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How to apply hatched region to a polar map

Asked by HA
on 23 Jan 2019
Latest activity Answered by Chad Greene
on 15 Feb 2019
I have a polar contour map using the mapping toolbox (see code below) that I would like to add a hatched region to, in order to show significance.
load coastlines
axesm('stereo','Origin',[-90 0],'MapLatLimit',[-90 -30])
framem on;
gridm on;
setm(gca,'MLabelParallel',-20)
pcolorm(latmesh(1:48,:),lonmesh(1:48,:),DataZ')
shading interp;
geoshow(coastlat,coastlon)
axis off
set(gca,'xtick',[],'ytick',[])
title('Z','fontsize',14)
set(gca,'FontSize',12)
caxis([-15,15])
colormap redblue
I am able to get the desired hatched region on a normal contour plot (See below).
figure(2);
[C,h]=contourf(latmesh,Ymesh,DataZ)
set(h,'linecolor','none')
hold on
box on
title('Y','fontsize',14)
set(gca,'FontSize',12)
caxis([-6,6])
colormap redblue
xlabel('lat (°)')
figure(2);
[c1,h1]=contourf(latmesh,Ymesh,DataZsig,[2.5 2.5]-10);
set(h1,'linestyle','none','Tag','HatchingRegion');
ax1=gca;
hp=findobj(ax1,'Tag','HatchingRegion');
set(h1,'linestyle','none');
However, When I try to use this method with the polar contour map, it does not work.
Does anyone have any suggestions on how to make this work?
Thank you!

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2 Answers

Answer by Chad Greene
on 15 Feb 2019

For anyone who wants to do this with Antarctic Mapping Tools, you may be able to use my stipple function. For a lat,lon grid and corresponding mask, just convert lat,lon to x,y and then use stipple like this:
[x,y] = ll2ps(lat,lon);
stipple(x,y,mask)

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Answer by Mark Brandon on 23 Jan 2019

Hi Holly,
What's your latmesh, longmesh and Ymesh?
Also you're plotting Antarctica. Do you use the Antarctic Mapping Tools toolbox?
Mark

  2 Comments

Hi Mark,
The mesh variables are grids of lat and lon, and for the one that works it is a lat and height grid. I think the problem is in the difference between contourf pcolourm.
Yes, I originall did the polar maps with the Antarctic Mapping toolbox, but found the method above to give me better plots. When I used the Antarctic Mapping toolbox I had simialr problems with plotting hatched markings (unable to call upon h1 as I am in the plot that works).
Holly
What a drag. Sorry not easy to solve.

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