Johannes, what about first generating a tin with breaklines (=your shoreline) running a Delaunay constrained triangulation :
http://grass.osgeo.org/wiki/TIN_with_breaklines then output a raster from this tin ? (just a suggestion, I never used/tested v.triangle AddOnn) Vincent. Le lundi 27 août 2012 à 11:58 +0200, Johannes Radinger a écrit : > Hi, > > I get a text file from a hydromorphological model which includes > an massive amount of geographical points with attributes (velocity,depth,..), > which I input using v.in.ascii (around 120000 points). > The points are located in a river (20 m widht) in a resolution of > appr. 20x20 cm, > but this is not fixed and depending on their location within in the river > (points in the outer bends show rougher resolution then points in the > inner bends). > So these points are not regularly (in the sense of raster map) distributed. > > Anyway I want to generate a raster surface (resolution = appr. 0.25) > from the vector points attributes, e.g a surface of velocity and one > for depth. > Additionally to the vector points there is a line vector indicating > the shore line > of the river (depth=0 and velocity = 0). > > Now I am looking for a method for interpolation of these points. I > found v.surf.icw > which would take into account that there is a shoreline which is not overflown > by the water (interpolates within the river). But it is not recommended for > such > massive data point input. Is there any other recommendable way fur such > a purpose (considering the shore line and that there is 0 velocity and > 0 depth on land? > > Any suggestions are welcome! > > Thank you, > > /johannes > _______________________________________________ > grass-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/grass-user > _______________________________________________ grass-user mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-user
