As of version 2, leaflet-velocity is now under CSIRO's Open Source Software Licence Agreement, which is variation of the BSD / MIT License.

There are no other plans for changes to licensing, and the project will remain open source.

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://onaci.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.

Screenshot

var velocityLayer = L.velocityLayer({
 displayValues: true,
 displayOptions: {
 // label prefix
 velocityType: "Global Wind",
 // leaflet control position
 position: "bottomleft",
 // no data at cursor
 emptyString: "No velocity data",
 // see explanation below
 angleConvention: "bearingCW",
 // display cardinal direction alongside degrees
 showCardinal: false,
 // one of: ['ms', 'k/h', 'mph', 'kt']
 speedUnit: "ms",
 // direction label prefix
 directionString: "Direction",
 // speed label prefix
 speedString: "Speed",
 },
 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
 onAdd: null, // callback function
 onRemove: null, // callback function
 opacity: 0.97, // layer opacity, default 0.97
 // optional pane to add the layer, will be created if doesn't exist
 // leaflet v1+ only (falls back to overlayPane for < v1)
 paneName: "overlayPane",
});

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.

npm run watch

leaflet-velocity is possible because of things like:

• L.CanvasOverlay.js
• WindJS
• earth

Data shown for the Great Barrier Reef has been derived from CSIRO's eReefs products

CSIRO Open Source Software Licence Agreement (variation of the BSD / MIT License)