By using observation data over 50 years, the paper systematically analyzed the relations of different stand density with diameter, height, crown of trees and so on.

利用近50年的系统定位观测资料，分析红松果材兼用林不同林分密度与直径、树高、冠幅等主要测树因子的关系。

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And under the condition of propagating against weak wind, most of medium-scale gravity waves can reach observation height.

而在弱逆风作用下，大部分中尺度范围重力波都能够传播到观测高度。

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The impact of shrub coverage and height on surface wind and aerodynamic parameters is systematically studied through field study and fixed observation.

通过野外实地调查和定位观测，系统研究了灌木林盖度和高度对地表风况及空气动力学参数的影响。

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The pair will soon begin an intense observation campaign that will pin down the variation in height across the globe to an accuracy of better than two metres.

BBC: German radar satellites fly tight space waltz

One example of continuous observation of ecological change is provided by the Nenets in Northwest Russia, who report increases in the height of willow and alder shrubs in the tundra zone.

UNESCO: EDUCATION