topic Working with Union in Python Questions

Working with Union

SebastianSieh — Mon, 26 Mar 2012 17:09:17 GMT

Hey everyone

i just started coding with pythonwin for ArcGis 10

and i got a question - iam trying to union 2 maps... if i try it in arcgis by hand its working fine but with python i get an error

import arcpy from arcpy import env  #Folder env.workspace="P:/workspace"  # file kreisumring and gemeinden at workspace folder  inCover="Kreisumring" unionCover="Gemeinden" outCover="P:/workspace/vereinigt" joinAttributes = "JOIN" arcpy.Union_arc(inCover, unionCover, outCover, "", joinAttributes)

Errors:

ERROR 000732: Input Coverage: Dataset kreisumring does not exist or is not supported ERROR 000732: Union Coverage: Dataset gemeinden does not exist or is not supported Failed to execute (Union).

existing files (for gemeinden aswell):
kreisumring.dbf
kreisumring.prj
kreisumring.sbn
kreisumring.sbx
kreisumring.shp

i searched alot... but didnt found something usefull - ofc i searched at desktop help 10. (as you can see 😛 )

thank you for any kind of help !

Re: Working with Union

JakeSkinner — Fri, 10 Dec 2021 20:39:12 GMT

Try specifying '.shp' for your input layers. Ex:

inCover="kreisumring.shp"
unionCover="gemeinden.shp"

Re: Working with Union

MathewCoyle — Mon, 26 Mar 2012 17:20:26 GMT

You need to specify they are shapefiles.

inCover="kreisumring.shp"
unionCover="gemeinden.shp"

Edit: Ah Jake beats me to it.

Re: Working with Union

SebastianSieh — Fri, 10 Dec 2021 20:39:15 GMT

Thanks for this fast replies !

Changed it and still "same" Errors

ERROR 000732: Input Coverage: Dataset Kreisumring.shp does not exist or is not supported
ERROR 000732: Union Coverage: Dataset Gemeinden.shp does not exist or is not supported
Failed to execute (Union).

Re: Working with Union

JakeSkinner — Mon, 26 Mar 2012 17:39:08 GMT

Looks like you are using the Union_arc tool, which is for coverages. Try the Union_analysis tool, which is for feature classes/shapefiles.

Re: Working with Union

MathewCoyle — Fri, 10 Dec 2021 20:39:17 GMT

Are those shapefiles in your workspace directory? Try setting the full path for these variables. And add a .shp to your output as well.

inCover="P:/workspace/Kreisumring.shp"
unionCover="P:/workspace/Gemeinden.shp"
outCover="P:/workspace/vereinigt.shp"

Edit: Jake again!

Re: Working with Union

SebastianSieh — Fri, 10 Dec 2021 20:39:20 GMT

Looks like you are using the Union_arc tool, which is for coverages. Try the Union_analysis tool, which is for feature classes/shapefiles.

Are those shapefiles in your workspace directory? Try setting the full path for these variables. And add a .shp to your output as well.
inCover="P:/workspace/Kreisumring.shp"
unionCover="P:/workspace/Gemeinden.shp"
outCover="P:/workspace/vereinigt.shp"
Edit: Jake again!

Thanks alot Guys !

finaly 😄

# Import the system modules
import arcpy
from arcpy import env
 
# Set the current workspace 
env.workspace = "P:/workspace"
 

# Union 3 feature classes carry all
inFeatures = ["Kreisumring.shp", "Gemeinden.shp", "Einzelgemeinden.shp"]
outFeatures = "alle"
clusterTol = 0.0000
arcpy.Union_analysis (inFeatures, outFeatures, "ALL", clusterTol)

Well iam not sure about clusterTol but i gonna read the Desktop Help article again !

Thanks again

#Problem solved