[Gdal-dev] gdaladdo and MapServer's OFFSITE parameter
jmckenna at dmsolutions.ca
Tue Jan 30 17:27:51 EST 2007
I have a test case that produces odd results:
I have 2 geotiffs that have to reproject, add overviews, and tile. Here
is what I found:
1. raw data tiled looks fine:
2. reprojected with gdalwarp, overviews with gdaladdo, and tiled, shows
a sliver between the 2 images:
> gdalwarp -s_srs EPSG:26916 -t_srs EPSG:102736 -of GTiff file1.tif
3. reprojected with gdalwarp, overviews with gdaladdo, tiled, using
OFFSITE in mapfile:
> gdaladdo -r average ./new/file1.tif 2 4 8 16
thinner sliver still exists at full extents (and several zooms after
sliver does not exist when zoomed far in:
4. reprojected with gdalwarp, without overviews, tiled, and using
OFFSITE in mapfile looks perfect:
So there seems to be a problem with using gdaladdo and MapServer's
Am I doing something wrong, or am I missing a commandline switch somewhere?
I have the 2 test images and test mapfile for whoever wants to try this
as well (I just can't distribute the images over this list).
DM Solutions Group Inc.
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