[Taxacom] GPS units that record the time a waypoint was taken, accuracy, datum

Curtis Clark jcclark-lists at earthlink.net
Mon Mar 23 09:35:49 CDT 2009

On 2009-03-23 03:03, Karl Magnacca wrote:
> Sigh...did no one read beyond the first half-sentence of my post?  I'm
> well aware that datums matter, my point was that the datum set on the
> unit when it's *recording* is of (relatively) little importance.

I guess I'm having a bit of trouble understanding that. To me, an 
extreme analogy is not knowing whether your measuring stick is graduated 
in inches or centimeters: the conversion is indeed precise, but not 
knowing which you started with is problematic. If your unit records in 
datum A, but you assume in all further work with the coordinates that 
they were recorded instead in datum B, wouldn't your results always be off?

Curtis Clark                  http://www.csupomona.edu/~jcclark/
Director, I&IT Web Development                   +1 909 979 6371
University Web Coordinator, Cal Poly Pomona

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