topic syntax error in con statement in ArcGIS Spatial Analyst Questions

syntax error in con statement

AshleyJohnson — Tue, 04 Jan 2011 23:17:09 GMT

I am using a land value grid and am trying to use a con statement to set certain land values equal to 1 and all else equal to 0. This is my syntax: con (Raster1 >=135000 & Raster1 <=175000, 1, 0)

I have tried so many different ways to write this, double (, spaces, etc. And I continue to get the error message 000539; the truth value of a raster is ambiguous. What am I doing wrong?

Any help is appreciated.
I am running ArcGIS 10, ArcView with Spatial Analyst

Re: syntax error in con statement

DanPatterson_Retired — Tue, 04 Jan 2011 23:31:30 GMT

I suggest that you type as little as possible and use the selection options within the raster calculator as much as possible
con (Raster1 >=135000 & Raster1 <=175000, 1, 0)

might be
con( ("Raster1" >= 135000) & ("Raster1" <= 175000), 1, 0)
if memory serves, grid names are enclosed in " " in version 10 and [ ] in 9.x, also put ( ) around statements that use boolean operations. and check the forum, this has been documented previously
http://forums.arcgis.com/threads/13219-Con-statement-error-in-raster-calculator?p=40419&posted=1#post40419

Re: syntax error in con statement

AshleyJohnson — Wed, 02 Mar 2011 17:56:13 GMT

Thank you!

Re: syntax error in con statement

AshleyJohnson — Wed, 02 Mar 2011 18:27:54 GMT

Not to be greedy, but how would I nest a set null statement in there? So instead of setting the false values to 0 I would set them to null?

Re: syntax error in con statement

DanPatterson_Retired — Wed, 02 Mar 2011 18:59:43 GMT

you might want to consider using the setnull instead
http://help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//009z00000007000000.htm

Re: syntax error in con statement

AshleyJohnson — Thu, 03 Mar 2011 11:22:05 GMT

Thanks so much, good stuff. I appreciate it.

Re: syntax error in con statement

curtvprice — Mon, 10 Nov 2014 01:32:47 GMT

> how would I nest a set null statement in there? So instead of setting the false values to 0 I would set them to null?

Or if you like the simplicity of Con, just leave off the false_expression:

Con(("Raster1" >= 135000) & ("Raster1" <= 175000), 1)