Mr. Sherwin D. Ladner Profile

Sherwin D. Ladner

Oceanographer

SPIE Involvement:

Author

Publications (30)

Proceedings Article | 30 August 2019 Presentation + Paper

Assessing nanosatellite capabilities for accurate water-leaving radiance retrievals in coastal ocean waters: a forced aerosol model approach

Sean McCarthy, Mark David Lewis, Stephanie Anderson, Paul Martinolich, Sherwin Ladner, Adam Lawson, Jason Jolliff, Richard Gould

Proceedings Volume 11131, 111310A (2019) https://doi.org/10.1117/12.2530336

KEYWORDS: Atmospheric modeling, Aerosols, Atmospheric corrections, Calibration, Planets, Data modeling, Sensors, Coastal modeling, Remote sensing, Optical properties

Read Abstract +

Proceedings Article | 10 May 2019 Presentation + Paper

The hyperspectral signatures of complex ocean frontal boundaries: The example of cold air outbreaks in the northern Gulf of Mexico

Jason Jolliff, Sherwin Ladner, David Lewis, Ewa Jarosz, Richard Crout, Adam Lawson, Travis Smith, Sean McCarthy, Stephanie Cayula

Proceedings Volume 11014, 1101409 (2019) https://doi.org/10.1117/12.2518474

KEYWORDS: Sensors, Earth observing sensors, Meteorology, Water, Satellites, Ocean optics, Satellite imaging, Reflectivity, Latex

Read Abstract +

Proceedings Article | 10 May 2019 Presentation + Paper

An initial approach for using chromaticity to develop hyperspectral signals for satellite multispectral ocean-color imagery

Sean McCarthy, Jason Jolliff, Sherwin Ladner, Mark David Lewis

Proceedings Volume 11014, 110140A (2019) https://doi.org/10.1117/12.2519311

KEYWORDS: Satellites, Water, Remote sensing, In situ metrology, Ocean optics, Calibration, Satellite imaging, Reflectivity, Earth observing sensors, Multispectral imaging

Read Abstract +

Proceedings Article | 10 May 2019 Presentation + Paper

Establishing optimal matchup protocols between ocean color satellites and ground truth AeroNET-OC radiance

Adam Lawson, Sherwin Ladner, Richard Crout, Christopher Wood, Robert Arnone, Jennifer Bowers, Paul Martinolich, David Lewis

Proceedings Volume 11014, 110140C (2019) https://doi.org/10.1117/12.2521062

KEYWORDS: Satellites, Sensors, Calibration, Stray light, Satellite navigation systems, Error analysis, Solids, Earth observing sensors, Aerosols, Sensor calibration

Read Abstract +

The SAtellite VAlidation Navy Tool (SAVANT) was developed by the Navy to help facilitate the assessment of the stability and accuracy of ocean color satellites using ground truth (insitu) platform and buoy stations positioned around the globe and support methods for match-up protocols. This automated, continuous monitoring system for satellite ocean color sensors employs a website interface to extract and graph coincident satellite and insitu data in near-real-time. Available satellite sensors include MODerate resolution Imaging Spectrometer (MODIS) onboard the Aqua satellite, Visible Infrared Imaging Radiometer Suite (VIIRS) onboard Suomi National Polar-orbitting Partnership (SNPP) & Joint Polar Satellite Sensor (JPSS), Ocean and Land Colour Instrument (OLCI) onboard the Sentinel 3A and Geostationary Ocean Color Imager (GOCI) onboard the Communication, Ocean and Meteorological Satellite (COMS). SAVANT houses an extensive match-up data set covering nineteen plus years (2000- 2019) of coincident global satellite and ground truth spectral Normalized Water Leaving Radiance (nLw) data allowing users to evaluate the accuracy of ocean color sensors spectral water leaving radiance at specific ground truth sites that provide continuous data. The tool permits changing different match-up constraints and evaluating the effects on the match-up uncertainty. Results include: a) the effects of spatial selection (using single satellite pixel versus 3x3 and 5x5 boxes, all centered around the insitu location), b) time difference between satellite overpass and ground truth observations, c) and satellite and solar zenith angles. Match-up uncertainty analyses was performed on VIIRS SNPP at the AErosol RObotic NETwork Ocean Color (AeroNET-OC) Wave Current surge Information System (WavCIS) site, maintained by NRL and the Louisiana State University (LSU) in the North Central Gulf of Mexico onboard the Chevron platform CSI-06. The VIIRS SNPP and AeroNET-OC assessment determined optimal satellite ocean color cal/val match-up protocols that reduced uncertainty in the derived satellite products.

