The observer sitting problem is important in terrain visibility analysis and it is widely used in military, telecom, animal protection and so on.
观察点设置问题是地形可视性分析中的一类重要问题，在空间信息辅助决策、电信、野生动物保护等领域有着广泛的应用。
Terrain visibility analysis is an important task in military operation, and now, it has been applied to the fields such as telecommunication and tourism.
地形可视性分析是军事行动中的一项重要内容，近来，其应用已拓展到电信、旅游等领域中。
The observer sitting problem is important in terrain visibility analysis and is widely used in spatial information aid decision, telecom, and animal protection and so on.
观察点设置问题是地形可视性分析中的一类重要问题，在空间信息辅助决策、电信、野生动物保护等领域有着广泛的应用。
The terrain visibility analysis is widely used in military, telecom, touring and so on.
地形可视性分析在军事、电信、旅游等领域有着广泛的应用。
Expatiated on the application theory of basic orbit, including subastral point calculation, visibility analysis, coverage evaluating and spacecraft life-span estimate.
阐述了基本轨道应用分析理论，包括星下点轨迹计算、可见性分析、覆盖评估和轨道寿命估算。
Spatial visibility analysis is a novel method in urban morphology and spatial configuration, which is an important tool in space syntax.
空间可视分析是空间句法的重要依据，是进行城市空间形态分析的新方法。
Spatial visibility analysis is a novel method in urban morphology and spatial configuration, which is an important tool in space syntax.
空间可视分析是空间句法的重要依据，是进行城市空间形态分析的新方法。
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