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Graduated symbology of raster. How to round maximum value (automated)

Anonymous User

Original User: colinmurray

Hello
I'd like to know if there's a way to automate rounding the maximum value for a raster when rendered in Stretched values along the colour ramp.

The value default is to 3 decimal places but I'd like it rounded to a whole number for aesthetic reasons.

I know how to do this manually. However the number of rasters I have to do this to is rather large and so I'd like to automate the process. Please see below images of before and after for what I want.

[ATTACH=CONFIG]30061[/ATTACH]
[ATTACH=CONFIG]30062[/ATTACH]

Thank you
Colin

Raster Label Round Before.png

Raster Label Round After.png

_MG_2659 (2).JPG

Danieldu_Pre1_0-1636377839179.png

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Accepted answers

JeffreyBarrette

Stretched is currently not supported via arcpy.mapping.

Jeff

All comments

JeffreyBarrette

Have you tried using arcpy.mapping. Here is an example from the help that demonstrates how to set the values and labels.

import arcpy
mxd = arcpy.mapping.MapDocument(r"C:\Project\Project.mxd")
df = arcpy.mapping.ListDataFrames(mxd, "Census")[0]
lyr = arcpy.mapping.ListLayers(mxd, "StatePopulation", df)[0]
lyrFile = arcpy.mapping.Layer(r"C:\Project\LYRs\Population.lyr")
arcpy.mapping.UpdateLayer(df, lyr, lyrFile, True)
if lyr.symbologyType == "GRADUATED_SYMBOLS":
  lyr.symbology.valueField = "POP2000"
  lyr.symbology.classBreakValues = [250000, 999999, 4999999, 9999999, 35000000]
  lyr.symbology.classBreakLabels = ["250,000 to 999,999", "1,000,000 to 4,999,999", 
                                    "5,000,000 to 9,999,999", "10,000,000 to 35,000,000"]
arcpy.mapping.ExportToPDF(mxd, r"C:\Project\Output\StatePopulation.pdf")
del mxd, lyrFile

Jeff

Anonymous User

Original User: colinmurray

Arc.py.mapping is what I'm using. And I must say it's pretty sweet once I broke the code.

What you've suggested seems to work when creating class breaks but I don't see a similar function to apply to stretched values as I have decided to use. You can see from the screen clip (showing the layer properties box) that I can manually change the Label to round off to 4915 from 4915.29. How to do this via automation?
Thank you for the response.

[ATTACH=CONFIG]30133[/ATTACH]

Raster stretched values label.png

JeffreyBarrette

Stretched is currently not supported via arcpy.mapping.

Jeff

Anonymous User

Original User: colinmurray

Thank you for letting me know.
Cheers
Colin

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