topic Need app for calculating watershed area upstream of a point in ArcGIS Spatial Analyst Questions https://community.esri.com/t5/arcgis-spatial-analyst-questions/need-app-for-calculating-watershed-area-upstream/m-p/168741#M2394 <HTML><HEAD></HEAD><BODY><SPAN>I have this request from a non-ArcGIS user: "Is there an "app" for easily calculating watershed area upstream from a point on a stream?&nbsp; I'm still using the 1964 river mile index.&nbsp; You'd think we could make a hell of a cool visual and interactive river mile index."&nbsp; Since this user is my supervisor and he's been talking about it for a while, I probably should give this request a bit of consideration. </SPAN><BR /><BR /><SPAN>I'm trying to figure out an efficient approach to this request. Does something like this exist? That would be most efficient. Or will I have to roll my own?&nbsp; </SPAN><BR /><BR /><SPAN>Assets I have are a 10 meter DEM of the whole basin, and routed hydrography (I've been trying to get these guys using the Washington State SSHIAP hydro as a river mile index for quite a while. Is the NHD more appropriate now?). </SPAN><BR /><BR /><SPAN>Tools I have are ArcDesktop 9.3.1 and 10 with extensions, and ArcGIS Server 9.3.1. .NET.</SPAN><BR /><BR /><SPAN>Abilities I have include considerable spatial analyst experience with hydro modeling, some success with Model Builder, some python scripting,&nbsp; some use of map mashups and Java Script API, and laughable ability with VB and Map Objects. </SPAN><BR /><BR /><SPAN>I suppose I should go the steps to derive an accumulation grid from the DEM. Then wouldn't each cell in the accumulation grid contain a count of all the cells that drain to the cell, so an ArcMap user could click on the grid with the i tool and get that value, multiply by the grid's cell area and that's your drainage area?&nbsp; But then how do I streamline that for the user, and particularly how to I deliver that to the non-ArcMap user? </SPAN><BR /><BR /><SPAN>I suppose I could also convert the routed hydro to a grid and overlay the accumulation grid and see if I could get a grid that would give a ArcMap user both stream measure and accumulation information in one i click.</SPAN></BODY></HTML> Tue, 06 Sep 2011 21:27:54 GMT PaulHuffman 2011-09-06T21:27:54Z Need app for calculating watershed area upstream of a point https://community.esri.com/t5/arcgis-spatial-analyst-questions/need-app-for-calculating-watershed-area-upstream/m-p/168741#M2394 <HTML><HEAD></HEAD><BODY><SPAN>I have this request from a non-ArcGIS user: "Is there an "app" for easily calculating watershed area upstream from a point on a stream?&nbsp; I'm still using the 1964 river mile index.&nbsp; You'd think we could make a hell of a cool visual and interactive river mile index."&nbsp; Since this user is my supervisor and he's been talking about it for a while, I probably should give this request a bit of consideration. </SPAN><BR /><BR /><SPAN>I'm trying to figure out an efficient approach to this request. Does something like this exist? That would be most efficient. Or will I have to roll my own?&nbsp; </SPAN><BR /><BR /><SPAN>Assets I have are a 10 meter DEM of the whole basin, and routed hydrography (I've been trying to get these guys using the Washington State SSHIAP hydro as a river mile index for quite a while. Is the NHD more appropriate now?). </SPAN><BR /><BR /><SPAN>Tools I have are ArcDesktop 9.3.1 and 10 with extensions, and ArcGIS Server 9.3.1. .NET.</SPAN><BR /><BR /><SPAN>Abilities I have include considerable spatial analyst experience with hydro modeling, some success with Model Builder, some python scripting,&nbsp; some use of map mashups and Java Script API, and laughable ability with VB and Map Objects. </SPAN><BR /><BR /><SPAN>I suppose I should go the steps to derive an accumulation grid from the DEM. Then wouldn't each cell in the accumulation grid contain a count of all the cells that drain to the cell, so an ArcMap user could click on the grid with the i tool and get that value, multiply by the grid's cell area and that's your drainage area?&nbsp; But then how do I streamline that for the user, and particularly how to I deliver that to the non-ArcMap user? </SPAN><BR /><BR /><SPAN>I suppose I could also convert the routed hydro to a grid and overlay the accumulation grid and see if I could get a grid that would give a ArcMap user both stream measure and accumulation information in one i click.</SPAN></BODY></HTML> Tue, 06 Sep 2011 21:27:54 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/need-app-for-calculating-watershed-area-upstream/m-p/168741#M2394 PaulHuffman 2011-09-06T21:27:54Z Re: Need app for calculating watershed area upstream of a point https://community.esri.com/t5/arcgis-spatial-analyst-questions/need-app-for-calculating-watershed-area-upstream/m-p/168742#M2395 <HTML><HEAD></HEAD><BODY><SPAN>A colleague showed me this IMS app from USGS: </SPAN><A href="http://water.usgs.gov/osw/streamstats/Washington.html">http://water.usgs.gov/osw/streamstats/Washington.html</A><SPAN> Might be good enough until I have to process a bunch of points.</SPAN></BODY></HTML> Fri, 09 Sep 2011 15:28:14 GMT https://community.esri.com/t5/arcgis-spatial-analyst-questions/need-app-for-calculating-watershed-area-upstream/m-p/168742#M2395 PaulHuffman 2011-09-09T15:28:14Z