AnsweredAssumed Answered

Problem with raster Reclassify in python script

Question asked by rastrauch Champion on Nov 3, 2015
Latest reply on Nov 3, 2015 by Dan_Patterson

Cross posting: Python


I'm writing a python tool that given a elevation raster (elevation value in meters), converts to a "raster object" with elevation value in feet. I then create a variable based on elevation Range provided be the user to be used with the Reclassify command as a RemapRange.  The result of this Reclassify (and maybe one other step eventually) will be input to RasterToPolygon


I've included a very simplified version of the code I have,

The out value of my reclassArg is

     [[327.850126532, 1000, 1000], [1000,  2000,  2000], [ 2000,  3000,  3000], [ 3000, 6500, 6500]]

But I have also tried  version     such as

     327.850126532 1000 1000; 1000  2000  2000;  2000  3000  3000;  3000 6500 6500

and all different variations of the two, based on the "results" snippet, and various help docs.



I've tried quite a few different commands and versions of the reclassArg, with the last being from the local ArcGIS 10.3 tool help


But my output raster keeps come out with a single value 127.   Full disclosure, before I tried

     outDEMtmp = Reclassify(elevFeet, "Value", RemapRange("{0}".format(reclassArg)), "NODATA")


     outDEMtmp =, "Value", RemapRange("{0}".format(reclassArg)), "NODATA")

and even, "Value", reclassArg, outDEMtmp, "NODATA")


The first two (using the [[ ]] list as reclassArg)  finishes without an erro, but all values are are "127"

The third option is not reclassifying anything.


I admit my spatial analyst skills are very rusty, and the raster-object concept is new (all though similar to the old GRID), but I'm running out of ideas to try, other than running the tools manually.  Any help or a good resource on scripting the Reclassify tool would be helpful.

Using 10.3, ArcInfo/Advanced and Spatial Analyst (I have access to 3D if needed).


import os
import arcpy
from arcpy import env
from import *


theWorkspace = r"C:\_beartest\Prep.gdb"
arcpy.env.workspace = theWorkspace
arcpy.env.overwriteOutput = True
wsPath, wsGDB = os.path.split(theWorkspace)

rasterIn = r"C:\_beartest\Unit20Araster.gdb\elevClip"

toElevFeet = 3.280839895013123

elevFeet = (Raster(rasterIn) * toElevFeet)
elevMinimum = elevFeet.minimum

elevCutoffFt = "6500"
flatElevBreak = ("1000; 2000; 3000")

# processing the elevation and high-cuttoff variables to create reclass arguments
elevSplit = flatElevBreak.split(";")
lstCnt = 1
for reclassValue in elevSplit:
    print("Reclass value:{0} ft".format(reclassValue))
    if lstCnt == 1:
        reclassArg = ("[[{0}, {1}, {2}]".format(elevMinimum, reclassValue, ("{0}".format(reclassValue))))
        reclassArg = ("{0}, [{1}, {2}, {3}]".format(reclassArg, prevValue, reclassValue, ("{0}".format(reclassValue))))
    lstCnt += 1
    prevValue = reclassValue
reclassArg = ("{0}, [{1}, {2}, {3}]]".format(reclassArg, prevValue, elevCutoffFt, ("{0}".format(elevCutoffFt))))

outDEMtmp =, "Value", RemapRange("{0}".format(reclassArg)), "NODATA")

#arcpy.RasterToPolygon_conversion(outDEMtmp, "reclassPoly", "SIMPLIFY", "VALUE")




Suggestions would be greatly appreciated.  Thanks


EDIT: added line 18 which was missing.


Message was edited by: Rebecca Strauch, GISP EDIT: added line 18 which was missing.