Elijah Ramsey, III, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 76
Oil detection in a coastal marsh with polarimetric Synthetic Aperture Radar (SAR)
The National Aeronautics and Space Administration's airborne Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) was deployed in June 2010 in response to the Deepwater Horizon oil spill in the Gulf of Mexico. UAVSAR is a fully polarimetric L-band Synthetic Aperture Radar (SAR) sensor for obtaining data at high spatial resolutions. Starting a month prior to the UAVSAR collections, visual o
Authors
Elijah W. Ramsey, Amina Rangoonwala, Yukihiro Suzuoki, Cathleen E. Jones
Monitoring coastal inundation with Synthetic Aperture Radar satellite data
Maps representing the presence and absence of surface inundation in the Louisiana coastal zone were created from available satellite scenes acquired by the Japanese Aerospace Exploration Agency's Advanced Land Observing Satellite and by the European Space Agency's Envisat from late 2006 through summer 2009. Detection of aboveground surface flooding relied on the well-documented and distinct signat
Authors
Yukihiro Suzuoki, Amina Rangoonwala, Elijah W. Ramsey
Monitoring duration and extent of storm-surge and flooding in Western Coastal Louisiana marshes with Envisat ASAR data
Inundation maps of coastal marshes in western Louisiana were created with multitemporal Envisat Advanced Synthetic Aperture (ASAR) scenes collected before and during the three months after Hurricane Rita landfall in September 2005. Corroborated by inland water-levels, 7 days after landfall, 48% of coastal estuarine and palustrine marshes remained inundated by storm-surge waters. Forty-five days af
Authors
Elijah Ramsey, Zhong Lu, Yukihiro Suzuoki, Amina Rangoonwala, Dirk Werle
Daily MODIS data trends of hurricane-induced forest impact and early recovery
We studied the use of daily satellite data from the Moderate Resolution Imaging Spectroradiometer (MODIS) sensors to assess wetland forest damage and recovery from Hurricane Katrina (29 August 2005 landfall). Processed MODIS daily vegetation index (VI) trends were consistent with previously determined impact and recovery patterns provided by the "snapshot" 25 m Landsat Thematic Mapper optical and
Authors
Elijah W. Ramsey, Joseph Spruce, Amina Rangoonwala, Yukihiro Suzuoki, James Smoot, Jerry Gasser, Terri Bannister
Mapping the onset and progression of marsh dieback
Along the Gulf of Mexico (GOM) coasts, vast wetlands inject valuable nutrients and suspended and dissolved materials into the coastal ocean. Juncus roemerianus (black needlerush) wetlands, dominating coastlines in the northeastern GOM, transition to the Spartina alternifl ora (smooth cordgrass) coastline of Louisiana. Mixed marsh and mangrove barrier island systems occupy the southeastern and sout
Authors
Elijah Ramsey III, Amina Rangoonwala
Satellite optical and radar data used to track wetland forest impact and short-term recovery from Hurricane Katrina
Satellite Landsat Thematic Mapper (TM) and RADARSAT-1 (radar) satellite image data collected before and after the landfall of Hurricane Katrina in the Pearl River Wildlife Management Area on the Louisiana-Mississippi border, USA, were applied to the study of forested wetland impact and recovery. We documented the overall similarity in the radar and optical satellite mapping of impact and recovery
Authors
Elijah W. Ramsey, A. Rangoonwala, B. Middleton, Z. Lu
A case of timely satellite image acquisitions in support of coastal emergency environmental response management
The synergistic application of optical and radar satellite imagery improves emergency response and advance coastal monitoring from the realm of “opportunistic” to that of “strategic.” As illustrated by the Hurricane Ike example, synthetic aperture radar imaging capabilities are clearly applicable for emergency response operations, but they are also relevant to emergency environmental management. I
Authors
Elijah W. Ramsey, Dirk Werle, Zhong Lu, Amina Rangoonwala, Yukihiro Suzuoki
Characterizing the marsh dieback spectral response at the plant and canopy level with hyperspectral and temporal remote sensing data
We describe newly developed remote sensing tools to map the localized occurrences and regional distribution of the marsh dieback in coastal Louisiana (Fig. 1). As a final goal of our research and development, we identified what spectral features accompanied the onset of dieback and could be directly linked to the optical signal measured at the satellite. In order to accomplish our research goal, w
Authors
E. Ramsey, A. Rangoonwala
Integrating image and GIS processing to map a complex landscape with national vegetation classification system protocols and high spatial resolution image data
No abstract available.
