook.com/sanescobarcountry/ Amount of data is relatively small (~12 TB), as the country is still young, but is going to increase soon. What would be better choice to store and edit such data (aerial images in raster format and maps in raster or vector): RAID 10 or RAID 5? From practical point of view: is the RAID 5 performing noticeably worse than RAID 10?
I have a point shapefile representing the location of weather stations; for each point, the wind speed and wind direction (in degrees) is recorded. I need to create a cotninous surface (i.e., a raster) representing the wind direction in a given area.
In order to do that, I would like to follow the procedure described by:
Safadi, C., 2016. Wind and wave modelling for the evaluation of the maritime accessibility and protection afforded by ancient harbours, Journal of Archaeological Science: Reports 5, 348–60.
which in turn relies on:
Williams, R., 1999. Non-linear surface interpolations: which way is the wind blowing? Paper presented at the ESRI Conference Proceedings, 1999 (which can be found at the link provided below).
The procedure, which I do not totally grasp (as I will elaborate on in what follows), is graphically synthesized by Safadi in the attached image.
I understand that:
(1) the wind direction is first split into two components, using the sine and cosine of the wind direction, so obtaining two values indicated with X' and Y' in the attached image;
(2) the two components are interpolated, so obtaining two (separated) rasters;
(3) the two resulting rasters are used to calculate the alpha angle that, following the indications in the attached image, should be equal to TAN-1Y'/X'.
Now, what I do not follow is:
-in step (1) above, shall I take the sine and cosine of the wind direction only, or these must be multiplied by H (see the upper-left part of the attached image)?
-the last step of the procedure, the one that is indicated at point c of the attached image, is rather obscure to me.
Would anyone mind to clarify the above points, with possible reference to actual GIS (preferably, ArcGIS) procedures? Thank you for any guidance you will kindly provide.
I would like to make an analysis with QGIS with the tools such as geo-statistics, geo-referencing, and digitizing with this incomplete and rough sketches of the data. However, since the client does not have the proper information about the local coodinates, or any shape file that could contribute with the GIS, I have found out that by using Google Earth Pro, I could find a location which I am confident about that this would be the location in the sketch drawn by Mr. Mostafa El-Sayed, the surveying engineer, in the El Bahariya.
I need calculate fragmentation metrics from raster in an hidrografic basin. Someone knows a package from R for calculate: Number of fragments, total of fragments, distance of fragments and form of fragments?
I would like to apply Getis-Ord hotspot analysis on a tiff image of IHC but do not have the know-how in this area. I was hoping to collaborate with someone that has the expertise in this application who would be able to walk me through this analysis from start to finish.
I studied in detail files published by BTS about CTPP files. I found following subdivisions are used:
7-State-County-MPO Detailed Summary Level
9-State-County-Census Tract-Block Group
Also following units are used:
Traffic Analysis Zone ,Consolidated Metropolitan, Statistical Area-Primary ,Metropolitan Statistical Area Consolidated code.
What is the reason for these divisions as they could only consider for example only three types of units and subdivisions?
The problem happens after having the DEM, then I do the process of determining the slope and I get a new map in which the data do not correspond, it does not calculate it, then in percentage, because when I do it with grades, it only takes me two Ranges, one low and one high. For example I do not give the percentages, but very high values (0-7101609412, 7101609412-2485563294, etc.)
I have done it in ArcGis and QGIS, all the same happens, I have also used different types of DEM and nothing.
Thank you very much for the help you can give me.
I have the information of 150 companies in terms of their location (latitude and longitude) throughout the UK.
I would like to identify the location for the waste collection centre for all of them, so it requires all of them to be clustered/grouped which will minimise the total travel distance. Each cluster may have their own waste collection centre.
How this clustering can be done? Maybe companies in 50km radius in one group, etc? Anyone can help me on this?
I'm looking for shapefiles for all IBAs in Turkey, Armenia, Georgia, and Azerbaijan. I have contacted BirdLife with no response. Anyone have files to share or know of where I can get them? Thanks-
we have bought Emotiv EPOC EEG and have it connected to SMI RED eye-tracker. Does anybody have an experience of such data analyses?
We do not believe to "emotions" that are displayed directly in SMI BeGaze, so we would like to anylyse raw data.
Our research is focused on cartography, so we would like to analyse EEG data recorded during presentation of different types of maps.
Thanks for any help
Hello, I am very familiar with producing isochrones maps in ArcGIS by implementing Tobler's hiking function. I was wondering if anyone here is familiar with QGIS' r.walk module which is used to calculate anisotropic cumulative cost surfaces, and if anyone knows about a good (online) resource that provides a step-by-step guide.
I will be obliged if any one can provide me the above mentioned map.
If I was used a Geological map of an area, and it was re-exported with a new colors and symbols differ from the original. Is this considered as a modified map?
I am looking for shapefiles for all the individual districts of India. Can anyone help me in finding INDIVIDUAL shape files, separately for all the districts over India.
