Issues with spatial reference object from currently active map

SeanConway — Fri, 27 Jan 2023 15:13:02 GMT

I'm having an arcpy issue where I'm trying to pull a spatial reference object from the currently active map to use to create a point geometry. It works fine if I pull it from the first layer in the ToC:

insr = arcpy.Describe(layers[0]).spatialReference

But if I pull it from the currently active map:

aprx = arcpy.mp.ArcGISProject("CURRENT") m = aprx.listMaps()[0] insr = m.spatialReference

then I get an error. Both the layer and the map return a spatial reference object, but when I use the one from the map, it ends up erroring out on this line:

point1 = arcpy.PointGeometry(arcpy.Point(extent.XMin,extent.YMin),insr)

Traceback (most recent call last):
  File "<string>", line 12, in <module>
  File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\arcobjects\geometries.py", line 86, in __init__
    super().__init__(inputs, spatial_reference, has_z, has_m)
  File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\arcobjects\mixins.py", line 223, in __init__
    self._arc_object = gp.CreateObject('geometry', self.__type_string__,
  File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\geoprocessing\_base.py", line 512, in <lambda>
    return lambda *args: val(*gp_fixargs(args, True))
  File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\geoprocessing\_base.py", line 43, in gp_fixargs
    new_args.append(gp_fixarg(arg, string_results, pass_arc_object))
  File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\geoprocessing\_base.py", line 30, in gp_fixarg
    if isinstance(arg, Result) and string_results:
RuntimeError: SpatialReference: Get attribute __class__ does not exist

The attached images are an example of the object it's returning where insr is the SR object from a layer and insr2 is the object from the map. They are different projections but that shouldn't be an issue. If I use exportToString() on the map object and then use that to loadFromString() on a new SR object then it will also work, but that seems like a needless workaround.

Thanks in advance for any help.

Re: Issues with spatial reference object from currently active map

JohannesLindner — Mon, 30 Jan 2023 13:41:16 GMT

Yeah, sometimes arcpy can be tricky with the conversion between Result objects, geoprocessing xyz objects and the "pure" xyz objects.

In this case, you can just create a new SpatialReference with the factory code of your extracted sr:

m = arcpy.mp.ArcGISProject("current").activeMap extent = m.defaultCamera.getExtent() map_sr = m.spatialReference map_point = arcpy.PointGeometry(arcpy.Point(extent.XMin,extent.YMin), map_sr) # error map_sr = arcpy.SpatialReference(map_sr.factoryCode) map_point = arcpy.PointGeometry(arcpy.Point(extent.XMin,extent.YMin), map_sr) # works

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Issues with spatial reference object from currently active map

Re: Issues with spatial reference object from currently active map