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/** cesium 中转换公式* ellipsoid:* A quadratic surface defined in Cartesian coordinates by the equation* <code>(x / a)^2 + (y / b)^2 + (z / c)^2 = 1</code>. Primarily used* by Cesium to represent the shape of planetary bodies.* Cartographic:* A position defined by longitude, latitude, and height.*/varellipsoid=viewer.scene.globe.ellipsoid;varcartographic=Cesium.Cartographic.fromDegrees(lng,lat,alt);varcartesian3=ellipsoid.cartographicToCartesian(cartographic);
首先介绍一下相关涉及到的 相关坐标系统
1、平面坐标系(Cartesian2)
2、笛卡尔空间直角坐标系 - 世界坐标(Cartesian3)
3、地理坐标系 / 经纬度 [longitude,latitude] / 弧度 Cartographic
注:认识与理解 世界坐标(Cartesian3)与 地理坐标(cartographic)与 经纬度 / 弧度 是往下面看的必备基础。
常用的坐标转换
1、 经纬度 转 世界坐标
2、世界坐标 转 经纬度
3、屏幕坐标 转 世界坐标
4、世界坐标 转 屏幕坐标
2、屏幕中心点 转 世界坐标
2、 经纬度 转换成 度分秒表示法
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