topic Re: What is wrong with this syntax when using the �??raster calculator�?�? in ArcGIS Spatial Analyst Questions

ArcGIS 10 Raster Calculator tool syntax?

JamalNUMAN — Thu, 17 May 2012 15:22:49 GMT

What is wrong with this syntax when using the Raster Calculator tool? (9.3)

I'm wondering what might be the correct syntax when using the ArcGIS 10 Raster Calculator tool compared to the old 9.3 Single Output Map Algebra tool?

Two screenshots are attached.

The first attachment shows what was correct when using the ArcGIS 9.3 Single Output Map Algebra tool

The second attachment shows how I tried to do the same using the ArcGIS 10 Raster Calculator tool which did not work!

What might be the correct syntax to such expression when using the Raster Calculator tool?

Thank you for the help

Best

Jamal

(Original post date 5/17/2012, edited to fix garbled formatting from old forums conversion by Curtis Price 5/18/2015)

Re: What is wrong with this syntax when using the �??raster calculator�?�?

TimothyHales — Fri, 18 May 2012 13:36:08 GMT

Hi Jamal,

Dot notation does not work in the 10.0 Raster Calculator. You will need to use the Lookup function. Something like this:

SetNull(Lookup("Raster","COUNT") <= 250, "Raster" )

Using raster attribute other than 'value' in map algebra
Lookup function in v10.0 Map Algebra: implementing dot notation in v10.0?

Re: What is wrong with this syntax when using the �??raster calculator�?�?

JamalNUMAN — Fri, 18 May 2012 15:36:25 GMT

Hi Jamal,

Dot notation does not work in the 10.0 Raster Calculator. You will need to use the Lookup function. Something like this:

SetNull(Lookup("Raster","COUNT") <= 250, "Raster" )

Using raster attribute other than 'value' in map algebra
Lookup function in v10.0 Map Algebra: implementing dot notation in v10.0?

Thank you for the answer Timothy.

Sounds it is not working with the lookup tool! Please, have a look on the screenshot below.

[ATTACH=CONFIG]14426[/ATTACH]

The two raster I�??m working with are attached

Best

Jamal

Re: What is wrong with this syntax when using the �??raster calculator�?�?

TimothyHales — Fri, 18 May 2012 15:55:03 GMT

Here, try this:

SetNull(("StreamOrder"==1) & ( Lookup("StreamLink","count") <= 250), "StreamLink")

Re: What is wrong with this syntax when using the �??raster calculator�?�?

JamalNUMAN — Fri, 18 May 2012 17:32:47 GMT

Here, try this:

SetNull(("StreamOrder"==1) & ( Lookup("StreamLink","count") <= 250), "StreamLink")

Many thanks for the help.

The problem wouldn�??t be resolved without the great help you offered.

Best

Jamal

Re: What is wrong with this syntax when using the �??raster calculator�?�?

curtvprice — Mon, 18 May 2015 05:56:40 GMT

Hey Jamal, could you please move this to Spatial Analyst - it really doesn't belong here in Story Maps.

Re: What is wrong with this syntax when using the ???raster calculator????

OwenGeo — Mon, 18 May 2015 11:33:47 GMT

I moved this discussion to Spatial Analyst. Thanks Curtis.