[mapserver-users] Help (tips&tricks) on raster dataset optimization

[Robert Sanson]

If disk space is not a problem hat I would do is:
 
1. Transform source files into internally tiles files using "gdal_translate -of GTiff -co TILED=YES ."
 
2. Use gdaladdo to add internal pyramids
 
3. Creat a TILEINDEX using "gdaltindex myindex.shp *.tif"
 
4. Use "shptree myindex.shp" to create a spatial index .qix file
 
5. Add a layer in the Mapserver MAP file to myindex:
 
LAYER
  NAME myorthos
  GROUP "Toposcans"
  TYPE RASTER
  DUMP TRUE
  STATUS ON
  TILEINDEX ../data/myindex
  TILEITEM Location
 
regards,
 
Robert


>>> BrainDrain <paulborodaev at gmail.com> 15/10/2009 11:04 a.m. >>>

Hi, friends. 
I need an advice to choose some way to optimize my raster dataset.
Source data: 39 geotiff files - satellite images of a city, each one is
aprox. 600 mb uncompressed rgb/~250 mb lzw. To speedup rendering in
different scales I can:
1) - transform source files into internally tiled files with gdal_translate
(lzw or deflate? lzw is faster?)
- create virtual mosaic (.vrt) with gdalbuildvrt 
- create internal overviews with gdaladdo on vrt (lzw or deflate for
overviews compression? can this method differ from method we choose earlier)
- connect to result dataset with MS (no minscale/maxscale manipulations
required? can I connect to directly to vrt or I need to create tileindex
with gdaltindex (internal overviews supported in this case by MS?)?)
2) - create external overviews (pyramid levels) of source files
- break this overviews and source files into tiles
- create tileindexes for each level of details (pyramid level) with
gdaltindex
- connect to result tileindexes with MS using different minscale/maxscale
conditions
3) - convert source files into ecw's (what compression level in % is
reasonable? good looking (vs loosless))
- connect to result dataset (can I use tileindex for ecw's?)
Have someone experience in comparing those ways?
Thanks!
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