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
Use Add Geometry Attributes—Help | Documentation (arcgis.com)
If you want to calculate geometry in a different coordinate system and/or units
Thenk you, but I need to know how in python
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.
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.
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.
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