创建4490椭球体和切片方案
var cgs2000Ellipsolid = new Cesium.Ellipsoid(6378137.0, 6378137.0, 6356752.31414035585);
var cgs2000GeographicProj = new Cesium.GeographicProjection(cgs2000Ellipsolid);
var viewer = new Cesium.Viewer('cesiumContainer', {
mapProjection: cgs2000GeographicProj,
})
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