Prof. Alexander Gilerson Profile

Prof. Alexander Gilerson

Professor at City College of New York

SPIE Involvement:

Conference Program Committee | Author

Publications (69)

Proceedings Article | 12 June 2023 Presentation + Paper

Polarimetric imaging of the ocean surface for the study of ocean surface roughness and wave slopes statistics

Mateusz Malinowski, Alexander Gilerson, Eder Herrera-Estrella, Jacopo Agagliate

Proceedings Volume 12543, 125430M (2023) https://doi.org/10.1117/12.2665834

KEYWORDS: Polarization, Cameras, Polarimetry, Optical filters, Wind speed, Reflection, Atmospheric corrections, Imaging systems

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Proceedings Article | 3 June 2022 Presentation + Paper

Polarimetric imaging of the ocean surface for satellite-based ocean color applications

Jacopo Agagliate, Mateusz Malinowski, Eder Herrera, Alexander Gilerson

Proceedings Volume 12112, 121120I (2022) https://doi.org/10.1117/12.2622484

KEYWORDS: Polarization, Cameras, Neural networks, Atmospheric modeling, Ocean optics, Aerosols, Polarimetry, Sensors

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SPIE Journal Paper | 25 June 2021 Open Access

Spectral decomposition of remote sensing reflectance variance due to the spatial variability from ocean color and high-resolution satellite sensors

Eder Herrera Estrella, Alexander Gilerson, Robert Foster, Philipp Groetsch

JARS, Vol. 15, Issue 02, 024522, (June 2021) https://doi.org/10.1117/12.10.1117/1.JRS.15.024522

KEYWORDS: Reflectivity, Remote sensing, Aerosols, Water, Sensors, Spatial resolution, Earth observing sensors, Satellites, Atmospheric modeling, Atmospheric corrections

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Proceedings Article | 12 April 2021 Paper

Estimation of chlorophyll-a concentration in complex coastal waters from satellite imagery

Alexander Gilerson, Mateusz Malinowski, Eder Herrera, Michelle Tomlinson, Richard Stumpf, Michael Ondrusek

Proceedings Volume 11752, 117520B (2021) https://doi.org/10.1117/12.2588004

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Proceedings Article | 20 September 2020 Presentation + Paper

Uncertainties in remote sensing reflectance at various spatial scales

Alex Gilerson, Eder Herrera Estrella, Philipp Groetsch, Robert Foster, Mateusz Malinowski

Proceedings Volume 11529, 1152905 (2020) https://doi.org/10.1117/12.2574328

KEYWORDS: Reflectivity, Remote sensing, Sensors, Spatial resolution, Satellites, Atmospheric propagation, Optical properties, Sun, Light wave propagation, Radiative transfer

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Proceedings Article | 13 May 2020 Paper

Blue band reflectance uncertainties in coastal waters and their impact on retrieval algorithms

Eder Herrera Estrella, Philipp Grotsch, Alex Gilerson, Mateusz Malinowski, Sam Ahmed

Proceedings Volume 11420, 1142006 (2020) https://doi.org/10.1117/12.2559895

KEYWORDS: Satellites, Reflectivity, Water, Sensors, Remote sensing, Spatial resolution, Ocean optics, MODIS, Aerosols, Earth observing sensors

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Proceedings Article | 18 October 2019 Presentation

Satellite neural network ocean color retrievals of harmful algal blooms highlight advantages of avoiding deep blue bands (Conference Presentation)

Samir Ahmed, Ahmed El-Habashi, Claudia Duran, Alex Gilerson, Vincent Lovko, Michael Ondrusek, Stefanos Spiratos

Proceedings Volume 11150, 1115003 (2019) https://doi.org/10.1117/12.2531860

KEYWORDS: Satellites, In situ metrology, Neural networks, Atmospheric corrections, Optical simulations, Optical properties, Visible radiation, Infrared imaging, Radiometry, Remote sensing

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Our previous work showed the efficacy neural network (NN) approaches for satellite detection of Karenia brevis (KB) harmful algal blooms (HABs) in the West Florida Shelf (WFS). Applying a multiband NN, trained on a wide range of synthetically simulated inherent optical properties (IOPs), the NN takes Visible Infrared Imaging Radiometer Suite (VIIRS) remote sensing reflectance (Rrs) measurements at 486, 551 and 671 nm bands as inputs and produces related IOPs at 443 nm, including the absorption coefficient of phytoplankton, (aph443) as retrieved output images. We convert the retrieved aph443 values into equivalent chlorophyll-a [Chla] and KB HAB concentration mages, using known empirical relationships. We then compared VIIRS NN retrievals of KB HABs in the WFS with those obtained using other algorithms, and evaluated their accuracy against near co-incident in situ cell count measurements available over the 2012-16 period. Results highlighted the important impact of rapid (15-20 minutes) temporal variations on retrieval accuracy, and showed that the NN technique exhibited the highest accuracy statistics for retrievals of KB HABs in the WFS. This paper presents significant results in three areas. (i) We extend evaluations and comparisons of NN retrievals of aph443 and [Chla] with retrievals from other ocean color (OC) algorithms to waters beyond the WFS, including both complex coastal and open ocean waters, along Florida and Atlantic coasts, with a large dynamic range of chlorophyll-a values. We also now add in situ radiometric measurements to obtain Rrs inputs to retrieval algorithms. In contrast to satellite Rrs retrievals, these are invulnerable to atmospheric transmission correction errors. This permits comparison of in situ radiometric measurement-based retrievals with simultaneous co-located satellite retrievals and validation against in situ sample measurements. This allows us to isolate different factors affecting retrieval accuracy and evaluate the intrinsic merits of different algorithms unencumbered by inadequate/erroneous atmospheric transmission assumptions and/or satellite instrumental calibration limitations. Results obtained extend and demonstrate the efficacy of NN algorithms to widely varying waters beyond the WFS, (ii) Since it is conjectured that in satellite retrievals, it is the deep blue wavelengths that are more detrimentally affected by atmospheric correction inadequacies, we examined impacts on algorithm retrieval accuracy when deep blue wavelengths are used for retrieving Rrs values. Retrievals using NN and OCI/OCx algorithms were compared against in situ sample measurements, using in situ radiometric Rrs measurements and satellite Rrs retrievals as inputs, first at 443 nm (deep blue) and then at 486 nm (non-deep blue). The results unambiguously show that satellite retrieval accuracy, as well as intrinsic retrieval accuracy from in situ radiometric measurements are improved when deep blue wavelengths (443 nm) are avoided in favor of non-deep blue wavelengths (486 nm), raising issues of both atmospheric correction as well as possible underwater spectral interference in CDOM rich and complex waters. Thereby arguing for use of OC algorithms using the longer wavelengths. (iii) Finally, new quantitative analysis of temporal, intra pixel and sample depth variability highlights their important impact on retrieval accuracy.

