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Python Script to Calculate Geometry Attributes from Selected Feature

ABishop

Hello All,

I am running ArcGIS Pro 2.8. I am also experimenting with Visual Studio to build an add-in with a button. I want the button to run a python script which calculates the geometry attributes (acres) of a selected polygon and then I plan to make the add-in button available to our users in the office. I was going to build a model in ArcGIS Pro which uses the "Calculate Geometry Attributes" tool to do this, but I quickly realized a few issues: #1 use the feature that is hard coded to my profile path and #2 not sure it will allow me to add a parameter to require the use to select the feature they want calculated due to the the issue with #3 the data source is a polygon stored in an SDE which is versioned. Any suggestions?

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Accepted answers

ABishop

I already did that several times. I am going to just eliminate that logical operation from the model in order to export it as a script. Its not optimal though. Unfortunately this wasn't solved.

ABishop

I did try exporting it several times. That logical operator is only meant for model builder. I think what I am going to do at this point is just build the model to select all parcel features that contain a null value and then use that selection to calculate the geometry attributes.

Thank you for all your help. Sorry this one wasn't solved. 😕

All comments

ABishop

Here is the script from the model. I didn't ever have a script that ran properly. Only the model ran properly.

# -*- coding: utf-8 -*-
"""
Generated by ArcGIS ModelBuilder on : 2021-09-17 14:39:12
"""
import arcpy
def #  NOT  IMPLEMENTED# Function Body not implemented

def GeometryCalc():  # GeometryCalc

    # To allow overwriting outputs change overwriteOutput option to True.
    arcpy.env.overwriteOutput = False

    arcpy.ImportToolbox(r"c:\program files\arcgis\pro\Resources\ArcToolbox\toolboxes\Data Management Tools.tbx")
    # Model Environment settings
    with arcpy.EnvManager(scratchWorkspace=r"C:\Users\abishop\AppData\Local\Temp\ArcGISProTemp10544\1ba0f558-c873-4c6c-be6d-dc08393016c0\Default.gdb", workspace=r"C:\Users\abishop\AppData\Local\Temp\ArcGISProTemp10544\1ba0f558-c873-4c6c-be6d-dc08393016c0\Default.gdb"):
        parcel_2_ = "parcel"

        # Process: Select Layer By Attribute (Select Layer By Attribute) (management)
        parcel, Count = arcpy.management.SelectLayerByAttribute(in_layer_or_view=parcel_2_, selection_type="NEW_SELECTION", where_clause="GIS_ACRES IS NULL", invert_where_clause="")

        # Process: If Selection Exists (If Selection Exists) ()
        True_69, False_70 = #  NOT  IMPLEMENTED(in_layer_or_view=parcel_2_, selection_condition="EXISTS", count=0, count_min=0, count_max=0)

        # Process: Calculate Geometry Attributes (Calculate Geometry Attributes) (management)
        if True_69:
            parcel_3_ = arcpy.management.CalculateGeometryAttributes(in_features=parcel_2_, geometry_property=[["GIS_ACRES", "AREA"]], length_unit="", area_unit="ACRES", coordinate_system="PROJCS[\"NAD_1983_StatePlane_Florida_West_FIPS_0902_Feet\",GEOGCS[\"GCS_North_American_1983\",DATUM[\"D_North_American_1983\",SPHEROID[\"GRS_1980\",6378137.0,298.257222101]],PRIMEM[\"Greenwich\",0.0],UNIT[\"Degree\",0.0174532925199433]],PROJECTION[\"Transverse_Mercator\"],PARAMETER[\"False_Easting\",656166.6666666665],PARAMETER[\"False_Northing\",0.0],PARAMETER[\"Central_Meridian\",-82.0],PARAMETER[\"Scale_Factor\",0.9999411764705882],PARAMETER[\"Latitude_Of_Origin\",24.33333333333333],UNIT[\"Foot_US\",0.3048006096012192]]", coordinate_format="SAME_AS_INPUT")[0]

if __name__ == '__main__':
    GeometryCalc()

ABishop

I posted it a couple times already in this thread.

Basically what I want to do is if the user has a parcel selected, then if they click the button that I want to create in ArcGIS Pro SDK, it will calculate the geometry attributes of that parcel. The field name is "GIS_ACRES".

blake.terhune

Well, post the full script you export that actually runs and describe the logical operation you'd like it to have. We'll come up with a solution together.

ABishop

how?

blake.terhune

The logic could easily be added back in manually in the Python script.

ABishop

@BlakeTerhune

Thank you again for the information but its not exactly what I am trying to do with this workflow. The mapping module requires that I have a set project for this button to work and unfortunately our users all have their own projects and edit versions. I would basically need to set the selection request from the user and have them select the feature. Based on their selection, the calculation of the geometry attribute would occur. I am looking into doing a model with parameters but having difficulty with that as well.

Amanda

blake.terhune

I'm not sure about making a custom selection and validating it with a model, but here are the tools I would use for writing my Python script.

Find the layer you want to work on using the mapping module (arcpy.mp)
Validate there is a selection with the layer's getSelectionSet() method (throw Exception if exactly one record is not selected.)
Start an arcpy Editor. Test without the Editor first in case it just works. I don't think you need it for calculate field.
Add geometry attributes. Only the selected features will have values calculated in the added fields; all other features will have null values. If this is not what you want, maybe try Calculate Field with the shape field.

ABishop

@BlakeTerhune

Thank you for your reply. I am not a python programmer, but I have written python code from models and geoprocessing tasks in ArcGIS Pro. Would you be so kind to point me to the specific tools and the order I should run them in the model? I would then use the model to create a python script which would be executed in the add-in button "On Click" function.

blake.terhune

With arcpy, you can find the layer you want by looking at the data source, validate if a feature is selected, and run calculate field on the layer (so it only calculates the selected field). You may need to use the Editor class to start and stop an edit session. Alternatively, you could put that responsibility on the user to start an edit session. Catch and handle the error that arises when not in an edit session and display a helpful message in the geoprocessing results indicating to the user what they need to do.

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