Proceedings Article | 10 May 2019 Paper

Delineation of suspended solids in river outflow from Hurricane Florence using GOES-16 ABI data

Mark David Lewis, Jason Jolliff, Sherwin Ladner, Sean McCarthy, Adam Lawson, Paul Martinolich

Proceedings Volume 11014, 110140B (2019) https://doi.org/10.1117/12.2519369

KEYWORDS: Sensors, Aerosols, Calibration, Atmospheric modeling, Satellites, Solids, Data modeling, MODIS, Computer simulations, Atmospheric corrections

Read Abstract +

Proceedings Article | 25 May 2018 Presentation + Paper

Hyperspectral determination of ocean color as an ocean monitoring tool: example applications in the Gulf of Mexico

Jason Jolliff, Sherwin Ladner, David Lewis, Ewa Jarosz, Adam Lawson, Travis Smith, Allison Penko, Sean McCarthy

Proceedings Volume 10631, 1063104 (2018) https://doi.org/10.1117/12.2307253

KEYWORDS: Satellites, Data modeling, Ocean optics, MODIS, Reflectivity, Earth observing sensors, Satellite imaging, RGB color model, Remote sensing, Liquid crystals

Read Abstract +

Proceedings Article | 25 May 2018 Paper

Near real time calibration of the Ocean Land Colour Imager

Jennifer Bowers, Paul Martinolich, Richard Crout, Sherwin Ladner, Adam Lawson

Proceedings Volume 10631, 1063105 (2018) https://doi.org/10.1117/12.2309996

KEYWORDS: Calibration, Satellites, Data processing, Sensors, Error analysis, Imaging systems, Sensor calibration, Satellite imaging

Read Abstract +

Proceedings Article | 25 May 2018 Presentation + Paper

Seasonal trends of biophysical ocean properties and anomalies across the Mississippi Shelf

Robert Arnone, Brooke Jones , Sherwin Ladner , Inia Soto

Proceedings Volume 10631, 1063102 (2018) https://doi.org/10.1117/12.2309427

KEYWORDS: Water, Ultraviolet radiation, Satellites, Backscatter, Ecosystems, Particles, Coastal modeling, Data modeling, Temperature metrology, Visible radiation

