Monitoring Coral Reefs from Space

Eakin, C. Mark; Nim, C.; Brainard, Russell E.; Aubrecht, Christoph; Elvidge, C. D.; Gledhill, D. K.; Muller‐Karger, Frank E.; Mumby, Peter J.; Skirving, William; Strong, A. E.; Wang, Menghua; Weeks, Scarla J.; Wentz, F. J.; Ziskin, Daniel

doi:10.5670/oceanog.2010.10

Cited by 51 publications

(39 citation statements)

References 53 publications

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“…It is thus a valuable resource to monitor and detect changes in coastal areas with high vulnerability, such as lagoons and coral reefs [11]. The challenge however, is to obtain accurate estimation of the apparent (e.g., above-water remote sensing reflectance, R rs (λ)) and inherent (e.g., absorption and backscattering coefficients) optical properties in coastal environments with optically complex waters [12].…”

Section: Introductionmentioning

confidence: 99%

Bio-Optical Characterization and Ocean Colour Inversion in the Eastern Lagoon of New Caledonia, South Tropical Pacific

et al. 2018

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Abstract:The Eastern Lagoon of New Caledonia (ELNC) is a semi-enclosed system surrounded by an extensive coral reef barrier. The system has been suffering impacts from climate variability and anthropogenic activities, including mining exploitation. Satellite monitoring is thus an essential tool to detect such changes. The present study aimed to assess the bio-optical variability of the ELNC and examine the applicability of ocean colour algorithms, using in situ bio-optical and radiometric data, collected during the March 2014 CALIOPE 2 cruise. The chlorophyll a concentration (Chla) varied from 0.13-0.72 mg·m −3 , and the coastal stations were spectrally dominated by non-algal particles (NAP) and coloured dissolved organic matter (CDOM) (>80% of the total non-water absorption at 443 nm), due to the contribution of allochthonous sources. The phytoplankton specific absorption was generally lower (mean, 0.049 m 2 ·mg Chla −1 ) than typical values observed for the corresponding Chla range, as well as the spectral slopes of the absorption of CDOM plus NAP (a dg ) (mean, 0.016 nm −1 ) and of the particle backscattering coefficient (b bp ) (mean, 0.07 nm −1 ). The remote sensing reflectance obtained using two in-water approaches and modelled from Inherent Optical Properties (IOPs) showed less than 20% relative percent differences (RPD). Chla estimates were highly biased for the empirical (OC4 and OC3) and semi-analytical (GSM, QAA, GIOP, LMI) algorithms, especially at the coastal stations. Excluding these stations, the GSM01 yielded the best retrievals with 35-40% RPD. a dg (443) was well retrieved by all algorithms with~18% RPD, and b bp (443) with~40% RPD. Turbidity algorithms also performed reasonably well (30% RPD), showing the capacity and usefulness of the derived products to monitor the water quality of the ELNC, provided accurate atmospheric correction of the satellite data. Regionally tuned algorithms may potentially improve the Chla retrievals, but better parameterization schemes that consider the spatiotemporal variability of the specific IOPs are still needed.

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Section: Introductionmentioning

confidence: 99%

Bio-Optical Characterization and Ocean Colour Inversion in the Eastern Lagoon of New Caledonia, South Tropical Pacific

et al. 2018

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“…Satelit penginderaan jauh memiliki kapasitas untuk meningkatkan pemahaman tentang habitat terumbu karang melalui penyediaan informasi yang secara spasial dan runtun waktu sangat relevan dengan upaya pengelolaan dan secara praktis tidak dapat diperoleh dari pengamatan insitu semata (Eakin, et al 2010).…”

Section: Pendahuluanunclassified

Zonasi Geomorfologi Dan Koreksi Kolom Air Untuk Pemetaan Substrat Dasar Menggunakan Citra Quickbird

