/galton

Lightweight Node.js isochrone map server
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README.md

Galton

npm version Build Status npm downloads

Lightweight Node.js isochrone server. Build isochrones using OSRM, Turf and concaveman.

Francis Galton is the author of the first known isochrone map.

Screenshot

Installation

Galton depends on node version 4.

npm install -g galton

...or build from source

git clone https://github.com/urbica/galton.git
cd galton
npm install
npm run build

Usage

Usage: galton [filename] [options]

where [filename] is path to OSRM data and [options] is any of:
  --bufferSize - buffer size (default: 6)
  --cellWidth - turf-point-grid distance across each cell (default: 0.2)
  --concavity - concaveman relative measure of concavity (default: 2)
  --intervals - isochrones intervals in minutes (default: 5 10 15 20 25 30)
  --lengthThreshold - concaveman length threshold (default: 0)
  --pid - save PID to file
  --port - port to run on (default: 4000)
  --resolution - turf-bezier time in milliseconds between points (default: 10000)
  --sharedMemory - use shared memory (default: false)
  --sharpness - turf-bezier measure of how curvy the path should be between splines (default: 0.85)
  --socket - use Unix socket instead of port
  --units - either `kilometers` or `miles` (default: kilometers)
  --version - returns running version then exits
galton moscow_russia.osrm

Open examples/index.html?access_token=<token>

Examples

Build isochrones from point

curl http://localhost:4000 --get --data 'lng=37.62&lat=55.75'

Build isochrones for 10, 20 and 30 minute intervals

curl http://localhost:4000 --get --data 'lng=37.62&lat=55.75&intervals[]=10&intervals[]=20&&intervals[]=30'

See the example, API and test/index.js for more info.

Using with Docker

docker run -d -p 4000:4000 urbica/galton <url> <profile>

Where url is osm.pbf url and profile is one of the default OSRM profiles (foot is default).

Examples:

This will create docker container with last version of galton using osrm with mapzen extract processed with default car profile

docker run -d -p 4000:4000 urbica/galton "https://s3.amazonaws.com/metro-extracts.mapzen.com/moscow_russia.osm.pbf" car
curl http://localhost:4000 --get --data 'lng=37.62&lat=55.75'

You can also set sysctl options for container with --sysctl

docker run \
  -d \
  -p 4000:4000 \
  --sysctl "kernel.shmmax=18446744073709551615"
  urbica/galton "https://s3.amazonaws.com/metro-extracts.mapzen.com/moscow_russia.osm.pbf" car