珠江口水域高精度似大地水准面的确定

摘要

陆海统一的似大地水准面模型是实现深度基准面和国家高程基准面转换的基础。利用珠江口水域收集到的重力资料以及22个高精度的GPS水准数据建立了该水域的似大地水准面数值模型，模型覆盖面积超过13000 km2，是目前国内海域范围最大、精度最高的区域性似大地水准面。通过内外符合性检查进行精度分析表明，应用重力和GPS水准融合确定的珠江口水域似大地水准面的精度达到±1.1 cm。%Quasi-geoid model based on the unified height datum of terrestrial and marine is the foundation to realize the transform between the depth datum and the national elevation .By collecting the pearl river estuary waters gravity model and 22 GPS leveling points with high precision ,the waters quasi-geoid numerical model in pear river estuary is es-tablished.It is the present domestic regional waters quasi-geoid,covering the biggest area more than 13 000 km2 and with the highest precision .Through the internal and external compliance-check and accuracy analysis show that ,the ac-curacy of the quasi-geoid determined by gravity and GPS leveling fusion methods reaches +/-1.1 cm.