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distributing randomly a value into a raster image
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bluehery
Nov 23, 2009, 6:28:32 AM11/23/09
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Hi people,
here is the problem : I want to distribute randomly into a blank
raster image a set amount of value.
eg : I want to set 30% of the raster eigenvalue to 1 and the other 70%
should be left 0 or blank
I have at hand ArcGIS 9.2, ERDAS 9.2, and Idrisi taiga
thank you for your help
here is the problem : I want to distribute randomly into a blank
raster image a set amount of value.
eg : I want to set 30% of the raster eigenvalue to 1 and the other 70%
should be left 0 or blank
I have at hand ArcGIS 9.2, ERDAS 9.2, and Idrisi taiga
thank you for your help
jeanh
Nov 23, 2009, 10:08:46 AM11/23/09
to
Hi,
>eg : I want to set 30% of the raster eigenvalue to 1
raster value or raster eigenvalue?
for the former, in ArcGIS, go to Sptatial Analyst tools / raster
creation / create random raster. This will create a raster with values
between 0 and 1. Then do a reclassification: if data <= 0.3, new value =
1. If data >0.3 new value = 0
Jean
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