CORRECTIONS TO NOAA/AVHRR REFLECTANCE AND NDVI AND THEIR ERROR ANALYSIS

Wang Kaicun; Chen Changhe; Guo Ni

Vol.14, NO.2, 2003

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2003 > 14(2): 165-175

Wang Kaicun, Chen Changhe, Guo Ni. Corrections to NOAA/AVHRR reflectance and NDVI and their error analysis. J Appl Meteor Sci, 2003, 14(2): 165-175.

Citation:

Wang Kaicun, Chen Changhe, Guo Ni. Corrections to NOAA/AVHRR reflectance and NDVI and their error analysis. J Appl Meteor Sci, 2003, 14(2): 165-175.

Wang Kaicun, Chen Changhe, Guo Ni. Corrections to NOAA/AVHRR reflectance and NDVI and their error analysis. J Appl Meteor Sci, 2003, 14(2): 165-175.

Citation:

Wang Kaicun, Chen Changhe, Guo Ni. Corrections to NOAA/AVHRR reflectance and NDVI and their error analysis. J Appl Meteor Sci, 2003, 14(2): 165-175.

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CORRECTIONS TO NOAA/AVHRR REFLECTANCE AND NDVI AND THEIR ERROR ANALYSIS

1.
Atmospheric Department, Physics College, Peking University, Beijing 100871
2.
Atmospheric Department, Resource and Env ironment College, Lanzhou University, Lanzhou 730000
3.
Institute of Arid Meteorology, CMA, Lanzhou, 730020

Received Date: 2001-12-30
Rev Recd Date: 2002-07-15
Publish Date: 2003-04-30

Abstract

Abstract

NOAA/AVHRR reflectance and normalized difference vegetation index (NDVI) data have been widely used in meteorological and hydrological fields.Because the bi-directional reflectance distribution of surface and the scatter and absorption effects of atmosphere, even though the surface keeps unchanged, the reflectance obtained by satellites can vary greatly.After cloud-removing and degradation-correcting processing, atmospheric corrections are carried out to NOAA/AVHRR visible and near-inf rared reflectance and NDVI data using the 6S model, and then bi-directional reflectance corrections are carried out.The atmospheric correction makes the visible reflectanc decrease by 3.34 (reflectance unit), the near infrared reflectance increase by 3.43 (reflectance unit), and increases the NDVI increase by 0.22, equaling to 78.2 percent, 15.9 percent and 35.5 percent of theirown respectively.The bi-directional reflectance correction does not affect the amount of NDVI distinctively, but can remove the irregular variances of the reflectance and NDVI.After corrections, the reflectance and NDVI can reflect the phenological effect of deciduous forests (the land cover of the surface target).At last, based on the error analysis, the sensitivities of correction errors to the errors of correction parameters are given, and the results show that the solar and satellite zenith angles are the most sensitive parameters.
- Reflectance;
- NDVI;
- Atmospheric correction;
- Bi-directional reflectance correction;
- Error analysis

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References(17)

Figures and Tables

图 1 大气订正前后对比

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图 2 利用Roujean模式进行双向反射订正

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图 3 利用Rahman模式进行双向反射订正

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表 1 订正参数

表 2 大气各成分的平均订正差值

表 3 4参数Rahman模式拟合的结果

表 4 大气订正误差的敏感度

表 5 双向反射订正误差的敏感度

References

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