[Qgis-developer] RE: ECW!!!

[Even Rouault]

Selon Fred ETHEVE <fred.etheve at wanadoo.fr>:

> Hi,
> May we develop an Opensource .ECW, for example .OCW, with sources of
> epsilon!?

Well, you might just start by testing the files produced by Epsilon before
inventing a new format ;-) As far as the ECW format itself, I don't think there
will be an opensource implementation for the decoder because the format is
non-documented, and even if it was documented, there are a few patents floating
around which might prevent implementing it in countries allowing software
patents (USA...)

> Because working with larges rasters as 100 000 x 100 000 is now current, and
> it's not easy to manipulate .TIF > 30 Go!

You can try TIF with JPEG compression to reduce the size a bit, or use JPEG2000
that begins to have viable OpenSource implementations, like OpenJPEG, although
still significantly slower than proprietary implementations.

> Best regards
>
> -----Message d'origine-----
> De : Even Rouault [mailto:even.rouault at mines-paris.org]
> Envoyé : vendredi 23 mars 2012 14:15
> À : Fred ETHEVE
> Cc : 'Jože Detečnik'; 'qgis-developer'
> Objet : RE: [Qgis-developer] RE: ECW!!!
>
> Selon Fred ETHEVE <fred.etheve at wanadoo.fr>:
>
> > Thank you, all,
> > ECW/win was OK with trunk (1.9.90) until 2 days before new nightly...
> > perhaps, since, gdal used has been 1.9???!!!
>
> Yes, you should perhaps open a ticket (if not already done by someone else)
> in OSGeo4W trac instance to ask for the gdal-ecw plugin to be regenerated
> against GDAL 1.9
>
> > It's time to have an opensource wavelets compression!!!
> > 1) Somebody knows Epsilon CW? Is -it possible with GDAL1.9 linux and win?
>
> Yes, but the Epsilon lib won't read ECWs and you have probably to build GDAL
> yourself against it because few packages will build it.
> > Sent: Thursday, March 22, 2012 8:56 PM
> > To: 'qgis-developer'
> > Subject: [Qgis-developer] RE: ECW!!!
> >
> > Hi all,
> > Big, big problem in France with ECW!
> > A lot of my students work with QGIS, and French IGN give rasters in
> > ECW formats Exists a solution to use ECW? Compiling gdal???
> > Regards,
> >
> > Fred
>
>
>