Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Exploring the effects of vector to raster and raster to vector conversion
Author Congalton, Russell G. ; Schallert, D. M.
Other Authors
Author Title of a Work
Schallert, Diane M.
Lunetta, Ross S.
CORP Author California Univ., Berkeley. Dept. of Forestry and Resources Management.;Environmental Monitoring Systems Lab., Las Vegas, NV.
Publisher U.S. Environmental Protection Agency, Center for Environmental Research Information,
Year Published 1992
Report Number EPA/600/R-92/166 ; OV-0291-NAEX
Stock Number PB93-122166
OCLC Number 37396060
Subjects Geographic information systems
Additional Subjects Geographic information systems ; Data conversion ; Computer graphics ; Digital maps ; Remote sensing ; Polygons ; Accuracy ; Raster format ; Vector format
Library Call Number Additional Info Location Last
ELBD  EPA 600-R-92-166 AWBERC Library/Cincinnati,OH 04/10/1998
NTIS  PB93-122166 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 01/01/1988
Collation {vi}, 48 p. : ill. ; 28 cm.
Spatial data can be represented in two formats: raster (grid cell) or vector (polygon). It is inevitable that conversion of the data between these two formats be essential to the best use of the data. Most geographic information systems (GIS) now provide software for such a conversion. The objective of the study was to evaluate the effects of data conversion on the accuracy of the resulting data layer. Simple shapes were chosen to document the results of the raster to vector and vector to raster conversion processes. These shapes included a square, a triangle (not aligned with the grid), a circle, a hole within the circle, and a non-convex shape. Error matrices were employed to represent the changes in area through the conversion process. A second set of data including a circle, a thin rectangle, and a wide rectangle were used to examine the effects of grid cell size on both presence/absence of a feature as well as maintaining the feature's shape. Finally, recommendations for continuing the work and its application to information derived from remotely sensed data were presented.
"September 1992." "EPA/600/R-92/166." "UCB P.O. # OV-0291-NAEX." "Technical monitor, R.S. Lunetta." Includes bibliographical references.