컴퓨터를 利用한 Map Data의 取及

Abstract

This paper reviews methodology and research related to computer handing of map data, the data which describe cartographic entities such as points, lines and areas. The paper first examines methods for data capture and the organization of that data within a computer environment. The discussion includes the merits and problems of raster and vector-mode encoding, the topological data structure and the vectorization procedure of raster data. The SYMAP, GIMMS CALFORM input, the U. S. DIME file and the Canada Geographical Information System are some of the examples taken for the discussion. The research themes identified in recent literature of map data are: 1) the development of a good" da ta structure, reflecting topology and hierarchy of cartographic entities; 2) methodology for data reduction and file management in order to facilitate storage, retrieval and manipulation; 3) the integration of data, in particular, integrating remote sensored data with existing data bases; and 4) the development of a map language" for the forma1 description of spatial objects, their attributes and relations. The literature a1so shows several areas which require further research and investigation, such as: the development of digital cartographic data bases, topographic map data in particular, as a national resource; the measurement of data reliability and the creation of machine-independent data to facilitate data exchange; the need to make documentation more consistent and

uniform; and the establishment of standardized notation in describing data structure and encoding.