E. Lynn Usery (Former Employee)
Science and Products
Filter Total Items: 59
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 assists i
Authors
Michael P. Finn, E. Lynn Usery, Stephan T. Posch, Jeong Chang Seong
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. The dataset
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
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 empirical base
Authors
E.L. Usery, J.C. Seong, D.R. Steinwand, M.P. Finn
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 datasets are su
Authors
E. Lynn Usery, Jeong Chang Seong, Dan Steinwand
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 component parts o
Authors
Usery E. Lyn
All equal-area map projections are created equal, but some are more equal than others
High-resolution regional and global raster databases are currently being generated for a variety of environmental and scientific modeling applications. The projection of these data from geographic coordinates to a plane coordinate system is subject to significant areal error. Sources of error include users selecting an inappropriate projection or incorrect parameters for a given projection, algori
Authors
E. Lynn Usery, Jeong Chang Seong
An enhanced digital line graph design
In response to increasing information demands on its digital cartographic data, the U.S. Geological Survey has designed an enhanced version of the Digital Line Graph, termed Digital Line Graph - Enhanced (DLG-E). In the DLG-E model, the phenomena represented by geographic and cartographic data are termed entities. Entities represent individual phenomena in the real world. A feature is an abstracti
Authors
Stephen C. Guptill
A raster approach to topographic map revision
No abstract available.
Authors
E. Lynn Usery, R. Welch
A geological engineering application of a knowledge-based geographic information system
No abstract available.
Authors
E. Lynn Usery, David J. Barr, Robin R. P. Deister
Knowledge-based GIS techniques applied to geological engineering
A knowledge-based geographic information system (KBGIS) approach which requires development of a rule base for both GIS processing and for the geological engineering application has been implemented. The rule bases are implemented in the Goldworks expert system development shell interfaced to the Earth Resources Data Analysis System (ERDAS) raster-based GIS for input and output. GIS analysis proce
Authors
E. Lynn Usery, Phyllis Altheide, Robin R. P. Deister, David J. Barr
Map revision using digital image processing techniques
No abstract available.
Authors
E. Lynn Usery, R. Welch
Science and Products
Filter Total Items: 59
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 assists i
Authors
Michael P. Finn, E. Lynn Usery, Stephan T. Posch, Jeong Chang Seong
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. The dataset
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
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 empirical base
Authors
E.L. Usery, J.C. Seong, D.R. Steinwand, M.P. Finn
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 datasets are su
Authors
E. Lynn Usery, Jeong Chang Seong, Dan Steinwand
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 component parts o
Authors
Usery E. Lyn
All equal-area map projections are created equal, but some are more equal than others
High-resolution regional and global raster databases are currently being generated for a variety of environmental and scientific modeling applications. The projection of these data from geographic coordinates to a plane coordinate system is subject to significant areal error. Sources of error include users selecting an inappropriate projection or incorrect parameters for a given projection, algori
Authors
E. Lynn Usery, Jeong Chang Seong
An enhanced digital line graph design
In response to increasing information demands on its digital cartographic data, the U.S. Geological Survey has designed an enhanced version of the Digital Line Graph, termed Digital Line Graph - Enhanced (DLG-E). In the DLG-E model, the phenomena represented by geographic and cartographic data are termed entities. Entities represent individual phenomena in the real world. A feature is an abstracti
Authors
Stephen C. Guptill
A raster approach to topographic map revision
No abstract available.
Authors
E. Lynn Usery, R. Welch
A geological engineering application of a knowledge-based geographic information system
No abstract available.
Authors
E. Lynn Usery, David J. Barr, Robin R. P. Deister
Knowledge-based GIS techniques applied to geological engineering
A knowledge-based geographic information system (KBGIS) approach which requires development of a rule base for both GIS processing and for the geological engineering application has been implemented. The rule bases are implemented in the Goldworks expert system development shell interfaced to the Earth Resources Data Analysis System (ERDAS) raster-based GIS for input and output. GIS analysis proce
Authors
E. Lynn Usery, Phyllis Altheide, Robin R. P. Deister, David J. Barr
Map revision using digital image processing techniques
No abstract available.
Authors
E. Lynn Usery, R. Welch