topic Why can't Spatial Analyst add??? in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/why-can-t-spatial-analyst-add/m-p/596978#M8697 <HTML><HEAD></HEAD><BODY><SPAN>Hi Folks -</SPAN><BR /><BR /><SPAN>My installation of Arc GIS 9.2 is acting bizarre.&nbsp; I am trying to do a bunch of raster calculations, ie, adding, multiplying, scaling, etc. using the raster calculator.&nbsp; I am obtaining nonsense results;&nbsp; for instance, adding a small float value to a raster, and getting huge numbers back that I know are wrong.&nbsp; I've never had this problem before!&nbsp; I have tried the toolbox and the SA calculator; same results.&nbsp; Tried my original *.img file then converted it to an ESRI grid, same results.&nbsp; I am at a loss to understand why Arc suddenly up and forgot how to do simple math!&nbsp; Any advice for me? thanks.</SPAN></BODY></HTML> Wed, 06 Oct 2010 04:09:02 GMT CyndyBresloff 2010-10-06T04:09:02Z Why can't Spatial Analyst add??? https://community.esri.com/t5/arcgis-spatial-analyst-questions/why-can-t-spatial-analyst-add/m-p/596978#M8697 <HTML><HEAD></HEAD><BODY><SPAN>Hi Folks -</SPAN><BR /><BR /><SPAN>My installation of Arc GIS 9.2 is acting bizarre.&nbsp; I am trying to do a bunch of raster calculations, ie, adding, multiplying, scaling, etc. using the raster calculator.&nbsp; I am obtaining nonsense results;&nbsp; for instance, adding a small float value to a raster, and getting huge numbers back that I know are wrong.&nbsp; I've never had this problem before!&nbsp; I have tried the toolbox and the SA calculator; same results.&nbsp; Tried my original *.img file then converted it to an ESRI grid, same results.&nbsp; I am at a loss to understand why Arc suddenly up and forgot how to do simple math!&nbsp; Any advice for me? thanks.</SPAN></BODY></HTML> Wed, 06 Oct 2010 04:09:02 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/why-can-t-spatial-analyst-add/m-p/596978#M8697 CyndyBresloff 2010-10-06T04:09:02Z