Chris Emberson wrote:
The rasters do have colour tables applied, that are expressed using RGB
values, using gdaldem:
75% 107 0 0
50% 196 109 27
25% 247 195 72
0% 252 233 109
nv 0 0 0 0
They are not derived from vector data however. I am unsure of your
requirement in terms of the source of the raster data. All of the pixel
values have been created and either fall between the values of 1-4 or
contain no data.
This is your problem -- gdal only does nearest-neighbor when working
with palleted images -- you can't get a smoother result without adding
the in-between colors.
I think recent versions of GDAL had some code added to convert to RBG.
untested, but using gdal_translate, with the "-expand rgb" flag may do
it. Then use gdalwarp on the resulting image.
-Chris
--
Christopher Barker, Ph.D.
Oceanographer
Emergency Response Division
NOAA/NOS/OR&R (206) 526-6959 voice
7600 Sand Point Way NE (206) 526-6329 fax
Seattle, WA 98115 (206) 526-6317 main reception
chris.bar...@noaa.gov
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