قارن الطرق

	تقدير الغطاء النباتي للتاج	قياس ارتفاع الشجرة
المجال	علوم الغابات	علوم الغابات
العائلة	Process / pipeline	Process / pipeline
سنة النشأة	2000s	1950s–2000s
صاحب الطريقة	Jennings, Brown, Sheil, and colleagues	Bitterlich and classical forestry mensuration
النوع	Measurement and estimation pipeline	Measurement pipeline
المصدر التأسيسي	Jennings, S. B., Brown, N. D., & Sheil, D. (2000). Assessing Forest Canopies and Understorey Illumination: Methods and Applications. Forest Ecology and Management, 129(1-3), 219–243.	Bitterlich, W. (1984). The Relascope Idea: Relative Measurements in Forestry. Commonwealth Agricultural Bureaux.
الأسماء البديلة	Canopy closure measurement, Crown cover estimation, Overstory density assessment	Dendrometric height, Tree elevation measurement, Stand height determination
ذات صلة	4	4
الملخص	Canopy cover, or canopy closure, is the proportion of ground area covered by tree crowns when viewed from above, typically expressed as a percentage. Formalized by Jennings and colleagues in pioneering work on tropical forest structure, canopy cover estimation employs multiple methods—from field-based ocular assessment to sophisticated remote sensing and terrestrial LiDAR—providing essential data on forest structure, light availability, and habitat characteristics relevant to ecology, silviculture, and climate research.	Tree height measurement—determining the vertical distance from ground to tree top—is a cornerstone of forest inventory and biomass estimation. Ranging from classical optical instruments (clinometer, Abney level) to modern laser hypsometers and airborne LiDAR, tree height quantification enables calculation of volume, biomass, site index (productivity), and forest structural characterization essential for management, research, and carbon accounting.