topic Re: arcpy.AsShape() Concerns with .getArea() and .area in Python Questions

arcpy.AsShape() Concerns with .getArea() and .area

JamesCrandall — Sat, 11 Dec 2021 06:21:50 GMT

In an attempt to acquire the area of a polygon feature, I'm seeing some discrepancies between two methods and need some input. In the code below, I'm acquiring what I think is the area in 2 distinctive ways (parea1 and parea2):

prjpolygon = polygon.projectAs(outSr)
parea1 = prjpolygon.getArea()
parea2 = prjpolygon.area

The result:

parea1 Sqfeet : 21767057.9882
parea2 Sqfeet : 26642367.0

Why do these return different values? Which one do I use?

Re: arcpy.AsShape() Concerns with .getArea() and .area

WesMiller — Wed, 06 Jan 2016 16:11:31 GMT

You've probably already looked here Polygon—Help | ArcGIS for Desktop

area

(Read Only)

The area of a polygon feature. Empty for all other feature types.

Double

getArea ({type}, {units})

Returns the area of the feature using a measurement type.

Re: arcpy.AsShape() Concerns with .getArea() and .area

JamesCrandall — Sat, 11 Dec 2021 06:21:52 GMT

Thank you!

I had to cycle thru the types (planar was the ticket) to get these to produce identical results:

prjpolygon = polygon.projectAs(outSr)
parea1 = prjpolygon.getArea('PLANAR','Feet')
parea2 = prjpolygon.area

print "\t parea1 Sqfeet : {} ".format(parea1)
print "\t parea2 Sqfeet : {} ".format(parea2)

Results:
parea1 Sqfeet : 26642367.0
parea2 Sqfeet : 26642367.0