Digest : a primer for the international GIS standard / Kelly Chan.

Format:

Book

Author/Creator:

Chan, Kelly.

Language:

English

Subjects (All):

Geographic information systems--Standards.

Geographic information systems.

Physical Description:

128 pages : illustrations ; 24 cm

Place of Publication:

Boca Raton, Fla. : Lewis Publishers, [1999]

Contents:

Chapter 1 VPF and Digest/VRF 1

Interface Standard for Vector Product Format 2

Chapter 2 A Database Tour 9

Annotated Example of a VPF Database 12

Chapter 3 Data Structure 27

Naming Convention 28

Reserved Names 30

Table Structure 31

Table Header 32

Table Schema 33

Annotated Header Example 35

Data Types 38

String Data Type 39

Triplet Id Data Type 40

Null Data Type 42

Chapter 4 Features and Feature Classes 45

Coverages and Tiles Organization 46

Categories of Features 47

Area Feature Class 47

Line Feature Class 48

Point Feature Class 48

Text Feature Class 48

Complex Feature Class 48

Feature Class Implementation 49

Feature Class Schema Table 52

Sample Join Table Operations 52

Feature Join Tables 55

From-To Indicator for Linear Features 56

Chapter 5 Graphic Primitives 57

Primitive Types 58

Primitives at Level 0 Implementation 58

Primitives at Levels 1 and 2 Implementation 61

Primitives at Level 3 Implementation 64

Geometric Primitives 64

Edge 64

Connected Node 67

Face 67

Ring 68

Entity Node 69

Cartographic Primitives 70

Text 70

Chapter 6 Topology in Geospatial Data 71

Topology Levels 72

Level 0 Boundary Representation 72

Level 1 Linear Network 73

Level 2 Planar Network 74

Level 3 Planar Graph 74

Implementation 76

Limitations 79

Chapter 7 Thematic Index 81

Variable-Length Table Index 81

Variable-Length Table Index Header 82

Variable-Length Table Index Data Entry 82

Thematic Index Header 83

Inverted-List Thematic Index 85

Bit-Array Thematic Index 88

Feature Join Index 90

Join Index Table Schema 92

Feature Join Index Example 92

Chapter 8 Spatial Index 95

Minimum Bounding Rectangle (MBR) 95

MBR Table Format 96

MBR for Universe Face 96

Semiquad Tree Spatial Index 97

Spatial Index Bucket Size 98

Division Algorithm and Numbering Scheme 99

Spatial Index Header 102

Data Offset 103

Bin Data Records 103

Spatial Index Example 104

Navigation with Spatial Index 105

Limitations 105

Chapter 9 Tiling 107

Data Structures for Tiling 108

Tileref Coverage 108

Tileref Area Feature Class 108

Tileref Area Feature Attributes 109

Face Primitives in the Tileref Coverage 109

Cross-Tile Topology 112

Chapter 10 Data Quality 117

Data Quality Table 117

Features and Primitive Data Quality Information 118

Data Quality Coverage 119.

Notes:

Includes bibliographical references and index.

ISBN:

1566702410

OCLC:

38551429