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首页> 外文期刊>Annals of Forest Science >Evaluation of estimates of crown condition in forest monitoring: comparison between visual estimation and automated crown image analysis.
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Evaluation of estimates of crown condition in forest monitoring: comparison between visual estimation and automated crown image analysis.

机译：森林监测中树冠状况评估的评估：视觉评估与自动树冠图像分析之间的比较。

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Context: In long-term forest monitoring, tree crown condition has been visually rated to diagnose tree vigor and forest condition. However, visual estimates are subjective. A semiautomatic image analysis system, called CROCO, was developed to estimate crown condition quantitatively. CROCO calculates a DSO value which decrease with increasing crown transparency. Aims: This study aims to verify visual estimates objectively using CROCO and to assess characteristics of visual estimates and DSO values by comparing the effectiveness as indicators of radial growth. Methods: Crown condition of Abies mariesii was visually rated using a vitality index, and DSO values of the same trees were calculated. Results: When the top of the tree was intact, the trees with a higher vitality index showed a significantly higher DSO. Vitality index showed the strongest relationship with DBH increment for 8 years. DSO had a significant relationship with DBH increment by adding information of the crown top condition. Conclusion: Analysis of tree crown images is effective to verify visual estimates. Vitality index is a synthetic index involving factors affecting radial growth. DSO could be utilized similarly to vitality index, as an indicator of radial growth, by addition of information on crown size and/or shape.Digital Object Identifier http://dx.doi.org/10.1007/s13595-011-0132-9
机译：背景：在长期的森林​​监测中，已经对树冠状况进行了视觉评估，以诊断树木的活力和森林状况。但是，视觉估计是主观的。开发了一种称为CROCO的半自动图像分析系统，以定量估算胎冠状况。 CROCO计算出的DSO值会随着冠透明度的增加而降低。目的：本研究旨在使用CROCO客观地验证视觉估计，并通过比较作为放射状生长指标的有效性来评估视觉估计和DSO值的特征。方法：使用生命力指数目测马齿A的冠状状况，并计算同一棵树的DSO值。结果：当树的顶部完好无损时，具有较高生命力指数的树显示出更高的DSO。活力指数显示与DBH增加8年的关系最强。通过添加冠顶条件信息，DSO与DBH增量具有显着关系。结论：分析树冠图像可以有效地验证视觉估计。活力指数是一个综合指数，涉及影响径向生长的因素。通过添加有关冠的大小和/或形状的信息，可以将DSO与活力指数类似地用作径向生长的指标。数字对象标识符http://dx.doi.org/10.1007/s13595-011-0132-9

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