Timeline for Exploding overlapping to new non-overlapping polygons?
Current License: CC BY-SA 3.0
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| Aug 30, 2012 at 11:23 | comment | added | Alexandre Neto | @whuber You are right about being a very slow process (Toke me around half-hour with a 4284 x 3009 raster and 2401 polygons, in a dualcore 2.8Ghz, 3Gb RAM with vista). But It works, as I have tested it already. In the Spatial Join you have to use one to one relation, and aggregate the raster values (as mean, Sum, etc...). The result will be a vector polygon layer similar to the original but with a new column with the aggregated raster values that intersect each polygon. Not being a optimal solution this could be useful for someone with less programming skills (like me :-)). | |
| Aug 29, 2012 at 21:16 | comment | added | whuber | If I understand correctly what you mean by this spatial join, your second solution still won't work, Alexandre, because there is a many-to-many relation between the points and the polygons. Regardless, for any sizable raster this vector-based approach will be extremely inefficient and for large rasters it will be impossible to carry out. | |
| Aug 29, 2012 at 17:58 | comment | added | Alexandre Neto | You are right, sorry. I did not understood the question well. In that case, and depending on the size of the raster, I would normally convert the raster to a temporary point feature class (each cell a point), and perform a spatial join between it and the polygon layer. Maybe its a very simplistic, and performance unfriendly approach but works and the overlapped polygons won't give you any problem. | |
| Aug 29, 2012 at 17:32 | comment | added | ndimhypervol | this method doesn't get you to the desired product, which is a minimal series of selections or unique feature classes of the original that do not overlap. the products will be fed into zonal statistics, and therefore keeping the original geometry of each feature is vital. | |
| Aug 29, 2012 at 10:53 | history | edited | Alexandre Neto | CC BY-SA 3.0 |
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| Aug 29, 2012 at 10:44 | history | answered | Alexandre Neto | CC BY-SA 3.0 |