[Qgis-user] Re: Projection of Shapefile export

Tue Oct 5 17:21:20 PDT 2010

  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
>
>
>
> -- 
> *ROLAND HILL*
> *Director*
> *Four Winds Technology Pty Ltd*
> *Ph/Fax :  +61 (0)2 6366 9425*
> *Mobile :  +61 (0)41 880 7472*
> *Roland.Hill at fourwindstechnology.com.au 
> <mailto:Roland.Hill at fourwindstechnology.com.au>*
>
> *Privacy and Confidentiality Notice*
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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
>>>
>>>
>>> -- 
>>> *ROLAND HILL*
>>> *Director*
>>> *Four Winds Technology Pty Ltd*
>>> *Ph/Fax :  +61 (0)2 6366 9425*
>>> *Mobile :  +61 (0)41 880 7472*
>>> *Roland.Hill at fourwindstechnology.com.au 
>>> <mailto:Roland.Hill at fourwindstechnology.com.au>*
>>>
>>> *Privacy and Confidentiality Notice*
>>> The information contained herein and any attachments are intended 
>>> solely for the named recipients. It may contain privileged 
>>> confidential information. If you are not an intended recipient, 
>>> please delete the message and any attachments then notify the sender 
>>> of miss-delivery. Any use or disclosure of the contents of either is 
>>> unauthorised and may be unlawful. All liability for viruses are 
>>> excluded to the fullest extent permitted by law.
>>>
>>>
>>> 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
>>>>    
>>>
>>>
>>> _______________________________________________
>>> Qgis-user mailing list
>>> Qgis-user at lists.osgeo.org
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>>>      
>>

-- 
Brett Adams
Spinifex Geophysics
0438 861 974
SKYPE:brettadams_spinifex

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