That's unfortunate. Good to know its repeatable. At least the problem
has been isolated and we know what's required to get it fixed (or so I
think).
Time to find some professional help. I'll keep you informed.
Brett
On 5/10/2010 11:36 AM, Roland Hill wrote:
Brett,
I am using Linux and from a previous email I think Ken is as well.
Yes, it is working on my Linux system.
I tried installing QGIS onto a Windows 7 system using both the
Standalone and OsGeo installers. In both cases I couldn't get it to
work correctly. The standalone installer version placed AGD66 and
GDA94 versions of my test point 11m apart when it should be more like
200m. The OsGeo version just refused to display the AGD66 point.
I am not sure where to go with it on Windows. I haven't used it for a
long time. Maybe someone more familiar with the Windows setup can help.
Cheers,
Roland
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On 04/10/10 17:06, Brett Adams wrote:
Roland / Ken,
Sorry to disappear like that. Got called into the dessert for a few days.
I tried loading these new files up but can't get them to work. All
three projections are now plotting in exactly the same place.
Ran a search on the QGIS directory and replaced the AGD84 / AGD66 gsb
files with the new ones. Also replaced the srs.db file.
I'm assuming you both got this to work. Am I missing a step?
Brett
On 24/09/2010 7:25 PM, Roland Hill wrote:
Ken / Brett,
The only thing we know for certain is that we are all out of our
depths! Regardless, I think we are on the way to solving this.
Please find a new srs.db here
http://dl.dropbox.com/u/9546967/srs.db. The new file incorporates
both towgs84 parameters and a reference to the distortion files. The
distortion file values appear to take precedence, but I have
included the towgs84 parameters as it looks like the AGD84
distortion files do not cover the states and territories that did
not adopt AGD84. Note that I have changed the AGD66 towgs84
parameters to national ones (previously ACT) according to this
document (page 31) http://www.icsm.gov.au/gda/gdatm/gdav2.3.pdf.
To use the distortion files you need to place these files
http://dl.dropbox.com/u/9546967/agd66.gsb
http://dl.dropbox.com/u/9546967/agd84.gsb in your Proj data
directory (/usr/share/proj on Linux). It is the directory containing
the 'epsg' and 'proj_def.dat' files. Make sure that this is the
directory your Proj installation is actually using by checking the
contents of the PROJ_LIB environment variable (echo $PROJ_LIB). It
may not be set, which is OK. It took me about 4 hours to figure out
I had set it to an old development directory several years ago!
Note that I did try it without the +wktext parameter. It works in
Proj (using cs2cs), but QGIS needs it.
Let me know how it goes on your test points.
Cheers,
Roland
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*Four Winds Technology Pty Ltd*
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On 24/09/10 07:27, Ken Norris wrote:
Roland,
I incorporated your srs.db but the translation falls about 30m short (in
Melbourne) and about the same distance out at a control point in southern
Tasmania.
I see you use the National parameters that '... have an estimated accuracy
of about 1 metre.' and are most accurate around Canberra (surprise).
Geoscience recommend use of their distortion tables (xxx.gsb) for more
accurate work Australia-wide.
Can you incorporate the parameter reference to the distortion tables in the
srs.db? I, like Brett, am out of my depth here.
Regards
Ken
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