Heiko Schröter wrote:
Hi,
i need to pass parameters for Reprojection via mapservers CGI interface to
gdalwarp.
Gdalwarp needs the '-wo SOURCE_EXTRA=x' to do the reprojection properly.
How can this Parameter beeing passed to gdalwarp ?
Tried the PROCESSING='-wo SOURCE...' key, but probably got the syntax wrong or
this is not the right keyword.
Heiko,
MapServer does not use gdalwarp or it's underlying algorithm. these
two processing options can influence the MapServer source area selection
but there is no direct analog for SOURCE_EXTRA. There is some hardcoded
logic to grow the source area by two pixels, but this is sometimes far
from being enough.
**LOAD_FULL_RES_IMAGE=YES/NO**
This option affects how image data is loaded for the resampler when
reprojecting or otherwise going through complex resampling (as opposed
to the fast default image decimation code path). This forces the source
image to be loaded at full resolution if turned on (default is NO). This
helps work around problems with default image resolution selection in
when radical warping is being done. It can result in very slow processing
if the source image is large.
**LOAD_WHOLE_IMAGE=YES/NO**
This option affects how image data is loaded for the resampler (as above).
This option, if turned on, will cause the whole source image to be loaded
and helps make up for problem identifying the area required, usually due
to radical image reprojection near a dateline or projection "horizon".
The default is NO. Turning this on can dramatically affect rendering
performance and memory requirements.
Best regards,
--
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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