AUSGeoid98 v.1.0 data files: Gunanya (sf51-14)

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 Data format: AUSGeoid98 data files have a header record at the start of each file, to distinguish them from the superseded AUSGeoid93 data files. AUSGeoid98 data files show the geoid-ellipsoid separation to 3 decimal places, while the superseded AUSGeoid93 data files showed only 2 decimal places.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，可用于插值所需位置的大地水准面-椭球面差距（geoid-ellipsoid separation）。您可以使用自行开发的插值软件，也可采用澳大利亚地球科学局（Geoscience Australia）的Windows插值软件Winter。数据文件为标准格式的文本文件，其覆盖范围与标准地形图区域一致。提供覆盖1:250,000（约100×150 km）和1:1,000,000（约400×600 km）比例尺地图区域的文件。每个区域的所有边界均存在4分的重叠。数据格式：AUSGeoid98数据文件在开头包含一个头记录，以区别于已被取代的AUSGeoid93数据文件。AUSGeoid98数据文件显示的大地水准面-椭球面差距精确到3位小数，而被取代的AUSGeoid93数据文件仅精确到2位小数。AUSGeoid98的垂直偏差（deflections of the vertical）由大地水准面-椭球面差距曲面计算得出，而AUSGeoid93的垂直偏差则基于OSU91A计算。