[mapserver-users] Using gdaladdo on large TIFFs?

[Antti.Roppola at brs.gov.au]

Hi all,

Rather than manually creating tiles and and different resolution layers to handle
large (>10,000 x 10,000 pixel) rasters, I have been experimenting with gdaladdo.

So far I have taken my large raster and used gdaladdo to add overviews at
3,5,9,12 and 16. To my reading of the doco, and output from gdalinfo, the 
level 16 overview ( approx 800 x 700 pixels) should be used to generate the
view of the raster at full zoom (since my displayed image is 600 x 600). However,
I don't see anything until I zoom right in to a small area.

What am I missing here?

	http://mapserver.gis.umn.edu/doc/raster-howto.html
	http://www.remotesensing.org/gdal/gdal_utilities.html
	http://mapserver.gis.umn.edu/wilma/mapserver-users/0107/msg00349.html
	http://mapserver.gis.umn.edu/cgi-bin/wiki.pl?Gdaladdo

Cheers,

Antti