Thanks to everyone for these ideas. It will be fun to give this a try. Thanks,
Calvin On Thu, Aug 6, 2020 at 8:27 PM Priv.-Doz. Dr. Maria Shinoto < [email protected]> wrote: > Sorry, just an addendum, > > for creating these watershed maps, you need a DEM, older satellite data > should suffice for larger maps. I was working on a small scale (16 km2) > with a 5m DTM. > > The process is the same: use WangLiu algorithm in the processing toolbox > (SAGA tools) to fill sinks, then calculate Strahler order (SAGA tools), set > a threshold for the start of a "stream", then define a point for the > upstream area. You can vectorize the area and then style the streams (great > with the order value, you can set the width of the streams) and the > drainage basins. > > I am still impressed, it is so helpful and easy. You can do the same with > GRASS tools as well, although some steps vary a bit. > > Good luck, > Maria > > > > > Hi, > > I just created one yesterday with the book of Hans van der Kwast. So easy! > (when you are told what to do...) > > He has a YouTube channel where you can follow these instructions as well. > > Best, > Maria > > > Am 07.08.2020 um 07:13 schrieb C Hamilton <[email protected]>: > > > > I was wondering if anyone had any idea on how one would go about > creating these types of maps in QGIS. > > > > https://www.visualcapitalist.com/maps-worlds-watersheds/ > > > > Assume the watershed polygons are available as well as the river data. > > > > Anyway I think these pictures are stunning. > > > > Thanks, > > > > Calvin > > _______________________________________________ > > Qgis-user mailing list > > [email protected] > > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > _______________________________________________ > Qgis-user mailing list > [email protected] > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
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