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I have a raster dataset in ArcGIS displaying altitude.

I want to replace all values < 8 with value 8.

Other values have to stay the same. How can I do this?

I tried raster calculator, but I don't seem to get the expression right.

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2 Answers 2

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With the raster calculator, you can use the Con() statement(condiotion, value if true, value if false)

Con("raster" < 8 , 8, "raster")
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# Import system modules   
import arcpy
from arcpy import env
from arcpy.sa import *

# Set environment settings
env.workspace = "C:/project/input/data"

# Execute Con
outCon = Con("altitude" < 8, 8, "altitude")

# Save the outputs 
outCon.save("C:/project/output/output.img")

References:

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