主要功能
采(cai)用(yong)(yong)開放(fang)式架構體系(xi),精確研究物品在(zai)色(se)彩方面(mian)的面(mian)積分布及其相(xiang)關參數(shu)(shu);運用(yong)(yong)各種(zhong)圖形捕捉設(she)備獲取(qu)高(gao)質(zhi)量葉片圖形,運用(yong)(yong)專業軟件分析(xi)計算物品顏色(se)分布等相(xiang)關參數(shu)(shu);在(zai)地表覆蓋研究中:采(cai)用(yong)(yong)數(shu)(shu)碼相(xiang)機(ji)攝取(qu)草地冠層的圖像,用(yong)(yong)專用(yong)(yong)軟件計算綠(lv)色(se)植(zhi)物、土(tu)地、病變植(zhi)物或(huo)其它(ta)物體所占比例。
NDVI(歸一化植被指數)=(NIR-R)/(NIR+R),或(huo)兩(liang)個波段反射率的(de)計算(suan),和植物(wu)的(de)蒸騰作用、太陽光的(de)截取、光合作用以及地表(biao)凈(jing)初級生產力等(deng)密切相(xiang)關。
· NDVI 的應用:檢測(ce)植被生長狀態、植被覆蓋度和消(xiao)除部分輻射(she)誤差(cha)等;
· -1<=NDVI<=1,負(fu)值(zhi)表示地面覆蓋為云、水、雪等(deng),對可(ke)見光高反射(she);0 表示有巖石或裸(luo)土等(deng),NIR 和(he) R 近似相等(deng);正值(zhi),表示有植被(bei)覆蓋,且隨覆蓋度增(zeng)(zeng)大而增(zeng)(zeng)大;
· NDVI 的(de)(de)局(ju)限性表現(xian)在,用非線性拉伸的(de)(de)方式增(zeng)強了 NIR 和 R 的(de)(de)反(fan)射率的(de)(de)對(dui)比度。對(dui)于(yu)同一(yi)幅圖(tu)像,分別求(qiu) RVI 和 NDVI 時會發現(xian),RVI 值增(zeng)加的(de)(de)速度高(gao)于(yu) NDVI 增(zeng)加速度,即 NDVI 對(dui)高(gao)植被區具有較低(di)的(de)(de)靈(ling)敏度;
· NDVI 能反映出(chu)植物冠層的(de)背(bei)景(jing)影響,如土壤、潮濕(shi)地(di)面、學、枯葉、粗超度(du)等(deng),且與植被覆蓋有關(guan)。
測量(liang)參數
基本測量數據:分析區域面(mian)(mian)積,分析對象(xiang)長度、寬度、面(mian)(mian)積,顏色分類等。
個體測量(liang)參數:面積、長度、寬度、周(zhou)長、性狀因子,顏(yan)色分類分析。
顏(yan)色類參數:NDVI,綠(lv)色度(Greenness),用戶(hu)自定義顏色指數、物(wu)體輪廓信(xin)息測(ce)量。
應(ying)用領域(yu)
廣泛運用于農藝和林學等形態學、病理學研究(jiu)領域。在(zai)地(di)表覆蓋研究(jiu)中,可應用于草地(di)、花卉、蔬菜,植物(wu)幼苗生(sheng)(sheng)長初期(qi)(First Growth)冠層覆蓋度的(de)研究(jiu),或果(guo)實生(sheng)(sheng)長初期(qi)的(de)研究(jiu)。
主要技術參數(shu)
圖像獲取設備(bei)參數(shu)
數碼相機:1200 萬像素(su),內置鏡頭,獲取適(shi)合 NDVI 分析的(de)(de) jpeg 圖像,紅色通道包含的(de)(de)近紅外(wai)光譜數據,而藍色包含可見光數據,內置存(cun)儲,重量小于 200 g。(注(zhu):不能獲取傳統(tong) RGB 彩色圖像)
分析軟件參數
選購指南(nan):
圖(tu)像撲捉系(xi)統(tong):經(jing)廠家(jia)調試的數碼相機圖(tu)像采集設備
植物顏色分析(xi)軟(ruan)件:標準版 /專業版 WinCAM 分析(xi)軟(ruan)件。
產(chan)地:加拿大 Regent
參考文獻
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