The Study Based on Rectification of Vegetation Indices with Dust Impact
CHEN Fan-tao1, 2, ZHAO Wen-ji1, 2*, YAN Xing3
1. Key Laboratory of 3D Information Acquisition and Application of Ministry of Education, Capital Normal University，Beijing 100048, China 2. Resources, Environment and Geographic Information System Key Laboratory of Beijing，Capital Normal University, Beijing 100048, China 3. The Department of Land Surveying and Geo-Informatics，The Hong Kong Polytechnic University，Hong Kong，China
Abstract：Vegetation indicesarethe simplest and most effective metric parameters representing the features of vegetation cover and growth condition. This paper used Euonymus japonicas Thunb as a study case and collected 200 leaf samples in 20 locations. Using electronic analytical balance and ASD hyperspectral radiometer with Win FOLIA leaf area meter obtainedthe data of the amount of dust, spectral information and leaf area. Through comparative analysis between dust and clean leaves, differences of spectral curve and vegetation indices were apparent. Then, combined with dust weight and spectral data, dust correction modelsfor vegetation indices were built. The analysis results showedthat the spectral curve between clean and dust leaves havetypical characteristics: blue edge and red edge were at 520 and 705 nm; however, dust influenced leaf reflectance significantly in range of 350～700, 750～1 350, 1 500～1 850, 1 900～2 100 nm wavelength, and had a greater impact on vegetation indices. With dust weight increasing, the linear correlation of dust with NDVI and PRI was non-significant, but that with NDWI, NDII and CAI was still significant. The verification of correction models showedthat coefficient of determination (R2) of NDVI, NDII, CAI and PRI were 0.547, 0.430, 0.653 and 0.96 and their root mean square error (RMSE) was 0.035, 0.020, 0.112 and 0.009 respectively. Furthermore, itshowed that applyingdust correction models can improve the accuracy of vegetation indices calculation.
Key words：Euonymus japonicas;Spectral data;Vegetation index;Amount of dust absorption;Regression analysis
陈凡涛1, 2，赵文吉1，2*，晏 星3 . 尘埃影响下的植被指数修正研究 [J]. 光谱学与光谱分析, 2015, 35(10): 2830-2835.
CHEN Fan-tao1, 2, ZHAO Wen-ji1, 2*, YAN Xing3 . The Study Based on Rectification of Vegetation Indices with Dust Impact . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2015, 35(10): 2830-2835.
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