Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Ensuring the Quality of Geographic Information System Data: A Practical Application of Quality Control.
Author Campbell, W. G. ; Mortenson, D. C. ;
CORP Author Corvallis Environmental Research Lab., OR. ;NSI Technology Services Corp., Corvallis, OR.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-89/306;
Stock Number PB90-198714
Additional Subjects Information systems ; Quality control ; Data processing ; Quality assurance ; Error analysis ; Uncertainty ; Water pollution ; Acidification ; Surface waters ; Reprints ; Geographic information systems ; Direct/Delayed Response Project ; Case studies ; Data base management ; US EPA
Library Call Number Additional Info Location Last
NTIS  PB90-198714 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 08/27/1990
Collation 8p
Geographic Information Systems (GIS) are a valuable tool for many types of environmental analysis. Errors within GIS data, however, can limit the usefulness of GIS technology. To control and document the error introduced during data entry, the authors have instituted a series of Quality Control (QC) procedures for use within the U.S. Environmental Protection Agency's Direct/Delayed Response Project (DDRP). Central to their approach has been the use of formalized log sheets detailing the steps necessary for validating and digitizing mapped data. Additionally, they have evaluated the accuracy and precision of the data at specific stages of the data entry process. At critical stages, these formalized evaluations were independently repeated. The authors believe that the establishment of QC procedures within the DDRP has led to very low error rates associated with GIS data entry. Their procedures and techniques described within the paper have other applications within the GIS community. (Copyright (c) 1989 American Society for Photogrammetry and Remote Sensing.)