一个常见的要求,转化成高处gps高度海平面。
With an elevation more than 3,659 meters (12,000 feet) above mean sea level, the Altiplano is much higher than the Chaco to the east.Altiplano海拔3,659m(12,000英尺),比亚热带区高多了。
The focal plane of the light is 200 feet above mean sea level, and in clear weather it should be seen at a distance of 23 nautical miles.灯光的焦平面位于平均海平面以上200尺,如天气清朗,远至23海里的水域也能看见。