Thank you Frank, I'll try it! Attila
Frank Warmerdam írta: > Berényi Attila wrote: >> Dear All, >> >> Is there any possibility to use ERDAS .rrd file in Mapserver focusing >> on the pyramid function? >> A bit detailed information: I have a lot of georeferenced orthophotos >> and I'm looking for the best way it display them via Mapserver as >> fast and as detailed as possible. >> I've tried gdal_retile, but it's slow, and I don't really understand >> how it works... >> Any suggestion would be very much appreciated! > > Attila, > > Generally speaking Mapserver should already take advantage of .rrd > pre-built overviews. If you want to confirm if GDAL (and consequently > MapServer) can see the overviews, run the gdalinfo utility on the base > file, and check the report of the individual bands to see if they have > an overviews list. > > For example > > gdalinfo image_col.img > ... > Band 1 Block=64x64 Type=UInt16, ColorInterp=Undefined > Description = Layer_1 > Min=232.000 Max=1024.000 > Minimum=232.000, Maximum=1024.000, Mean=335.990, StdDev=26.558 > NoData Value=65535 > Overviews: 692x600, 345x299, 171x148, 84x73, 41x35 > ... > > This file has an .rrd ith 5 overview levels and they would be used > by MapServer as long as the .rrd file is kept with the .img file. > > Best regards,
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