Elijah Ramsey, III, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 76
Marsh canopy leaf area and orientation calculated for improved marsh structure mapping
An approach is presented for producing the spatiotemporal estimation of leaf area index (LAI) of a highly heterogeneous coastal marsh without reliance on user estimates of marsh leaf-stem orientation. The canopy LAI profile derivation used three years of field measured photosynthetically active radiation (PAR) vertical profiles at seven S. alterniflora marsh sites and iterative transform of those
Authors
Elijah W. Ramsey, Amina Rangoonwala, Cathleen E. Jones, Terri Bannister
Structural classification of marshes with Polarimetric SAR highlighting the temporal mapping of marshes exposed to oil
Empirical relationships between field-derived Leaf Area Index (LAI) and Leaf Angle Distribution (LAD) and polarimetric synthetic aperture radar (PolSAR) based biophysical indicators were created and applied to map S. alterniflora marsh canopy structure. PolSAR and field data were collected near concurrently in the summers of 2010, 2011, and 2012 in coastal marshes, and PolSAR data alone were acqui
Authors
Elijah W. Ramsey, Amina Rangoonwala, Cathleen E. Jones
Radar and optical image fusion and mapping of land cover and wetland resources
No abstract available.
Authors
Elijah W. Ramsey, Amina Rangoonwala
Oil source-fingerprinting in support of polarimetric radar mapping of Macondo-252 oil in Gulf Coast marshes
Polarimetric synthetic aperture radar (PolSAR) data exhibited dramatic, spatially extensive changes from June 2009 to June 2010 in Barataria Bay, Louisiana. To determine whether these changes were associated with the Deepwater Horizon (DWH) oil spill, twenty-nine sediment samples were collected in 2011 from shoreline and nearshore–interior coastal marsh locations where oil was not observed visuall
Authors
Elijah W. Ramsey, Buffy M. Meyer, Amina Rangoonwala, Edward Overton, Cathleen E. Jones, Terri Bannister
Marsh dieback, loss, and recovery mapped with satellite optical, airborne polarimetric radar, and field data
Landsat Thematic Mapper and Satellite Pour l'Observation de la Terre (SPOT) satellite based optical sensors, NASA Uninhabited Aerial Vehicle synthetic aperture radar (UAVSAR) polarimetric SAR (PolSAR), and field data captured the occurrence and the recovery of an undetected dieback that occurred between the summers of 2010, 2011, and 2012 in the Spartina alterniflora marshes of coastal Louisiana.
Authors
Elijah W. Ramsey, Amina Rangoonwala, Zhaohui Chi, Cathleen E. Jones, Terri Bannister
Coastal flood inundation monitoring with Satellite C-band and L-band Synthetic Aperture Radar data
Satellite Synthetic Aperture Radar (SAR) was evaluated as a method to operationally monitor the occurrence and distribution of storm- and tidal-related flooding of spatially extensive coastal marshes within the north-central Gulf of Mexico. Maps representing the occurrence of marsh surface inundation were created from available Advanced Land Observation Satellite (ALOS) Phased Array type L-Band SA
Authors
Elijah W. Ramsey, Amina Rangoonwala, Terri Bannister
Remote sensing survey of Chinese tallow tree in the Toledo Bend Reservoir area, Louisiana and Texas
We applied Hyperion sensor satellite data acquired by the National Aeronautics and Space Administration’s Earth Observing-1 (EO-1) satellite in conjunction with reconnaissance surveys to map the occurrences of the invasive Chinese tallow tree (Triadica sebifera) in the Toledo Bend Reservoir study area of northwestern Louisiana and northeastern Texas. The rationale for application of high spectral
Authors
Elijah W. Ramsey, Amina Rangoonwala, Terri Bannister, Yukihiro Suzuoki
Limitations and potential of satellite imagery to monitor environmental response to coastal flooding
Storm-surge flooding and marsh response throughout the coastal wetlands of Louisiana were mapped using several types of remote sensing data collected before and after Hurricanes Gustav and Ike in 2008. These included synthetic aperture radar (SAR) data obtained from the (1) C-band advance SAR (ASAR) aboard the Environmental Satellite, (2) phased-array type L-band SAR (PALSAR) aboard the Advanced L
Authors
Elijah W. Ramsey, Dirk Werle, Yukihiro Suzuoki, Amina Rangoonwala, Zhong Lu
Flat-plate techniques for measuring reflectance of macro-algae (Ulva curvata)
