Re: [Qgis-user] How to Create These type of Watershed Maps in QGIS
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 < maria.shin...@zaw.uni-heidelberg.de> 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 : > > > > 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 > > Qgis-user@lists.osgeo.org > > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user > > ___ > Qgis-user mailing list > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] How to Create These type of Watershed Maps in QGIS
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 : > > 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 > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] How to Create These type of Watershed Maps in QGIS
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 : > > 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 > Qgis-user@lists.osgeo.org > List info: https://lists.osgeo.org/mailman/listinfo/qgis-user > Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] How to Create These type of Watershed Maps in QGIS
Watershed polygons and river lines for the US are available from the USGS. You would do a spatial joint between the river and basins to add the basin information to the rivers layer. You would then symbolize the rivers by category, using the basin attribute as the categorizing field. The rivers appear to have their line width determined by their hierarchy in the tributary network. I'm not sure if the USGS data has an indication of flow magnitude, which you would use to set the line width. On 8/6/2020 4:13 PM, C Hamilton wrote: 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 Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
Re: [Qgis-user] How to Create These type of Watershed Maps in QGIS
Calvin and list On Thu, Aug 6, 2020 at 3:14 PM C Hamilton wrote: > 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. > Well if you already have the hydrologic network and the watershed polygons, then you need to intersect the hydrologic network with the watershed polygons in order to transfer the watershed polygon identifier to the watercourses therein. At that point you can colour the watercourses according to the watershed polygon identifier. Creating good watershed polygons is a fair bit of work, usually starting with a digital elevation model. -- Chris Hermansen · clhermansen "at" gmail "dot" com C'est ma façon de parler. ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] How to Create These type of Watershed Maps in QGIS
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 Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
[Qgis-user] Missing DLLs for processing standalone console tool
Hi I am trying to use the processing standalone console tool, but when I run qgis_process, I get a few error messages, saying that a few DLLs are missing: Qt5Widgets.dll, Qt5Core.dll, exiv2.dll and Qt5Xml.dll. Is there anything that I have to install in addition to QGIS? The only documentation I have found so far is https://changelog.qgis.org/en/qgis/version/3.14/#new-standalone-console-tool-for-running-processing. Tried on QGIS 3.14.1 and Windows 10, 64 bit. Regards, Magnus -- Sent from: http://osgeo-org.1560.x6.nabble.com/QGIS-User-f4125267.html ___ Qgis-user mailing list Qgis-user@lists.osgeo.org List info: https://lists.osgeo.org/mailman/listinfo/qgis-user Unsubscribe: https://lists.osgeo.org/mailman/listinfo/qgis-user
