Hi Johannes, On Mon, Aug 27, 2012 at 11:58 AM, Johannes Radinger < [email protected]> wrote:
> 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! > Consider also v.surf.rst http://grass.osgeo.org/grass70/manuals/html70_user/v.surf.rst.html See also http://grass.osgeo.org/wiki/RST_Spline_Surfaces ciao -- Dr. Margherita Di Leo
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