A5016057298- Remote-Sensing Image Classification
- Marine and coastal ecosystems
- Spectroscopy and Chemometric Analyses
- Water Quality Monitoring and Analysis
- Ionosphere and magnetosphere dynamics
- Magnetic confinement fusion research
- Remote Sensing in Agriculture
- Geochemistry and Geologic Mapping
- Infrared Target Detection Methodologies
- Calibration and Measurement Techniques
- Remote Sensing and Land Use
- Advanced Image Fusion Techniques
- Water Quality Monitoring Technologies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Atmospheric aerosols and clouds
- Plasma Diagnostics and Applications
- Solar and Space Plasma Dynamics
- Optical Polarization and Ellipsometry
- Coral and Marine Ecosystems Studies
- Remote Sensing and LiDAR Applications
- Laser-induced spectroscopy and plasma
- Atmospheric chemistry and aerosols
- Satellite Image Processing and Photogrammetry
- Ship Hydrodynamics and Maneuverability
- Atmospheric Ozone and Climate
United States Naval Research Laboratory
2011-2022
Naval Research Laboratory Remote Sensing Division
2010-2022
Met Office
2019
K Lab (United States)
2003-2010
Naval Research Laboratory Center for Bio/Molecular Science and Engineering
2007
United States Navy
2007
Research Support Instruments (United States)
2007
University of California, Irvine
1992-1997
Naval Research Laboratory Plasma Physics Division
1994-1996
A spectrum-matching and look-up-table (LUT) methodology has been developed evaluated to extract environmental information from remotely sensed hyperspectral imagery. The LUT works as follows. First, a database of remote-sensing reflectance (Rrs) spectra corresponding various water depths, bottom spectra, water-column inherent optical properties (IOPs) is constructed using special version the HydroLight radiative transfer numerical model. Second, measured Rrs spectrum for particular image...
The Ocean Portable Hyperspectral Imager for Low-Light Spectroscopy (Ocean PHILLS) is a hyperspectral imager specifically designed imaging the coastal ocean. It uses thinned, backsideilluminated CCD high sensitivity and an all-reflective spectrograph with convex grating in Offner configuration to produce nearly distortionfree image. sensor, which was constructed entirely from commercially available components, has been successfully deployed during several oceanographic experiments 1999-2001....
Abstract The INCOMPASS field campaign combines airborne and ground measurements of the 2016 Indian monsoon, towards ultimate goal better predicting monsoon rainfall. supplies majority water in South Asia, but forecasting from days to season ahead is limited by large, rapidly developing errors model parametrizations. lack detailed observations prevents thorough understanding circulation its interaction with land surface: a process governed boundary‐layer convective‐cloud dynamics. used UK...
Errors in the estimated constituent concentrations optically complex waters due solely to sensor noise a spaceborne hyperspectral can be as high 80%. The goal of this work is elucidate effect signal-to-noise ratio (SNR) on accuracy retrieved concentrations. Large variations magnitude and spectral shape reflectances from coastal complicate impact SNR estimation. Due low reflectance water, actual encountered for water target usually quite lower than prescribed SNR. significant source error...
Laboratory observations of reactively driven plasma waves in the ion-cyclotron frequency range associated with a localized, transverse dc electric field are reported. This wave excitation occurs even when field-aligned current is negligible, situation often reported space environment. The fluctuation spectrum broadband and its peak depends on magnitude field. Comparison theory indicates that these result from strong inhomogeneity energy density caused by sheared...
We report recent progress using a filter vector technique to analyze the data from hyperspectral image. The finds optimal vectors for demixing complex patterns found in method has potential be implemented real time since it is fully parallel. Computation of given family known species fast and direct improved algorithms developing algorithm which may updated as conditions change possible. Advantages techniques over pattern matching will discussed. portable images low light spectroscopy...
Recent sounding rocket experiments, such as SCIFER, AMICIST, and ARCS‐4, satellite data from FAST, Freja, DE‐2, HILAT, provide compelling evidence of a correlation between small‐scale spatial plasma inhomogeneities, broadband low‐frequency waves, transversely heated ions. These naturally arising, localized inhomogeneities can lead to sheared cross‐magnetic‐field flows, situation that has been shown have potential for instability growth. Experiments performed in the Naval Research...
Spectral graph theory has proven to be a useful tool in the analysis of high-dimensional data sets. Recall that, mathematically, is collection objects (nodes) and connections between them (edges); weighted additionally assigns numerical values (weights) edges. Graphs are represented by their adjacency whose elements weights nodes. uses eigendecomposition matrix (or, more generally, Laplacian graph) derive information about underlying graph. In this paper, we develop spectral method based on...
We present here results that demonstrate the potential of near-infrared (NIR)-red models to estimate chlorophyll- a (chl- a) concentration in coastal waters using data from spaceborne Hyperspectral Imager for Coastal Ocean (HICO). Since recent demise MEdium Resolution Imaging Spectrometer (MERIS), use sensors such as HICO has become critical ocean color research. Algorithms based on two- and three-band NIR-red models, which were previously used very successfully with MERIS data, applied...
