Adding Together Rasters

Anonymous User

Original User: Kenyon07

Hi,
I am trying to add together a bunch or rasters (about 300), and I know of no way other than using the raster calculater to do this. (Ex. [RASHFT0.tif] + [RASHFT0.tif] + [RASHFT0.tif] )

But this seems not to work. How can I truely add together all of these rasters?

Attached is a text file that I put the values into the raster calculator to do the calculation (Adding.txt) and also a picture of my screen(Calculation.jpg). The calculation shows values in the TOC but returns NoData.

Calculation.jpg

Adding.txt.zip

Anonymous User

Original User: susanwitherly

Have you tried adding just a few of your rasters together using the raster calculator? Might give you a sense of whether the problem is an extent issue or a format problem? There might be a limit to how much text the raster calculator can handle. Try using a script such as:

import arcpy
intCount = 0

MainWS = "C:\GISProj\RasterData"
from arcpy import env
from arcpy.sa import *
env.workspace = MainWS
arcpy.CheckOutExtension("Spatial")
print intCount
rasterList = arcpy.ListRasters()
for raster in rasterList:
      print raster
      if intCount == 0:
            output = raster
            intCount = intCount + 1           
            print output
      else:
            intCount = intCount + 1
            output = arcpy.sa.Plus(output, raster)
output.save("C:\GISProj\Workspace\Processing.gdb\output")
print "Total Number of Rasters: " + str(intCount)

Note the loss of indentation in the python code!