Hi,
I´m trying to improve the quality of a dem and I think that adding the axis of the rivers will be fine in order to do it... but I don´t know how to do it.
someone can help me?
Thanks in advance
Juan Pablo
I´m trying to improve the quality of a dem and I think that adding the axis of the rivers will be fine in order to do it... but I don´t know how to do it.
If I understand your problem the following paper should give you a hint:
Cebecauer, Hofierka, Súri, 2002, Processing digital terrain models by
regularized spline with tension: tuning interpolation parameters for
different input datasets. Proceedings of the Open source GIS - GRASS users
conference 2002 - Trento, Italy, 11-13 September 2002
However doing this in *.surf.rst requires having an accurate elevation data along the stream distributed evenly and dense. As this requirement is hard to fullfill, and often simply cannot be, you may try to use the CatchmentSIMGIS (freeware, Windows only) to help you to determine the elevation along the streams. The DEM it produces looks awfull when compared to a well-done *.surf.rst output, although it's "hydrologicaly correct" and rather reliable for the valley bottoms and ridges elevations, if you include their shapes in the interpolation. So you can sample such a DEM along the valleys and rigdes shapes to enhance your elevation data for the *.surf.rst input. I guess you could also utilize the Topogrid/Anudem in the same way but it COSTS.
What do you Guys think of it?
Maciek