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MODIS data
based NDVI Seasonal dynamics in agro-ecosystems of south
bank Hangzhouwan bay
Zhao Hanbing1, Yang
Xiaoping2* and Li Jialin2
1College
of Information, South China Agricultural University,
Guangzhou 510642, Guangdong, China.
2Coastal
Resources and Environment Research Center, Ningbo
University, Ningbo 315211, China.
Accepted 9 August, 2011 |
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Normalized difference vegetation index (NDVI) is an
important index characterizing the growth dynamics of
plants. During the growth process of plants, NDVI value
gradually increases, reaching its maximum at a certain stage
of its growth period and then gradually dwindle. The
variation curve of NDVI varies for different plants. Due to
its high time resolution, Moderate Resolution Imaging
Spectrometer–Normalized difference vegetation index (MODIS-NDVI)
data can be applied to the study on the NDVI’s variation of
agro-ecosystem. The analysis on the NDVI’s variation
characteristics in different cropping systems of the
agro-ecosystem of
south bank Hangzhouwan Bay (Southeast Shanghai, China
with north latitude of 30°02′ to 30°24′ and east longitude
of 121°02′ to 121°42′) was conducted by employing the field
investigation data and remote sensing data of 23 time
sequences synthesized by MODIS-NDVI 16d in 2002. The results
indicate that NDVI curves of different cropping systems are
characterized by specific variation law. NDVI feature model
extracted from different cropping systems based on
MODIS-NDVI data can be used for the analysis of the cropping
system of the agro-ecosystem, providing basic data for
remote sensing yield estimation.
Key words:
MODIS – NDVI,
agro-ecosystem, cropping system, seasonal dynamics. |
