Cesium 中坐标相互转换

坐标类型

Cartographic

https://cesium.com/learn/cesiumjs/ref-doc/Cartographic.html
A position defined by longitude, latitude, and height.

Name	Type	Default	Description	Unit
longitude	number	0.0		radians
latitude	number	0.0		radians
height	number	0.0	the height above the ellipsoid	meters

Cartesian3

https://cesium.com/learn/cesiumjs/ref-doc/Cartesian3.html
A 3D Cartesian point.

Name	Type	Default	Desciption	Unit
x	number	0.0
y	number	0.0
z	number	0.0

Cesium 中坐标相互转换

经纬度 degree <-> 弧度 radian

radians -> degrees

• [static] Cesium.Math.toDegrees(radians) → number

const coordWGS84Lon = Cesium.Math.toDegrees(coordCartographic.longitude);
const coordWGS84Lat = Cesium.Math.toDegrees(coordCartographic.latitude);

degrees -> radians

• [static] Cesium.Math.toRadians(degrees) → number

const coordCartographicLon = Cesium.Math.toRadians(coordWGS84Lon);
const coordCartographicLat = Cesium.Math.toRadians(coordWGS84Lat);

1. Cartographic <-> GCS(WGS84)

1.1 Cartographic -> GCS(WGS84)

• [static] Cesium.Math.toDegrees(radians) → number

const coordWGS84Lon = Cesium.Math.toDegrees(coordCartographic.longitude);
const coordWGS84Lat = Cesium.Math.toDegrees(coordCartographic.latitude);
const coordWGS84Height = coordCartographic.height;

return [coordWGS84Lon, coordWGS84Lat, coordWGS84Height];

1.2 GCS(WGS84) -> Cartographic

• [static] Cesium.Cartographic.fromDegrees(longitude, latitude, height, result) → Cartographic

const coordCartographic = Cesium.Cartographic.fromDegrees(coordWGS84Lon, coordWGS84Lat, coordWGS84Height, resultCartographic);

2. Cartesian3 <-> Cartographic

2.1 Cartesian3 -> Cartographic

• [static] Cesium.Cartographic.fromCartesian(cartesian, ellipsoid, result) → Cartographic

const coordCartographic = Cesium.Cartographic.fromCartesian(coordCartesian3);

• cartesianToCartographic(cartesian, result) → Cartographic

const coordCartographic = Cesium.Ellipsoid.WGS84.cartesianToCartographic(coordCartesian3);

2.2 Cartographic -> Cartesian3

• [static] Cesium.Cartographic.toCartesian(cartographic, ellipsoid, result) → Cartesian3

const coordCartesian3 = Cesium.Cartographic.toCartesian(coordCartographic);

3. Cartesian3 <-> GCS(WGS84)

3.1 Cartesian3 -> GCS(WGS84)

需要通过 Cartographic 做过渡
Cartesian3 -> Cartographic -> WGS84

3.1.1 通过 Cesium.Cartographic.fromCartesian

• [static] Cesium.Cartographic.fromCartesian(cartesian, ellipsoid, result) → Cartographic

const coordCartographic = Cesium.Cartographic.fromCartesian(coordCartesian3);

const coordWGS84Lon = Cesium.Math.toDegrees(coordCartographic.longitude);
const coordWGS84Lat = Cesium.Math.toDegrees(coordCartographic.latitude);
const coordWGS84Height = coordCartographic.height;

return [coordWGS84Lon, coordWGS84Lat, coordWGS84Height];

3.1.2 通过 Cesium.Ellipsoid.WGS84.cartesianToCartographic

单个坐标转换

• cartesianToCartographic(cartesian, result) → Cartographic

const coordCartographic = Cesium.Ellipsoid.WGS84.cartesianToCartographic(coordCartesian3);

const coordWGS84Lon = Cesium.Math.toDegrees(coordCartographic.longitude);
const coordWGS84Lat = Cesium.Math.toDegrees(coordCartographic.latitude);
const coordWGS84Height = coordCartographic.height;

return [coordWGS84Lon, coordWGS84Lat, coordWGS84Height];

多个坐标转换

• cartesianArrayToCartographicArray(cartesians, result) → Cartographic Array

const coordCartographicArray = Cesium.Ellipsoid.WGS84.cartesianArrayToCartographicArray(coordCartesian3Array);

const coordWGS84Array = new Array(coordCartographicArray.length)
coordCartographicArray.forEach((coordCartographic, index) => {
	const coordWGS84Lon = Cesium.Math.toDegrees(coordCartographic.longitude);
	const coordWGS84Lat = Cesium.Math.toDegrees(coordCartographic.latitude);
	const coordWGS84Height = coordCartographic.height;
	coordWGS84Array[index] = [coordWGS84Lon, coordWGS84Lat, coordWGS84Height];
})

return coordWGS84Array;

3.2 GCS(WGS84) -> Cartesian3

WGS84 -> Cartesian3

• [static] Cesium.Cartesian3.fromDegrees(longitude, latitude, height, ellipsoid, result) → Cartesian3

const position = Cesium.Cartesian3.fromDegrees(-115.0, 37.0);

WGS84 -> Cartographic -> Cartesian3

• [static] Cesium.Cartographic.fromDegrees(longitude, latitude, height, result) → Cartographic
• [static] Cesium.Cartographic.toCartesian(cartographic, ellipsoid, result) → Cartesian3

const coordCartographic = Cesium.Cartographic.fromDegrees(coordWGS84Lon, coordWGS84Lat, coordWGS84Height);

const coordCartesian3 = Cesium.Cartographic.toCartesian(coordCartographic);

return coordCartesian3;