FLUFF NUT!!
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Sent: 23 August 2006 18:01
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Subject: MapInfo-L Digest, Vol 10, Issue 67
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Today's Topics:
1. area calculation discrepancies (COLDREY, Cathy (Bristol))
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Message: 1
Date: Wed, 23 Aug 2006 10:34:20 -0600
From: "COLDREY, Cathy (Bristol)" <[EMAIL PROTECTED]>
Subject: [MI-L] area calculation discrepancies
To: [email protected]
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Hi List,
Does anyone have much experience in calculating areas of polygons or
circles in MapInfo?
My problem is this. I have a 1 km radius which has exactly a diameter
of 2km, meaning a 1 km radius. Now mathematically the area of theis
would be 3136860 square m. But if I use the update column option the
number I get is 3118630 square m
or double click on the object I get 3119000 square m.
I am using British national grid projection.
Can anyone explain to me why I get three differing numbers?
And also how will I find the correct areas of several other polygons
that are not circular?
Thanks for any help you can provide to this mystery.
:) cathy
Cathy Coldrey
Geomatics Specialist, Europe
WorleyParsons Komex
Environment & Water Resources
Tel: + 44 (0)117 9105 124
Fax: + 44 (0) 117 9105 139
3-8 Redcliffe Parade West
Bristol BS1 6SP
Registered No. 2718875
www.worleyparsons.com
Please note: effective immediately my new e-mail address is
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