Hi,
The new versions of ECW SDK is only available on Windows (4.0 to 4.2).
The ReadOnly Windows version is free and Read/Write Windows version
(desktop and server) is profitable. I believe that there is a project of
porting SDK on Linux but it's not currently available
(http://field-guide.blogspot.com/2011/07/erdas-ecwjp2-sdk-for-linux.html) and
we don't know the coming licensing policy.
If you want to convert ECW to tif+worldfile on Linux, you need to
recompile gdal agaisnt the 3.3 ECW library (which is no longer
maintained by ERDAS since 2007). Be carreful, I noted a suspect
behaviour of this library under Linux (I will send a post this week-end
on this subject with more details). If you want, I believe you can find
ubuntu binaries of this library here :
http://geomatips.blogspot.com/2010/09/mise-jour-paquet-ecw-pour-ubuntu.html
(french website)
At last, in order to get georeferencing informations embedded in ECW
file, you can use the DATUM, UNITS**and PROJ options
(http://www.gdal.org/frmt_ecw.html - code defintion are contained in
ecw_cs.wkt file) or/and assign an EPSG code with -a_srs option in
GDAL_TRANSLATE.
Hope to help...
Best regards
Sylvain
Le 17/02/12 10:31, Zoltan Szecsei a écrit :
Hi,
I have a bunch of ecw images that I need to convert to tif+worldfile.
I therefore need to recompile gdal against the ecw libraries, but the
only file I can download from Intergraph/Erdas website is:
ECWJP2SDKSetup_RO_20110303.exe
which is a Windows install of the SDK.
How do I do this for Linux?
(Want to batch convert them on ubuntu 10.04)
On another note, I notice that the xml files received with the ecw
images only have projection info in them, and not the georeferencing
info.
Is the georeferencing info embedded in the ecw files (like geotiff)? I
tried looking in the ecw file with a binary editor, but saw nothing
obvious.
TIA,
Zoltan
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