E. Lynn Usery (Former Employee)
Science and Products
Filter Total Items: 60
A decision support system for map projections of small scale data A decision support system for map projections of small scale data
The use of commercial geographic information system software to process large raster datasets of terrain elevation, population, land cover, vegetation, soils, temperature, and rainfall requires both projection from spherical coordinates to plane coordinate systems and transformation from one plane system to another. Decision support systems deliver information resulting in knowledge that...
Authors
Michael P. Finn, E. Lynn Usery, Stephan T. Posch, Jeong Chang Seong
Geospatial data resampling and resolution effects on watershed modeling: A case study using the agricultural non-point source pollution model Geospatial data resampling and resolution effects on watershed modeling: A case study using the agricultural non-point source pollution model
Researchers have been coupling geographic information systems (GIS) data handling and processing capability to watershed and waterquality models for many years. This capability is suited for the development of databases appropriate for water modeling. However, it is rare for GIS to provide direct inputs to the models. To demonstrate the logical procedure of coupling GIS for model...
Authors
E.L. Usery, M.P. Finn, Daniel J. Scheidt, S. Ruhl, T. Beard, M. Bearden
Projecting global datasets to achieve equal areas Projecting global datasets to achieve equal areas
Scientists routinely accomplish global modeling in the raster domain, but recent research has indicated that the transformation of large areas through map projection equations leads to errors. This research attempts to gauge the extent of map projection and resampling effects on the tabulation of categorical areas by comparing the results of three datasets for seven common projections...
Authors
E.L. Usery, M.P. Finn, J.D. Cox, T. Beard, S. Ruhl, M. Bearden
Methods to achieve accurate projection of regional and global raster databases Methods to achieve accurate projection of regional and global raster databases
This research aims at building a decision support system (DSS) for selecting an optimum projection considering various factors, such as pixel size, areal extent, number of categories, spatial pattern of categories, resampling methods, and error correction methods. Specifically, this research will investigate three goals theoretically and empirically and, using the already developed...
Authors
E.L. Usery, J.C. Seong, D.R. Steinwand, M.P. Finn
Methods to achieve accurate projection of regional and global raster databases Methods to achieve accurate projection of regional and global raster databases
Modeling regional and global activities of climatic and human-induced change requires accurate geographic data from which we can develop mathematical and statistical tabulations of attributes and properties of the environment. Many of these models depend on data formatted as raster cells or matrices of pixel values. Recently, it has been demonstrated that regional and global raster...
Authors
E. Lynn Usery, Jeong Chang Seong, Dan Steinwand
MAUP: Modifiable Areal Unit Problem in raster GIS datasets. Raster pixels as modifiable areas MAUP: Modifiable Areal Unit Problem in raster GIS datasets. Raster pixels as modifiable areas
The Modifiable Areal Unit Problem (MAUP) is a well-studied aspect of geographic phenomena. It is usually associated with socio-economic data collected by census enumeration units. This problem also applies directly to geographic data in raster formats, including both GIS categorical data layers and remotely sensed images. The author briefly provides a foundation for examining the...
Authors
Usery E. Lyn
Science and Products
Filter Total Items: 60
A decision support system for map projections of small scale data A decision support system for map projections of small scale data
The use of commercial geographic information system software to process large raster datasets of terrain elevation, population, land cover, vegetation, soils, temperature, and rainfall requires both projection from spherical coordinates to plane coordinate systems and transformation from one plane system to another. Decision support systems deliver information resulting in knowledge that...
Authors
Michael P. Finn, E. Lynn Usery, Stephan T. Posch, Jeong Chang Seong
Geospatial data resampling and resolution effects on watershed modeling: A case study using the agricultural non-point source pollution model Geospatial data resampling and resolution effects on watershed modeling: A case study using the agricultural non-point source pollution model
Researchers have been coupling geographic information systems (GIS) data handling and processing capability to watershed and waterquality models for many years. This capability is suited for the development of databases appropriate for water modeling. However, it is rare for GIS to provide direct inputs to the models. To demonstrate the logical procedure of coupling GIS for model...
Authors
E.L. Usery, M.P. Finn, Daniel J. Scheidt, S. Ruhl, T. Beard, M. Bearden
Projecting global datasets to achieve equal areas Projecting global datasets to achieve equal areas
Scientists routinely accomplish global modeling in the raster domain, but recent research has indicated that the transformation of large areas through map projection equations leads to errors. This research attempts to gauge the extent of map projection and resampling effects on the tabulation of categorical areas by comparing the results of three datasets for seven common projections...
Authors
E.L. Usery, M.P. Finn, J.D. Cox, T. Beard, S. Ruhl, M. Bearden
Methods to achieve accurate projection of regional and global raster databases Methods to achieve accurate projection of regional and global raster databases
This research aims at building a decision support system (DSS) for selecting an optimum projection considering various factors, such as pixel size, areal extent, number of categories, spatial pattern of categories, resampling methods, and error correction methods. Specifically, this research will investigate three goals theoretically and empirically and, using the already developed...
Authors
E.L. Usery, J.C. Seong, D.R. Steinwand, M.P. Finn
Methods to achieve accurate projection of regional and global raster databases Methods to achieve accurate projection of regional and global raster databases
Modeling regional and global activities of climatic and human-induced change requires accurate geographic data from which we can develop mathematical and statistical tabulations of attributes and properties of the environment. Many of these models depend on data formatted as raster cells or matrices of pixel values. Recently, it has been demonstrated that regional and global raster...
Authors
E. Lynn Usery, Jeong Chang Seong, Dan Steinwand
MAUP: Modifiable Areal Unit Problem in raster GIS datasets. Raster pixels as modifiable areas MAUP: Modifiable Areal Unit Problem in raster GIS datasets. Raster pixels as modifiable areas
The Modifiable Areal Unit Problem (MAUP) is a well-studied aspect of geographic phenomena. It is usually associated with socio-economic data collected by census enumeration units. This problem also applies directly to geographic data in raster formats, including both GIS categorical data layers and remotely sensed images. The author briefly provides a foundation for examining the...
Authors
Usery E. Lyn