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<font size="-1"><font face="Arial">Thank you Frank, I'll try it!<br>
<br>
Attila<br>
</font></font><br>
Frank Warmerdam írta:
<blockquote cite="mid:49343548.3040203@pobox.com" type="cite">Berényi
Attila wrote:
<br>
<blockquote type="cite">Dear All,
<br>
<br>
Is there any possibility to use ERDAS .rrd file in Mapserver focusing
on the pyramid function?
<br>
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.
<br>
I've tried gdal_retile, but it's slow, and I don't really understand
how it works...
<br>
Any suggestion would be very much appreciated!
<br>
</blockquote>
<br>
Attila,
<br>
<br>
Generally speaking Mapserver should already take advantage of .rrd
<br>
pre-built overviews. If you want to confirm if GDAL (and consequently
<br>
MapServer) can see the overviews, run the gdalinfo utility on the base
<br>
file, and check the report of the individual bands to see if they have
<br>
an overviews list.
<br>
<br>
For example
<br>
<br>
gdalinfo image_col.img
<br>
...
<br>
Band 1 Block=64x64 Type=UInt16, ColorInterp=Undefined
<br>
Description = Layer_1
<br>
Min=232.000 Max=1024.000
<br>
Minimum=232.000, Maximum=1024.000, Mean=335.990, StdDev=26.558
<br>
NoData Value=65535
<br>
Overviews: 692x600, 345x299, 171x148, 84x73, 41x35
<br>
...
<br>
<br>
This file has an .rrd ith 5 overview levels and they would be used
<br>
by MapServer as long as the .rrd file is kept with the .img file.
<br>
<br>
Best regards,
<br>
</blockquote>
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