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Seven Parameter Bursa Wolf Equation

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Steve Loper

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Jun 9, 1998, 3:00:00 AM6/9/98
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Hello,

I am developing field data collection software, and I need to allow my
user to automatically convert their GPS data from WGS84 to other
datums. I have been looking for information on the seven parameter
Bursa Wolf equation, but have been unable to find it. If anyone could
point me in the right direction, I would appretiate it.

Steve Loper
Amadeus Consulting Group

Eric Collins

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Jun 10, 1998, 3:00:00 AM6/10/98
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look at the geocalc.dll from www.bluemarblegeo.com

Don't re-invent the wheel...

Cliff Mugnier

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Jun 10, 1998, 3:00:00 AM6/10/98
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Steve Loper wrote:
>
> Hello,
>
> I am developing field data collection software, and I need to allow my
> user to automatically convert their GPS data from WGS84 to other
> datums. I have been looking for information on the seven parameter
> Bursa Wolf equation, but have been unable to find it.


Steve,

Go to the Australian Land Information Group (AUSLIG) page. They have
the mathematical documentation with free software (and source code) that
will run in EXCEL. Be careful of the commercial packages that claim
this capability, many of the "biggie" packages are garbage.

Note that there are different conventions for the direction of rotation
used in different implementations of the "Bursa-Wolf." Leica uses the
European convention, Australia uses the more common American
convention. Which GPS package your potential client uses requires
specific sign conventions.

Note that the Molodensky model is also commonly used. I have used both,
depending on the distance to the origin of the classical datum. There
are a few around that prefer the Veis model, (all of the above use seven
parameters).

Be careful.

Cliff

--
Clifford J. Mugnier (cj...@uno.edu)
The Topographic Engineering Laboratory
Department of Civil and Environmental Engineering
UNIVERSITY OF NEW ORLEANS
New Orleans, Louisiana 70148

Voice and Facsimile: (504) 280-7095

Mike MacInnis

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Jun 28, 1998, 3:00:00 AM6/28/98
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> Cliff Mugnier <cj...@uno.edu> wrote in article
<357EABA3...@uno.edu>...


> Steve Loper wrote:
> Go to the Australian Land Information Group (AUSLIG) page. They have
> the mathematical documentation with free software (and source code) that
> will run in EXCEL. Be careful of the commercial packages that claim
> this capability, many of the "biggie" packages are garbage.

I looked for that software at the AUSLIG website, but couldn't find it.
Any ideas where it could be hidden?.


--
Mike MacInnis
Eagle Surveys/Omni Corp.
eagle...@tyler.net

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