topic Re: error message at raster calculator in Python Questions

error message at raster calculator

GerryGabrisch — Fri, 11 May 2012 14:22:39 GMT

My Python code throws an error at the first raster calculator statement claiming that no cell size or extent are set. I don't see why this is necessary in this script but I put in some extent and cell size statements anyway. That didn't help, the code still throws the same error at the first raster calculator statement. Any help is welcomed.

try:
    import arcpy, os, sys, traceback
    from arcpy.sa import *
    
    arcpy.CheckOutExtension("Spatial")
  
    degreesSlope = Raster(r"C:\gtemp\FS_test\slope_degree")
    totalSoilThickness = Raster(r"C:\gtemp\FS_test\soildepth")
    saturatedSoilThickness = Raster(r"C:\gtemp\FS_test\dw")
    treeRootStrength = Raster(r"C:\gtemp\FS_test\rootcohesion")
    treeSurcharge = Raster(r"C:\gtemp\FS_test\surcharge")
    moistSoilUnitWeight = Raster(r"C:\gtemp\FS_test\moist_uw")
    numerator = "numerator"
    denominator = "denominator"
    
    #Constants...
    
    soilCohesion = 10.0
    effectiveInternalAngleofFriction = 10.0
    drySoilUnitWeight = 10.0
    
    saturatedSoilUnitWeight = 10.0
    waterUnitWeight = 10.0
    
    rastercalc = r"C:\gtemp\FS_test\dwrastercalc"
    
    arcpy.env.cellSize = "MAXOF"
    arcpy.env.extent = "MAXOF"
    
    
    arcpy.gp.RasterCalculator_sa((treeRootStrength + soilCohesion + Square(Cos(degreesSlope))*(treeSurcharge + moistSoilUnitWeight*(totalSoilThickness - saturatedSoilThickness)+ (saturatedSoilUnitWeight-waterUnitWeight)*saturatedSoilThickness)*Tan(effectiveInternalAngleofFriction)), numerator)

    arcpy.gp.RasterCalculator_sa((Sin(degreesSlope)*Cos(degreesSlope))*(treeSurcharge + moistSoilUnitWeight*(totalSoilThickness - saturatedSoilThickness) + drySoilUnitWeight * saturatedSoilThickness), denominator)
 
    arcpy.gp.RasterCalculator_sa(numerator/denominator, rastercalc )

    
    arcpy.AddMessage("Done!")
    
   
except arcpy.ExecuteError: 
    msgs = arcpy.GetMessages(2) 
    arcpy.AddError(msgs)  
    print msgs
except:
    tb = sys.exc_info()[2]
    tbinfo = traceback.format_tb(tb)[0]
    pymsg = "PYTHON ERRORS:\nTraceback info:\n" + tbinfo + "\nError Info:\n" + str(sys.exc_info()[1])
    msgs = "ArcPy ERRORS:\n" + arcpy.GetMessages(2) + "\n"
    arcpy.AddError(pymsg)
    arcpy.AddError(msgs)
    print pymsg + "\n"
    print msgs

Re: error message at raster calculator

JakeSkinner — Fri, 11 May 2012 14:45:26 GMT

Hi Gerry,

The Raster Calculator needs to be executed in Desktop or Model Builder. See here:

The Raster Calculator tool is intended for use in the ArcGIS 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.

You will want to use the Spatial Analyst 'Math' tools to perform your Raster calculations (i.e. Times, Plus, etc).

Re: error message at raster calculator

GerryGabrisch — Fri, 10 Dec 2021 22:52:07 GMT

OK, I removed the raster calculator functions from the script. According to the literature I can use raster calculator like expression (+,-,/...) as long as I cast the raster as 'rasters'. I can get something like the below to work without error, but I cant get passed 'numerator' in the code below without getting the cell size and extent not set error.
Raster("test1")
Raster(test2")
thesum = test1 + test2

try:
    import arcpy, os, sys, traceback
    from arcpy.sa import *
    from arcpy import env
    
    arcpy.CheckOutExtension("Spatial")
    
    arcpy.AddMessage("\n\nCalculate Slope Factor of Safety")
    