In this paper, we examine the accuracy of manifold coordinate representations as a reduced representation hyperspectral imagery (HSI) lookup table (LUT) for bathymetry retrieval. We also explore on more limited basis potential using these coordinates modeling other in water properties. Manifold are chosen because they data-driven intrinsic set coordinates, which naturally parameterize nonlinearities that present HSI scenes. The approach is based extraction dimensionality sufficiently large...
Using simulated data, we investigated the effect of noise in a spaceborne hyperspectral sensor on accuracy atmospheric correction at-sensor radiances and consequent uncertainties retrieved water quality parameters. Specifically, improvement expected as F-number is changed from 3.5, which smallest among existing operational sensors, to 1.0, foreseeable near future. With change F-number, atmospherically corrected reflectance decreased by more than 90% across visible-near-infrared spectrum,...
The Hyperspectral Imager for the Coastal Ocean (HICO) presently onboard International Space Station (ISS) is an imaging spectrometer designed remote sensing of coastal waters. instrument not equipped with any spectral and radiometric calibration devices. Here we describe vicarious techniques that have been used in converting HICO raw digital numbers to calibrated radiances. based on matching atmospheric water vapor oxygen absorption bands extraterrestrial solar lines. comparisons between...
Recent advances in large format detector arrays and holographic diffraction gratings have made possible the development of imaging spectrographs with high sensitivity resolution, at relatively low component cost. Several airborne instruments been built for visible near IR spectral band 10-nm SNR 200:1. Three are compared, an all-reflective spectrography using a convex grating Offner configuration, two off-the-shelf transmission volume holograms. The camera is 1024 X frame transfer,...
This is the publisher’s final pdf. The published article copyrighted by Oceanography Society and can be found at: http://www.tos.org/.
Perpendicular ion heating resulting from velocity‐shear‐driven ion‐cyclotron waves has been measured for the first time. The experiment was performed in Naval Research Laboratory's Space Physics Simulation Chamber (SPSC) under plasma conditions approaching those natural space environment. Sheared cross‐field flow is induced by a controllable, inhomogeneous, transverse, DC electric field ( L E ∼ (1–2)ρ i ) created without drawing significant levels of magnetic‐field aligned current. Mode...
The covered lantern project was initiated by the central MASINT Technology Coordination Office to demonstrate tactical use of hyperspectral imagery with real time processing capability. We report on design and HYCORDER system developed for Covered Lantern that tested in June 1995. consisted an imaging spectrometer flying a Pioneer Uncrewed Aeronautical Vehicle ground based analysis visualization system. camera intensified allowing dawn dusk operation. spectral information downlinked as...
Direct measurements of velocity-space transport coefficients, which may be interpreted as the Fokker-Planck in direction confining magnetic field are reported. The were made using techniques laser-induced fluorescence and optical tagging, allow ions to followed phase space. results show that a plasma with nearly only thermal fluctuations data agree well test particle calculations by N. Rostoker for classical collisional processes. In presence larger-amplitude drift-wave there is pronounced...
Municipal wastewater discharged into the ocean through a submerged pipe, or outfall, can rise buoyantly to sea surface, resulting in near-field mixing zone and, presence of an ambient current, extended surface plume. In this paper, data from CASI (Compact Airborne Spectrographic Imager) and airborne infrared (IR) camera are shown detect municipal discharge off southeast coast Florida, U.S.A., its elevated levels chromophoric dissolved organic matter plus detrital material (CDOM) cooler...
In this paper, we describe the design, fabrication, calibration, and deployment of an airborne multispectral polarimetric imager. The motivation for development instrument was to explore its ability provide information about water constituents, such as particle size type. is based on four 16 MP cameras uses wire grid polarizers (aligned at 0°, 45°, 90°, 135°) separation polarization states. A five-position filter wheel provides narrow-band spectral filters (435, 550, 625, 750 nm) one blocked...
We report on the design, construction, and use of a large cavity microwave plasma source. The source is designed to provide range space-plasma-like conditions in Naval Research Laboratory Space Physics Simulation Chamber. A new feature design incorporates hard anodized aluminum as internal area surface does not conventional quartz liner which prone overheating cracking with extended use. By placing number small outlet holes around 36.8 cm output plate, we are able fairly radially uniform...
We continue previous work that generalizes the traditional linear mixing model from a combination of endmember vectors to multi-dimensional affine subspaces. This generalization allows handle natural variation is present real-world hyperspectral imagery. Once subspaces have been defined, scene may be demixed as usual, allowing for existing post-processing algorithms (classification, etc.) proceed as-is. In addition, subspace naturally incorporates use physics-based modeling approaches...
Airborne measurements of the linear polarization state light were carried out over coastal and open ocean conditions to study aerosol water column properties investigate possibility using a multi-spectral, hyper-angular imaging polarimeter for retrieving hydrosol optical properties. The instrument, Versatile Imager Coastal Ocean (VICO), is used support analysis color polarized observations their implication future space-borne polarimetry such as polarimeters planned be deployed with NASA...