Spatial Databases: With Application to GISElsevier, 30. 5. 2001 - Počet stran: 410 Spatial Databases is the first unified, in-depth treatment of special techniques for dealing with spatial data, particularly in the field of geographic information systems (GIS). This book surveys various techniques, such as spatial data models, algorithms, and indexing methods, developed to address specific features of spatial data that are not adequately handled by mainstream DBMS technology. The book also reviews commercial solutions to geographic data handling: ArcInfo, ArcView, and Smallworld GISs; and two extensions to the relational model, PostgreSQL and Oracle Spatial. The authors examine these underlying GIS technologies, assess their strengths and weaknesses, and consider specific uses for which each product is best suited. |
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... Scanning a set of items 269 From the declarative query to the physical QEP 271 The creation of initial runs 273 The merge phase 273 Distribution sweeping 276 External rectangle intersection algorithm 278 Example of a z-ordering join 281 ...
... vertex has been chosen, there are two ways of scanning the vertices, called clockwise and counterclockwise orders. Second, there is no apparent distinction between a polyline structure 38 CHAPTE R2 Representation of Spatial Objects.
... scanned. Accessing each of its arcs provides a polygon adjacent to P. Another advantage is related to update consistency. Because of object sharing, consistency maintenance and. Figure 2.14 Representation of polygons in the topological ...
... scanning a set of lines. With the topological model, scanning is much slower than with a set of "spaghetti” lines. Indeed, navigating through complex data structures a large number of times might lead to significant overhead. Note also ...
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Obsah
1 | |
29 | |
CHAPTER 3 LOGICAL MODELS AND QUERY LANGUAGES | 69 |
CHAPTER 4 THE CONSTRAINT DATA MODEL | 113 |
CHAPTER 5 COMPUTATIONAL GEOMETRY | 149 |
CHAPTER 6 SPATIAL ACCESS METHODS | 201 |
CHAPTER 7 QUERY PROCESSING | 267 |
CHAPTER 8 COMMERCIAL SYSTEMS | 311 |
BIBLIOGRAPHY | 373 |
INDEX | 395 |
ABOUT THE AUTHORS | 409 |
Další vydání - Zobrazit všechny
Spatial Databases: With Application to GIS Philippe Rigaux,Michel Scholl,Agnès Voisard Omezený náhled - 2002 |