Leaflet TimeDimension

Add time dimension capabilities on a Leaflet map.

Examples

Checkout the Leaflet TimeDimension Demos. Basic example:

var map = L.map('map', {
    zoom: 10,
    center: [38.705, 1.15],
    timeDimension: true,
    timeDimensionOptions: {
        timeInterval: "2014-09-30/2014-10-30",
        period: "PT1H"
    },
    timeDimensionControl: true,
});

var testWMS = "http://thredds.socib.es/thredds/wms/observational/hf_radar/hf_radar_ibiza-scb_codarssproc001_aggregation/dep0001_hf-radar-ibiza_scb-codarssproc001_L1_agg.nc"
var testLayer = L.nonTiledLayer.wms(testWMS, {
    layers: 'sea_water_velocity',
    format: 'image/png',
    transparent: true,
    styles: 'prettyvec/rainbow',
    markerscale: 15,
    markerspacing: 20,
    abovemaxcolor: "extend",
    belowmincolor: "extend",
    colorscalerange: "0,0.4",
    attribution: 'SOCIB HF RADAR | sea_water_velocity'
});
var testTimeLayer = L.timeDimension.layer.wms(testLayer);
testTimeLayer.addTo(map);

For more control over each object creation, you can create timeDimension objects manually, see Example 9

API

L.Map

This plugin will attach to a Map a TimeDimension object and a related TimeDimension Control if timeDimension and timeDimensionControl options are included.

Option	Description
timeDimension	Creates a new TimeDimension object linked to the map.
timeDimensionOptions	Options for the TimeDimension object.
timeDimensionControl	Adds a TimeDimension Control to the map.
timeDimensionControlOptions	Options for the TimeDimension Control object.

L.TimeDimension

TimeDimension object manages the time component of a layer. It can be shared among different layers and it can be added to a map, and become the default timedimension component for any layer added to the map.

In order to include a TimeDimension in the map, add timeDimension: true as an option when creating the map.

Options

This options can be set up when creating the map with the option timeDimensionOptions.

Option	Default	Description
times	null	It can be: a) An array of times (in milliseconds). b) String of dates separated by commas. c) String formed by start date/end date/period. If null, it will be constructed according to timeInterval and period
timeInterval	"P1M/" + today	String to construct the first available time and the last available time. Format: ISO8601 Time inverval
period	"P1D"	Used to construct the array of available times starting from the first available time. Format: ISO8601 Duration
validTimeRange	undefined	Filter the array of available times by start hour and end hour (for any date). Format "HH:MM/HH:MM"
currentTime	Closest available time	Current time to be loaded. Time in ms.
loadingTimeout	3000	Maximum time in milliseconds that the component will wait to apply a new time if synced layers are not ready

Events

Event	Data	Description
timeloading	time	Fired when a new time is required to load
timeload	time	Fired when a all synced layers have been loaded/prepared for a new time (or timeout)
availabletimeschanged	-	Fired when the list of available times have been updated
limitschanged	lowerLimit, upperLimit	Fired when range limits changed. Limits are expressed in index value

Methods

Method	Returns	Description
getAvailableTimes()	Array of times	Array of all the available times of the TimeDimension
getCurrentTime()	time	Current time of the Time Dimension
setCurrentTime(time)	-	Modify the current time. If the time argument is not among the available times, the previous closest time will be selected
nextTime(numSteps)	-	Move the current time n steps forward in the available times array
previousTime(numSteps)	-	Move the current time n steps backward in the available times array
prepareNextTimes(numSteps, howmany)	-	Fire 'timeloading' for severals times (in order to pre-load layers)
registerSyncedLayer(L.TimeDimension.Layer layer)	-	TimeDimension will check if all layers are ready before firing timeload. It will listen to "timeload" event of these layers.
unregisterSyncedLayer(L.TimeDimension.Layer layer)	-
setAvailableTimes(times, mode)	-	Update available times of the TimeDimension with a new array of times (in ms). Mode : Update modes

L.TimeDimension.Layer

TimeDimension.Layer is an abstract Layer that can be managed/synchronized with a TimeDimension. The constructor recieves a layer (of any kind) and options.

Any children class should implement _onNewTimeLoading, isReady and _update functions to react to time changes.

Options

Option	Default	Description
timeDimension	null	TimeDimension object which will manage this layer. If it is not defined, the map TimeDimension will be attached when adding this layer to the map.

Events

Event	Data	Description
timeload	time	Fires when a the layer has been loaded/prepared for a new time

L.TimeDimension.Layer.WMS

Implements a TimeDimension Layer for a given WMS layer, which can be a L.TileLayer.WMS or a L.NonTiledLayer.WMS.

This component synchronizes the WMS with a TimeDimension, modifying the time parameter in the WMS requests.

