1

I am doing the work of change all null pixels to a value of -1 in the raster file X with raster calculator by using following syntax:

Con(IsNull("X"),-1,"X")

However, I need to do the same work on >200 raster files. Is there any other method so that I can do these works simply?

2

ModelBuilder is all that you need.

You have to loop through your layers with iterator (Iterate Rasters).

2

You can automate this using Python and the Con (Spatial Analyst) function.

import arcpy
from arcpy.sa import *
arcpy.CheckOutExtension = "Spatial"

arcpy.env.workspace = "C:/temp/data"
outws = "C:/temp/out"

rasters = arcpy.ListRasters()

for r in rasters:
    inras = Raster(r)
    outCon = Con(IsNull(inRas), -1, inRas)
    outCon.save(os.path.join(outws, r))

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