[gdal-dev] Re: gdalwarp -co COMPRESSION issues

[Maciej Sieczka]

Adam Nowacki pisze:
> Add -co "TILED=YES" to produce tiled tiff (and a lot smaller that way).

1. There are software that perform better with stripped TIFFs, eg. 
ArcPad [1], QGIS (latest SVN trunk) too - the tiff at [2] if tiled with 
gdal_translate takes about 10 (ten) times longer to render that it's 
stripped version in QGIS.

2. There are software which don't support tiled TIFF at all. To stay on 
the safe side I prefer to create stripped TIFFs in case I might be 
sharing/selling them. I might be not the only one.

2. User will be surprised that gdalwarp -co "TILED=NO" -co 
"COMPRESS=LZW" (or other compression alg.) creates tiffs bigger than 
"COMPRESS=NONE".

3. Mind that gdal_translate -co "TILED=YES" still outperforms gdalwarp 
-co "TILED=YES", any compression. With the sample [2] it creates a TIFF 
over 8% smaller. Not *very* much, but with 13 such tiffs gdal_translate 
gives you a room on your hard disk for another one, compared to gdalwarp.

[1]http://arcpadteam.blogspot.com/2006/08/raster-tips-1-choosing-raster-format.html
[2]http://www.biol.uni.wroc.pl/sieczka/udostepnione/M-33-21-A-b-4.tif

Maciek