[mapserver-users] Image Speed Questions---Generic

[Frank Warmerdam]

Lowell, 

If you use MapServer 3.5 and the GDAL link for TIFF support you can add
overviews to the existing DRG files (using the gdaladdo utility, or addtifo)
and the image catalog (there is also a gdal utility for creating tile indexes).
This gives good performance (only needed files are touched, with lots of
overviews (pyramids) you don't have to read much data from each file), and
you don't have to massage you data too much. 

If you have alot of files, I would also encourage you to build at least one
full region overview file to avoid having to touch every file to show a 
region wide map.  

Best regards,

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I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | Geospatial Programmer for Rent