Options

Option	Default	Description
timeDimension	null
cache	0
cacheBackward	`cache
cacheForward	`cache
updateTimeDimension	false	Update the list of available times of the attached TimeDimension with the available times obtained by getCapabilities
updateTimeDimensionMode	intersect	Operation to merge the available times of the TimeDimension and the layer (intersect, union, replace or extremes). See Update modes
requestTimeFromCapabilities	`false
proxy	null	URL of the proxy used to obtain getCapabilities responses from the WMS server avoiding cross site origin problems
getCapabilitiesParams	{}	Extra parameters needed to create getCapabilities request
setDefaultTime	false	If true, it will change the current time to the default time of the layer (according to getCapabilities)
wmsVersion	`"1.1.1"

L.TimeDimension.Layer.GeoJSON

Manages a GeoJSON layer with a TimeDimension. According to GeoJSON specification, geometry coordinates can have only three dimensions: latitude, longitude and elevation. There isn't a standard way to add time dimension information. This plugin will search for some attributes inside properties:

• coordTimes, times or linestringTimestamps: array of times that can be associated with a geometry (datestrings or ms). In the case of a LineString, it must have as many items as coordinates in the LineString. (Note: coordTimes is the name of the property recently included at Mapbox toGeoJSON library)
• time: time of the feature

This component will create and show new GeoJSON layers which include only those features (or part of them) that are active for the time of the TimeDimension (according to a duration option). These new layers will inherit the baseLayer options. In the case of LineStrings, if addlastPoint option is enabled, a Point feature will be added with the property last (that can be used to customize the marker of this special Point).

Options

Option	Default	Description
timeDimension	null
duration	null	Period of time which the features will be shown on the map after their time has passed. If null, all previous times will be shown. Format: ISO8601 Duration
addlastPoint	false	Add a Point at the last valid coordinate of a LineString.
waitForReady	false	If true, it will wait until the baseLayer is loaded to mark itself as ready. You can use it with layers created using leaflet-omnivore.
updateTimeDimension	false	Update the list of available times of the attached TimeDimension with the available times of this GeoJSON
updateTimeDimensionMode	extremes	Operation to merge the available times of the TimeDimension and the layer (intersect, union, replace or extremes)

L.Control.TimeDimension

Leaflet control to manage a timeDimension. With play|pause, next, back, current time, time slider and speed slider controls.

Options

Option	Default	Description
timeDimension	null
backwardButton	true	Show backward button
forwardButton	true	Show forward button
playButton	true	Show play/pause button
loopButton	false	Show loop button to enable/disable loop animation
displayDate	true	Show display date control
timeSlider	true	Show time slider control
timeSliderDragUpdate	false	Update the map when dragging
speedSlider	true	Show speed slider control
minSpeed	0.1	Minimum selectable value for speed slider in fps (1000/transitionTime)
maxSpeed	10	Maximum selectable value for speed slider in fps
speedStep	0.1	Speed slider step size
limitSliders	false	Show limit knobs on the time slider to restrict animation range
limitMinimumRange	5	The minimum number of steps allowed in animation range
timeSteps	1	Number of time steps applied to the TimeDimension (forwards or backwards) in a time change
autoPlay	false	Animate the map automatically
player	-	Attach an existing player to that control
playerOptions	-	Options for the TimeDimension Player object attached.(Cannot be used with player option)

L.TimeDimension.Player

Component to animate a map with a TimeDimension, changing the time periodically.

Options

Option	Default	Description
timeDimension	null
transitionTime	1000	Milliseconds that the player will wait to check and launch the next time in the TimeDimension
buffer	5	(Number or Function) Number of times forward that will be requested in each iteration. Function callback will be called with 3 parameters (transitionTime, minBufferReady, loop)
minBufferReady	1	If this option is greater than 0, the player will full the buffer every time the number of next ready times (next layers ready) is below this number.
loop	false	Loop the animation when it reaches the last available time
startOver	false	When the player is at the last position, it start over to the beginning when the user press play

Methods

Method	Returns	Description
start()	-	Start animation
stop()	-	Stop active animation
getTransitionTime()	<int>	Return the time interval between two animation steps (in milliseconds)
setTransitionTime(interval)	-	Change the time interval between two animation steps
isLooped()	<boolean>	Return the loop state
setLooped(boolean)	-	Activate/Desactivate the loop state

Events

List of events triggered by the player. Register with .on()

Event	Data	Description
play	-	When the animation is started/unpaused
running	-	When the animation is resuming after a waiting state
stop	-	When the animation is stopped/paused
waiting	available, buffer	When the animation is waiting for some layers to be loaded
animationfinished	-	When the animation has reached the end of the timeline (loop is disabled)
loopchange	loop	When the loop setting is changed
speedchange	transitionTime, buffer	When the transitionTime setting is changed

TimeDimension update modes

Update mode can be one of these values: intersect, union, replace, extremes.

• replace It replaces available times with only the new ones (from layer or setAvailableTimes).
• union It adds new times and merge them to existing ones.
• intersect It keeps only the time shared in both existing and new ones.
• extremes It can recompute periodic times according to options.period and extreme values of the set.

Requisites

• jquery
• iso8601-js-period
• For the TimeDimension Control:
  • glyphicons

Bugs, issues and contributions

Contributions and criticisms are welcome.

If you have any doubt or problem, please fill an issue!

If you fix something or want to add some contribution, many thanks in advance!