using worldmap in 0 to 360 longitude

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

Answer 1

[Kelly Kearney]

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);

[Pusks]

thank you! it works exactly.

[balaji SENAPATI]

why is it not working for pcolor?

[Sachini Pathirana]

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.

Answer 2

[Rob Comer]

Another approach is to follow

worldmap world

with

setm(gca,'Origin',[0 180])

in order to preserve the other worldmap settings.