[mapserver-users] large # of GeoTiffs mapfile/index strategy

[Even Rouault]

Le vendredi 27 juin 2014 22:01:37, Rahkonen Jukka (Tike) a écrit :
> Hi,
> 
> Use gdaltindex with -t_srs http://www.gdal.org/gdaltindex.html and all your
> troubles are solved.

Jukka's advice is good, make sure to use MapServer 6.4 for mixed SRS support. 
You'll likely have to use -t_srs EPSG:4326 to have a SRS that is compatible 
with 9 UTM zones (or any other global SRS).

There's no spatial index mechanism within VRT files. If the number of files in a 
VRT is reasonnably small (let's say < 100), the performance should still be OK 
hopefully.

> 
> Jukka Rahkonen
> 
> ________________________________
> Lähettäjä: Mark Korver<mailto:mwkorver at gmail.com>
> Lähetetty: ‎27.‎6.‎2014 21:57
> Vastaanottaja: mapserver-users<mailto:mapserver-users at lists.osgeo.org>
> Aihe: [mapserver-users] large # of GeoTiffs mapfile/index strategy
> 
> Hi Experts,
> I need a little advice on how to do lots of aerial image GeoTiffs quickly.
> I have a large region with many GeoTiffs covering 9 UTM zones. Typically I
> would put together a map file with layers per utm zone and use shapefile
> index to point at the GeoTiffs. I know that declaring the extent per layer
> is important when you have a lot of layers. The GeoTiffs are RGB,
> internally tiled, and jpeg compressed. They are also about 20-30MB in
> size.
> 
> My question is, has anyone done any testing between doing this via
> shapefile index vs GDAL .vrt files? Which would perform faster? My current
> setup is using Mapserver behind nginx in fastcgi mode.
> Thanks for any help on this.

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