weacast-leaflet-velocity

This fork is used to publish a custom package for Weacast while waiting for pull requests to be integrated to the upstream.

leaflet-velocity

A plugin for Leaflet (v1.0.3, and v0.7.7) to create a canvas visualisation layer for direction and intensity of arbitrary velocities (e.g. wind, ocean current).

Live Demo: https://danwild.github.io/leaflet-velocity/

• Uses a modified version of WindJS for core functionality.
• Similar to wind-js-leaflet, however much more versatile (provides a generic leaflet layer, and not restricted to wind).
• Data input format is the same as output by wind-js-server, using grib2json.

Example use:

var velocityLayer = L.velocityLayer({
    
    displayValues: true,
    displayOptions: {
        velocityType: 'Global Wind',
        position: 'bottomleft',
        emptyString: 'No velocity data',
        angleConvention: 'bearingCW',
        speedUnit: 'kt'
    },
    data: data,             // see demo/*.json, or wind-js-server for example data service
    
    // OPTIONAL
    minVelocity: 0          // used to align color scale
    maxVelocity: 10         // used to align color scale
    velocityScale: 0.005    // modifier for particle animations, arbitrarily defaults to 0.005
    colorScale: []          // define your own array of hex/rgb colors
});

The angle convention option refers to the convention used to express the wind direction as an angle from north direction in the control. It can be any combination of bearing (angle toward which the flow goes) or meteo (angle from which the flow comes), and CW (angle value increases clock-wise) or CCW (angle value increases counter clock-wise). If not given defaults to bearingCCW.

The speed unit option refers to the unit used to express the wind speed in the control. It can be m/s for meter per second, k/h for kilometer per hour or kt for knots. If not given defaults to m/s.

Reference

leaflet-velocity is possible because of things like:

• L.CanvasOverlay.js
• WindJS
• earth

License

MIT License (MIT)