🇬🇧 BNG ⇄ LatLon🌐

Converts british national grid eastings and northings (OSBG36) to latitude and longitude (WGS84) and vice versa as used by https://blocl.uk

Originally authored by Hannah Fry.

NEW! importable, installable, PEP8 styled, pure python, doctested, with optional numba compiler support for 10x speed

Documentation

Package includes:

• bng_to_latlon.py originally published as "Converting British National Grid to Latitude and Longitude II"
• latlon_to_bng.py originally "Converting Latitude and Longitude to British National grid"

The mathematical theory used here is set out in "A guide to coordinate systems in Great Britain" by Ordnance Survey.

Installation

Get the latest stable release from PyPi:

pip install bng_latlon

optional but recommend is numba compiler

pip install numba

Usage

>>> from bng_latlon import OSGB36toWGS84
>>> OSGB36toWGS84(538890, 177320)
(51.477795, -0.001402)
...
>>> from bng_latlon import WGS84toOSGB36
>>> WGS84toOSGB36(51.4778, -0.0014)
(538890.1053, 177320.4965)

MIT licensed. Designed in the UK, published from Slovakia. Blocl Schools.