Using scatterm to plot points on Globe Projection of world map (spherical)
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Amir
el 27 de Feb. de 2017
Comentada: Amir
el 6 de Mzo. de 2017
Hi all,
I am trying to plot points on the map using the Mapping toolbox. I am using the "Globe Projection", which gives me a 3D spherical map, however the "scatterm" function does not work. I have tried this on other map projections and it works fine.
A sample code for the 2-D case (which works) is below:
lat = rand(1,100)*100;
lon = rand(1,100)*100;
temp = rand(1,100)*20;
load coastlines;
worldmap world
plot3m(coastlat,coastlon,.01,'k','LineWidth', 1.5)
gridm('GLineStyle','-','Gcolor',[.7 .7 .7],'Galtitude',.02)
hold on
scatterm(lat, lon,10, temp, 'filled');
colorbar
Now if i try to do the same using the globe projection, i get the error " Not enough input arguments"
lat = rand(1,100)*100;
lon = rand(1,100)*100;
temp = rand(1,100)*20;
load coastlines;
ax = axesm('globe');
gridm('GLineStyle','-','Gcolor',[.7 .7 .7],'Galtitude',.02)
plot3m(coastlat,coastlon,.01,'k','LineWidth', 1.5)
hold on
scatterm(lat, lon,10, temp, 'filled');
colorbar
the "plotm" function seems to work on the globe projection, but i cannot specify the color for each point based on the value of "temp", the same way as scatterm.
Any thoughts on this?
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Chad Greene
el 1 de Mzo. de 2017
You pose the question well. I was able to replicate the problem. Here's a fix:
mstruct = gcm;
[x,y,z] = mfwdtran(mstruct,lat,lon,zeros(size(lat)));
scatter3(x,y,z,20,temp,'filled')
3 comentarios
Chad Greene
el 2 de Mzo. de 2017
Editada: Chad Greene
el 2 de Mzo. de 2017
Excellent, I'm glad it helped. I occasionally run into issues with Mapping Toolbox plotting functions, but often the problem can be circumvented by performing the coordinate transformation myself with mfwdtran, then plot using standard plotting functions.
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