Read Abstract +

The seasonal cycle in surface biological, optical and physical properties across the river dominated Mississippi (MS) Shelf changed during years 2015 to 2017 at different locations across the shelf. VIIRS satellite and ocean model products were used to monitor cycles for different properties of both the nowcast and anomalous water properties. MS Shelf water properties vary spatially between offshore waters and coastal MS Sound waters, as well as temporally throughout the year. Ten selected regions spanning east to west from the MS Sound to the shelf break characterized the cross shelf seasonal fluctuations in satellite-derived chlorophyll-a, backscattering, euphotic depth, sea surface temperature, and modeled salinity currents. The seasonal relationships between physical and bio-optical properties were determined for different regions across the shelf and the seasonal eastward movement of the MS river plume across the shelf was identified in June. Yearly MS Sound seasonal cycles of coastal bio-physical properties are different from the shelf regions’ offshore seasonal cycles and indicate a time-lag between the bio-optical responses to the physical properties. Bio-optical and physical results on the shelf indicated seasonal movements of the MS River plume locations. Results show the seasonal bio-physical response of the shelf waters which can be used to address and understand the timing of data collection and how ocean events are influenced by the natural seasonal cycle interactions between biological and physical properties. The seasonal cycle study will enable the ability to monitor the shelf water quality and to identify non-typical conditions and the impact of an event on the cycle. Correlations between the monthly seasonal cycle of bio-optical and physical properties such as salinity, ocean color, chlorophyll-a and particle scattering were not consistent over the shelf. Seasonal cycles of salinity and chlorophyll-a show improved correlation if chlorophyll-a is delayed one month from the salinity at offshore locations on the shelf. Results of the seasonal trends support how data collected at a single image location on the shelf during a certain month can be different from other seasons. The seasonal cycle of the dynamic anomaly properties (DAP) of bio-physical properties were determined to show how seasonal abnormal changes and trends at locations across the shelf can provide a method for seasonal adaptive sampling. The yearly differences in monthly cycles from 2015 to 2017 at shelf locations, identified elevated chlorophyll-a in several months of 2016 and yearly temperature differences in multiple areas. The seasonal cycle of Euphotic depth, solar UV light penetration, showed a maximum peak (deeper Euphotic depth) at certain shelf locations during the months of September and October and minimal penetration in Aug of 20152016,2017. This information could be useful to understand months for maximum oil UV degradation in case of an oil spill

Proceedings Article | 22 May 2017 Presentation + Paper

Simulating biogeo-optical dynamics in the bottom boundary layer: northern Gulf of Mexico test case

Jason Jolliff, Sherwin Ladner, Travis Smith, Allison Penko, Ewa Jarosz, Todd Lovitt

Proceedings Volume 10186, 101860S (2017) https://doi.org/10.1117/12.2263644

KEYWORDS: Ocean optics, Coastal modeling, Remote sensing, Data modeling, 3D modeling, Biomedical optics, Numerical modeling, Satellite imaging, Earth observing sensors, Satellites, 3D image processing, Complex systems

Read Abstract +

SPIE Journal Paper | 9 May 2017 Open Access

Diurnal changes in ocean color sensed in satellite imagery

Robert Arnone, Ryan Vandermeulen, Inia Soto, Sherwin Ladner, Michael Ondrusek, Haoping Yang

JARS, Vol. 11, Issue 03, 032406, (May 2017) https://doi.org/10.1117/12.10.1117/1.JRS.11.032406

KEYWORDS: Satellites, Earth observing sensors, Satellite imaging, Radiometry, Ocean optics, Space robots, Aerosols, Robotics, Visualization, Infrared imaging

Read Abstract +

DOWNLOAD PAPER

Proceedings Article | 17 May 2016 Paper

Diurnal changes in ocean color in coastal waters

Robert Arnone, Ryan Vandermeulen, Sherwin Ladner, Michael Ondrusek, Charles Kovach, Haoping Yang, Joseph Salisbury

Proceedings Volume 9827, 982711 (2016) https://doi.org/10.1117/12.2241018

KEYWORDS: Satellites, Sensors, Water, Earth observing sensors, Ocean optics, Radiometry, Calibration, MODIS, Absorption, Data modeling

Read Abstract +

SPIE Journal Paper | 23 July 2015 Open Access

Improving remotely sensed fused ocean data products through cross-sensor calibration

Mark Lewis, Ruhul Amin, Sonia Gallegos, Richard Gould, Sherwin Ladner, Adam Lawson, Rong-Rong Li

JARS, Vol. 9, Issue 01, 095063, (July 2015) https://doi.org/10.1117/12.10.1117/1.JRS.9.095063

KEYWORDS: MODIS, Sensors, Calibration, Atmospheric corrections, Sensor calibration, Clouds, Satellites, In situ remote sensing, Data fusion, Near infrared

Read Abstract +

DOWNLOAD PAPER