MATLAB: Overlay polygon on geographic axes

Question

I would like to overlay a patch (filled polygon) on a geographic axis created using geoaxes. Is there any way to do this in R2019b? I have only found functions for plotting lines and symbols (geoplot, geoscatter).

This would be similar to patchm in the mapping toolbox.

Answer 1

You can use the patch() function to achieve the same. Use the code below.

% Plot your Geo data here
latSeattle = 47.62;
lonSeattle = -122.33;
latAnchorage = 61.20;
lonAnchorage = -149.9;
gx = geoaxes;
geoplot(gx,latSeattle,lonSeattle);
geobasemap(gx,'landcover');
 
% Plot your Patch data here
ax2 = axes;
x = [0.25 0.6 0.6 0.25]; % Modify x coordinates of the polygon 
y = [0.25 0.25 0.4 0.4]; % Modify y coordinates of the polygon
patch(ax2, x, y,'red','FaceAlpha',.4); % Modify patch color and transparency 
axis([0 1 0 1]);
% Set ax2 visibility to 'off'
ax2.Visible = 'off'; 
ax2.XTick = []; 
ax2.YTick = [];