Re: Air and Water pressure measurements

On Thu, 11 Jan 2007 18:19:18 -0800, linnix wrote:
Rich Grise wrote:

The ground is subject to movement.
Computer readable barometer would be acceptable.

Is there a benchmark nearby, and maybe a surveyor in town?

Yes, I think they charge $500 (or more) per visit. We can't ask them to
come everyday.
They surely wouldn't come after a heavy rain storm, when we need the
measurements.

Hey - here's a brainstorm - just anchor your posts, and put a little
corner reflector at the top of each one at a calibrated height above
ground, and track them with raster-scan LIDAR. ;-)

PS: In response to your other post, mmm is my short hand for m * m * m or
cubic meters.

Ah! Thanks. :-) In the US, I've seen m^3 or such.

But, if you find a benchmark, you'd only need the surveyor once, to set
your reference point. (I hope the thing I'm thinking of is called a
"benchmark" - it's a reference point of some kind that surveyors use
so they know where stuff is at, and it's supposed to be accurate to
some ridiculously tight tolerances. If there are expensive houses
there, there is very likely one nearby.)

But, I'm also thinking; isn't there differential GPS, that can get
within centimeters? How hard would it be to get Z axis information from
their signals?

Good Luck!
Rich

.

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