topic Re: spatial difference in Esri Tutorials Questions

spatial difference

johnwoollett1 — Tue, 13 Dec 2016 13:54:27 GMT

I have two features consisting of polygon shapes. How can I run a query that gives me the areas in one feature that do NOT overlap areas in the other feature.

Thanks

Re: spatial difference

JayantaPoddar — Tue, 13 Dec 2016 14:14:41 GMT

Are you using ArcGIS Desktop? Then you are looking for Erase.

Re: spatial difference

johnwoollett1 — Tue, 13 Dec 2016 14:18:17 GMT

I am using ArdGIS desktop, I am not looking to erase, just get a list of polygons from two feature classes that do not overlap

Re: spatial difference

JayantaPoddar — Tue, 13 Dec 2016 14:53:18 GMT

Maybe you would like to Select By Location, the features from Polygon1 which overlap with Polygon2. Then Switch Selection to get the non-overlapping polygons. You could export the attribute table with the selected features to get the list of tables.

Repeat the same for Polygon2 as well.

I think, this can also be automated using Python.

Re: spatial difference

AdamZiegler1 — Tue, 13 Dec 2016 14:57:29 GMT

Hi John - I would do this process separately for each feature class.

Select all the features in feature class A
Use Select by Location
1. Set Selection Method to 'remove from the currently selected features in'
2. Target layer: feature class A
3. Source layer: feature class B
4. Spatial selection method: 'intersect the source layer feature'
The results are the features in feature class A that do not overlap feature class B
You could right click on the layer in the TOC and choose 'Selection' --> 'Create layer form selection' which will preserve the featues in their own layer, so that you can perform the same steps on feature class B

Hope this helps,

Adam Z

Re: spatial difference

JoshuaBixby — Tue, 13 Dec 2016 16:06:12 GMT

If you use the Select Layer By Location tool instead of the Select By Location dialog, there is an invert_spatial_relationship parameter you can use to do what you want in a single step.