added perimeter method rmp #4
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| points.append((shp.GetX(p), shp.GetY(p))) | ||
| Nedges = len(points)-1 | ||
| length = [] | ||
| for i in xrange(Nedges): |
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Might want to do this via pure numpy (diff, norm, sum).
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added a perimeters method to vector.py. Can transform, then calculates perimeter by summing the distance between points of a polygon or a collection of polygons (multipolygon). Returns series (same methodology as areas method, but stays in GDAL for projections other than UTM (needs to convert to shapely then back to GDAL geometry to remain consistent with the areas methodology).