Lewis,
There is currently no support within Mapnik to handle no-data values.
I'd recommend using gdal utilities (like gdal_translate or
gdal_fillnodata.py) to handle no-data values before sending along to
Mapnik.
Dane
On Jul 7, 2009, at 8:20 AM, Lewis, Ambrose J. wrote:
Hi All:
I’m very new to Mapnik, so please be patient with a dumb question!
I’m trying to use Mapnik to read a DTED file from my Python
program. I modified the GDAL example found in “mapnik-utils-read-
only\example_code\gdal” by simply changing this line:
lyr.datasource = Gdal(file='blake2rgb.tif')
to point to my DTED file:
lyr.datasource = Gdal(file='n44.dt2')
The resulting PNG file appears to be a single band with only a very
few values displayed. I think this is because DTED null value is
“-32,767”.
Is there a way to make this value something more manageable before
calling “render_to_file”?
THANXS!!!
amb
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