I am using Quantum GIS and trying to spatially join a point grid with polygons that are overlapping. If I get the sum of intersecting features, then I can get a good raster value. Well, every time I attempt the spatial joing with the summary, I get the following python error:
An error has occured while executing Python code:
Traceback (most recent call last): File "/usr/share/qgis/python/plugins/fTools/tools/doSpatialJoin.py", line 99, in accept res = self.compute(inName, joinName, outPath, summary, sumList, keep, self.progressBar) File "/usr/share/qgis/python/plugins/fTools/tools/doSpatialJoin.py", line 214, in compute if k == "SUM": atMap.append(sum(numFields[j])) TypeError: unsupported operand type(s) for +: 'int' and 'QPyNullVariant'
Python version: 2.7.4 (default, Sep 26 2013, 03:23:21) [GCC 4.7.3
Any idea why I may be getting this error? I am trying to join 65,527 points to 121 polygons in this case.
Thanks for the help!