topic Re: ArcMap Field Calculator Python in ArcMap Questions

ArcMap Field Calculator Python

pınarspor — Sat, 01 May 2021 01:44:06 GMT

Hello everyone

I have a question concerning Python in ArcMap (field calculator):

I want to write following code with python, in attributes table; field calculator. But I can't.

Could you help me,

Thanks.

Dim pSpRef1 As ISpatialReference
Dim pSpRFc As SpatialReferenceEnvironment
Set pSpRFc = New SpatialReferenceEnvironment
Dim pGCS As IGeographicCoordinateSystem

Set pGCS =
pSpRFc.CreateGeographicCoordinateSystem(esriSRGeoCS_NAD1983)
Set pSpRef1 = pGCS
pSpRef1.SetFalseOriginAndUnits -180, -90, 1000000

Dim pPCS As IProjectedCoordinateSystem
Dim pSpRef2 As ISpatialReference
Set pPCS =
pSpRFc.CreateProjectedCoordinateSystem(esriSRProjCS_NAD1983USA_
Albers)
pPCS.SetFalseOriginAndUnits 0, 0, 1000
Set pSpRef2 = pPCS
Dim dblArea As double
Dim CenterX As double
Dim CenterY As double
Dim pArea As IArea

Set pArea = [shape]

Dim pGeo As IGeometry
Set pGeo = pArea
Set pGeo.SpatialReference = pSpRef1
pGeo.Project pSpRef2

Set pArea = pGeo
dblArea = pArea.Area

theKm = dblArea / 1000000

Re: ArcMap Field Calculator Python

DanPatterson — Sat, 01 May 2021 03:47:28 GMT

Use Add Geometry Attributes—Help | Documentation (arcgis.com)

If you want to calculate geometry in a different coordinate system and/or units

Re: ArcMap Field Calculator Python

pınarspor — Sat, 01 May 2021 11:06:32 GMT

Thenk you, but I need to know how in python

Re: ArcMap Field Calculator Python

DanPatterson — Sat, 01 May 2021 18:49:26 GMT

Then examine the code associated with the tool's script located in

C:\... your install folder ... \Resources\ArcToolBox\Scripts\AddGeometryAttributes.py

You will probably be able to simplify it substantially.

Re: ArcMap Field Calculator Python

pınarspor — Sat, 01 May 2021 22:51:14 GMT

Thank you again,

I examined it, but not figure it out. I'm new in Python.

I want to write with Python Parser of the Field Calculator.

Re: ArcMap Field Calculator Python

JoshuaBixby — Mon, 03 May 2021 14:29:53 GMT

Seeing there are existing tools to accomplish this task, and yet you want to write it on your own without explaining why, it seems like this may be a question for school/studies. If you can provide a reason why you have to write it in Python yourself, people may be more willing to help or offer additional suggestions.

Re: ArcMap Field Calculator Python

pınarspor — Wed, 05 May 2021 11:07:00 GMT

This is a situation related to Phd. I thought these steps wouldn't work, sometimes different results can come out, but they did.
thanks again, DanPatterson

thank you JoshuaBixby