[gdal-dev] gdalwarp makes landcover files blocky when shrinking
Chaitanya kumar CH
chaitanya.ch at gmail.com
Thu Jan 26 23:01:26 EST 2012
Try gdaladdo  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.
On Fri, Jan 27, 2012 at 5:09 AM, John Twilley <mathuin at 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!
> mathuin at gmail dot com
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
Chaitanya kumar CH.
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