Elijah Ramsey, III, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 76
Mapping the change of Phragmites australis live biomass in the lower Mississippi River Delta marshes Mapping the change of Phragmites australis live biomass in the lower Mississippi River Delta marshes
Multiyear remote sensing mapping of the normalized difference vegetation index (NDVI) was carried out as an indicator of live biomass composition of the Phragmites australis (hereafter Phragmites) marsh in the lower Mississippi River Delta (hereafter delta) from 2014 to 2017. Maps of NDVI change showed that the Phragmites condition was fairly stable between May 2014 and July 2015. From...
Authors
Elijah W. Ramsey, Amina Rangoonwala
Operational shoreline mapping with high spatial resolution radar and geographic processing Operational shoreline mapping with high spatial resolution radar and geographic processing
A comprehensive mapping technology was developed utilizing standard image processing and available GIS procedures to automate shoreline identification and mapping from 2 m synthetic aperture radar (SAR) HH amplitude data. The development used four NASA Uninhabited Aerial Vehicle SAR (UAVSAR) data collections between summer 2009 and 2012 and a fall 2012 collection of wetlands dominantly...
Authors
Amina Rangoonwala, Cathleen E Jones, Zhaohui Chi, Elijah W. Ramsey
Marsh canopy structure changes and the Deepwater Horizon oil spill Marsh canopy structure changes and the Deepwater Horizon oil spill
Marsh canopy structure was mapped yearly from 2009 to 2012 in the Barataria Bay, Louisiana coastal region that was impacted by the 2010 Deepwater Horizon (DWH) oil spill. Based on the previously demonstrated capability of NASA's UAVSAR polarimetric synthetic aperture radar (PolSAR) image data to map Spartina alterniflora marsh canopy structure, structure maps combining the leaf area...
Authors
Elijah W. Ramsey, Amina Rangoonwala, Cathleen E. Jones
Wetland shoreline recession in the Mississippi River Delta from petroleum oiling and cyclonic storms Wetland shoreline recession in the Mississippi River Delta from petroleum oiling and cyclonic storms
We evaluate the relative impact of petroleum spill and storm surge on near-shore wetland loss by quantifying the lateral movement of coastal shores in upper Barataria Bay, Louisiana (USA), between June 2009 and October 2012, a study period that extends from the year prior to the Deepwater Horizon spill to 2.5 years following the spill. We document a distinctly different pattern of...
Authors
Amina Rangoonwala, Cathleen E. Jones, Elijah W. Ramsey
Response and resilience of Spartina alterniflora to sudden dieback Response and resilience of Spartina alterniflora to sudden dieback
We measured an array of biophysical and spectral variables to evaluate the response and recovery of Spartina alterniflora to a sudden dieback event in spring and summer 2004 within a low marsh in coastal Virginia, USA. S. alterniflora is a foundation species, whose loss decreases ecosystem services and potentiates ecosystem state change. Long-term records of the potential environmental...
Authors
Amanda Marsh, Linda K. Blum, Robert R. Christian, Elijah W. Ramsey, Amina Rangoonwala
Radar and optical mapping of surge persistence and marsh dieback along the New Jersey Mid-Atlantic coast after Hurricane Sandy Radar and optical mapping of surge persistence and marsh dieback along the New Jersey Mid-Atlantic coast after Hurricane Sandy
This study combined a radar-based time series of Hurricane Sandy surge and estimated persistence with optical sensor-based marsh condition change to assess potential causal linkages of surge persistence and marsh condition change along the New Jersey Atlantic Ocean coast. Results based on processed TerraSAR-X and COSMO-SkyMed synthetic aperture radar (SAR) images indicated that surge...
Authors
Amina Rangoonwala, Nicholas M. Enwright, Elijah W. Ramsey, Joseph P. Spruce
Science and Products
Filter Total Items: 76
Mapping the change of Phragmites australis live biomass in the lower Mississippi River Delta marshes Mapping the change of Phragmites australis live biomass in the lower Mississippi River Delta marshes
Multiyear remote sensing mapping of the normalized difference vegetation index (NDVI) was carried out as an indicator of live biomass composition of the Phragmites australis (hereafter Phragmites) marsh in the lower Mississippi River Delta (hereafter delta) from 2014 to 2017. Maps of NDVI change showed that the Phragmites condition was fairly stable between May 2014 and July 2015. From...
Authors
Elijah W. Ramsey, Amina Rangoonwala
Operational shoreline mapping with high spatial resolution radar and geographic processing Operational shoreline mapping with high spatial resolution radar and geographic processing
A comprehensive mapping technology was developed utilizing standard image processing and available GIS procedures to automate shoreline identification and mapping from 2 m synthetic aperture radar (SAR) HH amplitude data. The development used four NASA Uninhabited Aerial Vehicle SAR (UAVSAR) data collections between summer 2009 and 2012 and a fall 2012 collection of wetlands dominantly...
Authors
Amina Rangoonwala, Cathleen E Jones, Zhaohui Chi, Elijah W. Ramsey
Marsh canopy structure changes and the Deepwater Horizon oil spill Marsh canopy structure changes and the Deepwater Horizon oil spill
Marsh canopy structure was mapped yearly from 2009 to 2012 in the Barataria Bay, Louisiana coastal region that was impacted by the 2010 Deepwater Horizon (DWH) oil spill. Based on the previously demonstrated capability of NASA's UAVSAR polarimetric synthetic aperture radar (PolSAR) image data to map Spartina alterniflora marsh canopy structure, structure maps combining the leaf area...
Authors
Elijah W. Ramsey, Amina Rangoonwala, Cathleen E. Jones
Wetland shoreline recession in the Mississippi River Delta from petroleum oiling and cyclonic storms Wetland shoreline recession in the Mississippi River Delta from petroleum oiling and cyclonic storms
We evaluate the relative impact of petroleum spill and storm surge on near-shore wetland loss by quantifying the lateral movement of coastal shores in upper Barataria Bay, Louisiana (USA), between June 2009 and October 2012, a study period that extends from the year prior to the Deepwater Horizon spill to 2.5 years following the spill. We document a distinctly different pattern of...
Authors
Amina Rangoonwala, Cathleen E. Jones, Elijah W. Ramsey
Response and resilience of Spartina alterniflora to sudden dieback Response and resilience of Spartina alterniflora to sudden dieback
We measured an array of biophysical and spectral variables to evaluate the response and recovery of Spartina alterniflora to a sudden dieback event in spring and summer 2004 within a low marsh in coastal Virginia, USA. S. alterniflora is a foundation species, whose loss decreases ecosystem services and potentiates ecosystem state change. Long-term records of the potential environmental...
Authors
Amanda Marsh, Linda K. Blum, Robert R. Christian, Elijah W. Ramsey, Amina Rangoonwala
Radar and optical mapping of surge persistence and marsh dieback along the New Jersey Mid-Atlantic coast after Hurricane Sandy Radar and optical mapping of surge persistence and marsh dieback along the New Jersey Mid-Atlantic coast after Hurricane Sandy
This study combined a radar-based time series of Hurricane Sandy surge and estimated persistence with optical sensor-based marsh condition change to assess potential causal linkages of surge persistence and marsh condition change along the New Jersey Atlantic Ocean coast. Results based on processed TerraSAR-X and COSMO-SkyMed synthetic aperture radar (SAR) images indicated that surge...
Authors
Amina Rangoonwala, Nicholas M. Enwright, Elijah W. Ramsey, Joseph P. Spruce