Proceedings Article | 14 October 2019 Presentation + Paper

Multi- and hyperspectral polarimetric imaging of the ocean surface

Alex Gilerson, Carlos Carrizo, Mateusz Malinowski, Philipp Groetsch, Robert Foster, Eder Herrera Estrella

Proceedings Volume 11150, 1115007 (2019) https://doi.org/10.1117/12.2534055

KEYWORDS: Polarization, Imaging systems, Cameras, Polarimetry, Hyperspectral imaging, Optical filters, Calibration, Water, Video, Reflectivity

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Proceedings Article | 10 May 2019 Presentation + Paper

Total and polarized radiance from the ocean surface from hyperspectral polarimetric imaging

Alex Gilerson, Carlos Carrizo, Robert Foster, Tristan Harmel, Andrii Golovin, Ahmed El-Habashi, Eder Herrera, Trevor Wright

Proceedings Volume 11014, 110140F (2019) https://doi.org/10.1117/12.2521143

KEYWORDS: Imaging systems, Polarization, Polarimetry, Water, Aerosols, Scattering, Polarizers, Atmospheric particles, Hyperspectral imaging, Ocean optics

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Proceedings Article | 25 May 2018 Presentation + Paper

Ocean surface characterization using snapshot hyperspectral polarimetric imager

Carlos Carrizo, Andrii Golovin, Ahmed El-Habashi, Robert Foster, Deric Gray, Jeff Bowles, Alexander Gilerson

Proceedings Volume 10631, 1063107 (2018) https://doi.org/10.1117/12.2309585

KEYWORDS: Imaging systems, Hyperspectral imaging, Polarization, Water, Cameras, Hyperspectral simulation, Polarimetry, Ocean optics, Scattering, Polarizers

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Proceedings Article | 25 May 2018 Presentation + Paper

Comparison of aerosol models from the Ocean Color satellite sensors and AERONET-OC and their impact on reflectance spectra in coastal waters

Alexander Gilerson, Eder Herrera, Yaron Klein, Robert Foster, Barry Gross, Robert Arnone, Sam Ahmed

Proceedings Volume 10631, 1063106 (2018) https://doi.org/10.1117/12.2309581

KEYWORDS: Aerosols, Satellites, Sensors, Reflectivity, MODIS, Atmospheric modeling, Atmospheric corrections, Water, Remote sensing, Data modeling

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Proceedings Article | 3 October 2017 Paper

Imaging of polarized target in underwater environment

Carlos Carrizo, Robert Foster, Ahmed El-Habashi, Deric Gray, Alex Gilerson

Proceedings Volume 10422, 104220F (2017) https://doi.org/10.1117/12.2279149

KEYWORDS: Polarization, Polarimetry, Water, Submerged target modeling, Underwater imaging, Video, Signal attenuation, Atmospheric modeling, Environmental sensing, Cameras

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Proceedings Article | 3 October 2017 Paper

Characterization of aerosol parameters over ocean from the Ocean Color satellite sensors and AERONET-OC data

Alex Gilerson, Eder Herrera, Yaron Klein, Robert Foster, Barry Gross, Robert Arnone, Sam Ahmed

Proceedings Volume 10422, 104220H (2017) https://doi.org/10.1117/12.2279150

KEYWORDS: Aerosols, Atmospheric modeling, Satellites, Atmospheric corrections, Reflectivity, Sensors, Scattering, Atmospheric particles, Ocean optics, Data modeling

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Proceedings Article | 22 May 2017 Paper

Mueller matrices of hydrosols and their impact on the polarized light fields from the ocean water

Robert Foster, Anna McGilloway, Alex Gilerson

Proceedings Volume 10186, 101860N (2017) https://doi.org/10.1117/12.2266557

KEYWORDS: Radiative transfer, Polarimetry, Mueller matrices, Polarization, Remote sensing, Particles, Light scattering, Mie scattering

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Proceedings Article | 4 May 2016 Paper

Retrieval of the polarized submarine light field from above surface measurements using polarimetric imaging

Robert Foster, Anna McGilloway, Matteo Ottaviani, Carlos Carrizo, Alex Gilerson, Ahmed El-Habashi, Sam Ahmed

Proceedings Volume 9853, 98530O (2016) https://doi.org/10.1117/12.2225111

KEYWORDS: Polarization, Remote sensing, Polarimetry, Cameras, Water, Radiative transfer, Radiometry, Polarizers, Calibration, Sensors

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Proceedings Article | 14 October 2015 Paper

Multi-band algorithms for the estimation of chlorophyll concentration in the Chesapeake Bay

Alexander Gilerson, Michael Ondrusek, Maria Tzortziou, Robert Foster, Ahmed El-Habashi, Surya Prakash Tiwari, Sam Ahmed

Proceedings Volume 9638, 96380A (2015) https://doi.org/10.1117/12.2195725

KEYWORDS: Satellites, Algorithm development, MODIS, Absorption, Sensors, Remote sensing, Satellite imaging, Reflectivity, Earth observing sensors, Particles

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Proceedings Article | 1 September 2015 Paper

Characterization of sun and sky glint from wind ruffled sea surfaces for improved estimation of polarized remote sensing reflectance

Robert Foster, Amir Ibrahim, Alex Gilerson, Ahmed El-Habashi, Carlos Carrizo, Sam Ahmed

