topic simple raster processing, fill with integer [python] in Geoprocessing Questions

simple raster processing, fill with integer [python]

HugoAhlenius — Tue, 16 Nov 2010 08:58:17 GMT

Hi, how do I just fill an extent with an integer value, like 1? I have defined cellsize and extent in the environment, but then I would like create a grid with all cells set to e.g. 1.

In ArcInfo Grid I would do:

newGrid = 1

Re: simple raster processing, fill with integer [python]

ChrisSnyder — Tue, 16 Nov 2010 16:22:18 GMT

In v9.3:

gp.extent = "0 0 1000 5000"
#or gp.extent = r"C:\temp\test.shp"
#optional gp.mask = r"C:\temp\test.shp"
gp.cellsize = "100"
# optional gp.snapraster = someOtherGrid
somaExp = "1"
outputGrd= r"C:\temp\test"
gp.SingleOutputMapAlgebra_sa (somaExp, outputGrd, "")

Re: simple raster processing, fill with integer [python]

DanPatterson_Retired — Tue, 16 Nov 2010 22:30:48 GMT

what version of ArcMap?
have you ruled out the raster calculator? (placed in different locations depending upon versions)
have you ruled out the Constant Raster Tool in ArcToolbox, which can also be implemented via Python.

Re: simple raster processing, fill with integer [python]

HugoAhlenius — Wed, 17 Nov 2010 07:39:41 GMT

This is ArcGIS 10 - and I didn't know about the Constant Raster tool - thanks for the pointer, although it seems like a convoluted way to do that!

Re: simple raster processing, fill with integer [python]

DanPatterson_Retired — Wed, 17 Nov 2010 11:17:20 GMT

there are some examples in the online help
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009z000000s4000000.htm