Fast lon, lat to BNG conversion
Project description
This module provides two fast methods:
util.convertbng(lons, lats) – pass sequences (such as lists or numpy arrays) of Longitudes and Latitudes, or single values of each. Returns a list of two lists containing Easting and Northing floats, respectively.
util.convertlonlat(eastings, northings) – pass sequences (such as lists or numpy arrays) of Eastings, Northings, or single values of each. Returns a list of two lists containing Longitude and Latitude floats, respectively
And four accurate OSTN02-enabled methods, suitable for surveying and other geodetic work:
convert_osgb36(lons, lats) – convert ETRS89 Longitudes and Latitudes to OSGB36
convert_osgb36_to_lonlat(eastings, northings) – convert OSGB36 Eastings and Northings to ETRS89 longitudes and latitudes
convert_etrs89_to_osgb36(eastings, northings) – convert ETRS89 Eastings and Northings to OSGB36 Eastings and Northings
convert_osgb36_to_etrs89(eastings, northings) – convert OSGB36 eastings and Northings to ETRS89 Eastings and Northings.
All four methods accept and return floating-point numbers.
Latitude:
East: 1.768960 (Max)
West: -6.379880 (Min)
Longitude:
North: 55.811741 (Max)
South: 49.871159 (Min)
Installation
Installation as a binary wheel using pip, for OS X:
pip install convertbng
Binary wheels aren’t yet available for Linux or Windows, but installation directly from Github works:
pip install git+git://github.com/urschrei/convertbng.git
Usage
from convertbng.util import convertbng, convertlonlat
# convert a single value
res = convertbng(lon, lat)
# convert lists of longitude and latitude values to BNG Eastings and Northings
lons = [lon1, lon2, lon3]
lats = [lat1, lat2, lat3]
res_list = convertbng(lons, lats)
# convert lists of BNG Eastings and Northings to longitude, latitude
eastings = [easting1, easting2, easting3]
northings = [northing1, northing2, northing3]
res_list_en = convertlonlat(eastings, northings)
# assumes numpy imported as np
lons_np = np.array(lons)
lats_np = np.array(lats)
res_list_np = convertbng(lons_np, lats_np)
Testing
Run nosetests (requires Nose)
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