Proceedings Volume 9613, 96130W (2015) https://doi.org/10.1117/12.2190652

KEYWORDS: Monte Carlo methods, Sensors, Sun, Electroluminescent displays, Radiative transfer, Matrices, Radiometry, Polarization, Aerosols, Scattering

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Proceedings Article | 19 May 2015 Paper

Analysis of polarimetric image by full stokes vector imaging camera for retrieval of target polarization in underwater environment

Yalong Gu, Carlos Carrizo, Ahmed El-Habashi, Alexander Gilerson

Proceedings Volume 9459, 94590F (2015) https://doi.org/10.1117/12.2179500

KEYWORDS: Polarization, Cameras, Polarimetry, Light scattering, Monte Carlo methods, Polarizers, Underwater imaging, Scattering, Image analysis, Collimation

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Proceedings Article | 14 October 2014 Paper

Remote estimation of in water constituents in coastal waters using neural networks

Ioannis Ioannou, Alexander Gilerson, Michael Ondrusek, Soe Hlaing, Robert Foster, Ahmed El-Habashi, Kaveh Bastani, Samir Ahmed

Proceedings Volume 9240, 92400T (2014) https://doi.org/10.1117/12.2067772

KEYWORDS: Absorption, Water, Neural networks, Satellites, Algorithm development, Data modeling, Computer simulations, Backscatter, MODIS, Atmospheric corrections

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Remote estimations of oceanic constituents from optical reflectance spectra in coastal waters are challenging because of the complexity of the water composition as well as difficulties in estimation of water leaving radiance in several bands possibly due to inadequacy of current atmospheric correction schemes. This work focuses on development of a multiband inversion algorithm that combines remote sensing reflectance measurements at several wavelengths in the blue, green and red for retrievals of the absorption coefficients of phytoplankton, color dissolved organic matter and nonalgal particulates at 443nm as well as the particulate backscatter coefficient at 443nm. The algorithm was developed, using neural networks (NN), and was designed to use as input measurements on ocean color bands matching those of the Visible Infrared Imaging Radiometer Suite (VIIRS). The NN is trained on a simulated data set generated through a biooptical model for a broad range of typical coastal water parameters. The NN was evaluated using several statistical indicators, initially on the simulated data-set, as well as on field data from the NASA bio-Optical Marine Algorithm Data set, NOMAD, and data from our own field campaigns in the Chesapeake Bay which represent well the range of water optical properties as well as chlorophyll concentrations in coastal regions. The algorithm was also finally applied on a satellite - in situ databases that were assembled for the Chesapeake Bay region using MODIS and VIIRS satellite data. These databases were created using in-situ chlorophyll concentrations routinely measured in different locations throughout Chesapeake Bay and satellite reflectance overpass data that coexist in time with these in-situ measurements. NN application on this data-sets suggests that the blue (412 and 443nm) satellite bands are erroneous. The NN which was assessed for retrievals from VIIRS using only the 486, 551 and 671 bands showed that retrievals that omitted the 671 nm band was the most effective, possibly indicating an inaccuracy in the VIIRS 671 band that needs to be further investigated.

Proceedings Article | 14 October 2014 Paper

Retrieval of water optical properties using polarization of light underwater: case I and II waters

Alexander Gilerson, Amir Ibrahim, Robert Foster, Carlos Carrizo, Ahmed El-Habashi, Samir Ahmed

Proceedings Volume 9240, 92400R (2014) https://doi.org/10.1117/12.2067963

KEYWORDS: Scattering, Water, Absorption, Polarization, Sun, Signal attenuation, Particles, Ocean optics, Light scattering, Neodymium

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Proceedings Article | 23 May 2014 Paper

Underwater imaging of polarized targets

Alexander Gilerson, Yalong Gu, Carlos Carrizo, Amir Ibrahim, Ahmed El-Habashi, Robert Foster, Parrish Brady, Molly Cummings, Samir Ahmed

Proceedings Volume 9111, 91110N (2014) https://doi.org/10.1117/12.2053749

KEYWORDS: Point spread functions, Cameras, Light scattering, Polarization, Polarimetry, Mirrors, Imaging systems, Submerged target modeling, Monte Carlo methods, Scattering

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Proceedings Article | 23 May 2014 Paper

Algorithms for the remote estimation of chlorophyll-a in the Chesapeake Bay

I. Ioannou, A. Gilerson, M. Ondrusek, Robert Foster, Ahmed El-Habashi, K. Bastani, S. Ahmed

Proceedings Volume 9111, 911118 (2014) https://doi.org/10.1117/12.2053753

KEYWORDS: Near infrared, Algorithm development, Neural networks, Absorption, Evolutionary algorithms, Satellites, Sensors, Reflectivity, Data modeling, MODIS

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Proceedings Article | 21 May 2014 Paper

Polarization analysis of target imaging in an underwater environment

Yalong Gu, Alexander Gilerson, Carlos Carrizo, Amir Ibrahim, Samir Ahmed

Proceedings Volume 9099, 90990X (2014) https://doi.org/10.1117/12.2053750

KEYWORDS: Point spread functions, Light scattering, Cameras, Polarization, Scattering, Monte Carlo methods, Underwater imaging, Imaging systems, Submerged target modeling, Polarimetry

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Proceedings Article | 16 October 2013 Paper

Evaluation of ocean color data processing schemes for VIIRS sensor using in-situ data of coastal AERONET-OC sites

S. Ahmed, A. Gilerson, S. Hlaing, A. Weidemann, R. Arnone, M. Wang

Proceedings Volume 8888, 88880H (2013) https://doi.org/10.1117/12.2028821

KEYWORDS: Calibration, Sensors, MODIS, Satellites, Data processing, Water, Avalanche photodetectors, Ocean optics, Atmospheric modeling, Aerosols

