[OpenMap Users] GeoArray.area redux

From: Sutphin, William B CIV NUWC NWPT <william.sutphin_at_navy.mil>
Date: Mon, 24 Jan 2011 14:01:17 -0500

Hi

I am still having problems using area.

I've simplified my shape to

29.8 -80.7
29.8 -80.6
29.6 -80.6
29.6 -80.7
29.8 -80.7

This is about 83 square miles by my hand calculations, or 72 NM^2.

The value returned from GeoArray.area is -1.5712.

The value returned from Geo.nm(-1.5712) is -5401.4

I having a hard time getting consistency with other shapes

Do the points need to be in any order? What else should I do with square radians to turn it into square NM.

Thanks!

Bill Sutphin
Naval Undersea Warfare Center, Division Newport
Bldg 1351, Room 211C
Newport, RI  02841
(401) 832-5813
DSN 432-5813

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Received on Mon Jan 24 2011 - 14:12:24 EST