[gdal-dev] Re: OziExplorer (ozf2) Files with GDAL?

[Tom Kazimiers]

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-
>
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>   
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