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On 20/11/2011 08:58, Pankaj Kr Sharma wrote:
<blockquote
cite="mid:CAM5_u0GcMKJtwkiHiV4aT81+qVc_iebQG7eSSD9EuTLerfKQ9w@mail.gmail.com"
type="cite">
<div>Dear grass users,</div>
<div>I am trying to find sub-basins and their outlets exactly for
each 300 sq. km. in a bigger basin.</div>
<div>I think accumulation value indicates the no. of cells
draining at a cell. And will thus be a good starting point for
such calculation.</div>
</blockquote>
<br>
The threshold value is what you're looking for. You need to
calculate how many raster cells it will take to make 300 sq. km -
depending on the raster resolution. For example, if the resolution
is 90 m. (i.e. SRTM elevation data) then each cell = 8100 sq.m. then
you will need a threshold of 370,000 to create basins of about 300
sq.km.<br>
<br>
<blockquote
cite="mid:CAM5_u0GcMKJtwkiHiV4aT81+qVc_iebQG7eSSD9EuTLerfKQ9w@mail.gmail.com"
type="cite">
<div>The other option is to start backwards from the basin outlet
and keep on investigating upwards in a stream network.</div>
<div>Can someone provide some hint / help in this regard.</div>
<div>Thanks.</div>
<br>
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</blockquote>
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