Geophysical Survey Datasets - Elevation

Digital Elevation data record the terrain height variations from the processed point-located data recorded during a geophysical survey. The data acquired are a mass of ground heights representing a terrain surface. The data are either geoidal (representing the vertical distance from a location on the Earth's surface to the geoid) or ellipsoidal (representing the vertical distance from a location on the Earth's surface to the ellipsoid). The data are given in units of meters. The processed data is checked for quality by GA geophysicists to ensure that the final data released by GA are fit-for-purpose.

数字高程数据（Digital Elevation data）记录了通过地球物理勘探（geophysical survey）期间采集的点位数据经处理后得到的地形高度变化。采集到的数据是代表地形表面的大量地面高程值。这些数据分为两类：大地水准面数据（geoidal，代表地球表面某点到大地水准面的垂直距离）和椭球面数据（ellipsoidal，代表地球表面某点到椭球面的垂直距离）。数据单位为米。GA的地球物理学家会对处理后的数据进行质量检查，以确保GA最终发布的数据符合用途要求。