topic Re: Changing NoData values to zeros (map algebra exoression error) !! in ArcGIS Spatial Analyst Questions

Changing NoData values to zeros (map algebra exoression error) !!

ZarehDemirdjian — Mon, 07 May 2012 19:49:18 GMT

Hello,

I am trying to change the NoData to 0 for my raster dataset, but everytime i am typing this expression its giving me an error:
con(myraster==NoData,0,myraster) !!! is this expression incorrect??

Thanks in advance

Re: Changing NoData values to zeros (map algebra exoression error) !!

DarrenWiens2 — Mon, 07 May 2012 20:29:24 GMT

Try this:

Con(IsNull("myraster"),0,"myraster")

This works in the Raster Calculator, for v10, with ESRI GRIDs. Not sure if it's the same for v9.3, or for other formats.

Re: Changing NoData values to zeros (map algebra exoression error) !!

TarunJaiswal — Mon, 07 May 2012 21:02:40 GMT

Greetings!

Also for future reference, here is a link of a Knowledge Base - Technical Article on

HowTo: Convert NoData values to other values for raster data

Thank you.

Re: Changing NoData values to zeros (map algebra exoression error) !!

ZarehDemirdjian — Tue, 08 May 2012 05:00:21 GMT

Try this:
Con(IsNull("myraster"),0,"myraster")
This works in the Raster Calculator, for v10, with ESRI GRIDs. Not sure if it's the same for v9.3, or for other formats.

Thanks i am using ver 10 as well, i used this it worked without the " ", i just wrote con(isnull(myraster.tif),0,myraster.tif) and it worked one time and that was it, it stoped again, is there any syntax error in my used format?

Re: Changing NoData values to zeros (map algebra exoression error) !!

DarrenWiens2 — Tue, 08 May 2012 13:57:41 GMT

Did it say something like "myraster.tif does not exist or cannot be found"? I'm not sure why but after one or two times, I have to restart Arc to get it to do more.

Re: Changing NoData values to zeros (map algebra exoression error) !!

curtvprice — Wed, 09 May 2012 01:25:32 GMT

Thanks i am using ver 10 as well, i used this it worked without the " ", i just wrote con(isnull(myraster.tif),0,myraster.tif) and it worked one time and that was it, it stoped again, is there any syntax error in my used format?

The quotes are required if you are using the Raster Calculator tool. The text inside the quotes must either be the path to a raster (or simply its name if the raster is in the current workspace) or the name of a raster layer in ArcMap.