topic Re: Square Mileage for polygon calculations in Python Questions

Square Mileage for polygon calculations

KeithJohnson2 — Fri, 19 Feb 2016 15:34:08 GMT

Help! I'm trying to do a simple calculation for square mileage and I keep getting 0's for every field. I am using a state plane PCS and I tried Float, Double, and Long and Short Integer fields with different settings for each.

I am definitely not an expert in Python so does anyone know what I might be doing wrong? And if so, a simple fix?

Re: Square Mileage for polygon calculations

AdrianWelsh — Fri, 19 Feb 2016 16:07:38 GMT

You might need to perform a repair geometry on your feature class first.

Repair Geometry—Help | ArcGIS for Desktop

Re: Square Mileage for polygon calculations

ChrisDonohue__GISP — Fri, 19 Feb 2016 16:48:44 GMT

You mention you are doing this in Python. Can you post your code so it can be evaluated? If it is just a one-liner, a screenshot will do. If it is longer, see the following link for how to post code in GeoNet, as it is not intuitive:

Code Formatting... the basics++

Having the code posted in the correct formatting will help GeoNet users troubleshoot the issue.

Python

Chris Donohue, GISP

Re: Square Mileage for polygon calculations

AjitkumarBabar — Fri, 19 Feb 2016 16:52:35 GMT

Hi Keith,

Can you provide more information like data type and origin of data ( is it imported from CAD), you might once check projected coordinate system of data if possible reproject it.

Re: Square Mileage for polygon calculations

GabrielUpchurch1 — Fri, 19 Feb 2016 19:22:53 GMT

As a test, have you tried simply right-clicking on the field name and selecting "Calculate Geometry?" This may help determine if it is a data-specific or python cause.