精化山区大地水准面数据源分析

Analysis of the data source for determining mountainous area geoid

精化大地水准面能为GPS高程测量提供精度相当的高程参考基准。详细分析了确定山区大地水准面的数据源以及获取方法。精化山区大地水准面的数据源包括数字地形模型(DTM)、GPS水准数据、重力数据以及全球重力场参考模型等。一方面是要充分利用已有的数据源,另一方面是根据西部山区的实际地形情况和重力异常变化情况,在达到精度要求的前提下,采取更经济的的数据采集手段,完成对山区大地水准面的精化工作。

Geoid can be able to provide the precise reference datum for surveying elevation with GPS. To determine mountainous area geoid, this article analyzed the data source and the method by which gain it. The data source determining the mountainous area geoid is： the digital terrain model （DTM）, GPS leveling data, gravity data as well as global gravitational field reference model and so on. On the one hand, we must fully use the data source that we had already; on the other hand, accordingly to the actual terrain conditions of the western mountainous area and the variety of the gravity anomaly, we should adopt the more economical methods to acquire data and complete to the mountainous area geoid determination work.