![]() tan ( phip ) tan_phip2 = tan_phip ** 2 nu3, nu5 = nu ** 3, nu ** 5 sec_phip = 1. format ( d = abs ( d ), m = m, s = s, hemi = hemi, ndp = ndp ) def deg_to_dms ( deg, pretty_print_latlong = None, ndp = 4 ): """Convert from decimal degrees to degrees, minutes, seconds.""" m, s = divmod ( abs ( deg ) * 3600, 60 ) d, m = divmod ( m, 60 ) if deg = 1.e-5 : phip = ( N - N0 - M ) / ( a * F0 ) + phip M = fM ( phip, a, b ) rho, nu, eta2 = get_prms ( phip, a, F0, e2 ) tan_phip = math. The square of the ellipsoid's eccentricity constant, $e^2 = \frac '. These parameters apply to the Airy 1830 ellipsoid associated with the OSGB36 datum and the coordinates and conventions of the transverse Mercator projection used on OS maps. ![]() In particular, it will not to convert between grid references and longitude/latitude coordinates within the global WGS84 datum used by most GPS devices). ![]() It is not a coordinate transformation, and so cannot be used to transform OS map grid references to other datums. ![]() The topic of geodesy is a complex and interesting one and the interested reader is referred to this document for more information.Ī short warning: the following algorithm converted between grid references and longitude/latitude coordinates within the same datum only (for the parameters given here, the OSGB36 on the Airy 1830 ellipsoid, a good local fit to the island of Great Britain). Its maps refer to locations using a grid of easting and northing coordinates $(E, N)$ (the British National Grid) instead of a graticule of longitude and latitude, but there is an algorithm for converting between the two, detailed below and in more detail in the OS publication A Guide to Coordinate Systems in Great Britain. The UK Ordnance Survey is the national mapping agency for Great Britain. ![]()
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