I have created a code in Python that I will use for a custom tool in ArcGIS, the code will create a Eucledian Distance of 6000m around a point and Reclassify the distance from 0-2000, 2000-4000, 4000-6000. The code works but what I was wondering was, is there a bit of code I can add on to make the 0-2000 area red, the 2000-4000 area to be orange and the 4000-6000 area to be yellow. As the code stands the colours are random i guess (blue, green etc.). I have been looking through a few books but could not find a solution.

from arcpy import env
from arcpy.sa import *

# Set environment settings
arcpy.env.workspace = "Z:\\GIS TEST\\Select_by_Location"

# Check out any necessary licenses

# Local variables:
Breakout_Location = "Breakout_Location.shp"
maxDistance = "6000"
Output_direction_raster = "Z:\\GIS TEST\\Codes\\Output"

# Set Extents
arcpy.env.extent = arcpy.Extent(31652.290929,28102.389486,269652.513962,212966.447186)

if arcpy.Exists(Output_direction_raster):
Euc_Dist1=EucDistance(Breakout_Location, 6000, 400, Output_direction_raster)

# Process: Reclassify
Reclass_Output_direction_raster = Reclassify(Euc_Dist1, "Value", RemapRange([[0,2000,1],[2000,4000,2],[4000,6000,3]]), "DATA")

arcpy.SetParameterAsText(0, Breakout_Location)

Reclass_Output_direction_raster.save("Z:\\GIS TEST\\Codes\\Output")
  • I've researched this before from what I have gathered ESRI didnt include this capability in arcpy.mapping because they didnt want to "bloat it" from what I understand they want to keep this as a ArcObjects functionality. I have wished on many occasions that there were more options for Symbology alterations within arcpy. refer to this post: forums.arcgis.com/threads/44502-Managing-Symbology-using-Python Jan 8 '14 at 17:24
  • 1
    As a work around you could create a "template" layer with the symbology you desire and use it as a style referance with the applysymbologyfromlayer tool. I'm sure someone will post a more detailed explanation of this work around. Jan 8 '14 at 17:30

I recently ran into this limitation when creating an esri addin toolbar. I was limited to the option that Chris R mentioned, creating and saving a template layer with my python code. It was fairly simple and works remarkably well.

To not hard code the path to the symbology layer, I used os.path to get the path of the layer saved with the python code...

import os
Temp_Symbology = os.path.join(os.path.dirname(os.path.abspath(__file__)), 'Symbology_Template.lyr')

Add raster to TOC

mxd = arcpy.mapping.MapDocument('current')
df = arcpy.mapping.ListDataFrames(mxd)[0]
add_layer = arcpy.mapping.Layer(Output_direction_raster)
arcpy.mapping.AddLayer(df, add_layer, "TOP")
reclass_raster_lyr = arcpy.mapping.ListLayers(mxd)[0]

Then apply the symbology and refresh active view...

# Apply symbology from .lyr file
arcpy.ApplySymbologyFromLayer_management(reclass_raster_lyr, Temp_Symbology)

One option would be to create a color map file (.clr) you can reference in your script. Then it is simply a matter of using Add Colormap (Data Management) to assign your color map to the raster layer:

arcpy.AddColormap_management (in_raster, {in_template_raster}, {input_CLR_file})

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