Selamat

Jaya

Siregar

et al. 2017

JTPK

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ABSTRAKSalah satu kelemahan metode koreksi kolom air adalah dapat memunculkan bias dalam estimasi rasio koefisien atenuasi. Bias ini berkontribusi pada nilai akurasi tematik peta substrat dasar. Studi ini menggunakan pendekatan zonasi geomorfologi untuk meningkatkan akurasi tematik peta substrat yang dihasilkan dari metode koreksi kolom air. Nilai piksel citra Quickbird dikonversi ke radiansi dan dilanjutkan dengan koreksi kolom air untuk menghasilkan peta substrat dasar dengan tiga tema: substrat dominan pasir, lamun dan karang. Data lapangan dikelompokkan menggunakan metode Bray curtis dan menjadi dasar bagi reklasifikasi. Profil geomorfologi dicitra disadap dari gabungan kanal hijau dan merah, mengacu pada hasil survei batimetri. Akurasi tematik metode kombinasi ini dapat mencapai lebih dari 80%.

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“…Satellite sensors cover large geographic areas and have good temporal coverage in most areas of interest (Dekker et al, 2001). This can enhance the understanding of coral reef ecosystems and their threats, by providing spatio-temporal data on reef ecosystems and the environmental conditions influencing them (Eakin et al, 2010). NASA has developed a baseline of global reef maps that can be a foundation for future more detailed scientific investigation (NASA, 2011a).…”

Section: Review Of Previous Methodsmentioning

confidence: 99%

“…Remote sensing technology, such as airborne and satellite sensors, can potentially provide more accurate classification of coral reef ecosystem, in a shorter period of time and in a more cost effective manner than via in situ surveys (Eakin et al, 2010). Airborne hyperspectral sensors have been used to uniquely identify and map coral reef ecosystems (Clark et al, 1997;Mumby et al, 1998).…”

Section: Review Of Previous Methodsmentioning

confidence: 99%

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Image Fusion Applied to Satellite Imagery for the Improved Mapping and Monitoring of Coral Reefs: A Proposal

Gholoum

Bruce

Hazeam

2012

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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A coral reef ecosystem, one of the most complex marine environmental systems on the planet, is defined as biologically diverse and immense. It plays an important role in maintaining a vast biological diversity for future generations and functions as an essential spawning, nursery, breeding and feeding ground for many kinds of marine species. In addition, coral reef ecosystems provide valuable benefits such as fisheries, ecological goods and services and recreational activities to many communities. However, this valuable resource is highly threatened by a number of environmental changes and anthropogenic impacts that can lead to reduced coral growth and production, mass coral mortality and loss of coral diversity. With the growth of these threats on coral reef ecosystems, there is a strong management need for mapping and monitoring of coral reef ecosystems. Remote sensing technology can be a valuable tool for mapping and monitoring of these ecosystems. However, the diversity and complexity of coral reef ecosystems, the resolution capabilities of satellite sensors and the low reflectivity of shallow water increases the difficulties to identify and classify its features. This paper reviews the methods used in mapping and monitoring coral reef ecosystems. In addition, this paper proposes improved methods for mapping and monitoring coral reef ecosystems based on image fusion techniques. This image fusion techniques will be applied to satellite images exhibiting high spatial and low to medium spectral resolution with images exhibiting low spatial and high spectral resolution. Furthermore, a new method will be developed to fuse hyperspectral imagery with multispectral imagery. The fused image will have a large number of spectral bands and it will have all pairs of corresponding spatial objects. This will potentially help to accurately classify the image data. Accuracy assessment use ground truth will be performed for the selected methods to determine the quality of the information derived from image classification. The research will be applied to the Kuwait's southern coral reefs: Kubbar and Um Al-Maradim.

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Monitoring Coral Reefs from Space

Cited by 51 publications

References 53 publications

Bio-Optical Characterization and Ocean Colour Inversion in the Eastern Lagoon of New Caledonia, South Tropical Pacific

Bio-Optical Characterization and Ocean Colour Inversion in the Eastern Lagoon of New Caledonia, South Tropical Pacific

Zonasi Geomorfologi Dan Koreksi Kolom Air Untuk Pemetaan Substrat Dasar Menggunakan Citra Quickbird

Image Fusion Applied to Satellite Imagery for the Improved Mapping and Monitoring of Coral Reefs: A Proposal

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