MAPEDIT system for automatic map digitization

Conference · Wed Jan 01 04:00:00 EST 1975 · Comput. Graphics; (United States)

OSTI ID:7309910

Holmes, H H; Austin, D M; Benson, W H

A system for the automatic digitization of polygon boundaries is described. Digitized map files are created from a driver tape containing identification codes and approximate centroids of polygonal boundaries (e.g. census tracts) and a film image of the map. The digitizer scans on the film plane in an automatic line-following mode, producing the first stage of the map file for the editing system. The MAPEDIT system, which can be used either interactively or in batch mode, reads maps in several standard formats and provides for combining and selecting maps by census (or other) geocodes or by longitude and latitude. This system provides several stages of data compression, analysis, and verification, including algorithms for detecting straight lines, finding corners, fitting insets of maps together and matching boundaries common to a pair of polygons. Auxiliary programs provide a very high resolution (1 part in 25,000) CRT plot of the map, allow a detailed examination and editing of the map, and supply missing geocodes using auxiliary tapes such as the Medlist tapes. 2 figures.

• Research Organization: Univ. of California, Berkeley
• OSTI ID: 7309910
• Conference Information: Journal Name: Comput. Graphics; (United States) Journal Volume: 1
• Country of Publication: United States
• Language: English

Related Subjects

99 GENERAL AND MISCELLANEOUS
990200* -- Mathematics & Computers
ALGORITHMS
AUTOMATION
COMPUTER CODES
DIGITIZERS
M CODES
MAPS
MATHEMATICAL LOGIC
TWO-DIMENSIONAL CALCULATIONS