Recomendation on plotting data

I have a 360x180 matrix with data for each latitude and longitude on earth, I plot it like this:

imagescnan(loni,lati,squeeze(double(r4_sat(:,:)))')

I have another matrix with the same dimensions but only data on the points in which it is significative; I want to mark the locations on the map plotted earlier in which the data is significative but I don't know how.

Any sugestion helps Thanks for reading

[Walter Roberson]

Note:

imagescnan(loni,lati,squeeze(double(r4_sat(:,:)))')

should be the same as

 imagescnan( loni, lati, double(r4_sat).' )

Answer 1

[Walter Roberson]

   imagescnan( loni, lati, double(r4_sat).' );
   hold on

   threshold = 0.05;                     %for example
   mask = double(r4_sat > threshold);    %was it significant?
   mask(mask == 0) = nan;                %1 if significant, nan if not
   imagescnan( loni, lati, mask.' );

[Jaime de la Mota]

I'm afraid the code doesn't work; I have tried using

quiver(lati, loni, r4_sat_significative, r4_sat_significative)

but it fails too, seems like it has dimensions problems

[Walter Roberson]

Please show size(loni), size(lati), size(r4_sat), size(r4_sat_significative), class(r4_sat_significative), max(r4_sat_significative(:))