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In the processing of Ocean Color (OC) data from sensor data recorded by Visible Infrared Imaging Radiometer Suite (VIIRS) aboard JPSS-Suomi satellite, NASA Ocean Biology Processing Group (OBPG) is deriving a continuous temporal calibration based on the on-board calibration measurements for the visible bands, and then reprocessing the full mission to produce a continuously calibrated sensor data record (SDR) product. In addition, a vicarious calibration during SDR to OC Level-2 processing is applied. In the latest processing the vicarious calibration is derived from the Marine Optical Buoy (MOBY) data, whereas in the initial processing it was derived from a sea surface reflectance model and a climatology of chlorophyll-a concentration. Furthermore, NASA has recently reprocessed the OC data for the entire VIIRS mission with lunar-based temporal calibration and updated vicarious gains. On the other hand, in fulfilling the mission of the U.S. National Oceanic and Atmospheric Administration (NOAA), the Interface Data Processing Segment (IDPS) developed by Raytheon Intelligence and Information Systems, for the processing of the environmental data products from sensor data records, has gained beta status for evaluation. As these processing schemes continue to evolve, monitoring the validity and assessments of the related VIIRS ocean color products are necessary, especially for coastal waters, to evaluate the consistency of these processing and calibration schemes. The ocean color component of the Aerosol Robotic Network (AERONET-OC) has been designed to support long-term satellite ocean color investigations through cross-site measurements collected by autonomous multispectral radiometer systems deployed above water. As part of this network, the Long Island Sound Coastal Observatory (LISCO) near New York City and WaveCIS in the Gulf of Mexico expand those observational capabilities with continuous monitoring as well as (for the LISCO site) additional assessment of the hyper-spectral properties of coastal waters. In the investigations carried out over a one and half year period dataset of VIIRS, based on the data from two coastal AERONET-OC sites, it has been observed that the VIIRS sensor captures well the seasonal and temporal variations in the nLw data, exhibiting significant correlation with in-situ data (R = 0.929 and 0.985 for LISCO and WaveCIS respectively). For the WaveCIS site, VIIRS nLw data retrievals are seen to be enhanced with each incremental adjustments of vicarious and calibration procedures. However, that is not the case for the LISCO site which exhibits more frequent occurrences of negative water-leaving radiances, while underestimation in VIIRS nLw data is further exacerbated. Strong consistency between the time-series nLw data retrieved from the VIIRS and MODIS sensors was also observed.

Proceedings Article | 16 October 2013 Paper

Polarization of light in shallow waters

Alexander Gilerson, Amir Ibrahim, Jan Stepinski, Samir Ahmed

Proceedings Volume 8888, 88880G (2013) https://doi.org/10.1117/12.2029247

KEYWORDS: Scattering, Polarization, Water, Light scattering, Reflectivity, Radiative transfer, Device simulation, Ocean optics, Rayleigh scattering, Atmospheric modeling

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Proceedings Article | 27 September 2013 Paper

The retrieval of scattering coefficient of marine particles from polarimetric observations

Amir Ibrahim, Alex Gilerson, Jan Stepinski, Ahmed El-Habashi, Samir Ahmed

Proceedings Volume 8873, 88730U (2013) https://doi.org/10.1117/12.2023546

KEYWORDS: Scattering, Particles, Sun, Light scattering, Water, Polarization, Absorption, Atmospheric modeling, Signal attenuation, Atmospheric particles

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Proceedings Article | 5 August 2013 Paper

Neural network approach to separate the non-algal absorption coefficient into dissolved and particulate

Ioannis Ioannou, Robert Foster, Alex Gilerson, Sam Ahmed

Proceedings Volume 8795, 87951N (2013) https://doi.org/10.1117/12.2028379

KEYWORDS: Absorption, Neural networks, Remote sensing, Reflectivity, Satellites, MODIS, Algorithm development, Sensors, Visible radiation, Water

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Proceedings Article | 3 June 2013 Paper

Polarimetric imaging of underwater targets

Alex Gilerson, Carlos Carrizo, Alberto Tonizzo, Amir Ibrahim, Ahmed El-Habashi, Robert Foster, Samir Ahmed

Proceedings Volume 8724, 872403 (2013) https://doi.org/10.1117/12.2018132

KEYWORDS: Cameras, Polarization, Scattering, Polarizers, Polarimetry, Mirrors, Light scattering, Water, Signal attenuation, Absorption

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Proceedings Article | 3 June 2013 Paper

Evaluation of VIIRS ocean color data using measurements from the AERONET-OC sites

Samir Ahmed, Alex Gilerson, Soe Hlaing, Ioannis Ioannou, Menghua Wang, Alan Weidemann, Robert Arnone

Proceedings Volume 8724, 87240L (2013) https://doi.org/10.1117/12.2017756

KEYWORDS: MODIS, Satellites, Aerosols, Sensors, Calibration, Statistical analysis, Atmospheric corrections, Avalanche photodetectors, Data processing, Ocean optics

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Proceedings Article | 3 June 2013 Paper

Neural network approach for the derivation of chlorophyll concentration from ocean color

Ioannis Ioannou, Robert Foster, Alex Gilerson, Barry Gross, Fred Moshary, Sam Ahmed

Proceedings Volume 8724, 87240P (2013) https://doi.org/10.1117/12.2018143

KEYWORDS: MODIS, Reflectivity, Water, Neural networks, Algorithm development, Absorption, Satellites, Remote sensing, Ocean optics, Data modeling

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Proceedings Article | 19 October 2012 Paper

Algal fluorescence: impact and potential for retrieval from measurements of the underwater degree of polarization

S. Ahmed, A. Tonizzo, A. Ibrahim, A. Gilerson, B. Gross, F. Moshary

Proceedings Volume 8532, 85320I (2012) https://doi.org/10.1117/12.974337

KEYWORDS: Luminescence, Polarization, Scattering, Water, Reflectivity, Light scattering, Particles, Absorption, Radiative transfer, Near infrared

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Proceedings Article | 12 June 2012 Paper

Polarization techniques for the retrieval of water parameters from above and below water polarimetric observations

Alex Gilerson, Amir Ibrahim, Tristan Harmel, Alberto Tonizzo, Samir Ahmed

Proceedings Volume 8372, 83720T (2012) https://doi.org/10.1117/12.919935

KEYWORDS: Particles, Scattering, Absorption, Polarization, Water, Signal attenuation, Sun, Refractive index, Optical properties, Light scattering

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Proceedings Article | 12 June 2012 Paper

