Hi Many thanks for all the answers! I am doing a line and a polygon for my map.
Best Regards On Sat, Oct 29, 2011 at 7:51 PM, Anita Graser <[email protected]> wrote: > Hi Gerhardus, > > The common approach I saw most of the time is to have a polygon layer that > traces the form of the river banks and a line layer that contains the river > center line and can be used to calculate distances easily. > > Best wishes, > > Anita > > On Sat, Oct 29, 2011 at 7:50 PM, Gerhardus Geldenhuis < > [email protected]> wrote: > >> Hi >> This question is not as much QGIS specific but more about generic GIS >> concepts. >> >> In all of the tutorials I have watched so far rivers is represented as >> lines. This makes sense and if you were to do later analysis I would imagine >> a line would make it easier to get information like the length of all rivers >> in an area. However rivers do not play nice and have varying widths. I could >> adjust the line width but that would only be accurate for a certain part of >> the river. My question is thus how do you represent a river of any feature >> for that matter, of varying width and substantial length. If the river is a >> polygon then I would loose the ability to extract length data or is that >> assumption wrong? Do I represent a river/feature as both a line and a >> polygon then? >> >> Regards >> >> -- >> Gerhardus Geldenhuis >> >> _______________________________________________ >> Qgis-user mailing list >> [email protected] >> http://lists.osgeo.org/mailman/listinfo/qgis-user >> >> > -- Gerhardus Geldenhuis
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