Elijah Ramsey, III, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 76
Generation of coastal marsh topography with radar and ground-based measurements
A topographic surface of a low lying coastal marsh was created by using three flood extent vectors digitized from ERS-1 SAR images and two elevation contours from U.S. Geological Survey topographic quadrangles. Point measurement of water depth at the times of the SAR collections allowed conversion of the radar measured flood extent vectors to topographic contours. Generation of the topographic sur
Authors
Elijah W. Ramsey, G.A. Nelson, S.C. Laine, R.G. Kirkman, W. Topham
AVHRR imagery used to identify hurricane damage in a forested wetland of Louisiana
Certain events provide a unique opportunity to test the monitoring capability of AVHBR imagery. On 26 August 1992, Hurricane Andrew passed through Louisiana, impacting a large area of forested wetlands. One response to the widespread defoliation resulting from the hurricane impact was an abnormal bloom of new leaves and new growth in the underlying vegetation between September and October. To capt
Authors
Elijah W. Ramsey, D.K. Chappell, D.G. Baldwin
Using remote sensing to monitor global change
To properly respond to natural and human-induced stresses to wetlands, resource managers must consider their functions and values. Remote sensing is an important tool for monitoring wetland responses to changes in the hydrologic regime and water quality caused by global climate change and sea-level rise.
Authors
Elijah W. Ramsey
Remote sensing of mangrove wetlands: Relating canopy spectra to site-specific data
No abstract available.
Authors
Elijah Ramsey III, John R. Jensen
Wetlands, global climate change, and remote sensing
No abstract available.
Authors
Elijah Ramsey III
Modeling mangrove canopy reflectance using a light interaction model and an optimization technique
At 20 sites, incorporating mixtures of black, red, and white mangroves, canopy reflectance spectra were derived from high resolution spectral data taken from a helicopter platform. Canopy characteristics were predicted from the canopy reflectance spectra by using measured and estimated data as inputs into a light-canopy interaction model within a optimization routine. Pertinent to average conditio
Authors
Elijah Ramsey III, John R. Jensen
Monitoring flooding in coastal wetlands by using radar imagery and ground-based measurements
Satellite radar was used in a Florida Juncus roemerianus marsh to map tidal flooding, a critical control of coastal vegetation distribution. Radar images taken during a time of near-continuous recordings of ground-based hydrology measurements directly linked marsh flooding to lowered radar returns and indicated a negative covariation between flood frequency and radar return. Flood-extent contours
Authors
Elijah Ramsey
Monitoring Hurricane Andrew damage and recovery of the coastal Louisiana marsh using satellite remote sensing data
No abstract available.
Authors
Elijah Ramsey III, S. Laine, Dirk Werle, Brian Tittley, David Lapp
National wetlands research center uses visual true color classification in waterfowl habitat mapping
No abstract available.
Authors
Elijah Ramsey III, Steve Hartley
Spectral reflectance and canopy structure characteristics of gulf coast wetland vegetation types
Field measurements of canopy structure and species composition are related to spectral reflectance measurements taken with a radiometer over a number of marsh sites. Marsh vegetation types are discussed in terms of their characteristic canopy structure and phenology; the influence of these characteristics on spectral reflectance will be examined. Vegetation types that are discussed include Panicum
Authors
R. Spell, Elijah W. Ramsey III
Preliminary analysis of spectral data collected for the purpose of wetland discrimination
No abstract available.
Authors
Elijah Ramsey III, R. Spell, James B. Johnston
Science and Products
Filter Total Items: 76
Generation of coastal marsh topography with radar and ground-based measurements
A topographic surface of a low lying coastal marsh was created by using three flood extent vectors digitized from ERS-1 SAR images and two elevation contours from U.S. Geological Survey topographic quadrangles. Point measurement of water depth at the times of the SAR collections allowed conversion of the radar measured flood extent vectors to topographic contours. Generation of the topographic sur
Authors
Elijah W. Ramsey, G.A. Nelson, S.C. Laine, R.G. Kirkman, W. Topham
AVHRR imagery used to identify hurricane damage in a forested wetland of Louisiana
Certain events provide a unique opportunity to test the monitoring capability of AVHBR imagery. On 26 August 1992, Hurricane Andrew passed through Louisiana, impacting a large area of forested wetlands. One response to the widespread defoliation resulting from the hurricane impact was an abnormal bloom of new leaves and new growth in the underlying vegetation between September and October. To capt
Authors
Elijah W. Ramsey, D.K. Chappell, D.G. Baldwin
Using remote sensing to monitor global change
To properly respond to natural and human-induced stresses to wetlands, resource managers must consider their functions and values. Remote sensing is an important tool for monitoring wetland responses to changes in the hydrologic regime and water quality caused by global climate change and sea-level rise.
Authors
Elijah W. Ramsey
Remote sensing of mangrove wetlands: Relating canopy spectra to site-specific data
No abstract available.
Authors
Elijah Ramsey III, John R. Jensen
Wetlands, global climate change, and remote sensing
No abstract available.
Authors
Elijah Ramsey III
Modeling mangrove canopy reflectance using a light interaction model and an optimization technique
At 20 sites, incorporating mixtures of black, red, and white mangroves, canopy reflectance spectra were derived from high resolution spectral data taken from a helicopter platform. Canopy characteristics were predicted from the canopy reflectance spectra by using measured and estimated data as inputs into a light-canopy interaction model within a optimization routine. Pertinent to average conditio
Authors
Elijah Ramsey III, John R. Jensen
Monitoring flooding in coastal wetlands by using radar imagery and ground-based measurements
Satellite radar was used in a Florida Juncus roemerianus marsh to map tidal flooding, a critical control of coastal vegetation distribution. Radar images taken during a time of near-continuous recordings of ground-based hydrology measurements directly linked marsh flooding to lowered radar returns and indicated a negative covariation between flood frequency and radar return. Flood-extent contours
Authors
Elijah Ramsey
Monitoring Hurricane Andrew damage and recovery of the coastal Louisiana marsh using satellite remote sensing data
No abstract available.
Authors
Elijah Ramsey III, S. Laine, Dirk Werle, Brian Tittley, David Lapp
National wetlands research center uses visual true color classification in waterfowl habitat mapping
No abstract available.
Authors
Elijah Ramsey III, Steve Hartley
Spectral reflectance and canopy structure characteristics of gulf coast wetland vegetation types
Field measurements of canopy structure and species composition are related to spectral reflectance measurements taken with a radiometer over a number of marsh sites. Marsh vegetation types are discussed in terms of their characteristic canopy structure and phenology; the influence of these characteristics on spectral reflectance will be examined. Vegetation types that are discussed include Panicum
Authors
R. Spell, Elijah W. Ramsey III
Preliminary analysis of spectral data collected for the purpose of wetland discrimination
No abstract available.
Authors
Elijah Ramsey III, R. Spell, James B. Johnston