How to generate a geographical heat map? (worldwide, country-level granularity)
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Franck Dernoncourt
el 14 de Jun. de 2013
Comentada: MikCh
el 23 de Abr. de 2022
I want to create a geographical heat map like the following in MATLAB:
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/148444/image.png)
Each color is based on a list of country with a percentage associated to each of them:
Country with Codes: % of Hits
- United States (US): 36.29%
- India (IN): 18.24%
- United Kingdom (GB): 12.93%
- Spain(ES): 8.22%
- Australia (AU): 3.32%
- Canada (CA): 3.05%
- Germany (DE): 2.49%
- Netherlands (NL): 1.66%
- Israel (IL): 1.39%
- China (CN): 0.83%
How can I do it in MATLAB?
I looked at http://mathworks.com/products/mapping and Googled around but I didn't find any easy way to do it. Such kind of maps are commonly used (e.g. straightforward to do with the Google Chart API) so I'm hoping someone here shares his/her experience.
Thanks,
Franck
[1]: http://i.stack.imgur.com/64DJY.png
2 comentarios
Brahim HAMADICHAREF
el 3 de En. de 2014
I am curious ... have you ever managed to do the same with the Mapping toolbox ? I also use Google maps API, but an only MATLAB solution would prefer !
Brahim
Respuesta aceptada
Antti
el 30 de Jun. de 2016
This can be quite easily done with the Mapping toolbox. Here's an example:
% read a shapefile with some regions in it
S = shaperead('usastatelo.shp');
numRegions = length(S);
% show the map
mapshow(S)
% get the current colormap
cmap = colormap;
numColors = size(cmap,1);
% create some random data [1 numRegions], each data point is associated with a region
data = randi(numColors,1,numRegions);
% set the colors of the regions using the 'FaceColor' -property
for i = 1:length(S)
% FaceColor is now a color from the current colormap, determined by
% it's data value
mapshow(S(i),'FaceColor',cmap(data(i),:))
end
This gives me the map figure in the attachment.
2 comentarios
Rui Li (AIRicky)
el 18 de Feb. de 2019
Thank you. I have a question on the answer. If my data is not integer, and range from 0.1 to 50.9, how can I specify the color for each region and add corresponding colorbar?
MikCh
el 23 de Abr. de 2022
Nice approach!
What if the data variable include both positive and negative values?
How do we need to modify mapshow(S(i),'FaceColor',cmap(data(i),:)) in the loop so as to accept negative values?
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