Evaluation of atmospheric correction procedures for ocean color data processing using hyper- and multi-spectral radiometric measurements from the Long Island Sound Coastal Observatory

S. Ahmed, A. Gilerson, T. Harmel, S. Hlaing, A. Tonizzo, A. Weidemann, R. Arnone

Proceedings Volume 8372, 83720M (2012) https://doi.org/10.1117/12.919900

KEYWORDS: Satellites, Aerosols, Atmospheric corrections, MODIS, Atmospheric particles, Data processing, Atmospheric optics, Reflectivity, Atmospheric modeling, Sensors

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Proceedings Article | 11 June 2012 Paper

Polarimetric imaging and radiometry in shallow waters

Alberto Tonizzo, Alexander Gilerson, Carlos Carrizo, Jean-Paul Israel, Sam Ahmed

Proceedings Volume 8364, 83640U (2012) https://doi.org/10.1117/12.919938

KEYWORDS: Cameras, Polarimetry, Scattering, Polarization, Light scattering, Point spread functions, Signal attenuation, Modulation transfer functions, Sensors, Radiometry

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Proceedings Article | 8 October 2011 Paper

Bidirectional reflectance function in coastal waters: modeling and validation

Alex Gilerson, Soe Hlaing, Tristan Harmel, Alberto Tonizzo, Robert Arnone, Alan Weidemann, Samir Ahmed

Proceedings Volume 8175, 81750O (2011) https://doi.org/10.1117/12.898449

KEYWORDS: Reflectivity, Remote sensing, Magnesium, Bidirectional reflectance transmission function, Water, Computer simulations, Coastal modeling, Backscatter, Sensors, Data modeling

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Proceedings Article | 8 October 2011 Paper

Uncertainties assessment and satellite validation over 2 years time series of multispectral and hyperspectral measurements in coastal waters at Long Island Sound Coastal Observatory

S. Ahmed, T. Harmel, A. Gilerson, A. Tonizzo, S. Hlaing, A. Weidemann, R. Arnone

Proceedings Volume 8175, 817505 (2011) https://doi.org/10.1117/12.898299

KEYWORDS: Satellites, MODIS, Aerosols, Atmospheric optics, Data processing, Atmospheric particles, Atmospheric corrections, Remote sensing, Ocean optics, Calibration

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Proceedings Article | 8 October 2011 Paper

Measuring underwater polarization field from above-water hyperspectral instrumentation for water composition retrieval

T. Harmel, A. Tonizzo, A. Ibrahim, A. Gilerson, J. Chowdhary, S. Ahmed

Proceedings Volume 8175, 817509 (2011) https://doi.org/10.1117/12.898261

KEYWORDS: Polarization, Aerosols, Atmospheric modeling, Sensors, Water, Radiative transfer, Absorption, Scattering, Reflection, Signal attenuation

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Proceedings Article | 10 September 2011 Paper

Exploring the relation between polarized light fields and physical-optical characteristics of the ocean for remote sensing applications

Amir Ibrahim, Tristan Harmel, Alberto Tonizzo, Ioannis Ioannou, Alex Gilerson, Samir Ahmed

Proceedings Volume 8160, 81600H (2011) https://doi.org/10.1117/12.894113

KEYWORDS: Particles, Scattering, Water, Polarization, Sun, Refractive index, Signal attenuation, Light scattering, Absorption, Optical properties

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Proceedings Article | 5 May 2011 Paper

Estimation of the attenuation coefficient of the water body using polarimetric observations

Alberto Tonizzo, Amir Ibrahim, Tristan Harmel, Alex Gilerson, Samir Ahmed

Proceedings Volume 8030, 803003 (2011) https://doi.org/10.1117/12.884675

KEYWORDS: Scattering, Particles, Signal attenuation, Absorption, Water, Radiative transfer, Light scattering, Polarization, Atmospheric particles, Optical properties

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Proceedings Article | 5 May 2011 Paper

Hyperspectral and multispectral above-water radiometric measurements to monitor satellite data quality over coastal area

Samir Ahmed, Tristan Harmel, Alexander Gilerson, Soe Hlaing, Alberto Tonizzo, Curtiss Davis, Alan Weidemann, Robert Arnone

Proceedings Volume 8030, 803002 (2011) https://doi.org/10.1117/12.884674

KEYWORDS: Satellites, Sun, Data processing, Calibration, Sensors, Atmospheric corrections, Radiometry, Remote sensing, MODIS, Reflectivity

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Proceedings Article | 18 October 2010 Paper

Sensitivity of the above water polarized reflectance to the water composition

A. Tonizzo, T. Harmel, A. Ibrahim, S. Hlaing, I. Ioannou, A. Gilerson, J. Chowdhary, B. Gross, F. Moshary, S. Ahmed

Proceedings Volume 7825, 78250F (2010) https://doi.org/10.1117/12.865510

KEYWORDS: Sensors, Radiative transfer, Polarization, Absorption, Scattering, Water, Reflectivity, Atmospheric modeling, Contamination, Satellites

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Estimating the Stokes vector components of the polarized water radiance from above water measurements is a challenging task, mainly because of their small magnitude and the strong contamination by the sky light reflected on the sea surface. Consequently, in most applications the Stokes vector components are considered equal to zero except of I, the total reflectance. In this study, both below and above water measurements are used to assess the feasibility of such retrievals and their use to determine the water composition. In-water inherent optical properties (IOPs) were measured with commercially available instrumentation. In addition, in-water polarization characteristics were measured by our multi-angular hyperspectral sensor which provided the Stokes components for a scattering angles range of the 0-180° and a full spectral range between 400 and 750 nm. Second, a customized HyperSAS (Satlantic) instrument is used from the coastal platform in Long Island Sound, NY (LISCO) acquiring above water measurements. That instrumentation includes, in the standard configuration, two hyperspectral radiance sensors for measuring upwelling and sky radiances and one irradiance sensor for measuring downwelling irradiance. In our installation, HyperSAS capabilities were augmented by adding two radiance sensors having two polarizers oriented at 0 and 45°, with respect to a reference axis ("HyperSAS-POL"). An ad hoc procedure, which included measurements and radiative transfer computations, has been developed enabling to estimate the contribution of the sky glint and subtract it from the signal directly measured by HyperSAS-POL. As a result, the retrieved spectral shape of the underwater degree of polarization is consistent with what obtained from in situ underwater measurements and depends on the IOPs of the ocean itself. In addition, the demonstrated correctness of this polarized measurements from LISCO site enable us to provide continuous time series from the beginning of June 2010.

