Ellipsoid
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new Cesium.Ellipsoid(x, y, z)
engine/Source/Core/Ellipsoid.js 76

A quadratic surface defined in Cartesian coordinates by the equation (x / a)^2 + (y / b)^2 + (z / c)^2 = 1. Primarily used by Cesium to represent the shape of planetary bodies. Rather than constructing this object directly, one of the provided constants is normally used.
参数名称 类型 默认值 描述信息
x number 0 可选 The radius in the x direction.
y number 0 可选 The radius in the y direction.
z number 0 可选 The radius in the z direction.
Throws:
  • DeveloperError : All radii components must be greater than or equal to zero.
参考:

成员(属性)

static constant Cesium.Ellipsoid.MOON : Ellipsoid
engine/Source/Core/Ellipsoid.js 250

An Ellipsoid instance initialized to a sphere with the lunar radius.

static Cesium.Ellipsoid.packedLength : number
engine/Source/Core/Ellipsoid.js 273

The number of elements used to pack the object into an array.

static constant Cesium.Ellipsoid.UNIT_SPHERE : Ellipsoid
engine/Source/Core/Ellipsoid.js 242

An Ellipsoid instance initialized to radii of (1.0, 1.0, 1.0).

static constant Cesium.Ellipsoid.WGS84 : Ellipsoid
engine/Source/Core/Ellipsoid.js 232

An Ellipsoid instance initialized to the WGS84 standard.

readonly maximumRadius : number
engine/Source/Core/Ellipsoid.js 163

Gets the maximum radius of the ellipsoid.

readonly minimumRadius : number
engine/Source/Core/Ellipsoid.js 152

Gets the minimum radius of the ellipsoid.

readonly oneOverRadii : Cartesian3
engine/Source/Core/Ellipsoid.js 130

Gets one over the radii of the ellipsoid.

readonly oneOverRadiiSquared : Cartesian3
engine/Source/Core/Ellipsoid.js 141

Gets one over the squared radii of the ellipsoid.

readonly radii : Cartesian3
engine/Source/Core/Ellipsoid.js 97

Gets the radii of the ellipsoid.

readonly radiiSquared : Cartesian3
engine/Source/Core/Ellipsoid.js 108

Gets the squared radii of the ellipsoid.

readonly radiiToTheFourth : Cartesian3
engine/Source/Core/Ellipsoid.js 119

Gets the radii of the ellipsoid raise to the fourth power.

方法

static Cesium.Ellipsoid.clone(ellipsoid, result) → Ellipsoid
engine/Source/Core/Ellipsoid.js 178

Duplicates an Ellipsoid instance.
参数名称 类型 描述信息
ellipsoid Ellipsoid The ellipsoid to duplicate.
result Ellipsoid 可选 The object onto which to store the result, or undefined if a new instance should be created.
返回值:
The cloned Ellipsoid. (Returns undefined if ellipsoid is undefined)

static Cesium.Ellipsoid.fromCartesian3(cartesian, result) → Ellipsoid
engine/Source/Core/Ellipsoid.js 213

Computes an Ellipsoid from a Cartesian specifying the radii in x, y, and z directions.
参数名称 类型 默认值 描述信息
cartesian Cartesian3 Cartesian3.ZERO 可选 The ellipsoid's radius in the x, y, and z directions.
result Ellipsoid 可选 The object onto which to store the result, or undefined if a new instance should be created.
返回值:
A new Ellipsoid instance.
Throws:
  • DeveloperError : All radii components must be greater than or equal to zero.
参考:

static Cesium.Ellipsoid.pack(value, array, startingIndex) → Array.<number>
engine/Source/Core/Ellipsoid.js 284

Stores the provided instance into the provided array.
参数名称 类型 默认值 描述信息
value Ellipsoid The value to pack.
array Array.<number> The array to pack into.
startingIndex number 0 可选 The index into the array at which to start packing the elements.
返回值:
The array that was packed into

static Cesium.Ellipsoid.unpack(array, startingIndex, result) → Ellipsoid
engine/Source/Core/Ellipsoid.js 305

Retrieves an instance from a packed array.
参数名称 类型 默认值 描述信息
array Array.<number> The packed array.
startingIndex number 0 可选 The starting index of the element to be unpacked.
result Ellipsoid 可选 The object into which to store the result.
返回值:
The modified result parameter or a new Ellipsoid instance if one was not provided.

cartesianArrayToCartographicArray(cartesians, result) → Array.<Cartographic>
engine/Source/Core/Ellipsoid.js 509

