A Preliminary Study on Benthic Mapping of Uljin Coast Based on Airborne Hyperspectral Imagery Towards the Whitening Detection

Kim, Wonkook; Kim, Sung Hak; Baek, Seungil; Kim, Hyunkyum; Oh, Jeill

doi:10.2112/jcr-si114-094.1

Cited by 3 publications

(3 citation statements)

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“…Whitening may disturb the benthic ecosystem and result in a reduction of biological diversity, biomass, and habitats in the coastal ecosystem [1,41]. Although whitening seems to be related to artificial effects (eutrophication, climate change, etc.…”

Section: Environmental Implications For the Coastal Ecosystemmentioning

confidence: 99%

Effects of Irradiance and Temperature on the Photosynthesis of the Crustose Coralline Algae Pneophyllum fragile (Corallinales, Rhodophyta) in the Coastal Waters of Korea

Baek

Lee

Kim

et al. 2022

JMSE

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We investigated the photosynthetic characteristics of the crustose coralline alga Pneophyllum fragile (Corallinales, Rhodophyta) according to elevated water temperature and irradiance on the coast of Jeju in 2018. P. fragile was cultured under different temperature (11°C, 21°C, 26°C, and 31°C) and irradiance (0–1250 μmol photon m–2 s–1) conditions. Oxygen (O2) concentrations at the P. fragile mat–water interface (MWI) were measured using an O2 microsensor. At the MWI, the diffusive boundary layer thicknesses ranged from 200 to 400 μm. The O2 concentrations at the mat surface increased in response to increasing irradiance, and reached 344% air saturation. The maximum photosynthesis capacity (Pmax) and respiration rate in the dark (Rd) at 31°C were about 3 times higher than those recorded at 11 °C. The compensation irradiance (Ec) and saturation irradiance (Ek) increased with increasing water temperature. The Pmax, Rd, and Ec were statistically correlated with temperature (p < 0.05). The Ek increased up to 833 μmol photon m–2 s–1 at 31°C and exhibited a strong dependence on irradiance at high temperatures. The adaptability of P. fragile to high temperatures and strong irradiance was distinct from that observed for coralline algae in other temperate waters.

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Section: Environmental Implications For the Coastal Ecosystemmentioning

confidence: 99%

Effects of Irradiance and Temperature on the Photosynthesis of the Crustose Coralline Algae Pneophyllum fragile (Corallinales, Rhodophyta) in the Coastal Waters of Korea

Baek

Lee

Kim

et al. 2022

JMSE

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“…Therefore, whitening detection is necessary to better understand the degradation of the ecosystem and help the local government to develop mitigation measures. In a recent study, Kim et al [31] investigated the whitening of the Uljin coast via benthic mapping using CASI-1500 data, atmospherically corrected using FLAASH. However, the resulting CASI-1500 R rs data were not validated as no field measurements of R rs were available.…”

Section: Airborne Hyperspectral Datamentioning

confidence: 99%

“…Pre-processing of the CASI-1500 data included radiometric calibration, which converted digital number (DN) into spectral radiance unit (SRU, µw cm −2 sr −1 nm −1 ) with a scale factor of 1000, and geometric calibration using the GEOCORR program, which geo-referenced the data to UTM WGS84 [31]. Use of CASI-1500 also required use of inputs from MODIS-Aqua described in Section 2.2.…”

Section: Airborne Hyperspectral Datamentioning

confidence: 99%

Atmospheric Correction of Airborne Hyperspectral CASI Data Using Polymer, 6S and FLAASH

Yang

Tian

et al. 2021

Remote Sensing

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Airborne hyperspectral data play an important role in remote sensing of coastal waters. However, before their application, atmospheric correction is required to remove or reduce the atmospheric effects caused by molecular and aerosol scattering and absorption. In this study, we first processed airborne hyperspectral CASI-1500 data acquired on 4 May 2019 over the Uljin coast of Korea with Polymer and then compared the performance with the other two widely used atmospheric correction approaches, i.e., 6S and FLAASH, to determine the most appropriate correction technique for CASI-1500 data in coastal waters. Our results show the superiority of Polymer over 6S and FLAASH in deriving the Rrs spectral shape and magnitude. The performance of Polymer was further evaluated by comparing CASI-1500 Rrs data with those obtained from the MODIS-Aqua sensor on 3 May 2019 and processed using Polymer. The spectral shapes of the derived Rrs from CASI-1500 and MODIS-Aqua matched well, but the magnitude of CASI-1500 Rrs was approximately 0.8 times lower than MODIS Rrs. The possible reasons for this difference were time difference (1 day) between CASI-1500 and MODIS data, higher land adjacency effect for MODIS-Aqua than for CASI-1500, and possible errors in MODIS Rrs from Polymer.

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Mapping Benthic Substrate Type in a Shallow Coastal Area Using Airborne Hyperspectral Images

Kim

Kim²,

Baek

et al. 2021

2021 IEEE International Geoscience and Remote Sensing Symposium IGARSS

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A Preliminary Study on Benthic Mapping of Uljin Coast Based on Airborne Hyperspectral Imagery Towards the Whitening Detection

Cited by 3 publications

References 0 publications

Effects of Irradiance and Temperature on the Photosynthesis of the Crustose Coralline Algae Pneophyllum fragile (Corallinales, Rhodophyta) in the Coastal Waters of Korea

Effects of Irradiance and Temperature on the Photosynthesis of the Crustose Coralline Algae Pneophyllum fragile (Corallinales, Rhodophyta) in the Coastal Waters of Korea

Atmospheric Correction of Airborne Hyperspectral CASI Data Using Polymer, 6S and FLAASH

Mapping Benthic Substrate Type in a Shallow Coastal Area Using Airborne Hyperspectral Images

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