Changes between Version 11 and Version 12 of WKTRasterDriver
- Timestamp:
- Jul 1, 2009, 2:03:49 PM (15 years ago)
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WKTRasterDriver
v11 v12 93 93 ''If the RASTER_COLUMNS "regular_blocking" value is true then "all blocks are equal sized, abutted and non-overlapping, started at top left origin", plus additional constraints. This regular blocking capability raises the possibility of having very large contiguous raster coverages (made up of many individual WKTRaster-s) which, in turn, raises potential performance problems. Other raster formats counter this by having overviews; a concept that is already supported by GDAL.'' 94 94 95 I think that this driver must have support of overviews, because I suppose that it will be common to have large images stored at database, that will produce large datasets when reading. Anyway, this issue was being discused until May 20th (http://postgis.refractions.net/pipermail/postgis-devel/2009-May/005629.html), and the final decission seems to be having an additional table for overviews (this is the way in which Mateusz' script manage it). To follow this issue: http://trac.osgeo.org/postgis/wiki/WKTRaster/SpecificationWorking01#RASTER_OVERVIEWSMetadataTable. I'll keep an eye on it. 96 95 97 == Project plan == 96 98