[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
MAIL PROTECTED] On Behalf Of Ronning,
Christine
Sent: Thursday, February 16, 2006 7:39 PM
To: mapinfo-l@lists.directionsmag.com
Subject: [MI-L] Area Calculations
Hi all,
I'm calculating the area of some boundaries, and have noticed that when I
change the Map > Options > Distance/Area using:
Hi all,
I'm calculating the area of some boundaries, and have noticed that when
I change the Map > Options > Distance/Area using: from Spherical to
Cartesian the area calculation is the same. Shouldn't it be different
and does anyone know how to change this setting so it reflects the
different me
I would like to calculate the area of several polygons which are in
Lat/Long Nad83 system and range in size from small islands to much larger
areas.
I recall others indicating they came across discrepancies
with MapInfo's area calculation. I checked out the MI-L archives
concerning area calculati
http://www.efg2.com/Lab/Graphics/PolygonArea.htm
Kind regards
Uffe Kousgaard
www.routeware.dk
___
List hosting provided by Directions Magazine | www.directionsmag.com |
To unsubscribe, send e-mail to [EMAIL PROTECTED] and
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
City Council
-Original Message-
From: Robert Crossley [mailto:[EMAIL PROTECTED]]
Sent: 12 March 2002 06:41
To: MapInfo List
Subject: MI-L Area Calculations
Can anyone point me in the direction of a formula or technique to calculate
an area of irregular shapes (no holes), from a
li
Can anyone point me in the direction of a formula or technique to calculate an area of
irregular shapes (no holes), from a
list of coordinates - without a GIS? The answer can be in square coordinate units.
The formulae uncovered so far
indicate a rather manual subdivision of the shape into t
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
cc:
Subject: MI-L area calculations
Listers,
I've got a couple of questions relating to buffers and the way
Listers,
I've got a couple of questions relating to buffers and the way MI calculates
their area.
1. MI seems to approximate circular buffers with multi-sided polygons. Can
it not just draw a circular buffer?
2. I've got a table of buffers whose native projection/datum is Lat/Long
NAD83. I chan
Hello All,
I'm having problems with calculating the total area of a number of pieces of
land.
I have set MI v.6.0 to calculate Distance/Area using 'Cartesian'. When I use
Update column with 'CartesianArea(obj, "sq m)', then use 'Calculate
Statistics', I get a total area of 3,730,049.05 m2.
If
12 matches
Mail list logo