Proceedings Article | 7 October 2010 Paper

Validation of ocean color satellite sensors using coastal observational platform in Long Island Sound

Soe Hlaing, Tristan Harmel, Amir Ibrahim, Ioannis Ioannou, Alberto Tonizzo, Alexander Gilerson, Samir Ahmed

Proceedings Volume 7825, 782504 (2010) https://doi.org/10.1117/12.865123

KEYWORDS: Satellites, Calibration, MODIS, Sensors, Avalanche photodetectors, Remote sensing, Radiometry, Atmospheric corrections, Ocean optics, Hyperspectral imaging

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Proceedings Article | 20 April 2010 Paper

Estimation of the polarized water leaving radiance from above water measurements

A. Tonizzo, A. Ibrahim, J. Zhou, A. Gilerson, M. Twardowski, B. Gross, F. Moshary, S. Ahmed

Proceedings Volume 7678, 767803 (2010) https://doi.org/10.1117/12.850930

KEYWORDS: Water, Sensors, Absorption, Polarization, Signal attenuation, Scattering, Ocean optics, Optical properties, Particles, Reflectivity

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Proceedings Article | 20 April 2010 Paper

Characterizing bio-optical and ecological features of algal bloom waters for detection and tracking from space

S. Ahmed, R. Amin, I. Gladkova, A. Gilerson, M. Grossberg, S. Hlaing, F. Shariar, P. Alabi

Proceedings Volume 7678, 767804 (2010) https://doi.org/10.1117/12.852444

KEYWORDS: Luminescence, Satellites, Scattering, MODIS, Reflectivity, Backscatter, Databases, Sensors, Earth observing sensors, Detection and tracking algorithms

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Proceedings Article | 20 April 2010 Paper

The impact of algal fluorescence on the underwater polarized light field

A. Tonizzo, A. Ibrahim, J. Zhou, A. Gilerson, B. Gross, F. Moshary, S. Ahmed

Proceedings Volume 7678, 76780K (2010) https://doi.org/10.1117/12.850927

KEYWORDS: Luminescence, Polarization, Water, Scattering, Absorption, Particles, Radiative transfer, Refractive index, Reflectivity, Atmospheric particles

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Proceedings Article | 20 April 2010 Paper

Underwater polarization characteristics and their impact on water visibility

Jing Zhou, Alberto Tonizzo, Alex Gilerson, Barry Gross, Fred Moshary, Sam Ahmed

Proceedings Volume 7678, 76780J (2010) https://doi.org/10.1117/12.851021

KEYWORDS: Scattering, Polarization, Light scattering, Polarizers, Visibility, Sensors, Modulation transfer functions, Cameras, Water, Signal attenuation

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Proceedings Article | 10 September 2009 Paper

MODIS and MERIS detection of dinoflagellates blooms using the RBD technique

R. Amin, A. Gilerson, B. Gross, F. Moshary, S. Ahmed

Proceedings Volume 7473, 747304 (2009) https://doi.org/10.1117/12.830631

KEYWORDS: MODIS, Water, Ocean optics, Luminescence, Satellites, Backscatter, Sensors, Signal detection, Atmospheric corrections, Clouds

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Proceedings Article | 10 September 2009 Paper

New algorithm for MODIS chlorophyll fluorescence height retrieval: performance and comparison with the current product

I. Ioannou, J. Zhou, A. Gilerson, B. Gross, F. Moshary, S. Ahmed

Proceedings Volume 7473, 747309 (2009) https://doi.org/10.1117/12.830630

KEYWORDS: Luminescence, MODIS, Absorption, Reflectivity, Sensors, Scattering, Satellites, Signal detection, Computer simulations, Algorithm development

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Proceedings Article | 10 September 2009 Paper

Multiangular hyperspectral investigation of polarized light in case 2 waters

A. Tonizzo, J. Zhou, A. Gilerson, J. Chowdhary, B. Gross, F. Moshary, S. Ahmed

Proceedings Volume 7473, 747306 (2009) https://doi.org/10.1117/12.830629

KEYWORDS: Particles, Water, Absorption, Refractive index, Minerals, Polarization, Signal attenuation, Scattering, Radiative transfer, Remote sensing

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Proceedings Article | 19 August 2009 Paper

Inversion of inherent optical properties of water using artificial neural network techniques for coastal water

I. Ioannou, J. Zhou, A. Gilerson, B. Gross, F. Moshary, S. Ahmed

Proceedings Volume 7459, 745909 (2009) https://doi.org/10.1117/12.825386

KEYWORDS: Absorption, Data modeling, Water, Backscatter, Ultraviolet radiation, Neural networks, Reflectivity, Optical properties, Computer simulations, Remote sensing

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Proceedings Article | 19 August 2009 Paper

Evaluation of solar stimulated CDOM fluorescence and its impact on the closure of remote sensing reflectance

J. Zhou, A. Tonizzo, I. Ioannou, S. Hlaing, A. Gilerson, B. Gross, F. Moshary, S. Ahmed

Proceedings Volume 7459, 74590B (2009) https://doi.org/10.1117/12.825374

KEYWORDS: Luminescence, Reflectivity, Absorption, Remote sensing, Backscatter, Quantum efficiency, Optical properties, Fluorescence spectroscopy, Spectroscopy, Radiative transfer

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Proceedings Article | 19 August 2009 Paper

Assessment of 412nm bio-optical reflectance estimator for use in atmospheric correction

Barry Gross, Marco Vargas, Jing Zhou, Alexander Gilerson, Fred Moshary, Samir Ahmed

Proceedings Volume 7459, 745904 (2009) https://doi.org/10.1117/12.826272

KEYWORDS: Aerosols, Reflectivity, Atmospheric modeling, Biological research, Atmospheric corrections, Atmospheric particles, Short wave infrared radiation, Near infrared, Coastal modeling, Absorption

