The Ocean and Land Colour Imager (OLCI) for the Sentinel 3 GMES Mission: status and first test results

Nieke, Jens; Borde, Franck; Mavrocordatos, C.; Berruti, B.; Delclaud, Yves; Riti, Jean Bernard; Garnier, Thierry

doi:10.1117/12.977247

Cited by 36 publications

(23 citation statements)

References 4 publications

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“…Among those Sentinel satellites are the Sentinel-3A and Sentinel-3B satellites [13], which were successfully launched on 16 February 2016 and 25 April 2018, respectively. On-board, two sensors are of interest for the monitoring of natural water bio-optical properties and surface temperature [13]: the Ocean and Land Colour Instrument (OLCI-A thereafter) [14] and the Sea and Land Surface Temperature Radiometer (SLSTR) [15].…”

Section: Introductionmentioning

confidence: 99%

“…OLCI is the successor of the Medium Resolution Spectrometer (MERIS). OLCI observes the Earth with a swath width of 1200 km and a spatial resolution of 300 m. The revisit time over sea is 3.8 days with one instrument and 1.9 days with two instruments [14]. OLCI has 21 spectral bands [13] compared to 15 for MERIS.…”

Section: Introductionmentioning

confidence: 99%

“…These six additional bands are centered at 400 and 674 nm (water constituents retrieval improvement), 761, 764, and 768 nm (O 2 gas absorption correction improvements), and 1020 nm (atmospheric correction improvement). OLCI cameras are tilted to mitigate the sun-glint contamination [14]. The OLCI and SLSTR fields of view are co-located, allowing potentially the improvement of atmospheric correction over optically-complex waters [16].…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Five Atmospheric Correction Algorithms over French Optically-Complex Waters for the Sentinel-3A OLCI Ocean Color Sensor

et al. 2019

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The Sentinel-3A satellite was launched on 16 February 2016 with the Ocean and Land Colour Instrument (OLCI-A) on-board for the study of ocean color. The accuracy of ocean color parameters depends on the atmospheric correction algorithm (AC). This processing consists of removing the contribution of the atmosphere from the total measured signal by the remote sensor at the top of the atmosphere. Five ACs: the baseline AC, the Case 2 regional coast color neural network AC, its alternative version, the Polymer AC, and the standard NASA AC, are inter-compared over two bio-optical contrasted French coastal waters. The retrieved water-leaving reflectances are compared with in situ ocean color radiometric measurements collected using an ASD FielSpec4 spectrometer. Statistical and spectral analysis were performed to assess the best-performing AC through individual (relative error (RE) at 412 nm ranging between 23.43 and 57.31%; root mean squared error (RMSE) at 412 nm ranging between 0.0077 and 0.0188) and common (RE(412 nm) = 24.15–50.07%; RMSE(412 nm) = 0.0081–0.0132) match-ups. The results suggest that the most efficient schemes are the alternative version of the Case 2 regional coast color neural network AC with RE(412 nm) = 33.52% and RMSE(412 nm) = 0.0101 for the individual and Polymer with RE(412 nm) = 24.15% and RMSE(412 nm) = 0.0081 for the common ACs match-ups. Sensitivity studies were performed to assess the limitations of the AC, and the errors of retrievals showed no trends when compared to the turbidity and CDOM.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evaluation of Five Atmospheric Correction Algorithms over French Optically-Complex Waters for the Sentinel-3A OLCI Ocean Color Sensor

et al. 2019

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“…Firstly, the Ocean and Land Colour Imager (OLCI) is a push-broom imaging spectrometer with five cameras (see e.g. Nieke et al, 2012). The joint swath with a total width of 1270 km has a westerly offset against the satellite nadir ground track of approximately 300 km to mitigate sun glint (see Fig.…”

Section: Sentinel-3 Payloadmentioning

confidence: 99%

Core operational Sentinel-3 marine data product services as part of the Copernicus Space Component

et al. 2016

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Abstract. This paper describes the marine data available from the Marine Centre, part of the Sentinel-3 Payload Data Ground Segment, located at the European Organisation for the Exploitation of Meteorological Satellites (EUMETSAT). The Marine Centre together with the existing EUMETSAT facilities provides a centralised operational service for operational oceanography. These descriptions of the marine data are produced with a focus on a user service perspective. They include the scientific and operational feedback mechanisms on the performance of the services as well as practical information and user support mechanisms.

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“…The FLuorescence EXplorer (FLEX) mission has been selected for the ESA Earth Explorer EE8 program [4]. FLEX will fly in tandem with Sentinel 3 mission, making use of data synergy with other visible reflectance (from OLCI, [5]) and surface temperature data (from SLSTR, [6,7]). The FLuORescence Imaging Spectrometer (FLORIS) is the FLEX payload.…”

Section: Introduction and Objectivesmentioning

confidence: 99%

Fluorescence Imaging Spectrometer (FLORIS) for ESA FLEX Mission

Coppo¹,

Taiti²,

Pettinato³

et al. 2017

Remote Sensing

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The Fluorescence Explorer (FLEX) mission has been selected as ESA's 8th Earth Explorer mission. The primary objectives of the mission are to provide global estimates of vegetation fluorescence, actual photosynthetic activity, and vegetation stress. FLEX will fly in tandem formation with Sentinel-3 providing ancillary data for atmospheric characterization and correction, vegetation related spectral indices, and land surface temperature. The purpose of this manuscript is to present its scientific payload, FLORIS, which is a push-broom hyperspectral imager, flying on a medium size platform. FLORIS will measure the vegetation fluorescence in the spectral range between 500 nm and 780 nm at medium spatial resolution (300 m) and over a swath of 150 km. It accommodates an imaging spectrometer with a very high spectral resolution (0.3 nm), to measure the fluorescence spectrum within two oxygen absorption bands (O 2A and O 2B ), and a second spectrometer with lower spectral resolution to derive additional atmospheric and vegetation parameters. A compact opto-mechanical solution is the current instrument baseline. A polarization scrambler is placed in front of a common dioptric telescope serving both spectrometers to minimize the polarization sensitivity. The telescope images the ground scene onto a double slit assembly. The radiation is spectrally dispersed onto the focal planes of the grating spectrometers. Special attention has been given to the mitigation of stray-light which is a key factor to reach good accuracy of the fluorescence measurement. The absolute radiometric calibration is achieved by observing a dedicated Sun illuminated Lambertian diffuser, while the spectral calibration in flight is performed by means of vicarious techniques. The thermal stabilization is achieved by using two passive radiators looking directly to the cold space, counterbalanced by heaters in a closed loop system. The focal planes are based on custom developed CCDs. The opto-mechanical design is robust, stable vs. temperature and easy to align. The optical quality is very good as recently demonstrated by the latest tests of an elegant breadboard. The scientific data products comprise the Top Of Atmosphere (TOA) radiance measurements as well as fluorescence estimates and higher-level products related to the health status of the vegetation addressing a wide range of applications from agriculture to forestry and climate.

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The Ocean and Land Colour Imager (OLCI) for the Sentinel 3 GMES Mission: status and first test results

Cited by 36 publications

References 4 publications

Evaluation of Five Atmospheric Correction Algorithms over French Optically-Complex Waters for the Sentinel-3A OLCI Ocean Color Sensor

Evaluation of Five Atmospheric Correction Algorithms over French Optically-Complex Waters for the Sentinel-3A OLCI Ocean Color Sensor

Core operational Sentinel-3 marine data product services as part of the Copernicus Space Component

Fluorescence Imaging Spectrometer (FLORIS) for ESA FLEX Mission

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