I'm trying to run the MosaicToNewRaster tool as part of a python script. This is my code:

input_rasters = arcpy.GetParameterAsText(5), arcpy.GetParameterAsText(6), arcpy.GetParameterAsText(7), arcpy.GetParameterAsText(8)
output_location = "C:/Birkbeck_Python/Prog_Assign_1.gdb"
arcpy.MosaicToNewRaster_management(input_rasters, output_location, "R_Dataset", "", "",    "", "1", "", "")

I get the following error message, anybody got any ideas? It works fine when I hardcode it.


ExecuteError: Failed to execute. Parameters are not valid. ERROR 000732: Input Rasters: Dataset '';'';'';'' does not exist or is not supported Failed to execute (MosaicToNewRaster).


You need to create a raster list rather than a series of paths separated by commas. Try something like the following:

input_rasters = arcpy.GetParameterAsText(0)
output_location = "C:/Birkbeck_Python/Prog_Assign_1.gdb"
arcpy.MosaicToNewRaster_management(input_rasters, output_location, "R_Dataset", "", "",    "", "1", "", "")

Then you can add a multivalue raster dataset when you produce the script tool, as follows:

enter image description here

  • THanks @Aaron, I tried what you said but now it's saying: 'ExecuteError: Failed to execute. Parameters are not valid. ERROR 000735: Input Rasters: Value is required Failed to execute (MosaicToNewRaster).' Any ideas? – Dunuts Jul 27 '13 at 22:39
  • From the help page @Luke linked to: "The input raster datasets are all the raster datasets you would like to mosaic together. The inputs must have the same number of bands and same bit depth; otherwise, the tool will exit with an error message." – Aaron Jul 27 '13 at 23:32
  • I'm 100% sure they're all the same depth etc. I can get it to work perfectly when I hardcode everthing! It's just not recognising the rasters in the workspace! – Dunuts Jul 28 '13 at 9:59

You need to pass a semicolon separated string instead of a list/tuple.

input_rasters = ';'.join((arcpy.GetParameterAsText(5), arcpy.GetParameterAsText(6), arcpy.GetParameterAsText(7), arcpy.GetParameterAsText(8)))
output_location = "C:/Birkbeck_Python/Prog_Assign_1.gdb"
arcpy.MosaicToNewRaster_management(input_rasters, output_location, "R_Dataset", "", "",    "", "1", "", "")
  • Thanks, after I change it to the above do I use multivalue rasters in my script tool? – Dunuts Jul 27 '13 at 22:45
  • I tried the above with a multivalue raster input and it gave me the same error as I was getting: 'ExecuteError: Failed to execute. Parameters are not valid. ERROR 000735: Input Rasters: Value is required Failed to execute (MosaicToNewRaster).' Any advice appreciated. – Dunuts Jul 27 '13 at 22:48
  • @Dunuts: no, if you use a multivalue parameter, arcpy.GetParameterAsText(parameter number) will return a semicolon separated string – user2856 Jul 28 '13 at 1:11

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