[Qgis-user] Opening Raster from ESRI .GDB

[Even Rouault]

Le jeudi 24 juillet 2014 22:33:52, Michael Treglia a écrit :
> Even and Alex,
> 
> Thanks! That definitely clarifies some things.
> 
> I just tried two GDB files with ESRI FileGDB and OpenFileGDB in QGIS. One
> .gdb file worked fine with both ESRI FileGDB and OpenFileGDB.  The other
> didn't work with either.  I don't know what Arc version the latter was
> created in or anything, but I can try and find out and get back to you in
> the future.

That would be interesting to see that database. By chance, are you seeing 
.gdbtable.sdc files in the directory ? If so, then yes it is expected that it 
doesn't work with those (and neither the ESRI FileGDB can deal with them). 
They are very special GDB highly compressed and meant for read-only, and as a 
side effect order of magnitude more difficult to reverse engineer that the 
regular GDB.

> 
> Best regards,
> Mike
> 
> 
> On Thu, Jul 24, 2014 at 4:19 PM, Even Rouault
> <even.rouault at mines-paris.org>
> 
> wrote:
> > Le jeudi 24 juillet 2014 22:04:00, Alex Mandel a écrit :
> > > Sorta, there are 2 drivers for GDB. The open GDB that Even has been
> > > working on and the official ESRI GDB api.
> > > 
> > > The ESRI GDB api and Arc instance are not backwards compatible, once
> > > you upgrade a gdb to the latest it only works with the latest and
> > > there's often no way to write an older variant.
> > 
> > The ESRI FileGDB SDK can only read gdb that have been created by ArcGIS
> > 9.X.
> > The OpenFileGDB driver can (well, at least on all available samples I
> > have worked on). See http://gdal.org/drv_openfilegdb.html for a
> > comparison of both
> > drivers
> > 
> > > The open GDB driver I think allows you to read any version and write
> > > older versions if you need to without auto-upgrading.
> > 
> > Only reading. Writing hasn't been implemented although we probably have
> > almost
> > everything needed to implement it one day.
> > 
> > > Back to your original question does the ESRI gdb driver work for you
> > > use case for now? On windows I think you can get it with OSGeo4w on
> > > Linux you need to download the SDK from ESRI and recompile GDAL -
> > 
> > Latest OSGeo4W must have GDAL 1.11, so you won't need recompiling
> > anything. Check with "ogrinfo --formats" if OpenFileGDB shows in the
> > list.
> > 
> > > but I don't
> > > know if this is vector and raster or just vector.
> > 
> > ESRI FileGDB SDK only supports vector too. So no closed-source or
> > open-source
> > solutions for raster yet.
> > 
> > > Thanks,
> > > Alex
> > > 
> > > On 07/24/2014 12:56 PM, Michael Treglia wrote:
> > > > Hi Even,
> > > > 
> > > > Thanks a lot for the quick response - I really appreciate your work
> > > > in dealing with the GDB files!
> > > > 
> > > > That sounds great! Let me know if you need more data examples and
> > > > such.
> > > > 
> > > > Just a quick question - .gdb is not typically forward and backward
> > > > compatible across Arc versions, right? [I've definitely had .gdb
> > > > files that don't work in QGIS, while some do, so I have assumed that
> > > > it was due to versioning issues - is that right? Or should I be
> > > > doing some trouble-shooting?]
> > > > 
> > > > Thanks again, and best regards,
> > > > Mike
> > > > 
> > > > 
> > > > On Thu, Jul 24, 2014 at 3:27 PM, Even Rouault
> > > > <even.rouault at mines-paris.org>
> > > > 
> > > > wrote:
> > > >> Le jeudi 24 juillet 2014 18:19:14, Michael Treglia a écrit :
> > > >>> Hi All,
> > > >>> 
> > > >>> I've Googled around, and it seems like this isn't currently
> > > >>> possible, but wanted to check with folks on this list for any
> > > >>> solution...
> > > >>> 
> > > >>> A lot of data being produced by agencies is now available only as
> > 
> > ESRI
> > 
> > > >> .gdb
> > > >> 
> > > >>> files. A dataset I'm particularly interested in working with is a
> > > >>> gridded soil dataset (
> > 
> > http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/ref/?cid=nrcs142p2
> > 
> > > >> _05
> > > >> 
> > > >>> 3628 )
> > > >>> 
> > > >>> These particular data are in raster format, stored as Arc 10.1
> > > >>> .gdb, available from here:
> > > >>> http://datagateway.nrcs.usda.gov/GDGOrder.aspx
> > > >> 
> > > >> Mike,
> > > >> 
> > > >> When I reverse-engineered the vector part of FileGDB format that
> > > >> lead
> > 
> > to
> > 
> > > >> the
> > > >> OGR OpenFileGDB driver of GDAL 1.11, I came through a few raster GDB
> > > >> samples.
> > > >> Dealing with them was not in the scope of the work that was funded,
> > 
> > but
> > 
> > > >> from
> > > >> what I've seen, I've good hope that decoding them would be
> > > >> reachable. Would need some extra investigation of course to confirm
> > > >> and complementary funding...
> > > >> 
> > > >> Best regards,
> > > >> 
> > > >> Even
> > > >> 
> > > >>> Any suggestions are appreciated.
> > > >>> 
> > > >>> Thanks!
> > > >>> Mike
> > > >> 
> > > >> --
> > > >> Geospatial professional services
> > > >> http://even.rouault.free.fr/services.html
> > > > 
> > > > _______________________________________________
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> > 
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-- 
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