Le lundi 02 mai 2016 13:03:34, gunnarblom a écrit : > Even Rouault-2 wrote > > >> 1) When creating a MBTiles file, only one layer is written. Can you use > >> GDAL to populate other layers? > > > > I'm not sure what you call "layer". AFAIK MBTiles files do not have a > > concept > > of storing tiles for different layers. (you could use GeoPackage for > > that) > > I'm talking about zoom layers.
Ah ok, you can generate overviews/zoom layers with gdaladdo / GDALBuildOverviews(). > >> 2) Can you choose to create 512*512px tiles > >> instead of the 256*256px default? Would increase quality on retina > >> devices. > > > > It is true that the spec doesn't say anyting about tile size, but are > > there > > MBTiles files with tiles not 256x256 ? This isn't supported by the > > driver. On > > writing this shouldn't be a big problem. On reading this might be a bit > > more > > tricky as you could potentially have a mix of tiles of different sizes ! > > I guess the MBTiles format could have metadata about what resolution the > tiles are in. It could, but this isn't standardized > But also the readers/viewers should just draw the tiles in > their correct place and shouldn't be dependent on what resolution they > have? Isn't that how it works with a regular TMS folder structure anyway? For viewers, yes. For the reader side of the GDAL driver, this is a bit difference as it needs to determine a fixed resolution per zoom layer. > > > > -- > View this message in context: > http://osgeo-org.1560.x6.nabble.com/gdal-dev-Questions-about-MBTiles-write > -support-GDAL-2-1-RC4-tp5263684p5263887.html Sent from the GDAL - Dev > mailing list archive at Nabble.com. > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev -- Spatialys - Geospatial professional services http://www.spatialys.com _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
