topic Best way to return whether a feature falls within a polygon? in Developers Questions

Best way to return whether a feature falls within a polygon?

Anonymous User — Tue, 11 Jul 2017 18:56:30 GMT

This is a fairly simple question: what is the best way to run a binary (yes/no) query to let me know if a point/polygon/line falls within an area. The use case is this: I have a parcel and want to return whether it falls within like five zones. I'm looking for a python solution if possible, as this will be iframed into a pop-up result in a custom Web App.

All I need is a 'yes' or 'no' result from the queries. Please help!

Re: Best way to return whether a feature falls within a polygon?

AllanLaframboise — Wed, 12 Jul 2017 18:20:33 GMT

I'm sure you can do this with Python but if the data are stored in ArcGIS feature services, then you can use any language to make a REST API call with the appropriate spatialRelationship operator and parameters. See the layer query doc here ArcGIS REST API .

Here's an example of a REST request that will return the state that intersects the given point:

https://services.arcgis.com/P3ePLMYs2RVChkJx/arcgis/rest/services/USA_States_Generalized/FeatureServer/0/query?where=&ob…

Re: Best way to return whether a feature falls within a polygon?

Anonymous User — Wed, 12 Jul 2017 18:54:52 GMT

This is actually perfect. You can execute the proper spatial queries both Map & Feature services, which is perfect.

Springboarding off of that realization -- are you familiar with a JS / Python code snippet that has an if/else statement for REST endpoint responses? My end-use is this: Hitting a webpage will trigger several of these spatial queries and return whether the point is in a number of areas (i.e. housing development area, wetland, etc.). I'm looking for a boolean logic of yes/no, so I imagine I could write a JSON parser to look for a !='No Record Found' and either print 'Yes' or 'No' depending on the response...

Do you know of any samples out there for parsing the REST API's responses?