RE: [OpenMap Users] watershed area

From: Chapman, Martin <MChapman_at_sanz.com>
Date: Mon, 29 Nov 2004 23:35:00 -0700

Andrea,

Now that I think about it harder, the strategy I gave you was more of a flood plane solution I guess. In order to calculate slope and a descending path you will need more of a mesh object or scene graph class. Once it was in a structure like that you could traverse the mesh and run tests on the edge of each triangulated face.

Martin

-----Original Message-----
Sent: Mon 11/29/2004 5:12 PM
To: openmap-users_at_bbn.com
Cc:
Subject: [OpenMap Users] watershed area
Hi Don,
The algorithms to calculate watershed area are based on elevation data. I
would need a grid of elevation data to perform slope, flow paths and
draining area calculations.

Cheers,
Andrea

-----Messaggio originale-----
Da: owner-openmap-users_at_bbn.com [mailto:owner-openmap-users_at_bbn.com] Per
conto di Don Dietrick
Inviato: luned́ 29 novembre 2004 22.03
A: Andrea Leone
Cc: openmap-users_at_bbn.com
Oggetto: Re: [OpenMap Users] FW: distance along set of lines

Hi Andrea,

What's your criteria for designating a watershed area based on
elevation data?

Just so you know, the TerrainLayer uses DTED data instead of DEM, but
that should be OK, too.

- Don

On Nov 28, 2004, at 11:45 AM, Andrea Leone wrote:

> Hi people,
>
> Does somebody have some idea on how to delineate watershed areas using
> DEM data in OpenMap.
>
> I guess that the Terrain layer could be a good starting point.
>
>
>
>
>
> Thank you,
>
> Cheers, Andrea.
>
>
>
>
>
>
>

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Don Dietrick, dietrick_at_bbn.com
BBN Technologies, Cambridge, MA
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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Received on Tue Nov 30 2004 - 01:35:34 EST

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