using worldmap in 0 to 360 longitude

Question

Pusks 2011-6-16

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https://ww2.mathworks.cn/matlabcentral/answers/9640-using-worldmap-in-0-to-360-longitude

评论： Sachini Pathirana 2020-4-17

I am trying to plot rainfall data as a contour plot over a worldmap. The problem is that the data is in 0 360 longitude and the world map comes out half blank because that is in the 180 -180 longitude system. Changing my longitude to this system using longi=mod((longi+180),360)-180; is not working as the contours stretch out from the leftmost end to the rightmost end across the map. To avoid this I will need to rearrange the data in the matrices which is resource intensive. Is there a way I can simply plot the world map into the 360 degree system. I am using R2008b and the worldmap function is geoshow('landareas.shp', 'FaceColor', 'None')

Thanks PK

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Answer 1

Kelly Kearney 2011-6-16

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https://ww2.mathworks.cn/matlabcentral/answers/9640-using-worldmap-in-0-to-360-longitude#answer_13242

在 MATLAB Online 中打开

Instead of using worldmap, use axesm to manually create an axis with the limits you want:

 % Some fake data
 data = peaks(50);
 lat = linspace(-90,90,50);
 lon = linspace(0, 360, 50);
 % Plot the map
 axesm('robinson', 'maplonlimit', [0 360], 'frame', 'on');
 geoshow('landareas.shp', 'facecolor', 'none');
 contourm(lat, lon, data);

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balaji SENAPATI 2020-1-20

编辑：balaji SENAPATI 2020-1-20

why is it not working for pcolor?

Sachini Pathirana 2020-4-17

How to do this when plotting the data with pcolor? Been trying to do so. But the data just gets plotted over the worldmap and also doesn't seem to be in the proper proportion.

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