Hi All,
I successfully managed to connect MGOS to a rasterlite db using FDO GDAL
Provider.
Rasterlite is a library designed to give fast read access to large
raster dataset. Data are stored in a sqlite db. When loaded into the db,
raster are automatically tiled and pyramidal set of overview can be
built. Follow the link below for better explanation.
http://www.gaia-gis.it/spatialite
http://www.gdal.org/frmt_rasterlite.html
Since GDAL Provider shipped with MGOS is not built with rasterlite
support, I have followed the instruction to add ECW, MrSID as per
http://trac.osgeo.org/mapguide/wiki/MGOS22GdalProvider
Since I tested it with MGOS 2.5 I grabbed the needed dll from:
http://www.gisinternals.com/sdk/PackageList.aspx?file=release-1600-gdal-1-9-0-mapserver-6-0-1.zip
If you want to give it a try you can use the gdal utilities to create a
new rasterlite db (from a large geotiff for example):
gdal_translate -of Rasterlite <yourfle.tiff>
RASTERLITE:<filename>.sqlite,table=source -co DRIVER=JPEG -co
BLOCKXSIZE=1024 -co BLOCKYSIZE=1024 -co QUALITY=100
gdaladdo RASTERLITE:<filename>.sqlite,table=source 2 4 8 16
After that you just have to create a new GDAL feature source using
Maestro and select the newly created sqlite file.
I made a little test with a small (20000x10000) jpeg, performance are
nearly 10 times better compared with original raster used as is.
Hopes it helps :)
Riccardo Pucci
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