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 > >
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