topic Watershed delineation: Across several large DEMs? in Water Resources Questions https://community.esri.com/t5/water-resources-questions/watershed-delineation-across-several-large-dems/m-p/181628#M868 <HTML><HEAD></HEAD><BODY><SPAN>Greetings!</SPAN><BR /><BR /><SPAN>Thank you in advance.&nbsp; Hopefully this is a simple issue:</SPAN><BR /><BR /><SPAN>My aim is to batch delineate watersheds for many points.&nbsp; (I have been following these directions with no problem: </SPAN><A href="http://forums.arcgis.com/threads/8456-Watershed-Delineation-above-a-POINT">http://forums.arcgis.com/threads/8456-Watershed-Delineation-above-a-POINT</A><SPAN>).</SPAN><BR /><BR /><SPAN>However, many of my watersheds cross DEM boundaries, rather than staying within a single DEM.</SPAN><BR /><BR /><SPAN>My goal: I want Arc Hydro to treat several DEMs (ideally the whole set--40 total) as one large unit, so that I can batch delineate all of my 70 watersheds in one fell swoop.&nbsp; That way it would include the watersheds that cross DEM borders.</SPAN><BR /><BR /><SPAN>I'm not sure how to go about doing this, or if there is a better way.&nbsp; I'm a bit skittish, because some of the terrain preprocessing steps (e.g., flow accumulation) take a long time, even for a single DEM... let alone dozens at once.</SPAN><BR /><BR /><SPAN>Again, thank you!</SPAN><BR /><BR /><SPAN>Roland</SPAN></BODY></HTML> Fri, 15 Jul 2011 14:05:09 GMT RolandDeschain 2011-07-15T14:05:09Z Watershed delineation: Across several large DEMs? https://community.esri.com/t5/water-resources-questions/watershed-delineation-across-several-large-dems/m-p/181628#M868 <HTML><HEAD></HEAD><BODY><SPAN>Greetings!</SPAN><BR /><BR /><SPAN>Thank you in advance.&nbsp; Hopefully this is a simple issue:</SPAN><BR /><BR /><SPAN>My aim is to batch delineate watersheds for many points.&nbsp; (I have been following these directions with no problem: </SPAN><A href="http://forums.arcgis.com/threads/8456-Watershed-Delineation-above-a-POINT">http://forums.arcgis.com/threads/8456-Watershed-Delineation-above-a-POINT</A><SPAN>).</SPAN><BR /><BR /><SPAN>However, many of my watersheds cross DEM boundaries, rather than staying within a single DEM.</SPAN><BR /><BR /><SPAN>My goal: I want Arc Hydro to treat several DEMs (ideally the whole set--40 total) as one large unit, so that I can batch delineate all of my 70 watersheds in one fell swoop.&nbsp; That way it would include the watersheds that cross DEM borders.</SPAN><BR /><BR /><SPAN>I'm not sure how to go about doing this, or if there is a better way.&nbsp; I'm a bit skittish, because some of the terrain preprocessing steps (e.g., flow accumulation) take a long time, even for a single DEM... let alone dozens at once.</SPAN><BR /><BR /><SPAN>Again, thank you!</SPAN><BR /><BR /><SPAN>Roland</SPAN></BODY></HTML> Fri, 15 Jul 2011 14:05:09 GMT https://community.esri.com/t5/water-resources-questions/watershed-delineation-across-several-large-dems/m-p/181628#M868 RolandDeschain 2011-07-15T14:05:09Z Re: Watershed delineation: Across several large DEMs? https://community.esri.com/t5/water-resources-questions/watershed-delineation-across-several-large-dems/m-p/181629#M869 <HTML><HEAD></HEAD><BODY><SPAN>Hi Roland</SPAN><BR /><BR /><SPAN>I'm sure that you've completed your DEM processing but for future reference. I've attached a document from ESRI ArcHydro Team "Global Delineation with EDNA Data" It explains how to using multiple tiles using ArcHydro.</SPAN><BR /><BR /><SPAN>Regards</SPAN></BODY></HTML> Sun, 01 Jan 2012 19:28:49 GMT https://community.esri.com/t5/water-resources-questions/watershed-delineation-across-several-large-dems/m-p/181629#M869 PeterWilson 2012-01-01T19:28:49Z