Identifying feature OID from Geometry object using ArcPy?

Question

I know ArcPy allows you to access geometries directly using the CopyFeatures_management method. Note in their code sample for the Geometry object, it is very simple to copy the geometries to in-memory objects of type Geometry (and extremely fast). The geometry object of course relates to the geometry/shape and completely bypasses attribute information.

My question is whether there is a way to identify the OID of each geometry cheaply?

A little background in what I am trying to perform:

1. For all feature classes in a geodatabase
2. Read through each feature's geometry
3. Go over the points in the geometry
4. Calculate the distances between the points
5. If the distance is below a threshold, that specific feature needs to marked for review (meaning I need either the OID/FID or any other field to identify it).

As I am still in ArcGIS 10.0, I would prefer to not use cursors that seem to work a lot slower than simply dealing with the geometries.

Answer 1

You can't determine the OID directly from the geometry object, it doesn't know anything about it. The row object in a cursor has that field, just use row.OID in your cursor.

You probably want to just Generate a Near Table and then Select by Attributes on the new table against the distance field to find geometries that are too close ([]NEAR_DIST] < X). Once you've run select by attributes you can use a cursor to iterate over only the OIDs that matter:

oids = set()
for row in arcpy.SearchCursor(r'in_memory\new_near_table'):
    oids.add(row.IN_FID)
    oids.add(row.NEAR_FID)

And from there you can select by attributes on the original table:

arcpy.management.SelectLayerByAttribute("original_lyr", "NEW_SELECTION", 'OID in (%s)' % (', '.join(str(oid) for oid in sorted(oids))))