#1924: r.watershed - empty stream segment map
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Reporter: jradinger | Owner: grass-dev@…
Type: defect | Status: new
Priority: normal | Milestone:
Component: Raster | Version: svn-trunk
Keywords: | Platform: Linux
Cpu: x86-32 |
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Comment(by jradinger):
I just checked an the region matches:
{{{
| Type of Map: raster Number of Categories: 0
|
| Data Type: DCELL
|
| Rows: 140
|
| Columns: 190
|
| Total Cells: 26600
|
| Projection: UTM (zone 13)
|
| N: 4928000 S: 4914000 Res: 100
|
| E: 609000 W: 590000 Res: 100
|
| Range of data: min = 0 max = 16433.8095116624
|
|
|
| Data Description:
|
| generated by r.cost
}}}
Two more important things:
1) The elevation input map is accutally already a thinned river raster.
The raster
values represent a pseude elevation which was generated with r.cost from
the source.
Thus the value (elevation) is increasing upstream. r.watershed is just
used for getting
the flowdirection and segmenting the river raster. (if needed I can
provide the elevation-rcost
raster)
2) I tried r.watershed with treshold=1 and that is working perfectly
And maybe a warning/error message should be printed when threshold = 0,
instead of the (for me confusing error)
--
Ticket URL: <http://trac.osgeo.org/grass/ticket/1924#comment:2>
GRASS GIS <http://grass.osgeo.org>
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