topic Raster Calculator in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/raster-calculator/m-p/114710#M1600 <HTML><HEAD></HEAD><BODY><SPAN>Im totally not understanding the raster calculator and how to build statements. I have a stream network and some lakes that I have build and put some buffers around. I need to covert my raster verisons of my buffers to a 1,0 raster (with a value of 1 for areas outside of the buffer and 0 within it). I need to use the con and isnull function, but I have no idea on how to bulid that statement. can anyone help me?</SPAN></BODY></HTML> Fri, 26 Apr 2013 03:10:52 GMT meganherren 2013-04-26T03:10:52Z Raster Calculator https://community.esri.com/t5/arcgis-spatial-analyst-questions/raster-calculator/m-p/114710#M1600 <HTML><HEAD></HEAD><BODY><SPAN>Im totally not understanding the raster calculator and how to build statements. I have a stream network and some lakes that I have build and put some buffers around. I need to covert my raster verisons of my buffers to a 1,0 raster (with a value of 1 for areas outside of the buffer and 0 within it). I need to use the con and isnull function, but I have no idea on how to bulid that statement. can anyone help me?</SPAN></BODY></HTML> Fri, 26 Apr 2013 03:10:52 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/raster-calculator/m-p/114710#M1600 meganherren 2013-04-26T03:10:52Z Re: Raster Calculator https://community.esri.com/t5/arcgis-spatial-analyst-questions/raster-calculator/m-p/114711#M1601 <HTML><HEAD></HEAD><BODY><SPAN>To do this I create a dummy attribute field for my polygons and assign it a value of 1 to use as my raster field during conversion. Once you have converted your stream buffers to a raster using the AtcToolbox &gt; Conversion Tools &gt; To Raster &gt; Feature to Raster tool you can assign your background values using the following con statement in the raster calculator and yes, it is case sensitive.</SPAN><BR /><BR /><SPAN>Con(IsNull("RivBuff"), 0, "RivBuff")</SPAN><BR /><BR /><SPAN>It is important that you set your analysis environment so ArcGIS knows "where" to create the 0 background values. Ideally you have a raster that will define your extent and mask. You set your environment under the ArcMap menu Geoprocessing &gt; Environments... </SPAN><BR /><SPAN>And then "Processing Extent" and "Raster Analysis". If you do not have a preexisting raster to define this environment then you can use the "Same as Display" under extent which will return a raster with background values that matches your display in ArcMap.</SPAN></BODY></HTML> Fri, 26 Apr 2013 21:50:36 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/raster-calculator/m-p/114711#M1601 JeffreyEvans 2013-04-26T21:50:36Z