[GRASS-user] Is it possible to derive both banks of a river ?
markus.metz.giswork at googlemail.com
Wed Oct 19 09:50:20 EDT 2011
On Tue, Oct 18, 2011 at 10:12 AM, Pankaj Kr Sharma <pkscwc at gmail.com> wrote:
> Dear friends,
> I derived this accumulation map from 90m srtm data.
> Across the river, the accumulation varies and the river line passes through
> the maximum of these values.
> Typical Scenario:
> On right bank Acc= 3
> Near Right Bank Acc=100000
> -.-.-.-.-.-.-.-.-.-.-.-.-|.-.-.-.-.-.-.-.--.-.-.-.-.-.-.-.-.- on river
> line Acc=500000 -->
> Near left Bank Acc=300000
> On left Bank Acc = 2
> i.e. Just at the banks, accumulation values have big difference.
> Whether this fact can be utilised to derive both banks of a river network.
You could try to calculate slope with the flow accumulation map and
then identify river banks as cells with high slope and low flow
Just an idea,
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