Elijah Ramsey, III, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 76
Generation and validation of characteristic spectra from EO1 Hyperion image data for detecting the occurrence of the invasive species, Chinese tallow Generation and validation of characteristic spectra from EO1 Hyperion image data for detecting the occurrence of the invasive species, Chinese tallow
Chinese tallow (Triadica sebifera) is an invasive tree that is spreading throughout the south-eastern United States and now into the west, and in many places causing extensive change to native habitat and associated wildlife. Detecting and mapping the relative distribution of this species is important to its control and eradication. To map the relative distribution of Chinese tallow...
Authors
Elijah W. Ramsey, A. Rangoonwala, G. Nelson, R. Ehrlich, K. Martella
A whole image approach using field measurements for transforming EO1 Hyperion hyperspectral data into canopy reflectance spectra A whole image approach using field measurements for transforming EO1 Hyperion hyperspectral data into canopy reflectance spectra
To maximize the spectral distinctiveness (information) of the canopy reflectance, an atmospheric correction strategy was implemented to provide accurate estimates of the intrinsic reflectance from the Earth Observing 1 (EO1) satellite Hyperion sensor signal. In rendering the canopy reflectance, an estimate of optical depth derived from a measurement of downwelling irradiance was used to...
Authors
Elijah W. Ramsey, G. Nelson
Light attenuation profiling as an indicator of structural changes in coastal marshes Light attenuation profiling as an indicator of structural changes in coastal marshes
To best respond to natural and human-induced stresses, resource managers and researchers require remote sensing techniques that can map the biophysical characteristics of natural resources on regional and local scales. The implementation of advanced measurement techniques would provide significant improvements in the quantity, quality, and timeliness of biophysical data useful in...
Authors
Elijah Ramsey III, Gene Nelson, Frank Baarnes, R. Spell
Remote sensing and the optical properties of the narrow cylindrical leaves of Juncus roemerianus Remote sensing and the optical properties of the narrow cylindrical leaves of Juncus roemerianus
To develop a more complete foundation for remote sensing of the marsh grass Juncus roemerianus, we measured the optical properties of its cylindrical leaves at sites of different canopy height, biomass composition and amount, and connectivity to ocean flushing. To measure the leaf optical properties, we adapted a technique used for conifer needles. After establishing the reliability and...
Authors
Elijah W. Ramsey, A. Rangoonwala
Mapping Chinese tallow with color-infrared photography Mapping Chinese tallow with color-infrared photography
Airborne color-infrared photography (CIR) (1:12,000 scale) was used to map localized occurrences of the widespread and aggressive Chinese tallow (Sapium sebiferum), an invasive species. Photography was collected during senescence when Chinese tallow's bright red leaves presented a high spectral contrast within the native bottomland hardwood and upland forests and marsh land-cover types...
Authors
Elijah W. Ramsey, G.A. Nelson, S.K. Sapkota, E.B. Seeger, K.D. Martella
The National Vegetation Classification Standard applied to the remote sensing classification of two semiarid environments The National Vegetation Classification Standard applied to the remote sensing classification of two semiarid environments
The National Vegetation Classification Standard (NVCS) was implemented at two US National Park Service (NPS) sites in Texas, the Padre Island National Seashore (PINS) and the Lake Meredith National Recreation Area (LM-NRA), to provide information for NPS oil and gas management plans. Because NVCS landcover classifications did not exist for these two areas prior to this study, we created...
Authors
Elijah W. Ramsey, G.A. Nelson, D. Echols, S.K. Sapkota
Science and Products
Filter Total Items: 76
Generation and validation of characteristic spectra from EO1 Hyperion image data for detecting the occurrence of the invasive species, Chinese tallow Generation and validation of characteristic spectra from EO1 Hyperion image data for detecting the occurrence of the invasive species, Chinese tallow
Chinese tallow (Triadica sebifera) is an invasive tree that is spreading throughout the south-eastern United States and now into the west, and in many places causing extensive change to native habitat and associated wildlife. Detecting and mapping the relative distribution of this species is important to its control and eradication. To map the relative distribution of Chinese tallow...
Authors
Elijah W. Ramsey, A. Rangoonwala, G. Nelson, R. Ehrlich, K. Martella
A whole image approach using field measurements for transforming EO1 Hyperion hyperspectral data into canopy reflectance spectra A whole image approach using field measurements for transforming EO1 Hyperion hyperspectral data into canopy reflectance spectra
To maximize the spectral distinctiveness (information) of the canopy reflectance, an atmospheric correction strategy was implemented to provide accurate estimates of the intrinsic reflectance from the Earth Observing 1 (EO1) satellite Hyperion sensor signal. In rendering the canopy reflectance, an estimate of optical depth derived from a measurement of downwelling irradiance was used to...
Authors
Elijah W. Ramsey, G. Nelson
Light attenuation profiling as an indicator of structural changes in coastal marshes Light attenuation profiling as an indicator of structural changes in coastal marshes
To best respond to natural and human-induced stresses, resource managers and researchers require remote sensing techniques that can map the biophysical characteristics of natural resources on regional and local scales. The implementation of advanced measurement techniques would provide significant improvements in the quantity, quality, and timeliness of biophysical data useful in...
Authors
Elijah Ramsey III, Gene Nelson, Frank Baarnes, R. Spell
Remote sensing and the optical properties of the narrow cylindrical leaves of Juncus roemerianus Remote sensing and the optical properties of the narrow cylindrical leaves of Juncus roemerianus
To develop a more complete foundation for remote sensing of the marsh grass Juncus roemerianus, we measured the optical properties of its cylindrical leaves at sites of different canopy height, biomass composition and amount, and connectivity to ocean flushing. To measure the leaf optical properties, we adapted a technique used for conifer needles. After establishing the reliability and...
Authors
Elijah W. Ramsey, A. Rangoonwala
Mapping Chinese tallow with color-infrared photography Mapping Chinese tallow with color-infrared photography
Airborne color-infrared photography (CIR) (1:12,000 scale) was used to map localized occurrences of the widespread and aggressive Chinese tallow (Sapium sebiferum), an invasive species. Photography was collected during senescence when Chinese tallow's bright red leaves presented a high spectral contrast within the native bottomland hardwood and upland forests and marsh land-cover types...
Authors
Elijah W. Ramsey, G.A. Nelson, S.K. Sapkota, E.B. Seeger, K.D. Martella
The National Vegetation Classification Standard applied to the remote sensing classification of two semiarid environments The National Vegetation Classification Standard applied to the remote sensing classification of two semiarid environments
The National Vegetation Classification Standard (NVCS) was implemented at two US National Park Service (NPS) sites in Texas, the Padre Island National Seashore (PINS) and the Lake Meredith National Recreation Area (LM-NRA), to provide information for NPS oil and gas management plans. Because NVCS landcover classifications did not exist for these two areas prior to this study, we created...
Authors
Elijah W. Ramsey, G.A. Nelson, D. Echols, S.K. Sapkota