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Proceedings Article | 29 April 2009 Paper

Polarization characteristics of coastal waters and their impact on in-water visibility

Jing Zhou, Alberto Tonizzo, Alex Gilerson, Michael Twardowski, Deric Gray, Alan Weidemann, Robert Arnone, Barry Gross, Fred Moshary, Sam Ahmed

Proceedings Volume 7317, 73170H (2009) https://doi.org/10.1117/12.820738

KEYWORDS: Polarization, Scattering, Light scattering, Monte Carlo methods, Visibility, Ocean optics, Submerged target modeling, Cameras, Polarizers, Point spread functions

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Proceedings Article | 13 October 2008 Paper

Untangling the make-up of the NIR reflectance peak in coastal waters and its impact on remote sensing retrievals of [Chl] and fluorescence height algorithms

S. Ahmed, A. Gilerson, J. Zhou, R. Dyer, S. Hlaing, I. Ioannou, B. Gross, F. Moshary

Proceedings Volume 7105, 710508 (2008) https://doi.org/10.1117/12.800378

KEYWORDS: Luminescence, Absorption, Reflectivity, Near infrared, Quantum efficiency, Atmospheric corrections, Short wave infrared radiation, Lithium, Satellites, Backscatter

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Proceedings Article | 13 October 2008 Paper

Characterization of multi-angular hyperspectral polarized reflectance from coastal waters

A. Gilerson, A. Tonizzo, J. Zhou, R. Dyer, J. Chowdhary, B. Gross, F. Moshary, S. Ahmed

Proceedings Volume 7105, 710509 (2008) https://doi.org/10.1117/12.800395

KEYWORDS: Polarization, Scattering, Absorption, Sensors, Water, Reflectivity, Light scattering, Sun, Rayleigh scattering, Atmospheric particles

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Proceedings Article | 8 October 2007 Paper

Impact of scattering and absorption of photosynthetic pigments on fluorescence retrieval algorithms for coastal waters

S. Ahmed, A. Gilerson, J. Zhou, S. Hlaing, I. Ioannou, W. Jerez, B. Gross, F. Moshary

Proceedings Volume 6743, 674307 (2007) https://doi.org/10.1117/12.737431

KEYWORDS: Luminescence, Absorption, Reflectivity, MODIS, Minerals, Computer simulations, Satellites, Signal attenuation, Quantum efficiency, Near infrared

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Fluorescence Line Height (FLH) algorithms are effective for fluorescence retrieval in the open ocean where elastic reflectance in the fluorescence zone does not deviate much from the baseline. In coastal waters, FLH algorithms are significantly complicated by the overlap of the fluorescence and elastic reflectance peaks. To test accuracy of MODIS, MERIS and other FLH algorithms, we compared numerical simulations using an extensive synthetic database suitable for case II waters, with results of extensive field measurements of reflectance, absorption and attenuation spectra by us in the Chesapeake Bay, as well as satellite FLH data from several areas that typically show low correlation between [Chl] and FLH. Our synthetic datasets were created using the HYDROLIGHT radiative transfer code with IOP's connected to parameterized microphysical models in accordance with procedures used to generate the IOCCG dataset, but with some added improvements. These included higher (1 nm) spectral resolution, a wider range of parameters typical for coastal waters, including chlorophyll specific absorptions with significant variations in spectral shapes and magnitude. HYDROLIGHT simulations of elastic reflectance using measured attenuation/extinction spectra followed by subtraction from measured reflectance, permitted retrieval of the fluorescence contribution to the latter, for comparisons with the data set simulations. We find relatively small fluorescence contributions to surface reflectance for mineral concentrations > 5 mg/l because of strong attenuation in the excitation zone and enhanced elastic reflectance making fluorescence detection unrealistic. For lower mineral concentrations, we find that some combinations of NIR observation bands permit reasonably good FLH retrievals in conditions where specific absorption spectral variation is not very high, and that application of multi-spectral algorithms can be more efficient for the retrieval of fluorescence contributions in coastal areas.

Proceedings Article | 5 October 2007 Paper

Fluorescence contribution to reflectance spectra for a variety of coastal waters

A. Gilerson, J. Zhou, S. Hlaing, I. Ioannou, R. Amin, B. Gross, F. Moshary, S. Ahmed

Proceedings Volume 6680, 66800C (2007) https://doi.org/10.1117/12.731663

KEYWORDS: Luminescence, Absorption, Reflectivity, Minerals, Near infrared, Quantum efficiency, Scattering, Signal attenuation, Particles, Backscatter

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Proceedings Article | 25 September 2007 Paper

Continuous spectral measurement of backscattering in sea water

J. Zhou, A. Gilerson, I. Ioannou, B. Gross, F. Moshary, S. Ahmed

Proceedings Volume 6755, 67550J (2007) https://doi.org/10.1117/12.731642

KEYWORDS: Backscatter, Scattering, Luminescence, Light scattering, Optical filters, Absorption, Signal detection, Light sources, Lamps, Mie scattering

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Proceedings Article | 28 November 2006 Paper

Evaluation of the impact of backscatter spectral characteristics on Chl retrievals in coastal waters

S. Ahmed, A. Gilerson, J. Zhou, J. Chowdhary, I. Ioannou, R. Amin, B. Gross, F. Moshary

Proceedings Volume 6406, 64060A (2006) https://doi.org/10.1117/12.694177

KEYWORDS: Backscatter, Reflectivity, Absorption, Scattering, Near infrared, Signal attenuation, Particles, Water, Luminescence, Minerals

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Proceedings Article | 13 October 2006 Paper

The polarization properties of reflectance from coastal waters and the ocean-atmosphere system

S. Ahmed, A. Gilerson, M. Oo, J. Zhou, J. Chowdhary, B. Gross, F. Moshary

Proceedings Volume 6360, 636003 (2006) https://doi.org/10.1117/12.689168

KEYWORDS: Luminescence, Polarization, Reflectivity, Scattering, Water, Absorption, Minerals, Particles, Near infrared, Sensors