Authors
Amina Rangoonwala, Elijah Ramsey
Remote sensing methods for mapping the onset and progression of spartina alterniflora marsh dieback in coastal Louisiana
No abstract available.
Authors
Amina Rangoonwala, Elijah Ramsey III, Gene Nelson
Multiple baseline radar interferometry applied to coastal land cover classification and change analyses
ERS-1 and ERS-2 SAR data were collected in tandem over a four-month period and used to generate interferometric coherence, phase, and intensity products that we compared to a classified land cover coastal map of Big Bend, Florida. Forests displayed the highest intensity, and marshes the lowest. The intensity for fresh marsh and forests progressively shifted while saline marsh intensity variance di
Authors
Elijah W. Ramsey, Z. Lu, A. Rangoonwala, Russ Rykhus
Canopy reflectance related to marsh dieback onset and progression in Coastal Louisiana
In this study, we extended previous work linking leaf spectral changes, dieback onset, and progression of Spartina alterniflora marshes to changes in site-specific canopy reflectance spectra. First, we obtained canopy reflectance spectra (approximately 20 m ground resolution) from the marsh sites occupied during the leaf spectral analyses and from additional sites exhibiting visual signs of diebac
Authors
Elijah W. Ramsey, A. Rangoonwala
Science and Products
Filter Total Items: 76
Oil detection in a coastal marsh with polarimetric Synthetic Aperture Radar (SAR)
The National Aeronautics and Space Administration's airborne Uninhabited Aerial Vehicle Synthetic Aperture Radar (UAVSAR) was deployed in June 2010 in response to the Deepwater Horizon oil spill in the Gulf of Mexico. UAVSAR is a fully polarimetric L-band Synthetic Aperture Radar (SAR) sensor for obtaining data at high spatial resolutions. Starting a month prior to the UAVSAR collections, visual o
Authors
Elijah W. Ramsey, Amina Rangoonwala, Yukihiro Suzuoki, Cathleen E. Jones
Monitoring coastal inundation with Synthetic Aperture Radar satellite data
Maps representing the presence and absence of surface inundation in the Louisiana coastal zone were created from available satellite scenes acquired by the Japanese Aerospace Exploration Agency's Advanced Land Observing Satellite and by the European Space Agency's Envisat from late 2006 through summer 2009. Detection of aboveground surface flooding relied on the well-documented and distinct signat
Authors
Yukihiro Suzuoki, Amina Rangoonwala, Elijah W. Ramsey
Monitoring duration and extent of storm-surge and flooding in Western Coastal Louisiana marshes with Envisat ASAR data
Inundation maps of coastal marshes in western Louisiana were created with multitemporal Envisat Advanced Synthetic Aperture (ASAR) scenes collected before and during the three months after Hurricane Rita landfall in September 2005. Corroborated by inland water-levels, 7 days after landfall, 48% of coastal estuarine and palustrine marshes remained inundated by storm-surge waters. Forty-five days af
Authors
Elijah Ramsey, Zhong Lu, Yukihiro Suzuoki, Amina Rangoonwala, Dirk Werle
Daily MODIS data trends of hurricane-induced forest impact and early recovery
We studied the use of daily satellite data from the Moderate Resolution Imaging Spectroradiometer (MODIS) sensors to assess wetland forest damage and recovery from Hurricane Katrina (29 August 2005 landfall). Processed MODIS daily vegetation index (VI) trends were consistent with previously determined impact and recovery patterns provided by the "snapshot" 25 m Landsat Thematic Mapper optical and
Authors
Elijah W. Ramsey, Joseph Spruce, Amina Rangoonwala, Yukihiro Suzuoki, James Smoot, Jerry Gasser, Terri Bannister
Mapping the onset and progression of marsh dieback
