I am attempting to create in ArcGIS 10.3 a Modelbuilder code based partially on that in Using raster calculator in ModelBuilder to batch reclassify hundreds of rasters? My code will run through 70+ rasters of different sizes, raster calc them from meters to feet, place them in a specific directory, and eventually iterate both a polygon from raster boundary, two separate contour maps, and add a field and an attribute to each of the polygon boundaries. However, I am encountering a problem in just creating the Raster Calculator iteration.

Here is my Modelbuilder as currently drafted: Modelbuilder Layout

Its code:

# Import arcpy module
import arcpy

# Load required toolboxes
arcpy.ImportToolbox("Model Functions")

# Script arguments
Test_Group = arcpy.GetParameterAsText(0)
if Test_Group == '#' or not Test_Group:
Test_Group = "N:\\Planning And Development\\Engineering\\Systemwide GIS\\Geodatabases\\Comprehensive\\Test Group" # provide a default value if unspecified

# Local variables:
Name = "USGS_NED_one_meter_x46y443_CO_SoPlatteRiver_Lot5_2013_IMG_2015.img"
feet__Name_ = "N:\\Planning And Development\\Engineering\\Systemwide GIS\\Geodatabases\\TestOutput\\feet_%Name%"
Raster = "N:\\Planning And Development\\Engineering\\Systemwide GIS\\Geodatabases\\Comprehensive\\Test Group\\USGS_NED_one_meter_x46y443_CO_SoPlatteRiver_Lot5_2013_IMG_2015.img"
Value = "USGS_NED_one_meter_x46y443_CO_SoPlatteRiver_Lot5_2013_IMG_2015.img"

# Process: Iterate Rasters
arcpy.IterateRasters_mb(Test_Group, "", "", "RECURSIVE")

# Process: Raster Calculator
arcpy.gp.RasterCalculator_sa("\"%Name%\" *  3.28", feet__Name_)

# Process: Parse Path
arcpy.ParsePath_mb(Raster, "FILE")

Here is the Raster Calculator setup (ignore the error message, that was after I ran through an iteration): RasterCalculator

Output comes out like this: B/W output

Strangely if I run an individual instance of Raster Calculator, it comes out in greyscale as normal. However, with 70+ rasters I don't want to do one at a time especially since I want to automate other tasks after I have solved this error.

Where am I going wrong?

  • Have you checked out if the calculated raster values (just one sample each, model builder and manual) are the same?
    – fatih_dur
    Commented Sep 10, 2016 at 8:08
  • Both the manual and the MB calculations have the same range output. Is there any other way to check the values? Commented Sep 12, 2016 at 14:25
  • Here is a picture of the two. Feet_ is the modelbuilder execution, Feet2_ was an independent Raster Calculator session: imgur.com/Wb7t46B Commented Sep 12, 2016 at 20:40

1 Answer 1


After your comments, I think your issue is related to not having a histogram to show your raster as desired. If you add Calculate Statistics tool after Raster Calculator output, you should be able to see them rendered correctly.

  • I attempted this, with a CS tool running after RC as recommended, and it produces the same output as without the CS tool. Also, I noticed this interesting characteristic. The input are wildly different sizes, but the input both came out in the same file size: Input Output Commented Sep 13, 2016 at 15:08

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