# calculate geometry values for specific fc type

Question asked by jwolff on May 12, 2016
Latest reply on May 13, 2016 by xander_bakker

Wasn't sure how to name this post...

I have a geodatabase with multiple feature datasets, each containing multiple feature classes of various polygon, line and point geometry type.  Every polygon fc has a 'areaSize' field that I need to populate with square feet (all of the fds are in State Plane feet).

I think I'm getting close here, but still getting an error.  (Eventually I will expand this to perform a similar calculation for length of line fc types as well.

The error I receive is attached.  Any help is greatly appreciated.

Thanks.

```#*********************************
#v1.0
#*********************************
import arcpy
from arcpy import env
import os

#Set variables
inputgdb = sys.argv[1]

#Set workspace
arcpy.env.workspace = inputgdb

#populate areaSize fields in polygon feature classes
datasetList = arcpy.ListDatasets(feature_type = 'feature')
datasetList = [''] + datasetList if datasetList is not None else []
print "Getting Feature Datasets..."
print datasetList

for dataset in datasetList:
env.workspace = inputgdb + "\\" + dataset
dataset = dataset + "\\"
fcList = arcpy.ListFeatureClasses('*', 'polygon', '*')
print "Getting Feature Classes..."
print "Feature Class list..."

for fc in fcList:
fc = fc +"\\"
fieldList = [f.name for f in arcpy.ListFields(fc, "areaSize")]
with arcpy.da.UpdateCursor (fc, fieldList) as cursor:
for row in cursor:
row[1] = row[0].area
cursor.updateRow(row)
print "Updating 'areaSize' field in: " + fc
arcpy.AddMessage ("Updating 'areaSize' field in: " + fc)

```