Bill,
In Australia all boundary distances are converted to a horizontal distance
on a plane surface giving a lesser area than the actual surface area in the
case of sloping land.
When and if we go to a digital cadastre, I would imagine that spherical
distances would be used and projected to a mathematical surface based on the
new Geodetic Datum of Australia (I could be wrong in this assumption and
stand to be corrected)
Regards
Peter Graham
----- Original Message -----
From: "Bill Thoen" <[EMAIL PROTECTED]>
To: "MapInfo-L" <[EMAIL PROTECTED]>
Sent: Thursday, January 20, 2000 9:05 AM
Subject: MI A Question for Surveyors
> Is there a surveyor in the house?
>
> I was wondering how property boundary line distances and acreages
> are calculated in sloping terrain. Are boundary distances
> reported as the distance along the ground surface or are they
> recorded as projections of the distance along the ground into the
> x-y plane? In other words, if a line measured between two
> monuments is 1200 ft along the ground, and one monumnet is 600 ft
> higher than the other, is that leg recorded as being 1200 ft or
> 1039.2 ft (1200*cos(30 degrees))?
>
> Given that, is acreage calculated based on surface area or as
> area projected into the X-Y plane? Seems to me if you have to
> pay $30,000/acre it would make a difference.
>
> - Bill Thoen
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