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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... vertices that correspond to the polygons approximating the boundaries of France; that is, getting the boundaries of all objects constituting France (i.e., the mainland and the islands). This query can be expressed in SQL as follows ...
... vertices. ENTITY-BASED DATA IN VECTOR MODE There exists a large number of variants to represent polylines and ... vertices has 2n possible representations. There are n ways of choosing where to start the boundary description; once the ...
... vertices with integers instead of giving their coordinates, as previously. We can see the following in Figure 2.7. (4,4) (0,2) (2,2) (6,1) (3,0) -*a.x. 11 (a) (b) (c) Figure 2.7 Examples of polylines: L1. Figure 2.6 Vector representation ...
... vertices. The region consisting of the single polygon P is described by the singleton {< 13, 14, 15, 16 =}. Similarly, the region consisting of polygon P is described as the singleton {< 1, 2, 3, 4 =}. In summary, this representation ...
... vertices of the triangles. The elevation value is recorded at each vertex, and inferred at any other point P by linear interpolation of the three vertices of the triangle that contains P (see Figure 2.9). Data structures for TINs ...
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 |