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題 名 | Comparison of Forest Canopy Height Derived Using Lidar Data and Aerial Photos=應用空載雷射掃描資料與航空照片獲取林分高度之比較 |
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作 者 | 詹進發; | 書刊名 | 臺灣林業科學 |
卷 期 | 20:1 2005.03[民94.03] |
頁 次 | 頁13-27 |
分類號 | 436.718 |
關鍵詞 | 空載雷射掃描; 航空測量; 數值表面模型; 數值地形模型; 林分高度; Lidar; Photogrammetry; Digital surface model; Digital elevation model; Forest canopy height; |
語 文 | 英文(English) |
中文摘要 | 森林之組成與垂直結構提供了重要的資訊,有助於了解森林生態系之生態狀態與過程,近年來空載雷射掃描技術的發展,促進了應用空載雷射掃描於調查森林植被結構之研究。本研究之目的為發展應用雷射掃描儀獲取林分高度之方法,使用之資料為利用Leica ALS40掃描闊葉樹林所產生的資料。為了評估空載雷射掃描用於估測林分之植被高度的能力,本研究由空載雷射掃描資料之區域極大值萃取出林分數值表面模型,並將其與航測方法所產生的林分數值表面模型做比較。此外,以林分數值表面模型與一四公尺解析力之數值地形模型之差推估林分植被高度,並比較由空載雷射掃描與航測兩種資料所產生之林分高度。研究結果顯示,由空載雷射掃描資料所估測之林分高度略大於由航測所產生之林分高度,其高度差之平均值為0.22 m,標準差為2.59 m。 |
英文摘要 | Forest composition and vertical structure provide essential information for understanding ecological states and processes in forest ecosystems. Recent development of lidar (light detection and ranging) technologies has led to applications of lidar in forest canopy structure investigations. The objective of this study was to develop a method to derive forest canopy height using a laser scanning instrument. Lidar data, acquired using a Leica ALS40 airborne laser scanner, of a deciduous forest were used in this study. In order to assess the capability of lidar for estimating canopy height of forest stands, a digital surface model derived from the local maximum of lidar data was compared to a digital surface model generated using a photogrammetric technique. In addition, forest canopy heights, represented by differences in the digital surface models and a 4-m digital elevation model, were calculated and compared for these 2 types of data. The results indicated that the canopy height generated from the lidar data was higher than that of the aerial photos, and the mean difference was about 0.22 m with a standard deviation of 2.59 m. |
本系統中英文摘要資訊取自各篇刊載內容。