The multiple beam sonar system for terrainsurvey has met the system's requirement via the results of pool static experiments.
通过水池的初步静态实验，我们研制的多波束地形探测声纳系统已经达到了了系统的设计要求。
2
Nowadays, in mountain railroad engineering survey, the efficiency of traditional leveling method is low, is very difficult to practice because of terrain undulation being big.
目前在山区铁路工程测量过程中，由于地形起伏较大，传统的水准测量效率低，非常难以实施。
3
How to improve the accuracy ofterrain correction in mountainous-district gravity survey is an important subject which people have paid close attention to.