    #Grids
    
    degreesSlope = Raster(r"C:\gtemp\FS_test\slope_degree")
    totalSoilThickness = Raster(r"C:\gtemp\FS_test\soildepth")
    saturatedSoilThickness = Raster(r"C:\gtemp\FS_test\dw")
    treeRootStrength = Raster(r"C:\gtemp\FS_test\rootcohesion")
    treeSurcharge = Raster(r"C:\gtemp\FS_test\surcharge")
    moistSoilUnitWeight = Raster(r"C:\gtemp\FS_test\moist_uw")
    numerator = "numerator"
    denominator = "denominator"
    result = "result"
    
    #Constants...
    
    soilCohesion = 10.0
    effectiveInternalAngleofFriction = 10.0
    drySoilUnitWeight = 10.0
    
    saturatedSoilUnitWeight = 10.0
    waterUnitWeight = 10.0
    
    rastercalc = r"C:\gtemp\FS_test\dwrastercalc"
    
    arcpy.env.cellSize = "MAXOF"
    arcpy.env.extent = "MAXOF"
    
    numerator =((treeRootStrength + soilCohesion + Square(Cos(degreesSlope))*(treeSurcharge + moistSoilUnitWeight*(totalSoilThickness - saturatedSoilThickness)+ (saturatedSoilUnitWeight-waterUnitWeight)*saturatedSoilThickness)*Tan(effectiveInternalAngleofFriction)))

    denominator =((Sin(degreesSlope)*Cos(degreesSlope))*(treeSurcharge + moistSoilUnitWeight*(totalSoilThickness - saturatedSoilThickness) + drySoilUnitWeight * saturatedSoilThickness), denominator)
 
    result =(numerator/denominator)
    result.save(rastercalc)
    
    # Process: Raster Calculator
    #arcpy.gp.RasterCalculator_sa("treeRootStrength + soilCohesion + Square(Cos(degreesSlope))*(treeSurcharge + moistSoilUnitWeight*(totalSoilThickness - saturatedSoilThickness)+ (saturatedSoilUnitWeigh-waterUnitWeight)*saturatedSoilThickness)*Tan(effectiveInternalAngleofFriction))/((Sin(degreesSlope)*Cos(degreesSlope))*(treeSurcharge + moistSoilUnitWeight*(totalSoilThickness - saturatedSoilThickness) + drySoilUnitWeight * saturatedSoilThickness))", rastercalc)

    arcpy.AddMessage("Done!")
    
except arcpy.ExecuteError: 
    msgs = arcpy.GetMessages(2) 
    arcpy.AddError(msgs)  
    print msgs
except:
    tb = sys.exc_info()[2]
    tbinfo = traceback.format_tb(tb)[0]
    pymsg = "PYTHON ERRORS:\nTraceback info:\n" + tbinfo + "\nError Info:\n" + str(sys.exc_info()[1])
    msgs = "ArcPy ERRORS:\n" + arcpy.GetMessages(2) + "\n"
    arcpy.AddError(pymsg)
    arcpy.AddError(msgs)
    print pymsg + "\n"
    print msgs

Re: error message at raster calculator

curtvprice — Fri, 10 Dec 2021 22:52:10 GMT

OK, I removed the raster calculator functions from the script. According to the literature I can use raster calculator like expression (+,-,/...) as long as I cast the raster as 'rasters'. I can get something like the below to work without error, but I cant get passed 'numerator' in the code below without getting the cell size and extent not set error.

Both you and the parser will have a better chance of getting it right (or at least isolate the issues) if you break this up into smaller chunks.

x1 =treeRootStrength + soilCohesion 
x2 = Square(Cos(degreesSlope)) * treeSurcharge + moistSoilUnitWeight * (totalSoilThickness - saturatedSoilThickness)
...

I've found this help article very, uh, helpful:

Building" rel="nofollow" target="_blank">http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//00p60000000p000000.htm]Building Complex Statements

Re: error message at raster calculator

JakeSkinner — Fri, 11 May 2012 18:21:48 GMT

It looks like there may be a bug with "MAXOF" & "MINOF" properties. I tested this and always received a Runtime Error:

RuntimeError: No CellSize and Extent set

If you set the 'arcpy.env.cellSize' and 'arcpy.env.extent' to a raster, or to a constant (i.e. 10) the code should work. You may want to report this issue to Tech Support.

Re: error message at raster calculator

GerryGabrisch — Fri, 11 May 2012 18:38:21 GMT

Thanks, Jake. Setting the env properties to a grid worked.

Re: error message at raster calculator

GerryGabrisch — Fri, 10 Dec 2021 22:52:11 GMT

Now that I got my tool running as a standalone script I set it to work as an ArcToolbox tool. It throws an error at line 62 (numerator) where the standalone does not...looks line another bug.

