Nested statements with Con Error

KathleenHoenke

I'm trying to get this short con statement to work. In the comments was the previous author's code, but that didn't work for me so I changed it, and am getting an error (below). Any help is appreciated!

 

File "<string>", line 32, in <module>
File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\sa\Functions.py", line 1631, in Con
where_clause)
File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\sa\Utils.py", line 53, in swapper
result = wrapper(*args, **kwargs)
File "C:\Program Files\ArcGIS\Pro\Resources\ArcPy\arcpy\sa\Functions.py", line 1615, in Wrapper
["IfThen", in_conditional_raster, in_true_raster_or_constant])
RuntimeError: The parameter is incorrect.

 

 

outcon = Con((Newflowdir ==1,1, Con(Newflowdir == 64,1, Con(Newflowdir ==16,1, Con(Newflowdir ==4,1)))),1.41421356237)
outcon.save(r'E:\NC Lidar NEW 03052021\SARP_NCGS_Data_Share_cms20210305\LiDar\knickpoints\dxraster.tif')

 

 

TomaszTARCHALSKI1

Hello,

I  can suggest different approach to your question, but firstly, one error is comming from that you are trying to assign float (1.43...) and your raster might accept only integer...

as, your con expresion is quite complex, how about using 'raster-cell-iterator'  and raster_info.

For example sth like this:

from arcpy.sa import *

myRas = Raster(r"C:\Temp\flow_direction_raster")
#get raster information
rasInfo = myRas.getRasterInfo()
#get pixel type
print(rasInfo.getPixelType())

#in rasinfo object change one parameter - pixel type
rasInfo.setPixelType("F32")
# now create new, empty raster, but with defined extent, pixel type...
new_raster = Raster(rasInfo)

#run calculation to update values to new raster
with RasterCellIterator({'rasters':[myRas, new_raster]}) as rci:
    for i,j in rci:
        if myRas[i,j] in [1, 64, 16, 4]:
            new_raster[i,j] = 1
        else:
            new_raster[i,j] = 1.41421356237

# save new raster to your disk
new_raster.save(r'C:\Temp\test')