[GIS] ArcPy Raster Calculator error ” ‘str’ object has no attribute ‘save’ “

arcpyerror-000539raster-calculatorspatial-analyst

I converted a model into python script and tried to run it. It gave me an error when it gets to the raster calculator process.The message says "str" object has no attribute "save". See picture below.

My code here :

arcpy.gp.RasterCalculator_sa("\"%Reclass_Aspe5%\" + \"%Reclass_Slop7%\"", Output)

The expression: "%Reclass_Aspe5%" + "%Reclass_Slop7%"

The code it directly from ModelBuilder. Every other processes work out fine except raster calculator. Does anyone know what the problem is?

Error snippet:

ExecuteError: ERROR 000539: Error running expression: rcexec()
Traceback (most recent call last): File "", line 1, in
File "", line 8, in rcexec AttributeError: 'str'
object has no attribute 'save'

Failed to execute (RasterCalculator)

Best Answer

Per the Esri documentation, this tool is not available in arcpy scripting:

http://desktop.arcgis.com/en/arcmap/latest/tools/spatial-analyst-toolbox/raster-calculator.htm

Note: The Raster Calculator tool is intended for use in the application only as a GP tool dialog box or in ModelBuilder. It is not intended for use in scripting and is not available in the ArcPy Spatial Analyst module.

Another resource (GeoNet) suggests using Map Algebra: https://community.esri.com/thread/56655

Related Solutions

[GIS] Why does Raster Calculator (RasterCalculator_sa) give ERROR 000539 in ArcPy

From the ArcGIS Help:

Note: The Raster Calculator tool is intended for use in the ArcGIS for Desktop application only as a GP tool dialog box or in ModelBuilder. It is not intended for use in scripting and is not available in the ArcPy Spatial Analyst module.

That said, you can use it with arcpy.gp.RasterCalculator_sa, but you need to pass it a string expression, i.e. arcpy.gp.RasterCalculator_sa('Con(IsNull("somerasterlayer"), etc...)')

As suggested by @radouxju, you're better off using the map algebra syntax instead:

import arcview,arcpy
from arcpy.sa import *
rasterIn=Raster('path to raster')
rasterOut=Con(IsNull(rasterIn), FocalStatistics(rasterIn,NbrRectangle(3, 3), "MEAN"), rasterIn)
rasterOut.save("{0}yrSeemless.img".format(increment))

[GIS] Using Raster calculator in Modelbuilder ArcGis 10

Definitely need to rename your model elements so they don't have percent signs in the element name. That will definitely break the parsing in the raster calculator!

Note, the value of the element can have percent signs in it, but the element name/label cannot have percent signs.

Best Answer

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[GIS] Why does Raster Calculator (RasterCalculator_sa) give ERROR 000539 in ArcPy

[GIS] Using Raster calculator in Modelbuilder ArcGis 10

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