Jukka Rahkonen schrieb: > Oliver Eichler <oliver.eichler <at> gmx.de> writes:> > > >> AFAIK the ozi format is just referencing information to a bitmap stored in a >> known format like jpeg, png or tiff. Thus using gdal_translate is not that >> obscure to me. >> > > Hi, > > Not quite so. OziExplorer .map file it doing that, pointing out to the image > file and giving projection, datum and set of reference points for OziExplorer > moving map program. Ozf is a special file format tailored for OziExplorer and > it is the only format supported by PDA version OziExplorer. It is having > tiles, > colour palette and overviews, all good things in getting speed and low memory > need. Unfortunately it is not documented, but my guess is that tiles are pngs. > This is what the author of OziExplorer writes: > > What is the OZFx3 Image Format > > The OZFx3 format stores the image in tiles, each tile can be manipulated as a > single unit. > Advantages > * Contains a separate image for each zoom level for 25% and below. These > zoom levels are created using a bilinear filter and look good. > * Zooms of 90, 80, 75, 70, 60, 50, and 40% are created by OziExplorer and > OziExplorerCE using a bilinear filter giving good looking smooth zooms. > * Fast Initial Loading > * Small memory requirement when loaded > * The loaded tiles can be cached in memory, this allows the OZFx3 format > to > be efficiently used on slow Windows CE PDA's. > > -Jukka Rahkonen- > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev > > Jukka,
thank you for the hints. Like written in an earlyer post the tiles are 64x64 pixels each. Each pixel has the size of ony byte and is referencing a color palette. Regards, Tom _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
