By Philippe Rigaux, Michel Scholl, Agnès Voisard
Spatial Databases is the 1st unified, in-depth therapy of exact innovations for facing spatial information, fairly within the box of geographic info structures (GIS). This ebook surveys a variety of recommendations, corresponding to spatial information versions, algorithms, and indexing equipment, built to handle particular beneficial properties of spatial info that aren't safely dealt with by way of mainstream DBMS technology.
The e-book additionally experiences advertisement ideas to geographic information dealing with: ArcInfo, ArcView, and Smallworld GISs; and extensions to the relational version, PostgreSQL and Oracle Spatial. The authors study those underlying GIS applied sciences, examine their strengths and weaknesses, and think about particular makes use of for which every product is most fitted.
* Examines the strengths of assorted question languages and methods to question processing.
* Explains using computational geometry in spatial databases GISs, offering worthwhile history and an in-depth examine key algorithms.
* Covers spatial entry tools, together with the R-tree and a number of other space-driven constructions, and is stuffed with dozens of invaluable illustrations.
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Extra resources for Spatial Databases: With Application to GIS (The Morgan Kaufmann Series in Data Management Systems)
3a). 3b). The resulting theme has as a schema (population, geo). 2. An operation signature describes the type of the argument(s) and the type of the result. Here projection takes as an input (i) a theme (theme is a shortcut for the set of attributes of the input theme) and (ii) a subset of attributes of this theme. 5 39 (b) Theme projection: a theme of countries and population of western Europe (a) and projection on the attribute population (b). 3 14 C 1 An Introduction to Spatial Databases Theme selection (theme× pAi → theme), where pAi is a predicate on the descriptive attributes, is similar to relational selection and is denoted by σ pAi (T ).
1 Simple Operations on Themes Suppose the existence of the following themes: (1) Countries, with the descriptive attributes name, capital, population, and with a geometric attribute referred to as geo, and (2) Languages, representing the distribution of main spoken languages (or families of languages, to be more precise), with the descriptive attribute language and spatial attribute geo. This is summarized in the following two-theme schema: ◆ ◆ Countries (name, capital, population, geo:region) Languages (language, geo:region).
For example, analog maps and other cartographic documents can be digitized using manual, automatic, or semiautomatic techniques. Maps come with a map scale. ). , data accuracy), as well as problems related to data quality. The use of computerized maps varies widely, according to the type of application. A site description in archaeology and a fire-truck routing certainly appear to be dissimilar applications. 1 Database Management Systems (DBMSs) 3 A full-fledged geographic information system (GIS) is able to handle all of these tasks.