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On Tue, 22 Mar 2005, Michael Dorl wrote:

>At 10:48 PM 3/21/05 -0500, you wrote:
>>Frank
>>
>>My 2001 Garmin 76 (firmware 2.06) had book had approx. 56 datums listed.
>>
>>Bill
>>
>> > Frank,
>> >
>> > I looked into the instruction book for my
>> > GPS 48 (Dated Dec 1999) and found over
>> > 100 datums listed.
>
>I was interested in datum stuff a while ago, the best source (with XYZ
>offsets) I found was at
>
>http://www.globalsecurity.org/military/library/policy/army/fm/3-09-70/appj.htm
>
>I guess, it's part of a manual for long range artillery.  The Astronomical
>Almanac App K (page K11 - K13 in my 1998 copy) has some information on
>transforming one datum to another.
>
>I have found some references that imply there may be some rotation of the
>spin axis between datum in addition to the translation of the origin but I
>have never
>found any actual rotation numbers.
>
>If anyone could point me to actual data on such rotations or a reference
>saying there are none, I'd appreciate it.

Some examples involving older datums (not data) are shown here:
.

-- Richard Langley

>BTW, is datum plural or singular, does it have a plural?
>


===============================================================================
 Richard B. Langley                            E-mail: lang@unb.ca
 Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/
 Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142
 University of New Brunswick                   Fax:      +1 506 453-4943
 Fredericton, N.B., Canada  E3B 5A3
     Fredericton?  Where's that?  See: http://www.city.fredericton.nb.ca/
===============================================================================

   

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