Spatial Databases: With Application to GIS
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Section 1.3 presents operations typically performed while using a GIS. System architecture alternatives to support such operations are discussed in Section ...
THEME UNION The (relational) union of two themes (theme X theme - theme) consists in performing the union of sets of geographic objects having the same ...
... FOR GEOSPATIAL DATA The previous section points out the need for a system that allows one to perform the following on geospatial and alphanumeric data: ...
Querying themes that are defined in this way is performed via SQL. Consider the query Return the contours of France. Solving this query implies getting the ...
We call it the embedding space in the following, and sometimes the search space whenever a search operation is to be performed. This chapter is organized as ...
Co říkají ostatní - Napsat recenzi
CHAPTER 7 QUERY PROCESSING
CHAPTER 8 COMMERCIAL SYSTEMS
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