Along the Gulf of Mexico (GOM) coasts, vast wetlands inject valuable nutrients and suspended and dissolved materials into the coastal ocean. Juncus roemerianus (black needlerush) wetlands, dominating coastlines in the northeastern GOM, transition to the Spartina alternifl ora (smooth cordgrass) coastline of Louisiana. Mixed marsh and mangrove barrier island systems occupy the southeastern and sout
Authors
Elijah Ramsey III, Amina Rangoonwala
Satellite optical and radar data used to track wetland forest impact and short-term recovery from Hurricane Katrina
Satellite Landsat Thematic Mapper (TM) and RADARSAT-1 (radar) satellite image data collected before and after the landfall of Hurricane Katrina in the Pearl River Wildlife Management Area on the Louisiana-Mississippi border, USA, were applied to the study of forested wetland impact and recovery. We documented the overall similarity in the radar and optical satellite mapping of impact and recovery
Authors
Elijah W. Ramsey, A. Rangoonwala, B. Middleton, Z. Lu
A case of timely satellite image acquisitions in support of coastal emergency environmental response management
The synergistic application of optical and radar satellite imagery improves emergency response and advance coastal monitoring from the realm of “opportunistic” to that of “strategic.” As illustrated by the Hurricane Ike example, synthetic aperture radar imaging capabilities are clearly applicable for emergency response operations, but they are also relevant to emergency environmental management. I
Authors
Elijah W. Ramsey, Dirk Werle, Zhong Lu, Amina Rangoonwala, Yukihiro Suzuoki
Characterizing the marsh dieback spectral response at the plant and canopy level with hyperspectral and temporal remote sensing data
We describe newly developed remote sensing tools to map the localized occurrences and regional distribution of the marsh dieback in coastal Louisiana (Fig. 1). As a final goal of our research and development, we identified what spectral features accompanied the onset of dieback and could be directly linked to the optical signal measured at the satellite. In order to accomplish our research goal, w
Authors
E. Ramsey, A. Rangoonwala
Integrating image and GIS processing to map a complex landscape with national vegetation classification system protocols and high spatial resolution image data
No abstract available.
Authors
Amina Rangoonwala, Elijah Ramsey
Remote sensing methods for mapping the onset and progression of spartina alterniflora marsh dieback in coastal Louisiana
No abstract available.
Authors
Amina Rangoonwala, Elijah Ramsey III, Gene Nelson
Multiple baseline radar interferometry applied to coastal land cover classification and change analyses
ERS-1 and ERS-2 SAR data were collected in tandem over a four-month period and used to generate interferometric coherence, phase, and intensity products that we compared to a classified land cover coastal map of Big Bend, Florida. Forests displayed the highest intensity, and marshes the lowest. The intensity for fresh marsh and forests progressively shifted while saline marsh intensity variance di
Authors
Elijah W. Ramsey, Z. Lu, A. Rangoonwala, Russ Rykhus
Canopy reflectance related to marsh dieback onset and progression in Coastal Louisiana
In this study, we extended previous work linking leaf spectral changes, dieback onset, and progression of Spartina alterniflora marshes to changes in site-specific canopy reflectance spectra. First, we obtained canopy reflectance spectra (approximately 20 m ground resolution) from the marsh sites occupied during the leaf spectral analyses and from additional sites exhibiting visual signs of diebac
Authors
Elijah W. Ramsey, A. Rangoonwala