光谱学与光谱分析 |
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Cross Comparison of ASTER and Landsat ETM+ Multispectral Measurements for NDVI and SAVI Vegetation Indices |
XU Han-qiu, ZHANG Tie-jun |
Institute of Remote Sensing Information Engineering, Fuzhou University,College of Environment and Resources, Fuzhou University,Fuzhou 350108, China |
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Abstract The present paper investigates the quantitative relationship between the NDVI and SAVI vegetation indices of Landsat and ASTER sensors based on three tandem image pairs. The study examines how well ASTER sensor vegetation observations replicate ETM+ vegetation observations, and more importantly, the difference in the vegetation observations between the two sensors. The DN values of the three image pairs were first converted to at-sensor reflectance to reduce radiometric differences between two sensors,images. The NDVI and SAVI vegetation indices of the two sensors were then calculated using the converted reflectance. The quantitative relationship was revealed through regression analysis on the scatter plots of the vegetation index values of the two sensors. The models for the conversion between the two sensors,vegetation indices were also obtained from the regression. The results show that the difference does exist between the two sensors,vegetation indices though they have a very strong positive linear relationship. The study found that the red and near infrared measurements differ between the two sensors, with ASTER generally producing higher reflectance in the red band and lower reflectance in the near infrared band than the ETM+ sensor. This results in the ASTER sensor producing lower spectral vegetation index measurements, for the same target, than ETM+. The relative spectral response function differences in the red and near infrared bands between the two sensors are believed to be the main factor contributing to their differences in vegetation index measurements, because the red and near infrared relative spectral response features of the ASTER sensor overlap the vegetation “red edge” spectral region. The obtained conversion models have high accuracy with a RMSE less than 0.04 for both sensors’ inter-conversion between corresponding vegetation indices.
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Received: 2010-09-25
Accepted: 2010-12-10
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Corresponding Authors:
XU Han-qiu
E-mail: hxu@fzu.edu.cn.cn; fdy@public.fz.fj.cn
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