topic Re: watershed in ArcGIS Spatial Analyst Questions

watershed

mahendargadapa — Wed, 16 Jul 2014 17:30:35 GMT

How can i Deliniate a watershed with SRTM data..I Need to have streams along with the area covered by the watershed.

Re: watershed

DanPatterson_Retired — Wed, 16 Jul 2014 17:33:50 GMT

You need the spatial analyst extension and there is a Hydrology set there that you serve your purposes. ArcGIS Help (10.2, 10.2.1, and 10.2.2)‌

Re: watershed

mahendargadapa — Wed, 16 Jul 2014 17:42:27 GMT

Thank you DAN, I tried with that tool but i didn't got the proper results, Up to Streams it is ok but to extract the watershed area it didn't given the proper result.

Re: watershed

DanPatterson_Retired — Wed, 16 Jul 2014 17:44:35 GMT

You would have to describe what "proper" results means. Do you mean unexpected results? or was there an error? Visuals would help including what you used as inputs to the tools themselves. Did you fill sinks prior to running of the tools in the Hydrology toolset? More details required.

Re: watershed

mahendargadapa — Wed, 16 Jul 2014 17:49:15 GMT

yes i filled the sinks,flow dir, flow accumulation, pour points all i followed the way i got the streams,But lastly it is not showing any area and not any error just its showing a completly dark output not giving any watersehd area

Re: watershed

DanPatterson_Retired — Wed, 16 Jul 2014 17:53:50 GMT

Still more information (and visuals) on the inputs that you used. If any step in the process is suspect, then watershed will yield erroneous results

Re: watershed

V_StuartFoote — Wed, 16 Jul 2014 18:23:52 GMT

Mahendar,

You could also download and install the ArcHydro extension. It has very extensive help for stepping you through the processes leading to a watershed delineation. The download details are here in this discussion: New password for Arc Hydro ftp site - March 11 2014‌

Also, would suggest you might move this posting to the Arc Hydro‌ Sub-Space and apply a few tags "arc_hydro" "watershed"

Stuart

Re: watershed

AndrewMoffitt — Mon, 21 Jul 2014 19:03:42 GMT

At the UC, Cody Benkelman of esri showed off their new watershed tool in the Managing LiDAR technical workshop.

It is free for now, but cheap after beta this fall.

You can use 30m NED for the USA, or 90m SRTM worldwide (how convenient for you ).

You need to use an esri login to use the free service, but in testing at the office, it works great.

This link has all the goods.

http://www.arcgis.com/home/item.html?id=8e48f6209d5c4be98ebbf90502f41077‌

Report back your experience if you wouldn't mind.

Re: watershed

CaitlinScopel — Tue, 05 Aug 2014 01:40:48 GMT

Mahendar,

If you are interested in delineating using the 90m SRTM data, we (Esri) provide a watershed geoprocessing service called Watershed that will do on-the-fly watershed deleation. The source of our world data coverage is HydroSHEDS, a hydrologically conditioned version of the 90m SRTM data. The Watershed tool is still in BETA, so it is free to use if you have an ArcGIS Online organizational account. Here is a one hour live training seminar from a few months ago that shows the tool in action

Caitlin