topic The intersection of two polygons in Python Questions

The intersection of two polygons

XintaoLiu — Sun, 18 Nov 2012 00:56:34 GMT

Now I have two shapes of polygons, how to get the intersection area of them?

I tried: interShp = Shp1.intersection(shp2), but it does not work.

Thanks in advance.

Re: The intersection of two polygons

T__WayneWhitley — Sun, 18 Nov 2012 14:34:49 GMT

You can use geometry objects with the Intersect tool, see this:
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//002z0000001z000000

In your case as you've described it, you would create 2 objects to enter as input, potentially writing a 3rd geom object or write the output to a new shapefile or fc.

Re: The intersection of two polygons

MikeHunter — Sun, 18 Nov 2012 20:15:27 GMT

What you are trying to do will work with arcpy 10.0 or 10.1. But you are calling the geometry object method wrong:

 interShp = Shp1.intersect(shp2, 4)

Not "intersection, but "intersect." And you need the 2nd arg, the dimension of the output geometry. You said area, so that would be 4.

good luck
Mike

Re: The intersection of two polygons

XintaoLiu — Sat, 11 Dec 2021 11:53:52 GMT

What you are trying to do will work with arcpy 10.0 or 10.1. But you are calling the geometry object method wrong:
 interShp = Shp1.intersect(shp2, 4)
Not "intersection, but "intersect." And you need the 2nd arg, the dimension of the output geometry. You said area, so that would be 4.

good luck
Mike

Thank you so muck! It works!

By the way, where can I find such specific reference and examples to read? Thank you again.

Re: The intersection of two polygons

T__WayneWhitley — Mon, 19 Nov 2012 00:39:45 GMT

I am not using 10.1 yet but found the method, intersect(other, dimension), documented here:
http://resources.arcgis.com/en/help/main/10.1/index.html#//018z00000061000000

Thanks Mike, I was unaware of this and although I couldn't find the specific doc for 10.0, I will try this out tomorrow.