This calculator uses Vincenty’s formula
, which is extremely accurate and precise on the WGS-84 Geoid (typically to within 0.5mm, or 0.000015"). However, since the Earth is quite bumpy we really don't need that sort of precision in normal practice. This calculator rounds off to practical precisions, depending on the distance involved. You can safely state the precision to be within half of the last significant place. Flexible formats are accepted:
deg°min'sec with N/S/E/W suffixes (e.g. 24°52'33.5100S, 152°21'8.2728E)
deg min sec with N/S/E/W suffixes (e.g. 24 52 33.5100S, 152 21 8.2728E)
deg-min-sec with N/S/E/W suffixes (e.g. 24-52-33.5100S, 152-21-8.2728E). Pretty much any non-numeric seperator character can be used.
signed decimal degrees, where negative indicates west and south (e.g. 152.352298, -24.875975)
In writing this web page extensive use has been made of Chris Veness' Sperical
The following statement is made on Chris' web page. I endorse Chris' sentiments.
I offer these formulæ & scripts for free use and adaptation as my contribution to the open-source info-sphere from which I have received so much. You are welcome to re-use these scripts [under a simple attribution license, without any warranty express or implied] provided solely that you retain my copyright notice and a link to this page.
Copyright (c) Mike Turnbull 2010. Last updated on 26 November 2017 @ 18:50 UTC.