On 11-06-08 11:30 AM, Armin Burger wrote:
Jean-Claude
I guess it's not only a problem of gdalinfo but of some parts of GDAL in
general dealing with the ECW.
I made some more tests and when I add the options
-co DATUM=WGS84 -co PROJ=NUTM32
to the gdal_translate call then gdalinfo identifies the coordinates correctly
afterwards, but then of course the whole projection is set to UTM...
It seems that the default value entered for DATUM is "RAW" and that seems to
cause some of the problems afterwards for GDAL. The problem for me is that I need to
insert the correct datum and projection using the syntax of ECW, and I don't know if all
available datums/projections used e.g. in Europe are supported, and which syntax to use
for the available ones.
I found on my Windows installation a file "PcskeyProjDatum.dat" with a few
definitions of projection and datum used but this was very limited and covered mainly UTM
and NAD. Most European projections and datums were missing in this file.
Armin,
GDAL skips with a file data/ecw_cs.wkt that lists many ECW
projections and datums. Perhaps it will be helpful.
There are definately problems translating coordinate system
into the ECW dictionary. A ticket for a particular case
*might* lead to some improvement but it is an iffy process.
Part of the problem in the thread mentioned by Jean-Claude
is that when the coordinate system translation fails GDAL
also gives up on read the georeferencing transform - or at
least I think it used to work this way. I think there may
have been some recent fixes in this regard. If not, a ticket
might be appropriate.
Best regards,
-------- Original-Nachricht --------
Datum: Wed, 08 Jun 2011 16:27:22 +0200
Von: Jean-Claude Repetto<[email protected]>
An: Armin Burger<[email protected]>
CC: [email protected]
Betreff: Re: [gdal-dev] gdal_translate - ECW format and non-UTM projections
Hi,
I think there is a bug in gdalinfo, I already noticed this kind of
problem, for example
<http://osgeo-org.1803224.n2.nabble.com/gdal-dev-corner-coords-in-tif-vs-ecw-td5608144.html>
You should file a bug at<http://trac.osgeo.org/gdal/> .
Jean-Claude
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