UNMIXINGMETHOD APPLIED TO NOAA-AVHRR DATA FOR SNOW COVER ESTIMATION

Yan Hao; Zhang Guoping

Vol.15, NO.6, 2004

Article Contents

Article Navigation > Journal of Applied Meteorological Science > 2004 > 15(6): 665-671

Yan Hao, Zhang Guoping. Unmixing method applied to NOAA-AVHRR data for snow cover estimation. J Appl Meteor Sci, 2004, 15(6): 665-671.

Citation:

Yan Hao, Zhang Guoping. Unmixing method applied to NOAA-AVHRR data for snow cover estimation. J Appl Meteor Sci, 2004, 15(6): 665-671.

Yan Hao, Zhang Guoping. Unmixing method applied to NOAA-AVHRR data for snow cover estimation. J Appl Meteor Sci, 2004, 15(6): 665-671.

Citation:

Yan Hao, Zhang Guoping. Unmixing method applied to NOAA-AVHRR data for snow cover estimation. J Appl Meteor Sci, 2004, 15(6): 665-671.

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UNMIXINGMETHOD APPLIED TO NOAA-AVHRR DATA FOR SNOW COVER ESTIMATION

National Meteorological Center, CMA, Beijing 100081

Received Date: 2003-04-02
Rev Recd Date: 2004-03-23
Publish Date: 2004-12-31

Abstract

Abstract

Based on the spectral analysis of snow, soil, vegetation and cloud, it is pointed out that the first two channels of traditional NOAA-AVHRR have troubles to distinguish snow from cloud, and the low reflectance of snow in 1.6 μm infrared channel can be used not only to distinguish snow from cloud but also to supply more spectral information to extract snow cover. So the principal components analysis (PCA) was made to AVHRR data, and it was found that the PCA-transformed first two principal components (PCA1, PCA2) contributes about 99% cumulative variance. And the scatter plot to these components was analyzed and the endmembers were given. Also, two different methods were adopted to extract snow cover by using spectral linear mixing model, and results are highly consistent, which indicate that the unmixing method is an effective way to retrieve snow cover parameter.
- NOAA-AVHRR;
- Snow cover;
- Spectral linear mixing model;
- Snowpack parameters

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References(10)

Figures and Tables

图 1 地物光谱

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图 2 土地覆盖类型背景图

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图 3 前两个主分量 (PCA1和PCA2) 的散点图

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图 4 三个终元的特征光谱

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图 5 积雪盖度

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图 6 基于地物分类的积雪盖度

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图 7 积雪盖度剖面图

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表 1 AVHRR的通道特征

References

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