topic Flow Accumulation Floating Point in Data Management Questions https://community.esri.com/t5/data-management-questions/flow-accumulation-floating-point/m-p/196798#M11246 <HTML><HEAD></HEAD><BODY><SPAN>Hello, this has been posted in the ArcHydro forum as well.</SPAN><BR /><SPAN>I am creating Flow accumulation grids in ArcHydro.</SPAN><BR /><SPAN>Some of them are turning out to have a pixel type of signed integer, and work perfectly for watershed delineation.</SPAN><BR /><SPAN>Others, however, have a pixel type of floating point.&nbsp; These return an "overflow" error when I try to run ArcHydro's Stream Definition tool.</SPAN><BR /><SPAN>From what I have read, floating point contains higher values than can fit in an integer.&nbsp; I thought that by reducing the size of the original flow direction grid, that the resulting flow accumulation grid would have lower values.&nbsp; But this is not happening.&nbsp; I actually found a subset of my flow direction grid produced higher flow accumulation values, not lower.</SPAN><BR /><SPAN>Could there be something else that is causing my flow accumulation grids to have a pixel type of floating point rather than signed integer??</SPAN><BR /><SPAN>Thank you!</SPAN></BODY></HTML> Fri, 12 Nov 2010 19:01:48 GMT LornaMurison 2010-11-12T19:01:48Z Flow Accumulation Floating Point https://community.esri.com/t5/data-management-questions/flow-accumulation-floating-point/m-p/196798#M11246 <HTML><HEAD></HEAD><BODY><SPAN>Hello, this has been posted in the ArcHydro forum as well.</SPAN><BR /><SPAN>I am creating Flow accumulation grids in ArcHydro.</SPAN><BR /><SPAN>Some of them are turning out to have a pixel type of signed integer, and work perfectly for watershed delineation.</SPAN><BR /><SPAN>Others, however, have a pixel type of floating point.&nbsp; These return an "overflow" error when I try to run ArcHydro's Stream Definition tool.</SPAN><BR /><SPAN>From what I have read, floating point contains higher values than can fit in an integer.&nbsp; I thought that by reducing the size of the original flow direction grid, that the resulting flow accumulation grid would have lower values.&nbsp; But this is not happening.&nbsp; I actually found a subset of my flow direction grid produced higher flow accumulation values, not lower.</SPAN><BR /><SPAN>Could there be something else that is causing my flow accumulation grids to have a pixel type of floating point rather than signed integer??</SPAN><BR /><SPAN>Thank you!</SPAN></BODY></HTML> Fri, 12 Nov 2010 19:01:48 GMT https://community.esri.com/t5/data-management-questions/flow-accumulation-floating-point/m-p/196798#M11246 LornaMurison 2010-11-12T19:01:48Z Re: Flow Accumulation Floating Point https://community.esri.com/t5/data-management-questions/flow-accumulation-floating-point/m-p/196799#M11247 <HTML><HEAD></HEAD><BODY><SPAN>I converted the floating point grids to integer using raster calculator, and now they work.</SPAN></BODY></HTML> Tue, 16 Nov 2010 12:17:14 GMT https://community.esri.com/t5/data-management-questions/flow-accumulation-floating-point/m-p/196799#M11247 LornaMurison 2010-11-16T12:17:14Z