Analysis on coral reefs mapping using SPOT5 at Dongsha Atoll

CHEN Jian-yu; MAO Zhi-hua; ZHANG Hua-guo; WU Jun-ping; CHEN Xiao-dong; PAN De-lu

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CHEN Jian-yu, MAO Zhi-hua, ZHANG Hua-guo, WU Jun-ping, CHEN Xiao-dong, PAN De-lu. Analysis on coral reefs mapping using SPOT5 at Dongsha Atoll[J]. Haiyang Xuebao, 2007, 29(3): 51-57.

Citation:

CHEN Jian-yu, MAO Zhi-hua, ZHANG Hua-guo, WU Jun-ping, CHEN Xiao-dong, PAN De-lu. Analysis on coral reefs mapping using SPOT5 at Dongsha Atoll[J]. Haiyang Xuebao, 2007, 29(3): 51-57.

CHEN Jian-yu, MAO Zhi-hua, ZHANG Hua-guo, WU Jun-ping, CHEN Xiao-dong, PAN De-lu. Analysis on coral reefs mapping using SPOT5 at Dongsha Atoll[J]. Haiyang Xuebao, 2007, 29(3): 51-57.

Citation:

CHEN Jian-yu, MAO Zhi-hua, ZHANG Hua-guo, WU Jun-ping, CHEN Xiao-dong, PAN De-lu. Analysis on coral reefs mapping using SPOT5 at Dongsha Atoll[J]. Haiyang Xuebao, 2007, 29(3): 51-57.

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Analysis on coral reefs mapping using SPOT5 at Dongsha Atoll

State Key Laboratory of Satellite Environment Dynamics, Second Institute of Oceanography, State Oceanic Administration, Hangzhou 310012, China

Received Date: 2006-06-27
Rev Recd Date: 2006-10-16

Abstract

Abstract

Coral reefs are an environment-sensitive complex marine ecosystem.The ecosystem of corals is rich in biodiversity.Remote sensing offers a powerful tool for categorizing coral reefs and is the most effective approach for large-scale reef surveys.The Dongsha Atoll is located on the northern continental margin of the South China Sea.The area of the atoll is more than 300 km² with an average depth of 10 m,and has being abused by destructive fishing during recent decades.the capabilities of SPOT5 imagery are evaluated to provide data that are useful for categorizing the current distribution of corals in the Dongsha Atoll.Three satellite imageries (Quickbird2,ETM+,and SPOT5) are used to survey this area.In data processing,unsupervised classification functions are adopted for ETM+ and SPOT5 data,and a supervised classification method is used for Quickbird2.The classes are (or not) merged into coral reef,and then will be operated by vectorization,simplification,and to pological analysis.There are 1331 coral reefs larger than 100 m² with the detection limitation of 3×3 pixels at multi-band data of Quickbird2.This is taken as the comparison-baseline.The results extracted from SPOT5 and ETM images are less in number and area than from Quickbird2 image.And the results from SPOT5 data are better than those of ETM data at silty lagoon due to its higher resolution.SPOT XS Band2 is failed to show the deep substrate inside the atoll comparing with ETM data because of its penetration capability.Only SPOTXS Band 1 cannot differentiate coral reef from sand bottom.Merging the spectral qualities of SPOT5 multi-bands data with the spatial resolution of SPOT5 Pan data and referring to ETM imagery are expected to provide an optimum satellite-based approach to habitat mapping.
- coral reefs,
- Dongsha Atoll,
- SPOT5,
- Quickbird,

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References(29)

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