[sac-forum] Re: GPS and your lot

Stan, given your needs the easiest (if not cheapest) approach probably
is to hire a surveyor. Yes, it'll cost some dough but I can't think of
any other practical way to get the accuracy you need. Maybe somebody in
SAC has a surveyor relative or friend who'd do it for the challenge and
some beer!
Dan
PS. Regarding the light beam idea, the trees you mentioned will cause
you to sight the beams at high elevation. Even if you use lasers, I
suspect that dust in the air will cause enough beam spread to degrade
accuracy beyond what you need. Also, I'm not sure you'd want
perpendicular to the (local) ground versus true vertical. Finally, note
that the trees will interfere with GPS reception.

-----Original Message-----
From: sac-forum-bounce@xxxxxxxxxxxxx
[mailto:sac-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Stan Gorodenski
Sent: Wednesday, May 31, 2006 9:34 PM
To: sac-forum@xxxxxxxxxxxxx
Subject: [sac-forum] Re: GPS and your lot

I do need the accuracy. I'm afraid your other suggestions are not 
possible. The lot is heavily treed and the sides are over 750 deep, and 
the lot has topography (if that is the right word). It is not possible 
to see very far into it. Thanks anyway for the thoughts. I had thought 
of a bright light, which would still not be possible to see through the 
trees, and I had thought of shining a beam of light straight up in the 
air at each end. With a transit, assuming the beams can be seen in our 
clear transparent skies at night and assuming the light beams are pretty

accurately perpendicular to the ground, one might be able to get lot 
locations this way. Of course, it would have to be done in the dark.
Stan


Dan Gruber wrote:

> define the objective. Why do you need to know ?the location of the 
> sides of [your] lot? to a high degree of accuracy? Suppose you only 
> knew the locations to ±10 feet, say, which is within hand-held GPS 
> accuracy. What would be the consequences of a 10 foot error? Next, is 
> it the location that?s important or the distance of each side of your 
> lot from some other fixed point, or perhaps the distance between the 
> two sides of your lot? Distance can be measured very accurately with a

> laser rangefinder or even a metal tape measure. Finally, let?s not 
> forget trigonometry. If you can find a known survey point nearby, a 
> rented or borrowed surveyor?s transit can be used (with a little trig)

> to very accurately locate the sides of your lot.
>
>

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