Skip to main content
This is a pre-production deployment of Warehouse. Changes made here affect the production instance of PyPI (
Help us improve Python packaging - Donate today!

Simplify geometries with the Visvalingam-Wyatt algorithm

Project Description

A Python implementation of the Visvalingam-Wyatt line simplification algorithm.

This implementation is due to Eliot Hallmark. This release simply packages it as a Python module.


>>> import visvalingamwyatt as vw
>>> points = [(1, 2), (2, 3), (3, 4), ...]
>>> vw.simplify(points)
[(1, 2), (3, 4), ...]

Points may be any Sequence-like object that (list, tuple, a custom class that exposes an __iter__ method).

Test different methods and thresholds:

simplifier = vw.Simplifier(points)

# Simplify by percentage of points to keep

# Simplify by giving number of points to keep

# Simplify by giving an area threshold

Shorthands for working with geodata:

import visvalingamwyatt as vw

feature = {
    "properties": {"foo": "bar"},
    "geometry": {
        "type": "Polygon",
        "coordinates": [...]

# returns a copy of the geometry, simplified (keeping 90% of points)
vw.simplify_geometry(feature['geometry'], ratio=0.90)

# returns a copy of the feature, simplified (using an area threshold)
vw.simplify_feature(feature, threshold=0.90)

The command line tool vwsimplify is available to simplify GeoJSON files:

# Simplify using a ratio of points
vwsimplify --ratio 0.90 in.geojson -o simple.geojson

# Simplify using the number of points to keep
vwsimplify --number 1000 in.geojson -o simple.geojson

# Simplify using a minimum area
vwsimplify --threshold 0.001 in.geojson -o simple.geojson

Install Fiona for the additional ability to simplify any geodata layer.



Release History

This version
History Node


History Node


History Node


Download Files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Filename, Size & Hash SHA256 Hash Help File Type Python Version Upload Date
(16.5 kB) Copy SHA256 Hash SHA256
Wheel py2.py3 Dec 3, 2017
(7.8 kB) Copy SHA256 Hash SHA256
Source None Dec 3, 2017

Supported By

Elastic Elastic Search Pingdom Pingdom Monitoring Dyn Dyn DNS Sentry Sentry Error Logging CloudAMQP CloudAMQP RabbitMQ Heroku Heroku PaaS Kabu Creative Kabu Creative UX & Design Fastly Fastly CDN DigiCert DigiCert EV Certificate Google Google Cloud Servers