Robust approach to directly measuring water-leaving radiance in the field

Lee, Zhongping; Pahlevan, Nima; Ahn, Yu-Hwan; Greb, Steven R.; O’Donnell, David M.

doi:10.1364/ao.52.001693

Cited by 85 publications

(61 citation statements)

References 36 publications

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“…During the NASA geostationary coastal and air pollution events (GEOCAPE) survey on September 2013 in the northern Gulf of Mexico, stations were collected in coastal waters during VIIRS orbital overlaps using a Satlantic's hyperspectral optical profiler (hyperpro, station B) and floating skylight-blocking approach 30,39 (station A) to determine the R rs and inherent optical properties (absorption and backscattering). The hyperpro measurements were processed using protocols in Ondrusek et al 40 VIIRS center pixel at the stations was used for the matchup.…”

Section: Cruise Data and Visual Infrared Imaging Radiometer Suite Matmentioning

confidence: 99%

Diurnal changes in ocean color sensed in satellite imagery

Arnone

Vandermeulen

Soto

et al. 2017

J. Appl. Remote Sens

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Abstract. Measurements of diurnal changes in ocean color in turbid coastal regions in the Gulf of Mexico were characterized using above water spectral radiometry from a National Aeronautics and Space Administration (aerosol robotic network-WaveCIS CSI-06) site that can provide 8 to 10 observations per day. Satellite capability to detect diurnal changes in ocean color was characterized using hourly overlapping afternoon orbits of the visual infrared imaging radiometer suite (VIIRS) Suomi National Polar-orbiting Partnership ocean color sensor and validated with in situ observations. The monthly cycle of diurnal changes was investigated for different water masses using VIIRS overlaps. Results showed the capability of satellite observations to monitor hourly color changes in coastal regions that can be impacted by vertical movement of optical layers, in response to tides, resuspension, and river plume dispersion. The spatial variability of VIIRS diurnal changes showed the occurrence and displacement of phytoplankton blooming and decaying processes. The diurnal change in ocean color was above 20%, which represents a 30% change in chlorophyll-a. Seasonal changes in diurnal ocean color for different water masses suggest differences in summer and winter responses to surface processes. The diurnal changes observed using satellite ocean color can be used to define the following: surface processes associated with biological activity, vertical changes in optical depth, and advection of water masses. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Section: Cruise Data and Visual Infrared Imaging Radiometer Suite Matmentioning

confidence: 99%

Diurnal changes in ocean color sensed in satellite imagery

Arnone

Vandermeulen

Soto

et al. 2017

J. Appl. Remote Sens

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“…Although, it is not the scope of this review, there are other methods that can be used in determining remote sensing near the sea surface, minimizing surface reflected glint, (i) measuring just below the sea surface using the novel hyperspectral skylight-blocked approach -HyperSBA [36] -this approach of measuring water leaving radiance just below the sea surface and also above-water to determine sea surface glint in optically complex coastal and inland waters was evaluated in a new glint removal method [37]. In this approach, L T /E D or upwelling radiance/irradiance spectra for the intervals (350 -380) nm and (890 -900) nm is used as reference reflectance.…”

Section: Evaluation Of the Approachesmentioning

confidence: 99%

“…tual fact absolute removal of surface reflected glint is difficult [14,19,36], as evaluated in Table 3. Furthermore, no glint correction approach has been unequivocally brought forward and thus to date surface reflected glint correction depends on the researcher [19].…”

Section: -6mentioning

confidence: 99%

“…In addition, taking into account the different geometry setups that have been widely used (Table 1), sea and meteorological conditions are beyond human control. The best ocean color studies can do is estimate water leaving radiance or reflectance with some degree of uncertainties [36]. The literature we look at in this report does not cover all available approaches but rather we provide a general list of widely used approaches and we are bound to have skipped some important literature.…”

Section: -6mentioning

confidence: 99%

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Methods in reducing surface reflected glint for shipborne above-water remote sensing

Garaba

2013

J. Eur. Opt. Soc.-Rapid Publ.

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Surface reflected glint is a curse for ocean color remote sensing from above-water platforms. In calibrated above-water shipborne radiometry, there are several surface reflected glint correction approaches widely implemented. These approaches were developed using radiative transfer simulations and/or field measurements in different water types, sea states, and cloud conditions. To date no particular surface reflected glint correction approach has been prescribed in ocean optics standard protocols. Without synoptic inherent optical properties to accurately determine apparent optical properties, glint correction is therefore rather qualitative or subjective. There is need to fully take inventory of uncertainties resulting from such differences. We look at different methods that have been implemented in calibrated shipborne radiometry and how surface reflected glint is corrected for using these available approaches. Field measurements are utilized to assess how the correction approaches perform under clear and overcast skies, we also elucidate on aspects for further improvements.

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“…The radiometric data (downwelling and upwelling light) were collected using the Hyper-OCR radiometers (Satlantic Corp). The radiometer measuring the upwelling radiance (above water) is augmented with a dark-painted cone made of acrylic to block the skyreflected light (Lee et al 2013). The inherent optical properties (IOPs) of water and the radiometric measurements were made at three stations across Boston Harbour.…”

Section: In Situ Data Collectionmentioning

confidence: 99%

Calibration/Validation of Landsat-Derived Ocean Colour Products in Boston Harbour

Pahlevan¹,

Sheldon²,

Peri³

et al. 2016

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

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ABSTRACT:The Landsat data archive provides a unique opportunity to investigate the long-term evolution of coastal ecosystems at fine spatial scales that cannot be resolved by ocean colour (OC) satellite sensors. Recognizing Landsat's limitations in applications over coastal waters, we have launched a series of field campaigns in Boston Harbor and Massachusetts Bay (MA, USA) to validate OC products derived from Landsat-8. We will provide a preliminary demonstration on the calibration/validation of the existing OC algorithms (atmospheric correction and in-water optical properties) to enhance monitoring efforts in Boston Harbor. To do so, Landsat optical images were first compared against ocean colour products over high-latitude regions. The in situ cruise data, including optical data (remote sensing reflectance) and water samples were analyzed to obtain insights into the optical and biogeochemical properties of near-surface waters. Along with the cruise data, three buoys were deployed in three locations across the Harbor to complement our database of concentrations of chlorophyll a, total suspended solids (TSS), and absorption of colour dissolved organic matter (CDOM). The data collected during the first year of the project are used to develop and/or tune OC algorithms. The data will be combined with historic field data to map in-water constituents back to the early 1990's. This paper presents preliminary analysis of some of the data collected under Landsat-8 overpasses.

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Robust approach to directly measuring water-leaving radiance in the field

Cited by 85 publications

References 36 publications

Diurnal changes in ocean color sensed in satellite imagery

Diurnal changes in ocean color sensed in satellite imagery

Methods in reducing surface reflected glint for shipborne above-water remote sensing

Calibration/Validation of Landsat-Derived Ocean Colour Products in Boston Harbour

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