Page Spencer - Academia.edu (original) (raw)
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Universidad Nacional del Centro de la Provincia de Buenos Aires
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Papers by Page Spencer
Thesis (Ph.D.) University of Alaska Fairbanks, 1981A technique for collecting and recording refer... more Thesis (Ph.D.) University of Alaska Fairbanks, 1981A technique for collecting and recording reference data which considers the spectral and spatial characteristics of Landsat data, the computer system being used, and the gradient nature of wildland vegetation was developed and described. Different analysis techniques for four critical factors affecting the accuracy of computer-aided analysis products were evaluated. Comparisons were made on the basis of accuracy evaluations of two methods of data/analyst interface, three methods of deriving training statistics, three methods of spectral class descriptions, and two levels of map category detail. The primary data set used was digital Landsat multispectral data for a study area around Fairbanks, Alaska. Reference data were developed from field work and photo-interpretation. The training methods compared were supervised, unsupervised, and modified clustering. The three spectral class description methods were: (1) labels derived from the...
Remote Sensing of Environment, 2009
The National Park Service's (NPS) Inventory and Monitoring (I&M) Program was established, in... more The National Park Service's (NPS) Inventory and Monitoring (I&M) Program was established, in part, to describe long-term trends in ecosystem properties. The Southwest Alaska Network (SWAN) of parks, one of 32 networks in the I&M Program, is using Moderate Resolution Imaging Spectroradiometer (MODIS) data to measure the following metrics: 1) onset of ice formation and break up on large freshwater lakes, 2) timing and extent of snow cover, and 3) vegetation phenology. Remote sensing specialists with the U.S. Geological Survey (USGS), in cooperation with NPS-SWAN ecologists, have developed a set of protocols for acquiring, processing, and analyzing MODIS data. Season-dependent landscape processes are interpreted and analyzed using standard MODIS products including daily calibrated top-of-the-atmosphere radiance, snow cover extent, and vegetation index data. The timing and duration of seasonal landscape processes are reported for each of the metrics and are coupled with other data ...
arlis.org
The major drivers of Kenai Fjords ecosystems are tectonics and climate. In this overview, we desc... more The major drivers of Kenai Fjords ecosystems are tectonics and climate. In this overview, we describe how these forces have contributed to the shaping of the lands and ecosystems of Kenai Fjords. Physically, the park is comprised of several distinct components, set within a ...
Thesis (Ph.D.) University of Alaska Fairbanks, 1981A technique for collecting and recording refer... more Thesis (Ph.D.) University of Alaska Fairbanks, 1981A technique for collecting and recording reference data which considers the spectral and spatial characteristics of Landsat data, the computer system being used, and the gradient nature of wildland vegetation was developed and described. Different analysis techniques for four critical factors affecting the accuracy of computer-aided analysis products were evaluated. Comparisons were made on the basis of accuracy evaluations of two methods of data/analyst interface, three methods of deriving training statistics, three methods of spectral class descriptions, and two levels of map category detail. The primary data set used was digital Landsat multispectral data for a study area around Fairbanks, Alaska. Reference data were developed from field work and photo-interpretation. The training methods compared were supervised, unsupervised, and modified clustering. The three spectral class description methods were: (1) labels derived from the...
Remote Sensing of Environment, 2009
The National Park Service's (NPS) Inventory and Monitoring (I&M) Program was established, in... more The National Park Service's (NPS) Inventory and Monitoring (I&M) Program was established, in part, to describe long-term trends in ecosystem properties. The Southwest Alaska Network (SWAN) of parks, one of 32 networks in the I&M Program, is using Moderate Resolution Imaging Spectroradiometer (MODIS) data to measure the following metrics: 1) onset of ice formation and break up on large freshwater lakes, 2) timing and extent of snow cover, and 3) vegetation phenology. Remote sensing specialists with the U.S. Geological Survey (USGS), in cooperation with NPS-SWAN ecologists, have developed a set of protocols for acquiring, processing, and analyzing MODIS data. Season-dependent landscape processes are interpreted and analyzed using standard MODIS products including daily calibrated top-of-the-atmosphere radiance, snow cover extent, and vegetation index data. The timing and duration of seasonal landscape processes are reported for each of the metrics and are coupled with other data ...
arlis.org
The major drivers of Kenai Fjords ecosystems are tectonics and climate. In this overview, we desc... more The major drivers of Kenai Fjords ecosystems are tectonics and climate. In this overview, we describe how these forces have contributed to the shaping of the lands and ecosystems of Kenai Fjords. Physically, the park is comprised of several distinct components, set within a ...