發(fā)布時(shí)間：2019-06-11 01:43

【摘要】：以天山北坡烏魯木齊縣甘溝鄉(xiāng)為研究區(qū),利用美國SVC HR-768便攜式光譜儀采集25塊樣方的高光譜數(shù)據(jù),并測定對應(yīng)樣方中草地蓋度,分析草地蓋度與原始光譜、一階微分光譜和高光譜特征變量之間的相關(guān)關(guān)系;采用回歸統(tǒng)計(jì)的方法,基于高光譜位置變量、高光譜面積變量和高光譜植被指數(shù)變量構(gòu)建草地蓋度的估測模型,并進(jìn)行模型精度評價(jià)。結(jié)果表明,研究區(qū)草地蓋度與植被冠層光譜反射率相關(guān)性較強(qiáng)的波段范圍為354-704、1 420-1 481和1 904-2 512nm;基于一階微分光譜和高光譜植被指數(shù)構(gòu)建的估測模型能更好地反演草地蓋度。通過模型檢驗(yàn),確定基于560nm的光譜一階微分模型y=-384.153x+72.096可作為草地蓋度的最優(yōu)估測模型,模型均方根誤差為7.344%,估算精度為90.343%。
[Abstract]:Taking Ganggou Township, Urumqi County, northern slope of Tianshan Mountain as the study area, the hyperspectral data of 25 samples were collected by SVC HR-768 portable spectrometer in the United States, and the grassland coverage in the corresponding sample was measured, and the grassland coverage and original spectrum were analyzed. The correlation between the first order differential spectrum and the hyperspectral characteristic variable; Based on hyperspectral position variables, hyperspectral area variables and hyperspectral vegetation index variables, the estimation model of grassland coverage was constructed by regression statistics, and the accuracy of the model was evaluated. The results showed that the range of correlation between grassland coverage and spectral reflectivity of vegetation canopy was 354 鹵704, 1.420 鈮，

本文編號：2496905