Bill,
I am a Town Planner in Hong Kong. Not a surveyor.
My experience is limited to the urban context.
Land resources are very expensive and we have a lot
of expensive land at hill side. For building land, due to
the limitation that human beings cannot sleep like monkey
but we prefer a sofa or a bed, which are all flat.
So we calculate land value based on the Gross Floor Area
after development.
Gross Floor Area = horizontally projected land area x
plot ratio (say 5 times for 10 storeyed
with 50% site coverage,
i.e. 50% of land will be open garden)
So, for property boundary, use horizontally projected distance.
But for planning the water pipe along slope boundary,
should use cosine value or the water pipe would become too
short and make a contractual dispute.
In fact, we do not simply use horizonrtally projected plan area but use
1:1000 or as large scale as 1:200 survey map
(or survey sheets) with cooridinartes for corners and terrians on that.
The case might be different for evaluating agricultural land for special
cultivation which I am not expert. But which is more cheaper and also
general terrain is also strips of 'flat' land.
Stanley Ng
City Country Consultancy Limited, Hong Kong
Tel: (852)27409680 Direct line: (852)92379718 Email:
[EMAIL PROTECTED]
Fax: (852)27891758
Web: www.mapsaia.com
Email: [EMAIL PROTECTED]
> ----- 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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