topic Re: Click/Populate Script for Modeling in Python Questions

Click/Populate Script for Modeling

raja — Tue, 01 May 2012 15:41:22 GMT

GIS Gurus,

I am a baseline GIS user and unfortunately not too knowledgeable/savvy in scripts/advance programming. I'm looking for a script (or any other advice you can provide) that will automate a rather tedious process that I've encountered...

I have a point feature class with over 1000 unique entries, each representing a node in a water network. Each node has a Node ID associated with it. I am creating a polygon feature class which contains areas contributing to each node. Ideally, I would like a script which allows me to draw the polygon and then prompts me to click on which node the polygon is associated with. This selection would in turn populate a field in the polygon feature class with the Node ID.

Does anybody have anything they can share that would accomplish this? Or know where I can start? Thanks in advance!

Re: Click/Populate Script for Modeling

DarrenWiens2 — Tue, 01 May 2012 16:12:32 GMT

Have you looked into the Watershed tool? You'll need the DEM to create your flow direction surface, but I don't know of any other way to generate upstream polygons.

Re: Click/Populate Script for Modeling

raja — Tue, 01 May 2012 17:19:55 GMT

I typically do use procedures similar to Watershed when I'm delineating stormwater subcatchments. However, in this case, my polygons won't be terrain-dependent. I have to draw them in based on service connections.

So in other words, my procedure would ideally be:

1. Activate the script (the basis or language of which I am requesting in this thread)
2. Create a polygon feature (assume the feature class name is Shapefile_P)
3. Script would prompt me to click on a node (which would be in a points feature class, Shapefile_N)
4. Based on selection, script would read the associated NodeID from Shapefile_N and place this data in a field in Shapefile_P.
5. repeat forever on end

Hopefully that provides a little more clarification on my end goal.