Converts the provided array of cartesians to an array of cartographics.
参数名称 类型 描述信息
cartesians Array.<Cartesian3> An array of Cartesian positions.
result Array.<Cartographic> 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new Array instance if none was provided.
使用示例:
//Create an array of Cartesians and determine their Cartographic representation on a WGS84 ellipsoid.
const positions = [new Cesium.Cartesian3(17832.12, 83234.52, 952313.73),
                 new Cesium.Cartesian3(17832.13, 83234.53, 952313.73),
                 new Cesium.Cartesian3(17832.14, 83234.54, 952313.73)]
const cartographicPositions = Cesium.Ellipsoid.WGS84.cartesianArrayToCartographicArray(positions);

cartesianToCartographic(cartesian, result) → Cartographic
engine/Source/Core/Ellipsoid.js 470

Converts the provided cartesian to cartographic representation. The cartesian is undefined at the center of the ellipsoid.
参数名称 类型 描述信息
cartesian Cartesian3 The Cartesian position to convert to cartographic representation.
result Cartographic 可选 The object onto which to store the result.
返回值:
The modified result parameter, new Cartographic instance if none was provided, or undefined if the cartesian is at the center of the ellipsoid.
使用示例:
//Create a Cartesian and determine it's Cartographic representation on a WGS84 ellipsoid.
const position = new Cesium.Cartesian3(17832.12, 83234.52, 952313.73);
const cartographicPosition = Cesium.Ellipsoid.WGS84.cartesianToCartographic(position);

cartographicArrayToCartesianArray(cartographics, result) → Array.<Cartesian3>
engine/Source/Core/Ellipsoid.js 433

Converts the provided array of cartographics to an array of Cartesians.
参数名称 类型 描述信息
cartographics Array.<Cartographic> An array of cartographic positions.
result Array.<Cartesian3> 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new Array instance if none was provided.
使用示例:
//Convert an array of Cartographics and determine their Cartesian representation on a WGS84 ellipsoid.
const positions = [new Cesium.Cartographic(Cesium.Math.toRadians(21), Cesium.Math.toRadians(78), 0),
                 new Cesium.Cartographic(Cesium.Math.toRadians(21.321), Cesium.Math.toRadians(78.123), 100),
                 new Cesium.Cartographic(Cesium.Math.toRadians(21.645), Cesium.Math.toRadians(78.456), 250)];
const cartesianPositions = Cesium.Ellipsoid.WGS84.cartographicArrayToCartesianArray(positions);

cartographicToCartesian(cartographic, result) → Cartesian3
engine/Source/Core/Ellipsoid.js 403

Converts the provided cartographic to Cartesian representation.
参数名称 类型 描述信息
cartographic Cartographic The cartographic position.
result Cartesian3 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new Cartesian3 instance if none was provided.
使用示例:
//Create a Cartographic and determine it's Cartesian representation on a WGS84 ellipsoid.
const position = new Cesium.Cartographic(Cesium.Math.toRadians(21), Cesium.Math.toRadians(78), 5000);
const cartesianPosition = Cesium.Ellipsoid.WGS84.cartographicToCartesian(position);

clone(result) → Ellipsoid
engine/Source/Core/Ellipsoid.js 265

Duplicates an Ellipsoid instance.
参数名称 类型 描述信息
result Ellipsoid 可选 The object onto which to store the result, or undefined if a new instance should be created.
返回值:
The cloned Ellipsoid.

equals(right) → boolean
engine/Source/Core/Ellipsoid.js 630

Compares this Ellipsoid against the provided Ellipsoid componentwise and returns true if they are equal, false otherwise.
参数名称 类型 描述信息
right Ellipsoid 可选 The other Ellipsoid.
返回值:
true if they are equal, false otherwise.

geocentricSurfaceNormal(cartesian, result) → Cartesian3
engine/Source/Core/Ellipsoid.js 324

Computes the unit vector directed from the center of this ellipsoid toward the provided Cartesian position.
参数名称 类型 描述信息
cartesian Cartesian3 The Cartesian for which to to determine the geocentric normal.
result Cartesian3 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new Cartesian3 instance if none was provided.

geodeticSurfaceNormal(cartesian, result) → Cartesian3
engine/Source/Core/Ellipsoid.js 365

Computes the normal of the plane tangent to the surface of the ellipsoid at the provided position.
参数名称 类型 描述信息
cartesian Cartesian3 The Cartesian position for which to to determine the surface normal.
result Cartesian3 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new Cartesian3 instance if none was provided, or undefined if a normal cannot be found.

