主要功能
采用開放式架構體系,精確研究物品在色彩方面的面積分布及其相關參數(shù);運用各種圖形捕捉設備獲取高質(zhì)量葉片圖形,運用專業(yè)軟件分析計算物品顏色分布等相關參數(shù);在地表覆蓋研究中:采用數(shù)碼相機攝取草地冠層的圖像,用專用軟件計算綠色植物、土地、病變植物或其它物體所占比例。
NDVI(歸一化植被指數(shù))=(NIR-R)/(NIR+R),或兩個波段反射率的計算,和植物的蒸騰作用、太陽光的截取、光合作用以及地表凈初級生產(chǎn)力等密切相關。
· NDVI 的應用:檢測植被生長狀態(tài)、植被覆蓋度和消除部分輻射誤差等;
· -1<=NDVI<=1,負值表示地面覆蓋為云、水、雪等,對可見光高反射;0 表示有巖石或裸土等,NIR 和 R 近似相等;正值,表示有植被覆蓋,且隨覆蓋度增大而增大;
· NDVI 的局限性表現(xiàn)在,用非線性拉伸的方式增強了 NIR 和 R 的反射率的對比度。對于同一幅圖像,分別求 RVI 和 NDVI 時會發(fā)現(xiàn),RVI 值增加的速度高于 NDVI 增加速度,即 NDVI 對高植被區(qū)具有較低的靈敏度;
· NDVI 能反映出植物冠層的背景影響,如土壤、潮濕地面、學、枯葉、粗超度等,且與植被覆蓋有關。
測量參數(shù)
基本測量數(shù)據(jù):分析區(qū)域面積,分析對象長度、寬度、面積,顏色分類等。
個體測量參數(shù):面積、長度、寬度、周長、性狀因子,顏色分類分析。
顏色類參數(shù):NDVI,綠色度(Greenness),用戶自定義顏色指數(shù)、物體輪廓信息測量。
應用領域
廣泛運用于農(nóng)藝和林學等形態(tài)學、病理學研究領域。在地表覆蓋研究中,可應用于草地、花卉、蔬菜,植物幼苗生長初期(First Growth)冠層覆蓋度的研究,或果實生長初期的研究。
主要技術參數(shù)
圖像獲取設備參數(shù)
數(shù)碼相機:1200 萬像素,內(nèi)置鏡頭,獲取適合 NDVI 分析的 jpeg 圖像,紅色通道包含的近紅外光譜數(shù)據(jù),而藍色包含可見光數(shù)據(jù),內(nèi)置存儲,重量小于 200 g。(注:不能獲取傳統(tǒng) RGB 彩色圖像)
分析軟件參數(shù)
選購指南:
圖像撲捉系統(tǒng):經(jīng)廠家調(diào)試的數(shù)碼相機圖像采集設備
植物顏色分析軟件:標準版 /專業(yè)版 WinCAM 分析軟件。
產(chǎn)地:加拿大 Regent
參考文獻
原始數(shù)據(jù)來源:Google Scholar
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