Auto Calculate area of polygon in attribute table when creating a new polygon in a feature class

MarcyC

Hello,

I am currently opening my web maps in ArcGIS Pro in order to auto calculate Acreage.

 

This is my current work flow:

1. • Open Attribute Table
   o Click on Fields List (right click on a field heading and click on “Fields” in the pop-up
   • Scroll to bottom to add a new field
   o Fill out Field Name and Alias as “Acre”
   o Change Data Type to “Double” and Number Format to “Numeric”
    In the Number Format Pop-up that appears change decimal places to 2
   • Save (in the ribbon at top)
   • Back in Attribute table
   o Right click – select calculate geometry
    Property: Area (geodesic)
    Area Unit: US Survey Acres
    Coordinate System: (click on the globe)
   • Projected Coordinate System
   o UTM
    North America
   • “NAD1983”
   o Zone10N

However, when polygons are added via AGOL or Field maps the field does not auto calculate. Is there a way to set this up so that when a new polygon is made there is a field that automatically shows the acreage. I would also like to do this with a line layer to calculate length.

 

Thank you, I would greatly appreciate any insight!

 

 

 

RPGIS

Hi @MarcyC,

If you are using field maps in agol then you would simply need to do a calculated expression for that field. Which would look like the steps below:

Create the new arcade expression to look like the one below

var edit = $editcontext.editType
var ShapeArea = $feature.Shape__Area
var CalcArea = 0
if( edit == 'INSERT'){
  //if area is in sq ft
  CalcArea = ShapeArea*0.0000229569
  //if area is in sq meters
  CalcArea = ShapeArea*0.00024711
  }
return CalcArea

For line lengths you can use the same approach.