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Pure Python geodesy tools

Project description

A pure Python implementation of geodesy tools for various ellipsoidal and spherical earth models using precision trigonometric, vector-based 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 published under the same MIT License.

There are two modules for ellipsoidal earth models, ellipsoidalVincenty 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 and the original JavaScript source or docs.

Also included are modules for conversions to and from UTM (Universal Transverse Mercator) and Web Mercator (Pseudo-Mercator) coordinates, MGRS (NATO Military Grid Reference System) and OSGR (British Ordinance Survery Grid Reference) grid references and a module for encoding and decoding Geohashes.

Two other modules provide Lambert conformal conic projections and positions (from John P. Snyder, Map Projections – A Working Manual, 1987, pp 107-109) and several 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.

All Python source code has been statically checked with PyChecker, PyFlakes, PyCodeStyle (formerly Pep8) and McCabe using Python 2.7.15 and with Flake8 on Python 3.7.0, both in 64-bit on macOS 10.13.5 High Sierra.

The tests have been run in 64-bit with PyPy-Python 2.7.13, Python 2.7.15 (with geographiclib 1.49 and numpy 1.14.0), Intel-Python 3.5.3 (and numpy 1.11.3) and Python 3.7.0, all on macOS 10.13.5 High Sierra and with Pythonista 3.2 Python 2.7.12 and 3.6.1 (both with numpy 1.8.0) on iOS 11.4.

Previously, the tests were run with 64-bit Python 2.6.9 (and numpy 1.6.2), 2.7.10 (and numpy 1.8.0rc1), 2.7.13, 2.7.14 (and numpy 1.13.1), 3.5.3, 3.6.2, 3.6.3, 3.6.4, 3.6.5 on MacOS X 10.10 Yosemite, MacOS X 10.11 El Capitan, macOS 10.12 Sierra and/or macOS 10.13.4 High Sierra, with Pythonista 3.1 on iOS 10.3.3, 11.0.3, 11.1.2 and 11.3, with 32-bit Python 2.6.6 on Windows XP SP3, with 32-bit Python 2.7.14 on Window 10 Pro and with 64-bit Python 3.7.0 on Debian GNU/Linux 9.

In addition to the PyGeodesy package, the distribution files contain the tests, the test results and the complete documentation generated by Epydoc using command line: epydoc --html --no-private --no-source --name=PyGeodesy --url=... -v pygeodesy.

To install PyGeodesy, type pip install PyGeodesy or easy_install PyGeodesy in a terminal or command window. Alternatively, download PyGeodesy- from PyPI or GitHub, unzip the downloaded file, cd to directory PyGeodesy- and type python setup.py install. To run all PyGeodesy tests, type python setup.py test before installation.

Installation of NumPy and GeographicLib is optional, but the latter is required for two ellipsoidalVincenty functions, areaOf and perimeterOf.

Some function and method names differ from the JavaScript version. In such cases documentation tag JS name: shows the original JavaScript name.

Last updated: July 17, 2018.

Copyright (C) 2016-2018 -- mrJean1 at Gmail dot com

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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