Hi,
In Grass 6.2, Ubuntu build (yes, there's a more recent version but not yet for the right build), when importing ECWs in r.in.gdal, I receive the "not a supported file format" error. Any ideas?
The same error occurs with Globe DEM files (although Globe DEM has been reorganised and I'm not sure I have found the right header files).
Richard Chirgwin
Richard Chirgwin wrote:
In Grass 6.2, Ubuntu build (yes, there's a more recent version but not
yet for the right build), when importing ECWs in r.in.gdal, I receive
the "not a supported file format" error. Any ideas?The same error occurs with Globe DEM files (although Globe DEM has been
reorganised and I'm not sure I have found the right header files).
Your copy of GDAL has to be built with support for those formats. Once it
is, r.in.gdal should be able to read it.
check with:
gdalinfo --formats
if ECW is not there you will need to rebuild GDAL with support for those.
I am pretty sure that ECW support is not built by default.
see http://www.gdal.org/frmt_ecw.html
Now that ERmapper has been bought by Leica (apparently erdas has too),
obtaining the SDK has changed as they have a much different view of open
source:
"Product enhancements, including:
* no more restrictions on the distribution of 'Server Software' under
the GPL-style Public Use License Agreement"
.... but what has that been replaced by? Moved to BSD-like or proprietary?
The binary SDK is only available for Windows, so you may be forced to use
GDAL for Windows to export to GeoTiff. ? Hopefully the new license is
usable for Linux, I don't know. They still offer the source, which is
encouraging.
good luck,
Hamish
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Hamish wrote:
Richard Chirgwin wrote:In Grass 6.2, Ubuntu build (yes, there's a more recent version but not yet for the right build), when importing ECWs in r.in.gdal, I receive the "not a supported file format" error. Any ideas? The same error occurs with Globe DEM files (although Globe DEM has been reorganised and I'm not sure I have found the right header files).Your copy of GDAL has to be built with support for those formats. Once it is, r.in.gdal should be able to read it. check with: gdalinfo --formats if ECW is not there you will need to rebuild GDAL with support for those. I am pretty sure that ECW support is not built by default. see [http://www.gdal.org/frmt_ecw.html](http://www.gdal.org/frmt_ecw.html) Now that ERmapper has been bought by Leica (apparently erdas has too), obtaining the SDK has changed as they have a much different view of open source: "Product enhancements, including: * no more restrictions on the distribution of 'Server Software' under the GPL-style Public Use License Agreement" .... but what has that been replaced by? Moved to BSD-like or proprietary? The binary SDK is only available for Windows, so you may be forced to use GDAL for Windows to export to GeoTiff. ? Hopefully the new license is usable for Linux, I don't know. They still offer the source, which is encouraging. good luck, Hamish
Thanks, Hamish - I didn’t realise about the build issue. It may be easier to avoid ECW!
However, I have overcome the Globe DEM problem by using a different download method…
Richard
I didn't realise about the build issue. It may be easier to avoid ECW!
If you are worried about using ECW long-term ask about it on the GDAL
mailing list before you do anything too drastic; you'll get better advice
from the folks there.
Hamish
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On Tue, 2008-04-22 at 00:43 -0700, Hamish wrote:
Richard Chirgwin wrote:
> In Grass 6.2, Ubuntu build (yes, there's a more recent version but not
> yet for the right build), when importing ECWs in r.in.gdal, I receive
> the "not a supported file format" error. Any ideas?
>
> The same error occurs with Globe DEM files (although Globe DEM has been
> reorganised and I'm not sure I have found the right header files).Your copy of GDAL has to be built with support for those formats. Once it
is, r.in.gdal should be able to read it.check with:
gdalinfo --formatsif ECW is not there you will need to rebuild GDAL with support for those.
I am pretty sure that ECW support is not built by default.
see http://www.gdal.org/frmt_ecw.htmlNow that ERmapper has been bought by Leica (apparently erdas has too),
obtaining the SDK has changed as they have a much different view of open
source:
"Product enhancements, including:
* no more restrictions on the distribution of 'Server Software' under
the GPL-style Public Use License Agreement".... but what has that been replaced by? Moved to BSD-like or proprietary?
The binary SDK is only available for Windows, so you may be forced to use
GDAL for Windows to export to GeoTiff. ? Hopefully the new license is
usable for Linux, I don't know. They still offer the source, which is
encouraging.good luck,
Hamish
The ecw lib has never been offered under a true open source license.
The old license allowed "open source GPL style" use for non commercial
use only. The new license is much more restrictive in some ways.
Certainly gdal can be compiled against the old ecw code. I'm not sure
about the latest ecw lib releases. Either way it's up to you to
determine your licence rights. Beware the old license is inconsistent,
vague, internally contradictory and generally doesn't parse well. FWIW,
I believe it's worth trying to avoid depending on ecw if this is an
issue for you. Having said that, avoiding ecw may well not be a viable
option, in which case you may have to look at a commercial license for
it.
HTH,
Tim Bowden
Tim Bowden said :
The ecw lib has never been offered under a true open source license.
The old license allowed "open source GPL style" use for non commercial
use only. The new license is much more restrictive in some ways.
Certainly gdal can be compiled against the old ecw code. I'm not sure
about the latest ecw lib releases. Either way it's up to you to
determine your licence rights. Beware the old license is inconsistent,
vague, internally contradictory and generally doesn't parse well. FWIW,
I believe it's worth trying to avoid depending on ecw if this is an
issue for you. Having said that, avoiding ecw may well not be a viable
option, in which case you may have to look at a commercial license for
it.
My understanding is that ecw and jpeg2000 share some compression
technology. Is jpeg2000 a viable replacement for ecw? Are the
liscencing conditions for jpeg2000 more favourable for
open source?
nick
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nicholas.g.lawrence@mainroads.qld.gov.au wrote:
Tim Bowden said :
The ecw lib has never been offered under a true open source license.
The old license allowed "open source GPL style" use for non commercial
use only. The new license is much more restrictive in some ways.
Certainly gdal can be compiled against the old ecw code. I'm not sure
about the latest ecw lib releases. Either way it's up to you to
determine your licence rights. Beware the old license is inconsistent,
vague, internally contradictory and generally doesn't parse well. FWIW,
I believe it's worth trying to avoid depending on ecw if this is an
issue for you. Having said that, avoiding ecw may well not be a viable
option, in which case you may have to look at a commercial license for
it.My understanding is that ecw and jpeg2000 share some compression
technology. Is jpeg2000 a viable replacement for ecw? Are the
liscencing conditions for jpeg2000 more favourable for
open source?
Nick,
JPEG2000 fills a similar role to ECW (or MrSID) - a lossy high compression
format. There are several implementations of JPEG2000 (as opposed to only
one I know for ECW) which is good. One or two are true open source including
the JasPer library which is used in the GDAL JPEG2000 driver. There are
also three other GDAL JPEG2000 drivers based on proprietary libraries.
They are the MrSID SDK, the ECW SDK and the Kakadu library (JP2MRSID,
JP2ECW and JP2KAK drivers respectively).
Unfortunately the JasPer library is not suitable for large geospatial
images because it assumes the whole image can be decoded in memory. So
this is only useful if you work with very modest sized images.
This leaves us, for the time being, in the position where there is no
good GDAL JPEG2000 driver that is truely open source. However, at least
you have more options with JPEG2000.
Best regards,
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