trajectory

trajectory is a library for lossy compression of trajectory data based on Google's Encoded Polyline Algorithm Format (http://goo.gl/PvXf8Y). It is heavily based on (in fact forked from) https://github.com/hicsail/polyline.

Installation

trajectory can be installed using pip or easy_install

$ pip install trajectory
or
$ easy_install trajectory

API Documentation

Encoding

To serialize a trajectory (set of (lat, lon, unix time in seconds) tuples)

import trajectory
trajectory.encode([
    (38.500, -120.200, 1582482601),
    (40.700, -120.950, 1582482611),
    (43.252, -126.453, 1582482627)
], 5)

This should return _p~iF~ps|U_ynpijgz~G_ulLnnqC_c`|@_mqNvxq`@__t`B.

You can set the required precision with the optional precision parameter. The default value is 5.

Decoding

To deserialize a trajectory (set of (lat, lon, unix time in seconds) tuples) represented by an encoded string

import trajectory
trajectory.decode('_p~iF~ps|U_ynpijgz~G_ulLnnqC_c`|@_mqNvxq`@__t`B', 5)

This should return the following:

[
    (38.500, -120.200, 1582482601),
    (40.700, -120.950, 1582482611),
    (43.252, -126.453, 1582482627)
]

You can set the required precision with the optional precision parameter. The default value is 5.

Development

Setup Dependencies

$ poetry install

Running Tests

$ poetry run pytest

Contributing

Issues and pull requests are welcome.

• For proposing new features/improvements or reporting bugs, create an issue.
• Check open issues for viewing existing ideas, verify if it is already proposed/being worked upon.
• When implementing new features make sure to add relavant tests and documentation before sending pull requests.