E. Lynn Usery (Former Employee)
Science and Products
Filter Total Items: 60
All equal-area map projections are created equal, but some are more equal than others 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...
Authors
E. Lynn Usery, Jeong Chang Seong
An enhanced digital line graph design 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
Authors
Stephen C. Guptill
A raster approach to topographic map revision 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 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 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...
Authors
E. Lynn Usery, Phyllis Altheide, Robin R. P. Deister, David J. Barr
Map revision using digital image processing techniques Map revision using digital image processing techniques
No abstract available.
Authors
E. Lynn Usery, R. Welch
Science and Products
Filter Total Items: 60
All equal-area map projections are created equal, but some are more equal than others 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...
Authors
E. Lynn Usery, Jeong Chang Seong
An enhanced digital line graph design 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
Authors
Stephen C. Guptill
A raster approach to topographic map revision 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 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 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...
Authors
E. Lynn Usery, Phyllis Altheide, Robin R. P. Deister, David J. Barr
Map revision using digital image processing techniques Map revision using digital image processing techniques
No abstract available.
Authors
E. Lynn Usery, R. Welch