gis valley shape from DigitalTerrainModel

[stefanocudini]

https://docs.qgis.org/2.8/en/docs/training_manual/processing/hydro.html

[stefanocudini]

[stefanocudini]

drainage basin using qgis saga:

[stefanocudini]

https://plugins.qgis.org/plugins/geomelwatershed-master/

[stefanocudini]

QUESTION OPEN:
https://gis.stackexchange.com/questions/443082/qgis-generate-basin-polygons-from-valley-linestrings

[stefanocudini]

algoritm to apply valley name to basins from osm linestring:

https://gis.stackexchange.com/questions/443601/union-polygons-by-intersection-lines-in-qgis/443605#443605

[stefanocudini]

python https://pypi.org/project/pyflwdir/