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林业勘测中,树木的株数、树高、冠幅是森林调查工作中的重要测树因子。野外现场的森调工作,不仅劳动量很大,并且受到气候、地理、交通乃至毒虫猛兽等不利因素的影响,效率不高。现场使用的测树仪器(测高仪、皮尺等)量测树高和冠幅,受到树木的阴挡和枝叶的遮蔽影响,妨碍通视和量测、测定树高的相对精度,一般为树高的5％或更差。以往林业摄影测量遥感技术工作中,有时也应用航摄像片(航片)进行测树,航片比例尺为
In the forestry survey, the number of trees, the height of the tree and the crown are the important tree-finding factors in the forest investigation. Mori field work in the field, not only a large amount of labor, and by the climate, geography, transportation and even the adverse effects of poisonous beasts and other adverse effects, inefficient. Tree-measuring instruments (altimeter, tape measure, etc.) used in the field are used to measure the height of the tree and the width of the crown, which is affected by the shade of the trees and the shading of branches and leaves, hindering the visualization and measurement, and determining the relative precision of the tree height. High 5% or worse. In the past, forestry photogrammetry and remote sensing technology work, sometimes also used aerial photos (aerial photos) tree, aerial scale scale