geodeticSurfaceNormalCartographic(cartographic, result) → Cartesian3
engine/Source/Core/Ellipsoid.js 333

Computes the normal of the plane tangent to the surface of the ellipsoid at the provided position.
参数名称 类型 描述信息
cartographic Cartographic The cartographic position for which to to determine the geodetic normal.
result Cartesian3 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new Cartesian3 instance if none was provided.

getLocalCurvature(surfacePosition, result) → Cartesian2
engine/Source/Core/Ellipsoid.js 715

Computes the ellipsoid curvatures at a given position on the surface.
参数名称 类型 描述信息
surfacePosition Cartesian3 The position on the ellipsoid surface where curvatures will be calculated.
result Cartesian2 可选 The cartesian to which to copy the result, or undefined to create and return a new instance.
返回值:
The local curvature of the ellipsoid surface at the provided position, in east and north directions.
Throws:

getSurfaceNormalIntersectionWithZAxis(position, buffer, result) → Cartesian3|undefined
engine/Source/Core/Ellipsoid.js 662

Computes a point which is the intersection of the surface normal with the z-axis.
参数名称 类型 默认值 描述信息
position Cartesian3 the position. must be on the surface of the ellipsoid.
buffer number 0.0 可选 A buffer to subtract from the ellipsoid size when checking if the point is inside the ellipsoid. In earth case, with common earth datums, there is no need for this buffer since the intersection point is always (relatively) very close to the center. In WGS84 datum, intersection point is at max z = +-42841.31151331382 (0.673% of z-axis). Intersection point could be outside the ellipsoid if the ratio of MajorAxis / AxisOfRotation is bigger than the square root of 2
result Cartesian3 可选 The cartesian to which to copy the result, or undefined to create and return a new instance.
返回值:
the intersection point if it's inside the ellipsoid, undefined otherwise
Throws:

scaleToGeocentricSurface(cartesian, result) → Cartesian3
engine/Source/Core/Ellipsoid.js 556

Scales the provided Cartesian position along the geocentric surface normal so that it is on the surface of this ellipsoid.
参数名称 类型 描述信息
cartesian Cartesian3 The Cartesian position to scale.
result Cartesian3 可选 The object onto which to store the result.
返回值:
The modified result parameter or a new Cartesian3 instance if none was provided.

scaleToGeodeticSurface(cartesian, result) → Cartesian3
engine/Source/Core/Ellipsoid.js 538

Scales the provided Cartesian position along the geodetic surface normal so that it is on the surface of this ellipsoid. If the position is at the center of the ellipsoid, this function returns undefined.
参数名称 类型 描述信息
cartesian Cartesian3 The Cartesian position to scale.
result Cartesian3 可选 The object onto which to store the result.
返回值:
The modified result parameter, a new Cartesian3 instance if none was provided, or undefined if the position is at the center.

surfaceArea(rectangle) → number
engine/Source/Core/Ellipsoid.js 815

Computes an approximation of the surface area of a rectangle on the surface of an ellipsoid using Gauss-Legendre 10th order quadrature.
参数名称 类型 描述信息
rectangle Rectangle The rectangle used for computing the surface area.
返回值:
The approximate area of the rectangle on the surface of this ellipsoid.

toString() → string
engine/Source/Core/Ellipsoid.js 642

Creates a string representing this Ellipsoid in the format '(radii.x, radii.y, radii.z)'.
返回值:
A string representing this ellipsoid in the format '(radii.x, radii.y, radii.z)'.

transformPositionFromScaledSpace(position, result) → Cartesian3
engine/Source/Core/Ellipsoid.js 612

Transforms a Cartesian X, Y, Z position from the ellipsoid-scaled space by multiplying its components by the result of Ellipsoid#radii.
参数名称 类型 描述信息
position Cartesian3 The position to transform.
result Cartesian3 可选 The position to which to copy the result, or undefined to create and return a new instance.
返回值:
The position expressed in the unscaled space. The returned instance is the one passed as the result parameter if it is not undefined, or a new instance of it is.

transformPositionToScaledSpace(position, result) → Cartesian3
engine/Source/Core/Ellipsoid.js 591

Transforms a Cartesian X, Y, Z position to the ellipsoid-scaled space by multiplying its components by the result of Ellipsoid#oneOverRadii.
参数名称 类型 描述信息
position Cartesian3 The position to transform.
result Cartesian3 可选 The position to which to copy the result, or undefined to create and return a new instance.
返回值:
The position expressed in the scaled space. The returned instance is the one passed as the result parameter if it is not undefined, or a new instance of it is.
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