topic Adding multiple rasters together from a geodatabase - Getting AttributeError: 'str' object has no attribute 'write' in ArcGIS Pro Questions

Adding multiple rasters together from a geodatabase - Getting AttributeError: 'str' object has no attribute 'write'

GriogairMorrison — Sun, 30 Oct 2022 16:59:24 GMT

I have written a script for a custom tool that gets all the rasters from a geodatabase and then adds them all together.

import arcpy
from arcpy import env
from arcpy.sa import *

workspace = arcpy.GetParameter(0)

SuitabilityRaster = arcpy.GetParameterAsText(1)

rasters = arcpy.ListRasters()

for inRaster in rasters:
SuitabilityRaster = SuitabilityRaster + inRaster

SuitabilityRaster.write(workspace + "SuitabilityScoringGrid_Raster")

When I run the tool it gives the following error: AttributeError: 'str' object has no attribute 'write'

Would be grateful if someone could help explain this and provide a solution? The 'SuitabilityRaster' begins as a constant raster surface with the value of 0 and then 'rasters' is a list of the rasters from the geodatabase that should be sequentially added to the 'SuitabilityRaster' within the for loop.

Thanks.

Re: Adding multiple rasters together from a geodatabase - Getting AttributeError: 'str' object has no attribute 'write'

DanPatterson — Sun, 30 Oct 2022 19:40:41 GMT

do you want to 'save' the raster? or `print` it?

in either event ... (workspace + r"\SuitabilityScoringGrid_Raster")

would be needed

Re: Adding multiple rasters together from a geodatabase - Getting AttributeError: 'str' object has no attribute 'write'

Luke_Pinner — Mon, 31 Oct 2022 07:25:42 GMT

You're telling arcpy to give you the parameter as text i.e. a str object when you use GetParameterAsText.

You need a Raster object. Try using either:

#GetParameter SuitabilityRaster = arcpy.GetParameter(1)

# arcpy.Raster SuitabilityRaster = arcpy.Raster(arcpy.GetParameterAsText(1))

You'll also need to set the workspace:

arcpy.env.workspace = arcpy.GetParameter(0)

And possibly for convert inRaster to a Raster object as arcpy.ListRasters() returns strings

for inRaster in rasters: # you may need to convert inRaster to a Raster object # as arcpy.ListRasters() returns strings SuitabilityRaster = SuitabilityRaster + arcpy.Raster(inRaster)

So you'll end up with something like:

workspace = arcpy.GetParameterAsText(0) SuitabilityRaster = arcpy.Raster(arcpy.GetParameterAsText(1)) rasters = arcpy.ListRasters() for inRaster in rasters: SuitabilityRaster = SuitabilityRaster + arcpy.Raster(inRaster) SuitabilityRaster.write(workspace + "SuitabilityScoringGrid_Raster")