tailieunhanh - Book Spatial DB System

• Data models facilitate • Early analysis of properties, . . storage cost, querying ability, • Re-use of shared data among multiple applications • Exchange of data across organization • Conversion of data to new software/ environment • Example - Y2K crisis for year 2000 Many computer software systems were developed without welldefined data models in 1960s and 1970s. These systems used a variety of data models for representing time and date. Some of the representations used two digits to represent years. In late 1990s, people worried that the 2 digit representation of year may lead to errorneous behaviour. For example age of a person born in 1960 (as 60) in year. | CONTENTS 2 1 2 3 4 5 6 INTRODUCTION TO SPATIAL DB SPATIAL DATA MODELS BUILDING A GEODATABASE r SPATIAL QUERY LANGUAGES SPATIAL STORAGE AND INDEXING QUERY PROCESSING OPTIMIZATION SPATIAL DATA MINING SPATIAL CONCEPTS DATA MODELS Introduction Models of Spatial Information Three-Step Database Design Extending ER with Spatial Concepts .

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