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Python: select by Location and assign value from the source to the target

rf2

Hi All

I have a polygon layer with a 'lot' field and a points layer. I would like to use python to select the points by location (to find what points are contained in what polygons) and assign the value in the 'lot' field from the polygon layer to the point that is contained in the relevant polygon feature. Not sure how to create that link between the 2 layers...

Any help is much appreciated.
Thank you

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DarrenWiens2

Oh I see. It probably depends somewhat on the size of the datasets. Suppose there are 1000 points. You could do 1000 individual selections/field calculations, or 1 spatial join (to an in-memory feature class if you don't want to keep it) then 1 join then 1 field calculation. I'm guessing the second option is faster, but haven't tested.

alexis_s

Darren,

In my workflow option 3 might be a better an option. Spatial Join produces a whole new feature class as an output, instead of transferring an attribute from a selected polygon to the point features within the selected polygon. Thoughts?

DarrenWiens2

What's wrong with Spatial Join?

alexis_s

Ryan,

Did you ever find a solution to your question? Which option did you choose?

GregSnelling

There are 3 ways I can think of:

1) Use arcpy to spatially join the lot attribute from the polygon to the point.
http://resources.arcgis.com/en/help/main/10.1/index.html#//00080000000q000000

2) Use ArcPy to convert polygons to points and keep the attributes. The points will be populated with the Lot values.
http://http://resources.arcgis.com/en/help/main/10.1/index.html#/Feature_To_Point/00170000003m000000/

3) Use ArcPy to Select By Location, then calculate the point field values to equal lot number from the selected polygon feature; then use iterations of this process for each polygon in your feature class.

In my opinion I'd go with option 2 because it's the easiest. Option 3 is probably a more of a "learning experience".

Have fun!

G

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