RE: [OpenMap Users] Constants in Geo.java, WGS84

Thanks for the quick response, Don.

These numbers may be more accurate than WGS84, but in the interest of compatibility (especially with DoD systems) it might be a good idea to have the GRS80, WGS84, and other Ellipsoid values defined somewhere, and allow users to set them as the default if neccessary.

Todd

Todd A Webb <twebb@titan.com>
The Titan Corporation
3033 Science Park Road
San Diego, CA 92121
858.597.9128

-----Original Message-----
From: Don Dietrick [mailto:dietrick@bbn.com]
Sent: Wednesday, May 12, 2004 1:18 PM
To: Ken Anderson; Webb, Todd
Cc: Openmap-Users (E-mail)
Subject: Re: [OpenMap Users] Constants in Geo.java

Hi Todd,

The code references
http://www.gfy.ku.dk/%7Eiag/HB2000/part4/groten.htm, which lists these
numbers as

Equatorial radius of the Reference Ellipsoid (mean equatorial radius of
the Earth) in the zero-frequency tide system (Bursa et al. 1998)
(6378.13662 KM)

and

Polar flattening computed in the zero-frequency tide system, (adopted
GM, w , and J2 in the zero-frequency tide system) (298.25642).

Seems like this is a different datum than WGS 84 and my impression is
that these should be changed in the OpenMap Geo class to match WGS 84,
or at least be settable.

Ken, comments? I just don't know the background of your choosing those
values.

- Don

=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Don Dietrick, dietrick@bbn.com
BBN Technologies, Cambridge, MA
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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