Scatterm/plotm not working when plotting points over surfaces

Hello,

My problem is that I want to plot specific lat/lon points (using scatterm/plotm) over a surface (Digital Elevation Map) plotted with surfacem/surfm. However, points are not shown. Here is the code I use:

% plot map

hf=figure;

worldmap(latlim,lonlim)

% plot the DEM

kk=surfm(double(U.lat),double(U.lon),double(U.Heights));

% plot the site

hold on;

plotm(lat,lon,'sk', 'MarkerSize', 10, 'MarkerFaceColor', 'k');

% plot the pixels borders

for i=1:2

    for j=1:2

        la=latO(i,j);

        lo=lonO(i,j);

        hold on;

        scatterm(la,lo,15,'ok','filled')

        linem([la+Hres la+Hres],[lo-Hres lo+Hres],'-k','LineWidth',2)

        linem([la-Hres la-Hres],[lo-Hres lo+Hres],'-k','LineWidth',2)

        linem([la-Hres la+Hres],[lo-Hres lo-Hres],'-k','LineWidth',2)

        linem([la-Hres la+Hres],[lo+Hres lo+Hres],'-k','LineWidth',2)

    end

end

Note that lines plotted with linem are visible whilst points plotted with scatterm are not. Can anyone help me please? Thank a lot in advance. Regards,

Lorenzo Luini