AUSGeoid98 v.1.0 data files: Forrest (sh52-10)

AUSGeoid98 data files contain a 2 minute grid of AUSGeoid98 data covering the Australian region, which you can use to interpolate geoid-ellipsoid separations for the positions required.You can use your own interpolation software, or you can use Geoscience Australia's Windows Interpolation software (Winter). The data files are text files in a standard format that cover the same area as standard topographic map areas. Files covering both 1:250,000 (approximately 100 x 150 km) and 1:1,000,000 (approximately 400 x 600 km) map areas are available. There is a 4 minute overlap on all sides of each area. Data format: AUSGeoid98 data files have a header record at the start of each file, to distinguish them from the superseded AUSGeoid93 data files. AUSGeoid98 data files show the geoid-ellipsoid separation to 3 decimal places, while the superseded AUSGeoid93 data files showed only 2 decimal places. AUSGeoid98 deflections of the vertical were computed from the geoid-ellipsoid separation surface, while the AUSGeoid93 deflections of the vertical were computed from OSU91A.

AUSGeoid98数据文件包含覆盖澳大利亚区域的2分网格数据，可用于对所需位置的大地水准面-椭球面差距进行插值计算。您可使用自有插值软件，或采用澳大利亚地球科学局（Geoscience Australia）的Windows插值软件（Winter）。这些数据文件为标准格式的文本文件，覆盖范围与标准地形图区域一致，包含1:250,000（约100×150公里）和1:1,000,000（约400×600公里）两种比例尺的区域，且各区域间存在4分钟的重叠。数据格式：每个AUSGeoid98数据文件开头均设有头记录，以区别于已被取代的AUSGeoid93数据文件；AUSGeoid98数据文件中大地水准面-椭球面差距保留三位小数，而AUSGeoid93仅保留两位小数；AUSGeoid98的垂线偏差由大地水准面-椭球面差距曲面计算得出，AUSGeoid93的垂线偏差则基于OSU91A计算。