zeta, Are the lines in topo.tif contour lines? How did you generate them?
On Tue, Feb 26, 2013 at 12:20 AM, zeta <[email protected]> wrote: > Chaitanya kumar CH wrote: > > > >zeta, > > > >The gaps are likely caused by pixels with no data. A simple method is to > >run gdal_fillnodata.py on the original raster and then create the > contours. > > > >http://www.gdal.org/gdal_fillnodata.html > > Thanks Chaitanya, > > that's excellent news, as I previously searched for algorithms about curve > reconstruction, and none seemed easy for implementation. I was driven by > approach using Delaunay Triangulation, referenced to Amenta "The crust and > the beta -skeleton: Combinatorial curve reconstruction" and plastically > explained i.e. here: > http://valis.cs.uiuc.edu/~sariel/research/CG/applets/Crust/Crust.html but > I thought to look for shortcut if possible, without reinventing > implementation. > > I tried the script, and I get some gaps filled, but most aren't. I used > -md parameter of 20px, but changed that value from 10 to 300 without > significant improvement. Then I used mask file, which I assume works as in > OpenCV Inpaint function, by using mask as a helper for gap detection, but > without success. > > I'm attaching example image, and mask image, which I used to test the > script, in a hope that someone can tell me if better results are possible. > > Thanks -- Best regards, Chaitanya kumar CH. +91-9494447584 17.2416N 80.1426E
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