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Proceedings Article | 2 February 2006 Paper

Fluorescence extraction from reflectance spectra of ocean water using polarization discrimination

Jing Zhou, Alexander Gilerson, Fred Moshary, Barry Gross, Samir Ahmed

Proceedings Volume 6031, 603107 (2006) https://doi.org/10.1117/12.667897

KEYWORDS: Luminescence, Reflectivity, Polarization, Absorption, Scattering, Water, Particles, Light scattering, Backscatter, Mie scattering

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Proceedings Article | 20 October 2005 Paper

Polarization discrimination fluorescence retrieval from reflectance spectra of algae in seawater: Comparison of multicomponent Mie scattering and polarized radiative transfer models with laboratory and field tests

A. Gilerson, M. Oo, J. Chowdhary, B.M. Gross, F. Moshary, S. A. Ahmed

Proceedings Volume 5977, 597708 (2005) https://doi.org/10.1117/12.627723

KEYWORDS: Luminescence, Polarization, Reflectivity, Particles, Mie scattering, Absorption, Scattering, Minerals, Water, Radiative transfer

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Proceedings Article | 23 August 2005 Paper

Polarization characteristics of water-leaving radiance: application to separation of fluorescence and scattering components in coastal waters

A. Gilerson, M. Oo, J. Chowdhary, B. Gross, F. Moshary, S. Ahmed

Proceedings Volume 5885, 58850C (2005) https://doi.org/10.1117/12.615281

KEYWORDS: Luminescence, Polarization, Reflectivity, Absorption, Scattering, Particles, Light scattering, Minerals, Water, Radiative transfer

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Proceedings Article | 30 November 2004 Paper

Simple signal-to-noise parameterization scheme to assess lidar performance and its applications

Ravil Agishev, Adolfo Comeron, Barry Gross, Fred Moshary, Samir Ahmed, Alexander Gilerson, Valery Vlasov

Proceedings Volume 5571, (2004) https://doi.org/10.1117/12.566067

KEYWORDS: LIDAR, Signal to noise ratio, Signal detection, Backscatter, Photodetectors, Atmospheric optics, Atmospheric sensing, Aerosols, Line width roughness, Transmittance

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Proceedings Article | 16 November 2004 Paper

Properties and potential of a polarization technique for the separation of the overlapping fluorescence and elastic scattering applied to algae in seawater

Alexander Gilerson, Jing Zhou, Adrian Gill, Barry Gross, Fred Moshary, Samir Ahmed

Proceedings Volume 5569, (2004) https://doi.org/10.1117/12.565296

KEYWORDS: Luminescence, Reflectivity, Polarization, Light scattering, Scattering, Light sources, Surface roughness, Sensors, Water, Particles

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Proceedings Article | 9 November 2004 Paper

Polarization discrimination technique to separate overlapping fluorescence and elastic scattering applied to algae in seawater

Jing Zhou, Alexander Gilerson, Adrian Gill, Barry Gross, Fred Moshary, Samir Ahmed

Proceedings Volume 5544, (2004) https://doi.org/10.1117/12.559576

KEYWORDS: Luminescence, Polarization, Scattering, Reflectivity, Light scattering, Sensors, Water, Particles, Polarizers, Sun

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Proceedings Article | 15 September 2004 Paper

Development principles of frequency-modulated CW-ladar for remote detection of atmospheric trace constituents

Ravil Agishev, Rafael Sagdiev, Barry Gross, Fred Moshary, Alexander Gilerson, Samir Ahmed, Adolfo Comeron

Proceedings Volume 5547, (2004) https://doi.org/10.1117/12.560102

KEYWORDS: Modulation, LIDAR, Absorption, Spectroscopy, Atmospheric modeling, Frequency modulation, Atmospheric monitoring, Semiconductor lasers, Atmospheric sensing, Signal processing

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Proceedings Article | 13 September 2004 Paper

Atmospheric trace constituent detection by CW-FM-LD-ladar: a concept development

Ravil Agishev, Rafael Sagdiev, Barry Gross, Fred Moshary, Alexander Gilerson, Samir Ahmed, Adolfo Comeron

Proceedings Volume 5412, (2004) https://doi.org/10.1117/12.564439

KEYWORDS: Modulation, LIDAR, Spectroscopy, Absorption, Heterodyning, Semiconductor lasers, Optoelectronics, Frequency modulation, Photodetectors, Continuous wave operation

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Proceedings Article | 30 April 1999 Paper

High-speed grating-generated electronic coherence microscopy of biological tissue without moving parts

Alexandr Gilerson, Iosif Zeylikovich, Robert Alfano

Proceedings Volume 3598, (1999) https://doi.org/10.1117/12.347501

KEYWORDS: Tissues, Microscopy, Diffraction gratings, Charge-coupled devices, Optical coherence tomography, Coherence (optics), High speed electronics, Reconstruction algorithms, Cameras, Laser tissue interaction

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Showing 5 of 69 publications

Conference Committee Involvement (17)

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2024

16 September 2024 | Edinburgh, United Kingdom

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2023

4 September 2023 | Amsterdam, Netherlands

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2022

6 September 2022 | Berlin, Germany

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2021

13 September 2021 | Online Only, Spain

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2020

22 September 2020 | Online Only, United Kingdom

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2019

9 September 2019 | Strasbourg, France

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2018

10 September 2018 | Berlin, Germany

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2017

11 September 2017 | Warsaw, Poland

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2016

26 September 2016 | Edinburgh, United Kingdom

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2015

23 September 2015 | Toulouse, France

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2014

24 September 2014 | Amsterdam, Netherlands

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2013

24 September 2013 | Dresden, Germany

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2012

26 September 2012 | Edinburgh, United Kingdom

Remote Sensing of the Ocean, Sea Ice, Coastal Waters, and Large Water Regions 2011

21 September 2011 | Prague, Czech Republic

Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2010

22 September 2010 | Toulouse, France

Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2009

31 August 2009 | Berlin, Germany

Remote Sensing of the Ocean, Sea Ice, and Large Water Regions 2008

15 September 2008 | Cardiff, Wales, United Kingdom

Showing 5 of 17 Conference Committees

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