Hello, I am trying to calculate univariate statistics from a raster based on a series of buffer polygons that I created around a point layer. The problem is that the buffer polygons overlap with neighbouring ones, creating new polygons in areas where they intersect. As a result, when I run v.stats.rast in GRASS, I end up calculating raster stats for a lot more polygons (>500) than the original buffers that I had (~70), making it impossible to calculate the raster statistics per original buffer (especially since hundreds of the small polygons are shared by several buffers). I tried creating the buffers in QGIS directly using fTools, but whenever I import them in GRASS their topology changes. As I understand it, GRASS does not like overlaping vectors and “cleans” the topology of the overlapping buffers. Is there a way around this problem, so that I can calculate the raster stats for each buffer? I would greatly appreciate your feedback with this challenge. Regards, Christos |
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