Hi,
I didn’t create the ECW files so you may well be right. It is odd though as
they draw fine when you request them in British National Grid; they only shift
when you reproject them.
I did try to add TMOSGB as a user-projection as I thought that might help. It
now can recognise the projection but it still doesn’t connect it up with the
native projection and the reprojection still doesn’t work. My guess is that I
need to add some sort of custom transformation for it to work or alternatively
attempt to reproject the base data into the property EPSG:27700 projection.
Many thanks for the hint though.
Paul
From: Jonathan Moules [mailto:[email protected]]
Sent: 05 April 2017 10:18
To: Paul Wittle <[email protected]>
Cc: '[email protected]'
<[email protected]>
Subject: Re: [Geoserver-users] Odd shift when rendering ECW from British
National Grid to Web Mercator
Hi Paul,
How did you create the ECW images themselves? The problem is likely in that
step rather than within GeoServer.
Cheers,
Jonathan
---- On Tue, 04 Apr 2017 14:47:44 +0100 Paul
Wittle<[email protected]<mailto:[email protected]>> wrote ----
Hi,
I’ve been trying to use ECW image mosaics and it appears that my images are
re-projecting to be offset by about 100 meters to the east. The grid squares
calculated by the server (i.e. the shapefile) can be loaded and that lines up
correctly but the ECW files are still drawing in the wrong place.
The ECW files seem to be missing the projection header if I use gdalinfo but in
both FWTools and GeoServer they are registering as TMOSGB instead of straight
forward EPSG:27700 for OSGB.
Is it possible that I’ve misconfigured something in the GeoServer or is it more
likely that I need to reconfigure the actual ECW files?
Given ECW is a proprietary format I’ve not managed to find too much help online
so I thought I’d try my luck here.
Cheers,
Paul
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