topic Re: Raster Calculator - using the conditional options in Geoprocessing Questions

Raster Calculator - using the conditional options

lauriehogan — Mon, 23 Feb 2015 19:17:06 GMT

I'd like to use the raster calculator to convert 0 values in the raster to 0.0001.

I was trying to use the syntax below

CON ("raster1" == 0, 0.001, "raster1")

Based on 39974 - Change a particular value of a raster dataset to zero without changing the other values

1. In ArcMap, navigate to ArcToolbox > Spatial Analyst Tools > Map Algebra and open the Raster Calculator.

2. In the Raster Calculator, input the following syntax:

Con("InRaster" == -9999, 0 , "InRaster")

All I get is errors in 10.3 (see attachment). I'm not a python user, so could really use help with this syntax.

Thanks for the help!

Re: Raster Calculator - using the conditional options

DanPatterson_Retired — Mon, 23 Feb 2015 19:23:02 GMT

That is for older versions, check the current help files for Con

Re: Raster Calculator - using the conditional options

lauriehogan — Mon, 23 Feb 2015 19:26:47 GMT

Thanks for pointing me to the area to check out... I had tried to find that source, but no luck.

I'll give these syntax examples a try.

Re: Raster Calculator - using the conditional options

JakeSkinner — Mon, 23 Feb 2015 19:33:36 GMT

Hi Laurie,

How are you adding the raster name to the statement? Are you double-clicking from the 'Layers and Variables' box within this tool? The error is indicating it cannot find the raster.

Re: Raster Calculator - using the conditional options

DanPatterson_Retired — Mon, 23 Feb 2015 19:35:31 GMT

A good link for bookmarking is the top of the Arctoolbox tree as in this link...

Re: Raster Calculator - using the conditional options

lauriehogan — Mon, 23 Feb 2015 19:56:17 GMT

Con ("raster1", 0.0001, "raster1" == 0) was next syntax in raster caculator didnt' work either.

and

Con ("raster" == 0 , 0.0001, "raster1")

Con("elev_967_1","elev_967_1", 0.0001, "VALUE>0.0001")

Con("VALUE < 0.001","elev_967_1", 0.0001)

None of these worked.

Re: Raster Calculator - using the conditional options

lauriehogan — Mon, 23 Feb 2015 20:00:58 GMT

Jake,

Yes, I was double clicking into the Layers and variables in the dialog box... (These are not on my c: drive, but these layers are in arcmap currently.

Laurie