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What is Subdivision Overlay

Chapter 9
Handbook of Research on Geoinformatics
It is the process of generating an output plane subdivision from overlaying two or more input plane subdivisions. A plane subdivision is a set of points, lines, and the regions determined by such points and lines. The output subdivision must contain all the points from the input maps plus the points of intersection between the input subdivision segments. The lines in the output subdivisions will be those made up by the input lines divided at the intersection points and the input lines that do not intersect. The output regions will be the union and intersection of all the input regions.
Published in Chapter:
Map Overlay Problem
Maikel Garma de la Osa (University of Havana, Cuba) and Yissell Arias Sánchez (University of Havana, Cuba)
Copyright: © 2009 |Pages: 8
DOI: 10.4018/978-1-59140-995-3.ch009
Abstract
Maps usually contain data from different sources (e.g., population, natural resources, cities, roads, infant mortality rate, etc.) When all the information is complied it is almost impossible to distinguish a certain type of data from the rest. Geographic Information Systems (GIS) usually organize maps into layers, each representing an aspect of the real world (de Hoop et al. 1993). Layers form thematic maps of a single type of data, allowing users to query each one separately.
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