Raster Calculator Problem

Discussion created by muengineer on Jul 24, 2012
Latest reply on Aug 6, 2012 by curtvprice
I am trying to perform a sedimentation analysis for a watershed. I have created multiple rasters that I need to multiply together.  When I multiply the four rasters together with the raster calculator I have negative and positive values.  However, the lowest value in the rasters being multiplied is zero.  I can multiply up to three of them together without this happening but all four seems to add negative values.  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?