Martin Desruisseaux wrote:
> Jody Garnett a écrit :
>> From the GeoTools library level both implementations are treated the
>> same - as implementations of GridCoverageReader.
> Actually we don't have a common GridCoverageReader interface yet.
> GeoAPI defined such an interface, but we did so only because it was
> part of OGC 01-004 ("Grid Coverage implementation specification").
> This is one of the few metadata / referencing / coverage interface I
> never tried to implement.
>
> As far as "coverageio" is concerned, its present focus is toward J2SE
> ImageIO API only - it is not yet commited to any GridCoverageReader
> API, so the doors remind open in this area.
Okay ... so we are happy with the now ISO based GridCoverage interface;
and everything else is on the table. Got it.
At a pragmatic level everyone is making use of the GridCoverageReaders
directly using new; uDig was forced to go with the Abstract base class
as the only common denominator with the existing implementations.
>> The uDig community may of given you the impression that imageio-ext
>> work was more focused on performance (because that is what we are
>> excited about over there). At a low level they are all doing the same
>> scientific work and take this stuff very seriously.
> imageio-ext supports a wider range of formats than coverageio, which
> is still more focused on the fundation rather than supporting many
> formats.
>
> However coverageio focus on performance maybe through more complex
> structures, with stuff like a RTree for managing the tiles in a
> mosaic, image mosaic built directly at ImageReader.read(...) step
> rather than as separated images assembled afterward with JAI "Mosaic"
> operation, multi-threading, etc. The complexity of those structures
> make coverageio slower to develop and to debug, but the execution
> speed is not bad.
Sounds great, competition on the implementaitons and collaboration on
the common api - exactly where an open source project wants to be.
Cheers,
Jody
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