We tested the consistency and accuracy of flat-plate spectral measurements (400–1000 nm) of the marine macrophyte Ulva curvata. With sequential addition of Ulva thallus layers, the reflectance progressively increased from 6% to 9% with six thalli in the visible (VIS) and from 5% to 19% with ten thalli in the near infrared (NIR). This progressive increase was simulated by a mathematical calculation
Authors
Elijah W. Ramsey, Amina Rangoonwala, Mads Solgaard Thomsen, Arthur Schwarzschild
Spectral definition of the macro-algae Ulva curvata in the back-barrier bays of the Eastern Shore of Virginia, USA
We have developed methods to determine the visible (VIS) to near-infrared (NIR) spectral properties of thalli and epiphytes of bloom-forming and green macrophyte Ulva curvata in back-barrier lagoons in Virginia, USA. A 2% increase in NIR thalli reflectance from winter to summer (ca. 9.5%) matched the drop in summer NIR transmittance (ca. 90%). In contrast, summer and winter VIS reflectance (reachi
Authors
E. Ramsey, A. Rangoonwalaj, M.S. Thomsen, A. Schwarzschild
Hyperspectral remote sensing of wetland vegetation
Wetlands proportionally exert a higher influence on biogeochemical fluxes among the land, the atmosphere, and hydrologic systems than their 1% worldwide occurrence suggests [1]. Although their frequency of occurrence is low and their importance is high, wetlands continue to face high detrimental pressures from natural and human-induced forces [2]. Remote sensing offers the single best source of ti
Authors
Elijah Ramsey III, Amina Rangoonwala
Mapping the Natchez Trace Parkway
Based on a National Park Service (NPS) landcover classification, a landcover map of the 715-km (444-mile) NPS Natchez Trace Parkway (hereafter referred to as the "Parkway") was created. The NPS landcover classification followed National Vegetation Classification (NVC) protocols. The landcover map, which extended the initial landcover classification to the entire Parkway, was based on color-infrare
Authors
Amina Rangoonwala, Terri Bannister, Elijah W. Ramsey
Science and Products
Filter Total Items: 76
Marsh canopy leaf area and orientation calculated for improved marsh structure mapping
An approach is presented for producing the spatiotemporal estimation of leaf area index (LAI) of a highly heterogeneous coastal marsh without reliance on user estimates of marsh leaf-stem orientation. The canopy LAI profile derivation used three years of field measured photosynthetically active radiation (PAR) vertical profiles at seven S. alterniflora marsh sites and iterative transform of those
Authors
Elijah W. Ramsey, Amina Rangoonwala, Cathleen E. Jones, Terri Bannister
Structural classification of marshes with Polarimetric SAR highlighting the temporal mapping of marshes exposed to oil
Empirical relationships between field-derived Leaf Area Index (LAI) and Leaf Angle Distribution (LAD) and polarimetric synthetic aperture radar (PolSAR) based biophysical indicators were created and applied to map S. alterniflora marsh canopy structure. PolSAR and field data were collected near concurrently in the summers of 2010, 2011, and 2012 in coastal marshes, and PolSAR data alone were acqui
Authors
Elijah W. Ramsey, Amina Rangoonwala, Cathleen E. Jones
Radar and optical image fusion and mapping of land cover and wetland resources
No abstract available.
Authors
Elijah W. Ramsey, Amina Rangoonwala
Oil source-fingerprinting in support of polarimetric radar mapping of Macondo-252 oil in Gulf Coast marshes
Polarimetric synthetic aperture radar (PolSAR) data exhibited dramatic, spatially extensive changes from June 2009 to June 2010 in Barataria Bay, Louisiana. To determine whether these changes were associated with the Deepwater Horizon (DWH) oil spill, twenty-nine sediment samples were collected in 2011 from shoreline and nearshore–interior coastal marsh locations where oil was not observed visuall
Authors
Elijah W. Ramsey, Buffy M. Meyer, Amina Rangoonwala, Edward Overton, Cathleen E. Jones, Terri Bannister
Marsh dieback, loss, and recovery mapped with satellite optical, airborne polarimetric radar, and field data
Landsat Thematic Mapper and Satellite Pour l'Observation de la Terre (SPOT) satellite based optical sensors, NASA Uninhabited Aerial Vehicle synthetic aperture radar (UAVSAR) polarimetric SAR (PolSAR), and field data captured the occurrence and the recovery of an undetected dieback that occurred between the summers of 2010, 2011, and 2012 in the Spartina alterniflora marshes of coastal Louisiana.
