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-Calculate the centroid of the polygon (x,y) 2.- Draw lines from centroid for angles of 0º, 45º, 90º,...315º 3.- Find the points of intersection (xi,yi) of the lines with the polygon 4.- Determine the midpoints for each line: ((x+xi)/2,(y+yi)/2) 5.- End


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This is as you would expect - in WGS84 coordinates, a radius of 500 degrees covers the whole world (and more) so is equivalent to the global radius N. To get an analysis using a 500 metre radius, reproject the data to a suitable local coordinate system with a grid measured in metres, then rerun sDNA.


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