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Author Name: Micha Silver (@micha-silver)
Original Redmine Issue: 2304
Redmine category:grass
Assignee: Lorenzo Masini
I cannot get expected results with the r.water.outlet GRASS module in QGIS 1.3.0. I've tried in a few different locations, on both win and linux setups, and I always get a uniform raster with value 0 covering the whole region.
I recall this working properly in earlier versions of QGIS (pre-1.0)
To duplicate the issue:
In the North Carolina database, run r.watershed using the elevation raster to create flow direction, streams and catchments rasters. Then run r.water.outlet using the resulting flow direction, and a drainage outlet point on the streams raster. Results are always a black raster covering the whole region.
Working in GRASS, outside of QGIS, using the same GRASS database, flow direction, and same easting-northing values results in a correct drainage basin.
The text was updated successfully, but these errors were encountered:
Works for me (svn trunk) but the output map displayed in qgis with default color map (grayscale) is black.
Are you sure that realy the values are 0, try r.stats -c? Try to change in raster layer options the colormap to pseudo color in qgis.
I believe, that the bug is in qgis in rendering of a layer with values 0 and 1 using grayscale colormap. If you confirm this, please close this ticket as invalid and create a new one for this problem.
Quite right! I apologize for mis-reporting. The module r.water.outlet indeed works, but QGIS displays grayscale values of 0 and 1 as all black, so there's no differentiation of the final watershed. Changing the symbology to pseudocolor (or any other color ramp) will show the resulting watershed correctly.
Author Name: Micha Silver (@micha-silver)
Original Redmine Issue: 2304
Redmine category:grass
Assignee: Lorenzo Masini
I cannot get expected results with the r.water.outlet GRASS module in QGIS 1.3.0. I've tried in a few different locations, on both win and linux setups, and I always get a uniform raster with value 0 covering the whole region.
I recall this working properly in earlier versions of QGIS (pre-1.0)
To duplicate the issue:
In the North Carolina database, run r.watershed using the elevation raster to create flow direction, streams and catchments rasters. Then run r.water.outlet using the resulting flow direction, and a drainage outlet point on the streams raster. Results are always a black raster covering the whole region.
Working in GRASS, outside of QGIS, using the same GRASS database, flow direction, and same easting-northing values results in a correct drainage basin.
The text was updated successfully, but these errors were encountered: