[mapserver-users] Using gdaladdo on large TIFFs?

[Antti.Roppola at brs.gov.au]

Hi all,

Frank has confirmed that this is a bug when adding
overviews to a TIFF generated on a system using a
different byte order (in my case, a PC adding overviews
to a TIFF created on a Sun box).

Frank suggested an easy work-around. Run the TIFF through
gdal_translate before adding overviews to ensure everything
is in the same byte order:

	gdal_translate hard0613g.tif hard0613g_le.tif
	gdaladdo hard0613g_le.tif 2 4 8 16 32 64 ...

Cheers,

Antti


-----Original Message-----
From: Antti.Roppola at brs.gov.au [mailto:Antti.Roppola at brs.gov.au]
Sent: Tuesday, 25 June 2002 12:23 PM
To: mapserver-users at lists.gis.umn.edu
Subject: [mapserver-users] Using gdaladdo on large TIFFs?


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