Temporal influences on satellite retrieval of cyanobacteria bloom: an examination in Lake Taihu, China

Yue Zhang; Yuanbo Liu; Renzong Ruan; Dongbo Zhao

doi:10.1117/12.833204

30 October 2009 Temporal influences on satellite retrieval of cyanobacteria bloom: an examination in Lake Taihu, China

Yue Zhang, Yuanbo Liu, Renzong Ruan, Dongbo Zhao

Proceedings Volume 7494, MIPPR 2009: Multispectral Image Acquisition and Processing; 74942G (2009) https://doi.org/10.1117/12.833204
Event: Sixth International Symposium on Multispectral Image Processing and Pattern Recognition, 2009, Yichang, China

Abstract

Satellite imagery provides a cost-effective way to retrieve the cyanbacteria bloom dynamics, which is useful to early warning of the blooms. However, temporal variations in sun-target-satellite geometry and atmosphere may generate inconsistencies in multi-temporal images. To explore to what extent temporal influences could affect the retrieved results, we applied the single band and the band ratio approaches to retrieve cyanobacteria bloom in Lake Taihu of China. We used the Moderate Resolution Imaging Spectroradiometer (MODIS) products in the cases with and without correction for sun-target-satellite geometry and atmospheric effects for the whole year 2006. In addition, we made use of MODIS data including aerosol optical thickness (AOT), solar zenith angle and sensor zenith angle, all of which are indicators of the temporal influences. We then analyzed the relationships of retrieval differences with the three indicators to evaluate the temporal influences quantitatively. Our results showed that both AOT and solar zenith angle had a positive correlation with the retrieval of cyanobacteria bloom. Although it is yet under investigation if this relationship could hold on for other cases, here we emphasized that for reliable monitoring the dynamics of bloom, it should be careful to apply the approaches using satellite data without radiometric correction.

Citation Download Citation

Yue Zhang, Yuanbo Liu, Renzong Ruan, and Dongbo Zhao "Temporal influences on satellite retrieval of cyanobacteria bloom: an examination in Lake Taihu, China", Proc. SPIE 7494, MIPPR 2009: Multispectral Image Acquisition and Processing, 74942G (30 October 2009); https://doi.org/10.1117/12.833204

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