Chris,
Any particular Isogonic Epoch in mind, (5 years per epoch), or do you want
to program the entire math model of the International Union on Geodesy and
Geophysics for Terrestrial Geomagnetism into your MapInfo application?
http://www.NIMA.mil used to have some stuff that you could download, but it
was so much source code, it would choke a horse! What you propose is a
whole lot easier said than done.
I used to telephone the GeoMagnetism Branch of NOAA in Boulder, Colorado for
specific tabulations of Magnetic Declinations of particular spots, but it's
pretty hairy to try yourself. People get Post-Docs in this stuff ...!!
Good luck!
Clifford J. Mugnier ([EMAIL PROTECTED])
Surveying, Geodesy, & Photogrammetry
Dept. of Civil & Environmental Engineering
LOUISIANA STATE UNIVERSITY
12408 CEBA Building
Baton Rouge, Louisiana 70803
Voice: (225) 388-8536
Facsimilie (225) 388-8652
- - - - - - - - and - - - - - - - -
Clifford J. Mugnier ([EMAIL PROTECTED])
The Topographic Engineering Laboratory
Dept. of Civil & Environmental Engineering
UNIVERSITY OF NEW ORLEANS
New Orleans, LA 70148
Voice: (504) 280-7095
Facsimile: (504) 280-5586
----- Original Message -----
From: "PERRY Chris" <[EMAIL PROTECTED]>
To: "MapInfo-L (E-mail)" <[EMAIL PROTECTED]>
Sent: Sunday, 19 March, 2000 11:07 PM
Subject: MI Magnetic bearings
> Hi listers,
>
> Can anyone point me to web resources or applications / formulas /
> methodologies for converting magnetic bearings to grid bearings (AMGs
> particularly). What I want to do is create an application which will
> automatically convert between magnetic and grid bearings if possible (ie
> automatically calculate the magnetic declination at the current date and
> location...)
>
> Thanks,
>
> Chris Perry
> Systems Development CoOrdinator
> Parks Victoria
> Melbourne, Australia
> Ph: 61 3 9816 6800
> Fax: 61 3 9816 9876
> [EMAIL PROTECTED]
>
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