Date:Mon, 4 Sep 2006 14:29:45 -0400
Reply-To:Geoffrey Poole <[log in to unmask]>
Sender:Biological Conservation and GIS <[log in to unmask]>
From:Geoffrey Poole <[log in to unmask]>
Subject:Re: stream gradient graph
Comments:To: Jeremy Wheeler <[log in to unmask]>
In-Reply-To:<001101c6d047$fdc30630$0a00a8c0@TANK>
Content-Type:text/plain; charset=ISO-8859-1; format=flowed
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
>
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