| 光谱学与光谱分析 |
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| Validation of HJ-1 HSI Red Edge Parameters Based on Spectral Reflectance of Hyperion |
| MENG Ji-hua1，2, WU Bing-fang1*, NIU Li-ming1, DU Xin1, CHEN Xue-yang1, ZHANG Fei-fei1 |
1. Institute of Remote Sensing Applications, Chinese Academy of Sciences, Beijing 100101, China
2. State Key Laboratory of Remote Sensing Science, Jointly Sponsored by the Institute of Remote Sensing Applications of Chinese Academy of Sciences and Beijing Normal University, Beijing 100101, China |
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Abstract To validate the HJ-1A HSI red edge indices, spectral reflectance data from EO-1 Hyperion of close date were used to simulate the band reflectance of HJ-1A HSI. Four red edge indices (red vale position, red edge position, red edge slop and red edge swing) were extracted from both simulated and actual HJ-1A HSI band reflectance. Comparisons of the 4 red edge indices between simulated and actual HJ-1A HSI were made to validate the red edge indices product of HJ-1A HSI. The average correlation coefficient of red edge reflectance between actual and simulated HJ-1A HSI is 0.946 and its standard deviation is 0.011, thus a high consistency could be found. The correlation coefficients of red edge indices between simulated and actual HJ-1A HSI were 0.414, 0.543, 0.808 and 0.802 for red edge position, red vale position, the red edge swing and red edge slop respectively. An obvious regular varying trend was found for these 4 red edge indices along different vegetation cover fraction. The standard deviations of differential images between real and simulated HJ-1A HSI red edge indices are 5.75, 1.86, 5.7 e-4 and 0.024. The result showed that the red edge indices from HJ-1A HSI is consistent with that from simulated indices from Hyperion; the vegetation variation could be effectively reflected in HJ-1A HSI red edge indices.
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Received: 2009-10-09
Accepted: 2010-01-16
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Corresponding Authors:
WU Bing-fang
E-mail: wubf@irsa.ac.cn
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