topic Select Current Feature in a Search Cursor Loop in Python Questions

Select Current Feature in a Search Cursor Loop

ClintonCooper1 — Thu, 30 Apr 2015 15:40:24 GMT

I am looping through a shapefile using a Search Cursor loop, and need to create a specific operation. I need to select the current feature that the loop is on, and then run a select by location operation on that selected feature. Once my operation is done, I then need to move onto the next feature in the loop. Here is my current code:

import arcpy

fc = r"V:/Metro/STOP_CONSOLIDATION/STOPS.gdb/Stop_Database_Points"
fields = ["BEGINSTOPI", "METRO", "GpsLongitu", "GpsLatitud"]

with arcpy.da.SearchCursor(fc, fields) as cursor:
for row in cursor:

arcpy.SelectLayerByLocation_management(point_lyr, overlap_type="WITHIN_A_DISTANCE", select_features=point_lyr, search_distance="1320 Feet", selection_type="NEW_SELECTION", invert_spatial_relationship="#")

ps, as a side note, how do I add code tags to the new board?

Re: Select Current Feature in a Search Cursor Loop

DarrenWiens2 — Thu, 30 Apr 2015 16:30:54 GMT

See here for Posting Code Blocks.

Re: Select Current Feature in a Search Cursor Loop

AllenDailey1 — Tue, 02 Feb 2021 18:35:07 GMT

Hi! I am hoping to achieve this exact thing. Did you ever figure out how to do it, @ClintonCooper1 ?

Thanks!

Re: Select Current Feature in a Search Cursor Loop

Anonymous User — Tue, 02 Feb 2021 20:32:29 GMT

You need to get the row ID or OBJECTID from the cursor, then use it in a SQL query in the selectlayerbyattribute to select the feature. Then use the selected feature in the select by location. Something like:

fc = r"V:/Metro/STOP_CONSOLIDATION/STOPS.gdb/Stop_Database_Points" fields = ["OBJECTID", "BEGINSTOPI", "METRO", "GpsLongitu", "GpsLatitud"] with arcpy.da.SearchCursor(fc, fields) as cursor: for row in cursor: whereclause = """OBJECTID = {}""".format(row[0]) selectLyr = arcpy.SelectLayerByAttribute_management(fc, "NEW_SELECTION", whereclause) intersectLyr = arcpy.SelectLayerByLocation_management(point_lyr, overlap_type="WITHIN_A_DISTANCE", select_features=selectLyr, search_distance="1320 Feet", selection_type="NEW_SELECTION", invert_spatial_relationship="#")

then do something with the selected by location layer. You'll have to update the code to match your field names.

Re: Select Current Feature in a Search Cursor Loop

JoshuaBixby — Tue, 02 Feb 2021 23:11:59 GMT

Although this approach will definitely work, I think a cleaner approach would be to retrieve the geometry in question and pass that to Select Layer By Location since that tool can accept ArcPy geometry objects as the selecting layer.

fc = r"V:/Metro/STOP_CONSOLIDATION/STOPS.gdb/Stop_Database_Points" fields = ["SHAPE@", "OBJECTID", "BEGINSTOPI", "METRO", "GpsLongitu", "GpsLatitud"] with arcpy.da.SearchCursor(fc, fields) as cursor: for row in cursor: shp = row[0] intersectLyr = arcpy.SelectLayerByLocation_management(point_lyr, overlap_type="WITHIN_A_DISTANCE", select_features=shp, search_distance="1320 Feet", selection_type="NEW_SELECTION", invert_spatial_relationship="#")

Re: Select Current Feature in a Search Cursor Loop

Anonymous User — Tue, 02 Feb 2021 23:30:49 GMT

That is pretty legit. Thanks!

Re: Select Current Feature in a Search Cursor Loop

AllenDailey1 — Wed, 03 Feb 2021 00:16:10 GMT

Thank you very much, JeffK and JoshuaBixby, for your helpful replies!!