I am looking for information about Francisco Gali, sailor and cartographer of the sixteenth century. Also it is known as F. Stroza Gali, Galy or Gally. It seems that was known to Sevilla and traveled to America, he lived in New Spain and made several trips of exploration by the west coast of North America. In 1584 he traveled from Acapulco to the Philippines, writing the chronicle of his journey that was later published. However, nothing is known (at least I have not found) Gali before traveling to the New World.
Greetings, International Development Advisor, currently in the field. So, this issue is a bit pressing as I am providing support for Primary Health Care clinics. A simple Python script works in the ArcMAP Python Window, but not in the Field Calculator. I have attached a screen capture. I'm trying SQL layer definitions as a workaround. Thanks!
Exploratory data analysis (Tukley, 1977) is a solution. But did someone experience any other solution to indentify the link beetwen land use changes and urban mobility ?
Maps and other kind of geovisualizations such as globes, interactive 3-d worlds etc. seem to be very popular and fascinate a lot of people. But what is the reason for this (just aesthetics, potential immersion/fantasy firing, exploratory spirit, ...)?
Well, of course there are a lot of threads in the Web that deal with this question. But for me, the answers I found there are not really satisfying (often fuzzy, not pointing-out the core issues). Who knows research works, scientific papers, or useful Web-links addressing this topic?
If we knew what makes geovisualization such interesting, maybe we could export these ideas and concepts to other domains, e.g. to set-up interesting user interfaces for (non-geospatial) applications, or to design innovative experiental spaces, etc.
I'm curious about your thoughts and ideas!
Valentin de Ampudia was a noted map maker during his two decades of active duty with the Royal Engineers, mainly active in the northern provinces of Mexico, ca 1815-1822. I believe he either married a relative of one of the last viceroys (Grimarest), or his mother was of the Grimarest family, and (by then I believe his rank may have been Col. or Lt. Col.) Ampudia may actually have left Mexico to return to Spain with the Grimarest family at the same time the viceroy was deposed? Also, does anyone have a clue if/where any drawing/painting of him was ever done? Mil gracias!
I am working in national cartography of dengue and malaria risks in El Salvador using GIS. I am using Hierarchy Analysis Method, and one of the factors that I took into account is annual rainfall. I grouped each subfactor in different weights 1, 2, 3. For example according scientific literature about the relationship of Aedes mosquitoes and temperature: 1- (average temp less than 13 C) - Low mosquitoes activity; 2- (average temp. 13-20 C - moderate activity; 20-33 high activity). I found a lot of references that speak about the importance of rainfall (linked to humidity conditions) about mosquitoes proliferation, however I didn't found any reference about rainfall thresholds. Could you give me some references please? Thank you very much for your kindly attention.
I have metadata in my .dat file that tells me that my cell size is 0.200 degrees longitude. I want to import this file into GIS and convert my points to raster.
My file is very simple: it has x, y coordinates and the environmental variable. Its coordinate system is in NAD83.
I am wondering what value I have to input for the cell size when I am using the point to raster toolset in ArcMap. I have two different files with two different resolutions (one is the 0.200 degrees longitude and the other is 3km2) and no other raster file to compare it to; and so for cell size do I input 0.2 and 3 respectively.
I would like to determine the river mile of 25 sites along the Ohio River (USA). I understand that there is an ArcGIS tool for measuring the distance between two points, but I am not sure how accurate this method would be for a river that stretches nearly 1000 miles. Is there an interactive map or GIS data layer that will show river mile by clicking on any point of the river?
I am doing a research paper on cartography. I know that there are different opinions regarding the most useful type of projection map. I'm just looking for some opinions and why you think, for example, a Peters Projection is more useful in today's world than a Mercator Projection. But, it doesn't need to be narrowed down to that. This is just one idea.
Thanks, Sam Rubin
I am developing a huge database about cultural water heritage and I would like to relate it with the data mining methodologies...
Thank you all
I am trying to create an overlay between different (digitised) historical maps and the current map of a city in GIS. What methods are there to reconstruct historical maps in such a way that they accurately overlap with modern geodata?
I currently have the digitised version of three historical maps which were drawn at different scales (1:10.000, 1:5000, 1:2000) and in different projections.
I analyze the evolution of soil erosion in several dates and in several basins of Andalusia (Spain). The cartography which I possess is raster, and I am applying with ArcGis the slope of the regression curve to see trends of increase or decrease of the values in some periods. Can you recommend some papers related?
Does anybody have a set of references for literature about map use (cartography), ideally from the 1500's to date? Not map design methods, the politics of representation with map-houses of the 1850's, or disputes over projection etc., but specifically on how maps have historically been used (and perceived as objects) in everyday life e.g., how they were incorporated into school syllabus, how they were used in leisure activities, how they were integrated and dissiminated in the post-WWII rebuild etc.