topic Re: Creating polygons from points? in Python Questions

Creating polygons from points?

ChloeAsmar — Wed, 13 Aug 2014 06:56:40 GMT

Hey all!

So I have a point shapefile and I would like to build a polygon for each consecutive 3 points in this shapefile.

- I am having a hard time figuring out how to build a polygon from points in first place.

- Is there a way to write a Python script to do that? and If yes, is it possible to add an iteration function in the script so that it build a polygon for each consecutive 3 points in my shapefile?

Thanks a bunch!

Re: Creating polygons from points?

DanPatterson_Retired — Wed, 13 Aug 2014 07:03:18 GMT

It is possible through arcpy and the polygon class. The example at the bottom of the link provides such an example. Your task will be to read the features in as triplets and then save the results, however, you don't indicate your level of familiarity with programming in python or arcpy in general.

Re: Creating polygons from points?

RiyasDeen — Wed, 13 Aug 2014 07:06:29 GMT

Hi Chole,

Are you trying to create a TIN surface ArcGIS Help 10.1? If so you'll need 3D Analyst extension for that ArcGIS Help 10.1‌.

Re: Creating polygons from points?

ChloeAsmar — Wed, 13 Aug 2014 07:38:38 GMT

Hey Dan, thanks for the reply,

I am still an amateur when it comes to programming, but learning!

I usually try to look for available scripts and sort of combine them and try to modify them to fit what I need.

Re: Creating polygons from points?

DanPatterson_Retired — Wed, 13 Aug 2014 07:49:59 GMT

You should indicate the format of your point data to facilitate further guidance. There may be some pre-existing tools that will help with the reading of the data, for example, the Add XY data tool and the Create Feature Class tool. These can either be used manually within ArcMap or their associated code can be incorporated in a script to facilitate automation

Re: Creating polygons from points?

ChloeAsmar — Wed, 13 Aug 2014 08:15:55 GMT

Hey Riyas, no I am just trying to build separate polygons 🙂

Re: Creating polygons from points?

JanWijkstrom — Wed, 13 Aug 2014 09:25:37 GMT

You could use this model as a base for for your work

Best regards JanW