topic Raster Calculator Problem in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/raster-calculator-problem/m-p/162587#M2316 <HTML><HEAD></HEAD><BODY><SPAN>I am trying to perform a sedimentation analysis for a watershed. I have created multiple rasters that I need to multiply together.&nbsp; When I multiply the four rasters together with the raster calculator I have negative and positive values.&nbsp; However, the lowest value in the rasters being multiplied is zero.&nbsp; I can multiply up to three of them together without this happening but all four seems to add negative values.&nbsp; I am using ArcGIS 9.3.1 and all rasters have the same projection, cell size, and are in a GRID format. Any ideas as to why negative values are showing up?</SPAN></BODY></HTML> Wed, 25 Jul 2012 03:58:38 GMT AndrewCopley 2012-07-25T03:58:38Z Raster Calculator Problem https://community.esri.com/t5/arcgis-spatial-analyst-questions/raster-calculator-problem/m-p/162587#M2316 <HTML><HEAD></HEAD><BODY><SPAN>I am trying to perform a sedimentation analysis for a watershed. I have created multiple rasters that I need to multiply together.&nbsp; When I multiply the four rasters together with the raster calculator I have negative and positive values.&nbsp; However, the lowest value in the rasters being multiplied is zero.&nbsp; I can multiply up to three of them together without this happening but all four seems to add negative values.&nbsp; I am using ArcGIS 9.3.1 and all rasters have the same projection, cell size, and are in a GRID format. Any ideas as to why negative values are showing up?</SPAN></BODY></HTML> Wed, 25 Jul 2012 03:58:38 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/raster-calculator-problem/m-p/162587#M2316 AndrewCopley 2012-07-25T03:58:38Z Re: Raster Calculator Problem https://community.esri.com/t5/arcgis-spatial-analyst-questions/raster-calculator-problem/m-p/162588#M2317 <HTML><HEAD></HEAD><BODY><BLOCKQUOTE class="jive-quote">I am trying to perform a sedimentation analysis for a watershed. I have created multiple rasters that I need to multiply together.&nbsp; When I multiply the four rasters together with the raster calculator I have negative and positive values.&nbsp; However, the lowest value in the rasters being multiplied is zero.&nbsp; I can multiply up to three of them together without this happening but all four seems to add negative values.&nbsp; I am using ArcGIS 9.3.1 and all rasters have the same projection, cell size, and are in a GRID format. Any ideas as to why negative values are showing up?</BLOCKQUOTE><BR /><BR /><SPAN>You may be able to solve this mystery by using the identify tool to compare the values in the four inputs and the output for individual locations.</SPAN></BODY></HTML> Mon, 06 Aug 2012 22:50:13 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/raster-calculator-problem/m-p/162588#M2317 curtvprice 2012-08-06T22:50:13Z