Nicholas
I was interested about similar things a few weeks ago and got quick help
in this forum. As jean-Claude already mentioned there's a header editor
for Windows that allows you to see/edit the datum and projection info.
Jean-Claude also created a tool "ecwhed" that allows you to get and set
these parameters via the command line, at least under Linux it compiles
easily, it requires the ECW SDK.
If you create ECW's via GDAL you should use the options -co "PROJ=..."
and -co "DATUM=..." to be sure what GDAL writes to the ECW header. For
reading ECW files GDAL uses the definitions in the file "ecw_cs.wkt" (on
Unix under /usr/local/share/gdal/). There you can add your own
projections and datums or modify existing ones, eg. adding datum shift
parameters. Programs that use GDAL for raster rendering like QGIS or
ArcGis 10 can also work with these new projection definitions if you add
them to their own "ecw_cs.wkt" file, Mapserver takes the file of the
GDAL installation.
Regards
Armin
On 28/06/2011 03:09, nicholas.g.lawre...@tmr.qld.gov.au wrote:
Hello all,
Does anyone know where the datum and projection information is stored
inside an ecw?
Kind regards,
*
Nicholas Lawrence*
Senior Spatial Science Officer | Darling Downs Region / Toowoomba Office *
Assets & Operations* Division | Department of Transport and Main Roads
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