plot heat map on map using Latitude, Longitude and my data value
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Amir
am 11 Dez. 2015
Kommentiert: Poulomi Ganguli
am 16 Jan. 2018
Hi,
i have a number of locations across Europe (lat,lon), and for each one i have a corresponding value (in a form of a vector). I would like to create a heatmap using the mapping toolbox such that the a circle is drawn around each lat/lon, with the colour of these circles being defined based on the value my vector.
a simple example is as follows:
figure(1);
f=worldmap([33 68],[-15 37]);
geoshow('landareas.shp', 'FaceColor', [1 1 1],'DefaultEdgeColor', 'b')
PointLatLon = [51 -2.3;54 -3.2;50 3.9;51 5.5;48 1.1];
mValue = [1 4 2 7 3];
plotm(PointLatLon(:,1),PointLatLon(:,2),'r.');
There is a code by Chad Greene which i can use to generate the circles (attached), but i don't know how to specify the colour in a heatmap form. the code for the circle can be found at: http://www.mathworks.com/matlabcentral/fileexchange/48122-circlem
Any help is much appreciated.
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Akzeptierte Antwort
Amy Haskins
am 29 Dez. 2015
Bearbeitet: Amy Haskins
am 29 Dez. 2015
I think that scatterm will work nicely. It would look something like this:
markerSize = 50;
scatterm(PointLatLon(:,1), PointLatLon(:,2), markerSize, mValue,'Filled');
colorbar
The colors will be chosen from the current colormap based on the value. You can use the colormap command or the figure's colormap editor to change the color coding scheme.
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Arnab Sen
am 29 Dez. 2015
I understand that you would like to put color for the circles created on the map. You can do this by sending 'facecolor' as an argument to the 'circlem' function. For example, you may call the function with the arguments as following MATLAB code snippet:
>> h = circlem(lats(1),lons(1),500,'facecolor','red');
For complete documentation of 'circlem', refer to the following link:
Jack
am 12 Jan. 2018
Hi, this looks exactly what I need. However, is it possible to plot it on top of a google map? I am looking at data at much smaller spatial scales - towns and cities, rather than the world map in the example shown here.
Thank you
1 Kommentar
Poulomi Ganguli
am 16 Jan. 2018
In that case, you have to read shapefile of your town/cities & repeat the above.
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