SampledProperty

new Cesium.SampledProperty(type, derivativeTypes)
DataSources/SampledProperty.js 168

A Property whose value is interpolated for a given time from the provided set of samples and specified interpolation algorithm and degree.
Name Type Description
type Number | Packable The type of property.
derivativeTypes Array.<Packable> optional When supplied, indicates that samples will contain derivative information of the specified types.
Examples:
//Create a linearly interpolated Cartesian2
var property = new Cesium.SampledProperty(Cesium.Cartesian2);

//Populate it with data
property.addSample(Cesium.JulianDate.fromIso8601(`2012-08-01T00:00:00.00Z`), new Cesium.Cartesian2(0, 0));
property.addSample(Cesium.JulianDate.fromIso8601(`2012-08-02T00:00:00.00Z`), new Cesium.Cartesian2(4, 7));

//Retrieve an interpolated value
var result = property.getValue(Cesium.JulianDate.fromIso8601(`2012-08-01T12:00:00.00Z`));
//Create a simple numeric SampledProperty that uses third degree Hermite Polynomial Approximation
var property = new Cesium.SampledProperty(Number);
property.setInterpolationOptions({
    interpolationDegree : 3,
    interpolationAlgorithm : Cesium.HermitePolynomialApproximation
});

//Populate it with data
property.addSample(Cesium.JulianDate.fromIso8601(`2012-08-01T00:00:00.00Z`), 1.0);
property.addSample(Cesium.JulianDate.fromIso8601(`2012-08-01T00:01:00.00Z`), 6.0);
property.addSample(Cesium.JulianDate.fromIso8601(`2012-08-01T00:02:00.00Z`), 12.0);
property.addSample(Cesium.JulianDate.fromIso8601(`2012-08-01T00:03:30.00Z`), 5.0);
property.addSample(Cesium.JulianDate.fromIso8601(`2012-08-01T00:06:30.00Z`), 2.0);

//Samples can be added in any order.
property.addSample(Cesium.JulianDate.fromIso8601(`2012-08-01T00:00:30.00Z`), 6.2);

//Retrieve an interpolated value
var result = property.getValue(Cesium.JulianDate.fromIso8601(`2012-08-01T00:02:34.00Z`));
See:

Members

backwardExtrapolationDuration : Number
DataSources/SampledProperty.js 354

Gets or sets the amount of time to extrapolate backward before the property becomes undefined. A value of 0 will extrapolate forever.
Default Value: 0

backwardExtrapolationType : ExtrapolationType
DataSources/SampledProperty.js 336

Gets or sets the type of extrapolation to perform when a value is requested at a time before any available samples.
Default Value: ExtrapolationType.NONE

readonlydefinitionChanged : Event
DataSources/SampledProperty.js 246

Gets the event that is raised whenever the definition of this property changes. The definition is considered to have changed if a call to getValue would return a different result for the same time.

derivativeTypes : Array.<Packable>
DataSources/SampledProperty.js 266

Gets the derivative types used by this property.

forwardExtrapolationDuration : Number
DataSources/SampledProperty.js 318

Gets or sets the amount of time to extrapolate forward before the property becomes undefined. A value of 0 will extrapolate forever.
Default Value: 0

forwardExtrapolationType : ExtrapolationType
DataSources/SampledProperty.js 300

Gets or sets the type of extrapolation to perform when a value is requested at a time after any available samples.
Default Value: ExtrapolationType.NONE

interpolationAlgorithm : InterpolationAlgorithm
DataSources/SampledProperty.js 288

Gets the interpolation algorithm to use when retrieving a value.
Default Value: LinearApproximation

interpolationDegree : Number
DataSources/SampledProperty.js 277

Gets the degree of interpolation to perform when retrieving a value.
Default Value: 1

readonlyisConstant : Boolean
DataSources/SampledProperty.js 232

Gets a value indicating if this property is constant. A property is considered constant if getValue always returns the same result for the current definition.

type : Object
DataSources/SampledProperty.js 256

Gets the type of property.

Methods

addSample(time, value, derivatives)
DataSources/SampledProperty.js 543

Adds a new sample
Name Type Description
time JulianDate The sample time.
value Packable The value at the provided time.
derivatives Array.<Packable> optional The array of derivatives at the provided time.

addSamples(times, values, derivativeValues)
DataSources/SampledProperty.js 585

Adds an array of samples
Name Type Description
times Array.<JulianDate> An array of JulianDate instances where each index is a sample time.
values Array.<Packable> The array of values, where each value corresponds to the provided times index.
derivativeValues Array.<Array> optional An array where each item is the array of derivatives at the equivalent time index.
Throws:

addSamplesPackedArray(packedSamples, epoch)
DataSources/SampledProperty.js 631

Adds samples as a single packed array where each new sample is represented as a date, followed by the packed representation of the corresponding value and derivatives.
Name Type Description
packedSamples Array.<Number> The array of packed samples.
epoch JulianDate optional If any of the dates in packedSamples are numbers, they are considered an offset from this epoch, in seconds.

equals(other) → Boolean
DataSources/SampledProperty.js 650

Compares this property to the provided property and returns true if they are equal, false otherwise.
Name Type Description
other Property optional The other property.
Returns:
true if left and right are equal, false otherwise.

getValue(time, result) → Object
DataSources/SampledProperty.js 374

Gets the value of the property at the provided time.
Name Type Description
time JulianDate The time for which to retrieve the value.
result Object optional The object to store the value into, if omitted, a new instance is created and returned.
Returns:
The modified result parameter or a new instance if the result parameter was not supplied.

setInterpolationOptions(options)
DataSources/SampledProperty.js 508

Sets the algorithm and degree to use when interpolating a value.
Name Type Description
options Object optional Object with the following properties:
Name Type Description
interpolationAlgorithm InterpolationAlgorithm optional The new interpolation algorithm. If undefined, the existing property will be unchanged.
interpolationDegree Number optional The new interpolation degree. If undefined, the existing property will be unchanged.