I've never seen gdaladdo -- neat command! Alas, the overviews are the wrong way 'round -- I don't need to zoom out, I need to zoom in. gdaladdo doesn't handle fractional scale values well, so I can't make something bigger out of something smaller like I can with gdalwarp.
Jack. -- mathuin at gmail dot com On Thu, Jan 26, 2012 at 20:01, Chaitanya kumar CH <chaitanya...@gmail.com> wrote: > John, > > Try gdaladdo [1] with the resampling algo set to 'mode'. If you use the -ro > option, it will create an external overview. Check your output with > different combinations of levels. > > [1]: http://www.gdal.org/gdaladdo.html > > On Fri, Jan 27, 2012 at 5:09 AM, John Twilley <math...@gmail.com> wrote: >> >> I am working with elevation and landcover data downloaded from the >> USGS. I use gdalwarp to convert the data to a much smaller pixel. The >> elevation data works very nicely with cubic resampling, but the only >> resampling that works at all for the landcover data is >> nearest-neighbor and that's very blocky. When I last worked with >> landcover data, I used a majority algorithm which produced smoother >> output -- but that algorithm is not implemented in gdalwarp. >> I am looking over the source to gdalwarp to see how hard it is to add >> a new algorithm. Other than that, though, what options are available >> to me? Thanks in advance! >> Jack.-- >> mathuin at gmail dot com >> _______________________________________________ >> gdal-dev mailing list >> gdal-dev@lists.osgeo.org >> http://lists.osgeo.org/mailman/listinfo/gdal-dev > > > > > -- > Best regards, > Chaitanya kumar CH. > > +91-9494447584 > 17.2416N 80.1426E _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
