MATLAB: How to find if a x,y point is within a given polygon

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Is there a function, probably in the mapping community, that I could use to find out if a location specified by (Latitude, longitude) is within a polygon defined by the (Latitude, longitude) coordinates of the corners? A general function for x,y will do just as well. My polygon is convex, which is an easier problem than a general non-convex polygon.

Best Answer

The inpolygon function is included in base Matlab. If your polygons cover a small geographic area and don't cross the poles, you can probably just call it directly. For larger polygons, you may have to preprocess the polygon coordinates (see e.g. interpm, flatearthpoly).

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MATLAB: How to specify points outside a polygon

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

MATLAB: How to add cost to a polygon

You could have an array of structures - one structure for each polygon that stores the x, y, and cost as fields. For example, to assign the kth structure of the kth polygon:

polygons(k).x = yourXArray; % for that particular polygon.


polygons(k).y = yourYArray; % for that particular polygon.
polygons(k).cost = yourCostValue; % for that particular polygon.

Best Answer

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