On 06/29/2011 09:50 AM, Andreas Neumann wrote:
Support of resampling methods for the display of the raster data
(bilinear,cubic,cubicspline,lanczos). Gdal supports these, but QGIS
does not
use them.
QGIS currently only supports nearest, as far as I know, which
results in
very ugly display. It is the main reason I am still also using UMN
mapserver
next to QGIS server.
Ugly? Interpolation of rasters at low resolution looks even more ugly
to me. At least the 'nearest' algorithm, showing grid cells as cells,
is honest to the data, unlike interpolation algorithms which don't
have statistical weight behind them.... Anyway, your mileage may vary
:)
it really depends on the nature of the raster. color-table based
rasters or 1bit rasters cannot be resampled of course - but the
display quality of scanned rgb maps, aerial images or 8bit grayscale
maps would benefit.
Andreas
Also satellite data that is being ortho-rectified on the fly will have a
rotation, in which case nearest neighbor is a bad option. Note Ming's
new ossim provider will be able to do this(ortho) once pushed out.
Dave
--
Andreas Neumann
Böschacherstrasse 10A
8624 Grüt (Gossau ZH)
Switzerland
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