A pure Python implementation of geodesy tools for various ellipsoidal and spherical earth models using precision trigonometric, vector-based, elliptic and approximate methods for geodetic (lat-/longitude) and geocentric cartesian (x/y/z) coordinates.
Transcribed from JavaScript originals by Chris Veness (C) 2005-2016 and several C++ classes by Charles Karney (C) 2008-2017 and published under the same MIT License.
There are three modules for ellipsoidal earth models, ellipsoidalKarney, -Vincenty and -Nvector and two for spherical ones, sphericalTrigonometry and -Nvector. Each module provides a LatLon class with methods and functions to compute distance, initial and final bearing, intermediate and nearest points, area, perimeter, conversions and unrolling, among other things. For more information and further details see the documentation, the descriptions of Latitude/Longitude, Vincenty and Vector-based geodesy, the original JavaScript source or docs and the Python GeographicLib.
Also included are modules for conversions to and from Cassini-Soldner, UPS (Universal Polar Stereographic), UTM (Exact and Universal Transverse Mercator) and Web Mercator (Pseudo-Mercator) coordinates, MGRS (NATO Military Grid Reference System) and OSGR (British Ordinance Survery Grid Reference) grid references, TRF (Terrestrial Reference Frames) and modules to encode and decode EPSG, Geohashes, Georefs (WGRS) and Garefs (GARS) .
Other modules provide Lambert conformal conic projections and positions (from John P. Snyder, Map Projections -- A Working Manual, 1987, pp 107-109), functions to clip a path or polygon of LatLon points using the Cohen-Sutherland and the Sutherland-Hodgman methods, functions to simplify or linearize a path of LatLon points (or a NumPy array), including implementations of the Ramer-Douglas-Peucker, the Visvalingam-Whyatt and the Reumann-Witkam algorithms and modified versions of the former. Other classes interpolate the height of LatLon points and several Geoid models or compute various Fréchet or Hausdorff distances.
To install PyGeodesy, type pip install PyGeodesy
or easy_install
PyGeodesy
in a terminal or command window. Alternatively, download
PyGeodesy-yy.m.d.zip
from PyPI or GitHub, unzip
the downloaded
file, cd
to directory PyGeodesy-yy.m.d
and type python setup.py
install
. To run all PyGeodesy tests, type python setup.py test
before installation.
Installation of GeographicLib, NumPy and SciPy is optional. However, the former is required for classes CassiniSoldner and Css and function toCss, for module ellipsoidalKarney classes LatLon and Cartesian and functions areaOf and perimeterOf and for the HeightIDWkarney interpolator. The latter are needed for the Geoid... and Height... interpolator classes, except the GeoidKarney and all HeightIDW... classes.
In addition to the pygeodesy
package, the PyGeodesy distribution
files contain the tests, the test results (on macOS only) and the
complete documentation generated by Epydoc using command line:
epydoc --html --no-private --no-source --name=PyGeodesy --url=... -v
pygeodesy
.
The tests have been run with Python 2.7.16 and 3.7.4 (both with geographiclib 1.49, numpy 1.16.4 and scipy 1.2.2 respectively 1.3.0) and with PyPy 6.0.0 (Python 2.7.13 and 3.5.3) on macOS 10.13.6 High Sierra, all in 64-bit only. The results of those tests are included in the distribution files.
The tests also run with Python 2.7.14, 3.5.6 and 3.6.3 (and geographiclib 1.49) on Ubuntu 14.04 and with Python 3.7.3 (and geographiclib 1.49) on Debian 9 all in 64-bit only and with Python 2.7.15, 3.6.8 and 3.7.2 (all with geographiclib 1.49) on Windows Server 2012R2 in both 32- and 64-bit.
With Python 3.7+, the tests run with and without lazy import.
A single-File and single-Directory application with pygeodesy
has
been bundled using PyInstaller 3.4 and 64-bit Python 3.7.3 and 3.7.4
on macOS 10.13.6 High Sierra.
Previously, the tests were run with Python 2.6.9 (and numpy 1.6.2), 2.7.10 (and numpy 1.8.0rc1), 2.7.13, 2.7.14, 2.7.15 (and numpy 1.13.1, 1.14.0, 1.15.2 or 1.16.2), 3.5.3, 3.6.2, 3.6.3, 3.6.4, 3.6.5, 3.7.0, 3.7.2, 3.7.3 and Intel-Python 3.5.3 (and numpy 1.11.3) on MacOS X 10.10 Yosemite, MacOS X 10.11 El Capitan, macOS 10.12 Sierra, macOS 10.13.5 High Sierra and macOS 10.14 Mojave, with Pythonista 3.1 on iOS 10.3.3, 11.0.3, 11.1.2 and 11.3 on iPad4, with Pythonista 3.2 (with geographiclib 1.49 and numpy 1.8.0) on iOS 11.4.1, 12.0, 12.2 and 12.3 on iPad4, iPhone6 and/or iPhone10, all in 64-bit only and with 32-bit Python 2.6.6 on Windows XP SP3 and with 32-bit Python 2.7.14 on Windows 10 Pro.
All Python source code has been statically checked with PyChecker, PyFlakes, PyCodeStyle (formerly Pep8) and McCabe using Python 2.7.16 and with Flake8 using Python 3.7.4, both in 64-bit on macOS 10.13.6 High Sierra.
Some function and method names differ from the JavaScript version. In such cases documentation tag JS name: shows the original JavaScript name.
Last updated: Oct 02, 2019.
Copyright (C) 2016-2020 -- mrJean1 at Gmail -- All Rights Reserved.
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