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The POLY_AREA function returns the area of a polygon given the coordinates of its vertices. This value is always positive.
It is assumed that the polygon has n vertices with n sides and the edges connect the vertices in the order:
[(x1,y1), (x2,y2), ... , (x n ,y n ), (x1,y1)]
such that the last vertex is connected to the first vertex.
This routine is written in the IDL language. Its source code can be found in the file
poly_area.pro
in the
lib
subdirectory of the IDL distribution.