MATLAB: Surface bounded by a polygon

polygonsuface

I have a polygon and a surface that covers only part of this polygon (this is in 2-D x and y axis). Is there any way to delimit the surface by the polygon? I want only the part that is inside the polygon.

Thanks.

Best Answer

Without any sample data or illustrations it's mighty difficult to know exactly what you mean, but it sounds like inpolygon is the function you're looking for. Just feed it the x,y locations of your surface (generated by meshgrid) and it will tell you which corresponding surface locations are inside the polygon.

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MATLAB: ‘inpolygon’ returns zeros logical variable (R2019b, Win10)

Note that longitude is horizontal and latitude is vertical, so you'd need to swap LAT and LON in your call to inpolygon. (Like you have in your call to isinterior in the solution you found.)

MATLAB: How to specify points outside a polygon

IN = inpolygon(lon, lat, x0, y0);
lon  = lon(~IN);
lat  = lat(~IN);
ph1  = ph1(~IN);

Best Answer

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MATLAB: ‘inpolygon’ returns zeros logical variable (R2019b, Win10)

MATLAB: How to specify points outside a polygon

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