[mailto:[EMAIL PROTECTED]
Sent: Thursday, February 16, 2006 11:09 AM
To: Ronning, Christine; mapinfo-l@lists.directionsmag.com
Subject: RE: [MI-L] Area Calculations
Christine,
You say that you are calculating the area of some boundaries. How exactly are
you doing this ?
If you use Update Column, you
Christine,
You say that you are calculating the area of some boundaries. How exactly are
you doing this ?
If you use Update Column, you should specify which type of area calculation you
want by using either CartesianArea() or SpericalArea() in stead of Area().
Peter Horsbøll Møller
GIS Develope
http://www.efg2.com/Lab/Graphics/PolygonArea.htm
Kind regards
Uffe Kousgaard
www.routeware.dk
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p
Hi Rob,
Assuming (X1,Y1), (X2,Y2),(X3,Y3),.(Xn-2,Yn-2),
(Xn-1,Yn-1),(Xn,Yn) are your coordinates in Cartesian domain, your area
function would be as follow:
2x Area = X2Y1 + X3Y2 + X4Y3 + ...+YnYn-1 + X1Yn - X1Y2 - X2Y3 - ... -XnY1
Thus, Area = RHS / 2 unit square.
Good luck.
Regards
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Robert,
There are formulae out there but be prepared to remember your calculus! Try
searching the net for the green formula or the gauss-green formula.
As a s
28, 2001 8:01 AM
To: Tim Warman
Cc: Mapinfo-L; [EMAIL PROTECTED]
Subject: Re: MI-L area calculations
Tim,
The problem with circles and ellipses is that they represent unprojected
objects. In order to project the data, there needs to be discrete points
that can be projected. Especially in Lat/L
Tim,
The problem with circles and ellipses is that they represent unprojected
objects. In order to project the data, there needs to be discrete points
that can be projected. Especially in Lat/Long circles and ellipses, as
well as arcs, rectangles and rounded rectangles, should be used mainly f
