Cesium 获取BBOX
const getBBOX = (cartesian: Cesium.Cartesian3) => {let cartographic = Cesium.Cartographic.fromCartesian(cartesian);let lon = Cesium.Math.toDegrees(cartographic.longitude);let lat = Cesium.Math.toDegrees(cartographic.latitude);const width_distance =lon + (0.5 * 360) / Math.pow(2, 18) - (lon - (0.5 * 360) / Math.pow(2, 18));const height_distance =lat + (0.5 * 360) / Math.pow(2, 18) - (lat - (0.5 * 360) / Math.pow(2, 18));const left = lon - 0.5 * width_distance;const bottom = lat - 0.5 * height_distance;const right = lon + 0.5 * width_distance;const top = lat + 0.5 * height_distance;const BBOX = left + ',' + bottom + ',' + right + ',' + top;return BBOX;
};