Authors
Elijah W. Ramsey, Amina Rangoonwala, Zhaohui Chi, Cathleen E. Jones, Terri Bannister
Coastal flood inundation monitoring with Satellite C-band and L-band Synthetic Aperture Radar data
Satellite Synthetic Aperture Radar (SAR) was evaluated as a method to operationally monitor the occurrence and distribution of storm- and tidal-related flooding of spatially extensive coastal marshes within the north-central Gulf of Mexico. Maps representing the occurrence of marsh surface inundation were created from available Advanced Land Observation Satellite (ALOS) Phased Array type L-Band SA
Authors
Elijah W. Ramsey, Amina Rangoonwala, Terri Bannister
Remote sensing survey of Chinese tallow tree in the Toledo Bend Reservoir area, Louisiana and Texas
We applied Hyperion sensor satellite data acquired by the National Aeronautics and Space Administration’s Earth Observing-1 (EO-1) satellite in conjunction with reconnaissance surveys to map the occurrences of the invasive Chinese tallow tree (Triadica sebifera) in the Toledo Bend Reservoir study area of northwestern Louisiana and northeastern Texas. The rationale for application of high spectral
Authors
Elijah W. Ramsey, Amina Rangoonwala, Terri Bannister, Yukihiro Suzuoki
Limitations and potential of satellite imagery to monitor environmental response to coastal flooding
Storm-surge flooding and marsh response throughout the coastal wetlands of Louisiana were mapped using several types of remote sensing data collected before and after Hurricanes Gustav and Ike in 2008. These included synthetic aperture radar (SAR) data obtained from the (1) C-band advance SAR (ASAR) aboard the Environmental Satellite, (2) phased-array type L-band SAR (PALSAR) aboard the Advanced L
Authors
Elijah W. Ramsey, Dirk Werle, Yukihiro Suzuoki, Amina Rangoonwala, Zhong Lu
Flat-plate techniques for measuring reflectance of macro-algae (Ulva curvata)
We tested the consistency and accuracy of flat-plate spectral measurements (400–1000 nm) of the marine macrophyte Ulva curvata. With sequential addition of Ulva thallus layers, the reflectance progressively increased from 6% to 9% with six thalli in the visible (VIS) and from 5% to 19% with ten thalli in the near infrared (NIR). This progressive increase was simulated by a mathematical calculation
Authors
Elijah W. Ramsey, Amina Rangoonwala, Mads Solgaard Thomsen, Arthur Schwarzschild
Spectral definition of the macro-algae Ulva curvata in the back-barrier bays of the Eastern Shore of Virginia, USA
We have developed methods to determine the visible (VIS) to near-infrared (NIR) spectral properties of thalli and epiphytes of bloom-forming and green macrophyte Ulva curvata in back-barrier lagoons in Virginia, USA. A 2% increase in NIR thalli reflectance from winter to summer (ca. 9.5%) matched the drop in summer NIR transmittance (ca. 90%). In contrast, summer and winter VIS reflectance (reachi
Authors
E. Ramsey, A. Rangoonwalaj, M.S. Thomsen, A. Schwarzschild
Hyperspectral remote sensing of wetland vegetation
Wetlands proportionally exert a higher influence on biogeochemical fluxes among the land, the atmosphere, and hydrologic systems than their 1% worldwide occurrence suggests [1]. Although their frequency of occurrence is low and their importance is high, wetlands continue to face high detrimental pressures from natural and human-induced forces [2]. Remote sensing offers the single best source of ti
Authors
Elijah Ramsey III, Amina Rangoonwala
Mapping the Natchez Trace Parkway
Based on a National Park Service (NPS) landcover classification, a landcover map of the 715-km (444-mile) NPS Natchez Trace Parkway (hereafter referred to as the "Parkway") was created. The NPS landcover classification followed National Vegetation Classification (NVC) protocols. The landcover map, which extended the initial landcover classification to the entire Parkway, was based on color-infrare
Authors
Amina Rangoonwala, Terri Bannister, Elijah W. Ramsey