Re: Survey Drawing using Perches


Richard wrote:
On 11 Jul 2006 08:27:57 -0700, Harvey Schmidlapp wrote:

I suppose my question was a bit ambiguous. I'll just assume
that the statement in question is just wrong at least until I
have a chance to make a few measurements.

Restating the document scale: One inch equals twenty "P". So
what is the area of the drawing in square inches? Multiply by
400 and you should have the rough area of the land in (square)
perches . . . if the document is correct, and if "P" is a linear
Perch.

But then I read Brian Nixon's explanation of "75 acres AND 45
(square) perches" which seems to make sense. If your property
area as measured comes to roughly 75.28 acres (exactly 12,045
perches) then you have a genuine typo.

Yes, I think that must be it. The property is most likely 75 acres, 45
perches (i.e. about 75.28 acres) in size. That makes sense. I was
reading these as two equivalent numbers, but it's more likely as you
and Brian suggest. Something like saying 12 feet, 3 1/2 inches.

Calculating the area from the map is not so simple because it's nothing
close to a rectangular property. It has about 25 sides varying in
length from a few to over 80 perches.

I wrote a script that takes the angles and side lengths of a survey
drawing and converts that to x,y coordinates and draws an SVG
(http://www.w3.org/TR/2003/REC-SVG11-20030114/) drawing. It worked
fine on the simple, almost rectangular property where I live.
Unfortunately, the shape for this one in Pennsylvania doesn't close.
My guess is that the angle measurements are not as accurate as they
need to be. They are only measured to the quarter degree. The side
lengths seem much more accurate, to the 100th of a perch (just under 2
inches).

Anyway, I consider the mystery solved. 75 acres, 45 perches - a.k.a.
75.28 acres. Thanks.

--
H

.

Relevant Pages

  • Re: Survey Drawing using Perches
    ... But then I read Brian Nixon's explanation of "75 acres AND 45 ... perches) then you have a genuine typo. ... almost rectangular property where I live. ... My guess is that the angle measurements are not as accurate as they ...
    (sci.engr.surveying)
  • Re: Survey Drawing using Perches
    ... have a chance to make a few measurements. ... 400 and you should have the rough area of the land in (square) ... But then I read Brian Nixon's explanation of "75 acres AND 45 ... perches) then you have a genuine typo. ...
    (sci.engr.surveying)