Talk:Geodetic Reference System 1980

(Redirected from Talk:GRS 80)
Latest comment: 4 years ago by 89.204.135.43 in topic Eccentricity value

What reference system did GRS80 replace? RJFJR 21:21, 21 September 2007 (UTC)Reply

Geodesy edit

Almost half this article is taken up by a definition/explanation of geodesy and the purpose of a reference ellipsoid. Given that boththese subjects have their own articles, and that this information isn't repeated for every other reference ellipsoid (WGS 84, Bessel 1841, etc), should this really be here? Wardog (talk) 13:47, 10 March 2008 (UTC)Reply

Moving this could be a good idea. OTOH GRS80 is the de-facto standard, so this is actually a good place for this info 93.106.28.105 (talk) 13:25, 31 January 2015 (UTC)Reply
You mean, the other way around: general stuff about any reference ellipsoid should go in reference ellipsoid. Fgnievinski (talk) 13:44, 31 January 2015 (UTC)Reply

Random comment edit

The 1980 Geodetic Reference System (GRS 80) posited a 6 378 137m semi-major axis and a 1/298.257 222 101 flattening. Actually not true: the flattening is not a defining parameter. Instead, the dynamic flattening   and the rate of rotation   are, and the flattening is computed from these (a complex computation, which explains also how WGS84 ended up with different last decimals). 93.106.28.105 (talk) 13:25, 31 January 2015 (UTC)Reply

Eccentricity value edit

The given eccentricity value isn't consistent with the values given for a, b and e². Using the formula or sqrt(e²) I get 0.0818191910428, not 0.0818191910435. --89.204.135.43 (talk) 15:21, 28 June 2019 (UTC)Reply