I can't say, but there is Monterey Bay at her doorstep.
Perhaps :

Consider : http://en.wikipedia.org/wiki/Ground_truth

Metrology or remote sensing from afar; naturally having a ground reference.

Reference this against that of a known.

Often we will see a coin as a physical reference in a picture.
Consider reflected or absorbed light.  Other signatures not often made.

Martin

Dousing rod might be one tool, but that is for pond/pool use as bended
arms are needed :-)


Ellen Bulger wrote:
> I'm still wondering about this ground-truthing bit.
>
> Does it require a dousing rod?

--
Martin H. Eastburn
@ home at Lions' Lair with our computer lionslair at consolidated dot net
TSRA, Endowed; NRA LOH & Patron Member, Golden Eagle, Patriot's Medal.
NRA Second Amendment Task Force Charter Founder
IHMSA and NRA Metallic Silhouette maker & member.
http://lufkinced.com/

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