From: Michael Lake (mikel_at_speleonics.com.au)
Date: Sat Jan 27 2001 - 02:32:57 CET
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Julian Todd wrote:
> 2) Azimuth (measured at a point: the angle of between a line and the
> gravitational field)
Inclination not azimuth.
> 3) Bearing (measured at a point: the horizontal angle between a line and
> magnetic north)
Azimuth: 0-360 where 0 is North
Bearing: 0-90 and is the angle within a quadrant.
> Consider the Depthguage measurement. It has a place, value, units, time,
> instrument-id and person-id.
The later are properties of an instrument and a surveyor not of a measurement.
This is an abstract thing but I think it important to get the abstrct entities
sorted out and not have thw wrong properties attached to an element.
This will be difficult to do.
> The time (incl date) is quite an interesting attribute because the water
> level can change from year to year. Other measurements are more static.
Thats interesting. I had not thought if that.
> Personally, I don't think these higher level groupings are anything more
> than a figment of our imaginations, but that's my own opinion.
True. They are abstractions that place a structure on the data that makes
it ammenable to more intelligent subsequent processing.
> I'll be off Email for a while, so fill my box to overflowing while I'm gone.
:-) hehehehe....
Mike
-- -------------------------------------------------------------------- Michael Lake Active caver, Linux enthusiast and interested in anything technical. Safety Convenor, Australian Speleological Federation Owner, Speleonics (Australia) --------------------------------------------------------------------
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