The fast computation of terrain correction in a large area is significant for modern geodetic practice, especially in rough mountain areas.
大面积地形改正的快速计算，对现代大地测量实践具有重大意义，尤其是在那些地形复杂地区。
Correction on the computation formula of the number of Fortresses within the domains.
修正了堡垒的领地数字的计算公式。
Numerical results show the correction of calculation and effectiveness of parallel computation. Some parameters influencing speed up and efficiency are discussed.
数值算例表明流场计算的正确性和并行计算的有效性，并讨论了影响加速比和并行效率的各种因素。
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