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I have the following script:

#Import ArcPy site package import arcpy from arcpy import env from arcpy import Raster from arcpy.sa import ZonalStatistics from arcpy.sa import CreateConstantRaster # Set Environment Workspace ws = env.workspace = "MY_WORKSPACE_PATH\\FGD.gdb" # Set Environment Raster Cell Size env.cellSize = 10 # Check out ArcGIS Spatial Analyst extension license arcpy.CheckOutExtension("Spatial") # Get Parameters as Text rasters = arcpy.GetParameterAsText(0) inputRasters = rasters.split(";") inZoneData = arcpy.GetParameterAsText(1) zoneField = arcpy.GetParameterAsText(2) # The constant raster = 0 addedRaster = CreateConstantRaster(0) # Process each raster string for raster in inputRasters: addedRaster = addedRaster + Raster(ws + "\\" + raster) # Execute Zonal Statistics zoneStats = ZonalStatistics(inZoneData, zoneField, addedRaster, "MAXIMUM", "DATA") # Save the output zoneStats.save(ws + "\\" + NewTest_12102011")

I have imported the script as a script tool in ArcMap, my parameters are in the correct order and have the correct attributes (this script works when I have, for example, just two raster inputs as parameters). The input rasters are referenced as a String (this tool will eventually be used as a Geoprocessing Task, so I cannot use rasters a input directly). The problem I have is that when I open the tool, there is no way for me to input anything into the first parameter.

enter image description here

To provide some clarity: each value that could be entered into the parameter would be the name of a raster inside the geodatabase. For instance, say the user enters "rasterOne" and "rasterTwo". This would refer to MY_WORKSPACE_PATH\FGD.gdc\rasterOne and MY_WORKSPACE_PATH\FGD.gdc\rasterTwo, which are then cast to a Raster object with 

Raster("MY_WORKSPACE_PATH\\FGD.gdc\\rasterOne")

Any suggestions would be great. Thanks.

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  • Have you ruled out the ListRasters method as shown in the online help topic? help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//… Commented Dec 12, 2011 at 14:56
  • @DanPatterson I have ruled that out. I don't want to input every raster in the work space/GDB, nor provide a list of available rasters. As mentioned, this will eventually be a Geoprocessing Task running on ArcServer. In a Flex application, a user would select a check box with a corresponding ID attribute. This ID attribute would correspond to a raster in the GDB, say id="rasterOne". This is pushed into an array and provided as a parameter in execute/submitJob. The array might be params = ["rasterOne", "rasterTwo"]. Similar to this example: Commented Dec 12, 2011 at 15:06
  • @DanPatterson example link: help.arcgis.com/en/webapi/flex/samples/index.html#/… Commented Dec 12, 2011 at 15:07
  • Not sure about Flex, but in arctoolbox you can provide a Filter option, which defaults to None, if you specify Value List, you could put the names of the rasters in there and they should show in a checklist form (if memory serves). Commented Dec 12, 2011 at 15:36
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    Really frustrating, this is STILL a bug 7 years later at version 10.6! Commented Feb 16, 2018 at 19:57

3 Answers 3

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In addition to the above comments, I will show what this simple script and the toolbox with a filter list allows and you can decide if that is the desired outcome. The following script

import arcpy selected= arcpy.GetParameterAsText(0) arcpy.AddMessage("\nselected data " + str(selected) + "\n")

was added to a toolbox with one multivalue parameter with values provided to be selected. The following image shows the input stage with 3 string values selected (eg names of input data for example) multivalue selection

The following is the output.

Executing: Multiparameter first;second;third Start Time: Mon Dec 12 10:57:45 2011 Running script Multiparameter... selected data first;second;third Completed script Multiparameter... Succeeded at Mon Dec 12 10:57:45 2011 (Elapsed Time: 0.00 seconds)

Not sure if that helps, but it might useful for other posts.

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    +1 Thanks for the visual example. Did you provide the values through the Import Script Tool or in the script itself?\ Commented Dec 12, 2011 at 17:27
  • When defining the tool parameters, the "Filter" option allows you to switch from None to a Value List and you can enter the values there. You may be able to use SetParameterAsText to define them within a script, but I haven't played with that option. Commented Dec 12, 2011 at 17:52
  • Your suggestion worked and I found where to input those values. Thanks Commented Dec 17, 2011 at 20:46
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Looks like a bug in arcmap to me. You could just take a single-value string input, comma separated, and split it:

list_of_strings = arcpy.GetParameterAsText(0).split(',')
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  • That's how I originally had the code (I took it from the Clip and Ship tutorial data, but when I opened the script they used in the model it was from 9.3, and I am running 10.0). Even so, shouldn't it work just the same the way I have it now? Or would you recommend removing the extra variable and just adding it to the end of 'rasters'? Commented Dec 12, 2011 at 15:48
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I have found the following workflow to work:

  1. Create a model and drag my script tool into it.
  2. Create a variable, and check the "Multivalue" checkbox.
  3. Link the variable and the script tool with the connector tool, and choose for it to be a parameter from the script tool, i.e. in my case a string of rasters

enter image description here

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