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Raster Calculator in Arcmap Desktop Python Script

MudassarAli2

Dear All

I have a model builder in ARCMap desktop 10.5 which is executing fine. I have converted it to python script to make a batch script. But at the last step, where I am using raster calculator in model builder, getting an error. The line is

arcpy.gp.RasterCalculator_sa(constant_raster * float(value), rastercalc)

(where value is a variable and constant_raster is a raster dataset)

From the link Raster Calculator—Help | ArcGIS for Desktop I came to know that RasterCalculator only function in model builder.

Is it any other wayaround that I could implement the raster calculator in my script?

Your response will be highly appreciated.

Thanks

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MudassarAli2

I have executed the following

rastercalc=arcpy.sa.Raster(constant_raster_)*0.3048

arcpy.gp.ExtractByMask_sa(rastercalc,water_body_feature_class,WaterMask)

WaterMask.save("H:\\output.tif")

But its giving me an error "AttributeError: 'str' object has no attribute 'save' "

Whats the issue is this?

DanPatterson_Retired

part way down the help link...

Assume your raster is called "elevation" and you want to multiply it by a number (say 0.3048). You do the multiplication, then save it and give it a name. If you want to save it to a *.tif, you would add that extension to the output raster name

outTimes = Raster("elevation") * 0.3048
outTimes.save("C:/sapyexamples/output/outtimes")

MudassarAli2

Thanks for the reply.

I have read the article but can not found solution. I have a raster dataset which I want to multiply by a constant value, how could i achieve this?

DanPatterson_Retired

I am sure ArcMap had arithmetic operators equivalent to 'multiply'

*—Spatial Analyst module | ArcGIS Desktop

check your version of the help for Spatial Analyst and 'Operators' for basic math functionality

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