contourm plot on the map axes shrinks

I have a sea level pressure data set (25 x 47 x 262 double). The first two dimensions are latitudes and longitudes. The third dimension is the time. I used the function contourm to plot the contour map of the mean of the data on the map axes using 'mercator' projection, but the plot shrunk and became unreadable. Then I realized I couldn't plot the data for some individual days (i.e. day 252) on the map axes.

But for most of the days, the contourm works.

I also tried to plot the contour map on the normal xy axes, everything worked fine.

The code I used is as follows.

clc
clear all
close all
load('slp.mat')
close all
figure(1)
set(gcf,'Color','w')
axesm('mercator','MapLatLimit',[-40, -25],'MapLonLimit',[140, 152.5])
axis off; framem on; gridm on; mlabel on; plabel on;
setm(gca, 'MLineLocation', 2,'PLineLocation',2,...
    'MLabelLocation',4,'PLabelLocation',4,'LabelUnits','degrees',...
    'MLabelRound',-1,'PLabelRound',-1)
% [c,h] =contourm(lat,lon,mean(slp,3));
% [c,h] =contourm(lat,lon,mean(slp(:,:,[1:251,253:end]),3));
% [c,h] =contourm(lat,lon,mean(slp(:,:,251:254),3));
[c,h] =contourm(lat,lon,slp(:,:,251));
clabelm(c,h)

figure(2)
set(gcf,'Color','w')
axesm('mercator','MapLatLimit',[-40, -25],'MapLonLimit',[140, 152.5])
axis off; framem on; gridm on; mlabel on; plabel on;
setm(gca, 'MLineLocation', 2,'PLineLocation',2,...
    'MLabelLocation',4,'PLabelLocation',4,'LabelUnits','degrees',...
    'MLabelRound',-1,'PLabelRound',-1)
[c,h] =contourm(lat,lon,slp(:,:,252));
clabelm(c,h)

figure(3)
contourm(lat,lon,slp(:,:,252))
xlabel('longitude');
ylabel('latitude');

I don't know what makes the contourm plot fail on some of the data.

Answer 1

[Eirik Mikal Samuelsen]

I have the same problem. Are there any answers out there?

I have applied the same code for these two plots, but due to the difference in the underlying .nc file, they are for some reason plotted differently...