qgisunion
'NoneType' object has no attribute 'isGeosEmpty'
Above the error I get when attempting to combing two polygons of the same spatial extent, but of course with two different sets of information. Both have same projection defined. not sure why this isn't working. Do the attribute tables have to have at least one column of similar information?
You can do this in QGIS, there is a Merge shapefiles to one function. This, compared to Union which only combines 2 layers, combines multiple shapefiles (selected either individually or by a directory) into one, contains additional results if there are any overlaps and no attribute fields are lost in the final layer. First install the fTools plugin:
Once installed, you should see a set of new functions in the Vector menu from the toolbar:
isMultiPart() is a method of class QgsFeature. The error 'NoneType' object has no attribute 'isMultipart' means that at least one feature has geometry() of None. It might be a degenerated contour line with length 0, or some other error concerning geometry.
If you have problems using a provided tool, then first check geometry, eg delete polyline having length equal 0, polygon having area equal 0, or check their topology. This problems may or may not raise errors in tools, depending on which error handling the developer has taken into consideration.
In case you have written python code that raises this error, test the QgsGeometry object before using its methods or process the underlying geometry store:
geom = geometry()
if geom:
if not geom.isEmpty():
# do something useful
Or more in-depth checking:
geom = geometry()
if geom:
err = geom.validateGeometry()
if not err:
# do something useful
else:
print '%d geometry errors detected' % len(err)
Best Answer
Attributes should not affect it. The isGeosEmpty error is likely due to errors in geometry. As quoted from the link:
You can check/fix these errors using:
The Geometry Checker plugin which can be downloaded/enabled from the menu bar:
The GRASS tool v.clean which can be accessed from the Processing Toolbox.