Error Info:
ERROR 000824: The tool is not licensed.
ArcPy ERRORS:

try:
    import arcpy, os, sys, traceback
    from arcpy.sa import *
    from arcpy import env
    
    arcpy.SetProduct("ArcInfo")
    arcpy.CheckOutExtension("Spatial")
    
    arcpy.AddMessage("\n\nCalculate Slope Factor of Safety")
    arcpy.AddMessage("beta by Gerry Gabrisch, 5-4-2012")
    
    #Get input parameters using ArcToolbox tool
    degreesSlope = arcpy.GetParameterAsText(0)
    totalSoilThickness = arcpy.GetParameterAsText(1)
    saturatedSoilThickness = arcpy.GetParameterAsText(2)
    treeRootStrength = arcpy.GetParameterAsText(3)
    treeSurcharge = arcpy.GetParameterAsText(4)
    soilCohesion = float(arcpy.GetParameterAsText(5))
    effectiveInternalAngleofFriction = float(arcpy.GetParameterAsText(6))
    drySoilUnitWeight = float(arcpy.GetParameterAsText(7))
    moistSoilUnitWeight = arcpy.GetParameterAsText(8)
    saturatedSoilUnitWeight = float(arcpy.GetParameterAsText(9))
    waterUnitWeight = float(arcpy.GetParameterAsText(10))
    
    rastercalc = arcpy.GetParameterAsText(11)
    
    ##Use For hardcoding
    ##Grids
    #degreesSlope = r"C:\gtemp\FS_test\slope_degree"
    #totalSoilThickness = r"C:\gtemp\FS_test\soildepth"
    #saturatedSoilThickness = r"C:\gtemp\FS_test\dw"
    #treeRootStrength = r"C:\gtemp\FS_test\rootcohesion"
    #treeSurcharge = r"C:\gtemp\FS_test\surcharge"
    #moistSoilUnitWeight = r"C:\gtemp\FS_test\moist_uw"
    ##Constants...
    #soilCohesion = 10.0
    #effectiveInternalAngleofFriction = 10.0
    #drySoilUnitWeight = 10.0
    #saturatedSoilUnitWeight = 10.0
    #waterUnitWeight = 10.0
    
    
    #Set the output cell size,  mask, and cell registration...
    arcpy.env.cellSize = degreesSlope
    arcpy.env.extent = degreesSlope
    arcpy.env.snapeRaster = degreesSlope
    
    
    #Cast input rasters to in-memory raster layers...
    degreesSlope = Raster(degreesSlope)
    totalSoilThickness = Raster(totalSoilThickness)
    saturatedSoilThickness = Raster(saturatedSoilThickness)
    treeRootStrength = Raster(treeRootStrength)
    treeSurcharge = Raster(treeSurcharge)
    moistSoilUnitWeight = Raster(moistSoilUnitWeight)
    
    numerator = "numerator"
    denominator = "denominator"
    result = "result"
     
    
    numerator =(treeRootStrength + soilCohesion + Square(Cos(degreesSlope))*(treeSurcharge + moistSoilUnitWeight*(totalSoilThickness - saturatedSoilThickness)+ (saturatedSoilUnitWeight-waterUnitWeight)*saturatedSoilThickness)*Tan(effectiveInternalAngleofFriction))
    
    denominator =((Sin(degreesSlope)*Cos(degreesSlope))*(treeSurcharge + moistSoilUnitWeight*(totalSoilThickness - saturatedSoilThickness) + drySoilUnitWeight * saturatedSoilThickness))
    #Do the last division....
    result = numerator/denominator
    #Save the in-memory results to disk...
    result.save(rastercalc)

    arcpy.AddMessage("Done!")
#Catch ESRI errors here...  
except arcpy.ExecuteError: 
    msgs = arcpy.GetMessages(2) 
    arcpy.AddError(msgs)  
    print msgs
#Catch Python errors here...
except:
    tb = sys.exc_info()[2]
    tbinfo = traceback.format_tb(tb)[0]
    pymsg = "PYTHON ERRORS:\nTraceback info:\n" + tbinfo + "\nError Info:\n" + str(sys.exc_info()[1])
    msgs = "ArcPy ERRORS:\n" + arcpy.GetMessages(2) + "\n"
    arcpy.AddError(pymsg)
    arcpy.AddError(msgs)
    print pymsg + "\n"
    print msgs