Jukka, thank you for the reminder on -t_srs, I had forgotten about that. It makes sense if using the shapefile index to build that in the srs you plan to output. Now that I have been reminded of that feature of gdaltindex I can see that would be faster than parsing a large vrt file. Thanks.
On Fri, Jun 27, 2014 at 1:14 PM, Even Rouault <even.roua...@mines-paris.org> wrote: > 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:mwkor...@gmail.com> > > Lähetetty: 27.6.2014 21:57 > > Vastaanottaja: mapserver-users<mailto:mapserver-users@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. > > -- > Geospatial professional services > http://even.rouault.free.fr/services.html >
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