Hello,
On the one hand, I have a raster file which represents ground elevation. On the other hand I have a file from PostGIS with a shape_polygon geometry, which represents outlines of buildings. I'd like to create a new attribute per building in which there would be the average of all interiors cell values.
Any ideas ?
Thanks a lot,
JJ
Best answer by jdh
This is a case where dealing with PointClouds rather than rasters is much more efficient.
Add a counter to get an unique id on your buildings if they don't already have them. Set a NoDataValue on the Raster if it doesn't already have one.
Use a GeometryExtractor on the building to store the geometry as an attribute.
Clip the raster by buildings, with merge attributes set to yes.
Send the Clipped rasters to a PointCloudCombiner, grouping by the UniqueID
Use the PointCloudStatisticsCalculator to get the Mean of the z component.
Use a GeometryReplacer to restore the original building geometry.
You should now have your buildings with an addition attribute called z.mean.
+28This is a case where dealing with PointClouds rather than rasters is much more efficient.
Add a counter to get an unique id on your buildings if they don't already have them. Set a NoDataValue on the Raster if it doesn't already have one.
Use a GeometryExtractor on the building to store the geometry as an attribute.
Clip the raster by buildings, with merge attributes set to yes.
Send the Clipped rasters to a PointCloudCombiner, grouping by the UniqueID
Use the PointCloudStatisticsCalculator to get the Mean of the z component.
Use a GeometryReplacer to restore the original building geometry.
You should now have your buildings with an addition attribute called z.mean.
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