Galton

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

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

Installation

npm install -g galton

...or build from source

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

Usage

Usage: galton [filename] [options]

where [filename] is path to OSRM data and [options] is any of:
  --radius - distance to draw the buffer (default: 6)
  --cellSize - the distance across each cell (default: 0.2)
  --concavity - concaveman relative measure of concavity (default: 2)
  --deintersect - whether or not to deintersect the final isochrones (default: true)
  --intervals - isochrones intervals in minutes (default: 10 20 30)
  --lengthThreshold - concaveman length threshold (default: 0)
  --pid - save PID to file
  --port - port to run on (default: 4000)
  --sharedMemory - use shared memory (default: false)
  --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>

Example

cd galton
wget https://s3.amazonaws.com/metro-extracts.mapzen.com/moscow_russia.osm.pbf
./node_modules/osrm/lib/binding/osrm-extract -p ./node_modules/osrm/profiles/car.lua moscow_russia.osm.pbf
./node_modules/osrm/lib/binding/osrm-contract moscow_russia.osrm
npm start -- moscow_russia.osrm

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 try setting 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