The past five years have seen an increasing degree of concern over the issue of accuracy in
geographic databases
and GIS. "Accuracy of Spatial Databases" was the topic of the first research initiative of the
U.S. National Center for Geographic Information and Analysis (NCGIA) from 1988 to 1990 (Goodchild
and Gopal, 1989; Goodchild,
1992). Since then there have been conferences devoted to the subject in Australia (Hunter, 1991)
and the U.S. (Congalton, 1994). A second NCGIA initiative on "Visualization of Geographic Data
Quality" (1991-1994) looked at methods for communicating information on quality and uncertainty to
users of maps and GIS. The data quality issue has surfaced in several other NCGIA initiatives, including "Integration of GIS and Remote
Sensing" (Lunetta et al., 1991).
The past five years have seen an increasing degree of concern over the issue of accuracy in geographic databasesand GIS. "Accuracy of Spatial Databases" was the topic of the first research initiative of the U.S. National Center for Geographic Information and Analysis (NCGIA) from 1988 to 1990 (Goodchild and Gopal, 1989; Goodchild,1992). Since then there have been conferences devoted to the subject in Australia (Hunter, 1991) and the U.S. (Congalton, 1994). A second NCGIA initiative on "Visualization of Geographic Data Quality" (1991-1994) looked at methods for communicating information on quality and uncertainty to users of maps and GIS. The data quality issue has surfaced in several other NCGIA initiatives, including "Integration of GIS and Remote Sensing" (Lunetta et al., 1991).
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