The Ethiopian gravimetric quasi-geoid: ETH-QM21

The ETH-QM21 model is a gravimetric quasigeoid of 2'x2' spatial resolution developed over Ethiopia. This solution has been derived from the ETH-GM21 gravimetric geoid model by using the ETH-GQS geoid-to-quasigeoid separation surface over Ethiopia (see Dataset Description). Considering the rough topography of Ethiopia, the ETH-QM21 would be beneficial for normal height measurements. The ETH-QM21 model would be beneficial for normal height measurements, also considering the rough topography of Ethiopia. The geoid model is provided in ISG format 2.0 (ISG Format Specifications), while the file in its original data format is available at the model ISG webpage.

ETH-QM21模型是覆盖埃塞俄比亚区域、空间分辨率为2角分×2角分的重力似大地水准面模型。该模型基于ETH-GM21重力大地水准面模型，通过采用覆盖埃塞俄比亚区域的ETH-GQS大地水准面-似大地水准面分离面计算得到（详见数据集描述）。考虑到埃塞俄比亚地形崎岖，ETH-QM21模型对正常高测量具有重要参考价值。同时，鉴于埃塞俄比亚地形复杂，该模型亦有助于正常高测量工作的开展。该大地水准面模型以ISG格式2.0（ISG Format Specifications）提供，其原始数据格式文件可通过模型的ISG网页获取。