[mapserver-users] pyramid, .rrd file

[Berényi Attila]

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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