ZeitPunkt [ˈʦaɪ̯tˌpʊŋkt]

Tools to work with GeoJSON LineStrings with given time components.

GeoJSON Format

A standard LineString is used to represent the coordinates. Besides that, the time for each point is stored in a time array as property of the GeoJSON Feature.

A minimal GeoJSON instance looks like this:

{
  "type": "Feature",
  "geometry": {
    "type": "LineString",  // or: "MultiPoint"
    "coordinates": [       // array of [lng,lat] coordinates
      [ 10.0304153141,      48.4343540454     ],
      [ 10.030424406259081, 48.43435113062047 ],
      ...
    ]
  },
  "properties": {
    "time": [              // array of timestamps
      1433907300000,
      1433907300088,
      ...
    ]
  }
}

Usage

var zeitpunkt = require('zeitpunkt')

fs.createReadStream('data.csv')
  .pipe(zeitpunkt.csv()) // read in CSV
  .on('data', function(geojson) {
    // remove invalid points
    geojson = zeitpunkt.clean({
      lat: [30,40] // only points with latitude between 30 and 40
    }, geojson)

    // simplify the given linestring
    geojson = zeitpunkt.simplify({
      tolerance: 0.01
    }, geojson)

    // split at 500 points
    geojson = zeitpunkt.split({
      points: 500
    }, geojson)

    console.log(geojson)
  })

Command Line

zeitpunkt provides a command line tool to work with GeoJSON linestrings with time components. You can easily use the zeitpunkt executable after installing it as global module:

npm install -g zeitpunkt

It consumes geo data from stdin and prints the result to stdout. Call zeitpunkt --help to get a list of all options.

Compatible Tools

A short list of tools that produce or consume GeoJSON linestrings with time components:

• LeafletPlayback: Interactive display of GeoJSON multipoints with time components
• transportation: Generates vehicles' positions as GeoJSON linestrings by GTFS public transportation data
• timetraveller: Interactive display of GeoJSON linestrings with time components
• timetraveller-mongodb: Store GeoJSON linestrings with time components in MongoDB
• csv2geojson: Convert CSV files to GeoJSON files
• ObsJSON: GeoJSON based observations/data-centric minimal schema

Please open an issue to add more compatible tools.