On Fri, 6 Apr 2012, Helmut Kudrnovsky wrote:
- is the elevation exactly the same map used to calculate accumulation?
Helmut,
I re-ran each step and saw the same error when r.stream.extract uses the
weighted accumulation map.
r.info map=dem10m.avg:
Type of Map: raster Number of Categories: 255 |
Data Type: DCELL
Rows: 2671
Columns: 3216
Total Cells: 8589936
Projection: Lambert Conformal Conic
N: 735780 S: 655650 Res: 30
E: 2138580 W: 2042100 Res: 30
Range of data: min = 561.412536621094 max = 2212.32543945312
r.info map=dem10m.acc.weighted:
Type of Map: raster Number of Categories: 255 |
Data Type: DCELL
Rows: 2671
Columns: 3216
Total Cells: 8589936
Projection: Lambert Conformal Conic
N: 735780 S: 655650 Res: 30
E: 2138580 W: 2042100 Res: 30
Range of data: min = -60301.3530574744 max = 3455.01235646488
The error is: Accumulation map does not match elevation map! Could the
range of elevation data be the issue? The weighting formula multiplies
tangential curve values < 0 by -100 * tangential curve values.
Rich
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