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Date:         Tue, 5 Sep 2006 12:12:41 -0700
Reply-To:     Dave Hockman-Wert <[log in to unmask]>
Sender:       Biological Conservation and GIS <[log in to unmask]>
From:         Dave Hockman-Wert <[log in to unmask]>
Subject:      Re: stream gradient graph
In-Reply-To:  <[log in to unmask]>
Content-Type: text/plain; charset=iso-8859-1

Piggy-backing on Geoff's suggestions, I would add that you could also use the actual elevation value for each stream pixel as the y-axis value instead of the slope value. It would give you a stream "cross-section" type of graph, rather than a graph of the slope every 10-meters. Calculating flow distance in the raster environment would be quicker, but you could also do the following in a vector environment: convert the "stream network" raster to a line feature and make it a route, convert the DEM along the "stream network" raster to a point feature with the elevation as the value that gets transferred, "Locate Features Along Routes" (the points) to add the route distance to the point feature's DBF, and then you have the x and y values in one DBF, which could be opened in Excel and graphed. I've done this for a whole series of streams. Dave Corvallis, Ore. --- Geoffrey Poole <[log in to unmask]> wrote: > Oops. Forgot the line graph part... > > You can calculate flow distance from each pixel in > the landscape to the > outlet -- I can't remember exactly which tool you > use, but it's either > under hydrology or is the least cost path tool using > a grid derived from > topography as the cost grid... If there's not an > obvious hydrology > tool, check the help under least cost path analysis > tools. The help > tells you what to use for your cost grid in order to > get hydrologic flow > distance in a watershed. > > Then you can extract flow distance (for use on the x > axis of your graph) > and slope for each stream pixel (for use on the y > axis). > > -Geoff Poole > > Jeremy Wheeler wrote: > > Hello List, > > > > I am looking for a way to produce a simple line > graph of stream gradient > > for a given watercourse in our watershed. The x > axis would be linear > > distance units of stream reach, and the y axis > would be elevation above > > sea level in feet. > > > > I am thinking that this should be relatively easy > with our 10 meter dem > > and our streams layer. I am using ArcGIS > (ArcInfo) 9.1 (with several > > extensions). > > > > Ideas? > > > > Thanks, > > > > Jeremy > > > > > ********************************************************** > > CONSGIS LISTSERV > > To unsubscribe send to [log in to unmask] this > email message > > SIGNOFF CONSGIS > > Questions? Contact Pete August, [log in to unmask] > > > ********************************************************** > > > > > > ********************************************************** > CONSGIS LISTSERV > To unsubscribe send to [log in to unmask] this > email message > SIGNOFF CONSGIS > Questions? Contact Pete August, [log in to unmask] > ********************************************************** > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ********************************************************** CONSGIS LISTSERV To unsubscribe send to [log in to unmask] this email message SIGNOFF CONSGIS Questions? Contact Pete August, [log in to unmask] **********************************************************


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