Hello,
I added a GeoTIFF to one of my .map files. When zoomed in the image appears
fine. When I zoom out the image appears grainy, especially when looking at
dirt fields. I assume the problem is that I built the overviews with the wrong
resampling method when I built overviews with gdaladdo.
Question 1) Does anyone have any recommendations for resampling air photos
when I create an image using gdal? {nearest
(default),average,gauss,cubic,average_mp,average_magphase,mode}
Question 2) I am using a compressed geoTIFF with built in overviews. I am
happy with this format as the file size is small, and the speed is fast. I am
wondering if this is format for having a fast raster while keeping a relatively
small file. Does anyone else have any other suggestions?
Question 3) I have seen several Mapserver snippets of code concerning
GDAL_FORCE_CACHING and GDAL_ONE_BIGREAD. If I am not reprojecting my imagery
which processing directive(s) would be better for a compressed GeoTIFF with
overviews?
LAYER
...
PROCESSING "GDAL_FORCE_CACHING = YES"
Or:
PROCESSING "GDAL_ONE_BIGREAD = YES"
...
END # Air Photo Layer
Thank You
Mark Volz
GIS Specialist
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