OK. Just how does a standard surveryor's equipment measure distance.
Does it count interference fringes?


Jim Macklin wrote:
You also attach a thermometer to the tape because there is a
correction for expansion. If the tape was supported by the
ground, a tension of 10 pounds was required if I remember
correctly.


"Paul Tomblin" wrote in message
...
| In a previous article, Stubby
said:
| I had my property surveyed and asked what the accuracy
was. The
| surveyor replied that 0.1 foot is the standard for most
applications and
| 0.01 foot is required for commercial, high-precision
applications.
| They use GPS (DGPS??) but I don't know how.
|
| You need a better surveyor. When I was doing road
construction layout, we
| were expected to get the marks within 5-7 millimeters.
And when they
| actually did the construction, they were allowed to be
within 2-3
| centimeters. (You've heard the expression: measure with a
micrometer,
| mark with chalk, cut with an axe.) Legal surveyors were
supposed to be
| *far* more accurate than us. For instance, we just held
the chain (that's
| the "measuring tape" to you) or laid it down on the
ground. Legal
| surveyors had a special device to make sure they were
holding exactly the
| right amount of tension on the chain because that's what
it was calibrated
| for.
|
| --
| Paul Tomblin
http://xcski.com/blogs/pt/
| ALL programs are poems, it's just that not all programmers
are poets.
| -- Jonathan Guthrie in the scary.devil.monastery