Interoperable and Distributed Processing in

This text shows how the principles and technologies of object-oriented programming, distributed processing, and internet protocols can be embraced to further the reliability and interoperability of datasets for the professional GIS market.

Introduction

1

(6)

Problem statement

1

(2)

Background

3

(2)

Road map

5

(2)

I Interoperability

7

(56)

Interoperability in geoprocessing

9

(26)

Overview

9

(1)

Data migration

10

(4)

Integration and databases

14

(6)

Data integration and geographical information systems

20

(13)

Overview

20

(1)

GIS and remote sensing

21

(1)

Semantic heterogeneity

22

(4)

Data quality

26

(2)

Metadata

28

(2)

System integration

30

(1)

Environmental data management

31

(2)

Review

33

(2)

Virtual Data Set

35

(28)

Overview

35

(1)

Interoperability impediments

36

(4)

Syntactical diversity

36

(1)

Semantic diversity of geographic information

36

(2)

Diverse information communities

38

(1)

Market forces

39

(1)

Approaches for improvements

40

(6)

Data definition languages

40

(1)

Object-oriented models

41

(4)

Semantic accuracy

45

(1)

Open Geodata Interoperability Specification

46

(8)

Overview

46

(1)

Open Geodata Model

47

(4)

Services Model

51

(3)

The Virtual Dataset concept

54

(6)

Review

60

(3)

II Essential models

63

(54)

Example: field representations

65

(26)

Overview

65

(1)

Continuous fields

65

(2)

Measurement of fields

67

(7)

Current representation techniques

74

(10)

Cell grids

77

(1)

Polyhedral tessellation

77

(3)

Simplicial complexes

80

(1)

Lattice or point grids

80

(1)

Irregular points

81

(1)

Contour models

82

(2)

Characteristics of the domain D

84

(1)

Characteristics of the range

85

(1)

Analysis of continuous field data

86

(2)

Impediments

88

(1)

Review

89

(2)

Modeling uncertainties

91

(26)

Introduction

91

(3)

Uncertainties

94

(4)

What is uncertainty?

94

(1)

Basic concepts of modeling uncertainties

95

(2)

Inference from uncertain propositions

97

(1)

Methods for the modeling of uncertainty

98

(8)

Overview

98

(1)

Probability theory

98

(2)

Interval methods

100

(3)

Fuzzy sets

103

(2)

Dempster-Shafer theory of evidence

105

(1)

Assessing the uncertainty of functional expressions

106

(5)

Overview

106

(1)

Gaussian error propagation

107

(2)

Monte Carlo methods

109

(1)

Other techniques

110

(1)

Digital representation

111

(1)

Numbers, units and dimensions

112

(3)

Review

115

(2)

III mplementation

117

(92)

Case studies

119

(24)

Introduction

119

(1)

PostScript

119

(9)

Overview

119

(2)

Impediments

121

(4)

Document Structuring Conventions

125

(2)

Independence

127

(1)

Lessons learned

127

(1)

Internet and World-Wide Web (WWW)

128

(12)

Overview

128

(1)

Interprocess communication and network-level services

129

(1)

Scalability

130

(4)

World-Wide Web

134

(4)

Openness and standardization processes

138

(1)

The future: IPv6

138

(1)

Lessons learned

139

(1)

Review

140

(3)

Strategies

143

(38)

Introduction

143

(1)

Component Object Model

144

(4)

Overview

144

(1)

Interfaces

145

(1)

Feasibility

146

(2)

Common Object Request Broker Architecture

148

(7)

Overview

148

(2)

Interfaces

150

(1)

Feasibility

150

(5)

Other approaches

155

(2)

Java

157

(23)

Overview

157

(2)

Design goals

159

(2)

Main features

161

(9)

Java as a distributed computing environment

170

(10)

Review

180

(1)

Examples

181

(20)

Introduction

181

(1)

Uncertainty representation

182

(11)

Overview

182

(1)

A Java package for uncertain values: vds. value

183

(3)

Intervals

186

(1)

Probability distributions

186

(2)

Histograms

188

(4)

Dimensioned values

192

(1)

Fields

193

(8)

Overview

193

(2)

A simple field

195

(1)

VDS and user interfaces

195

(6)

Conclusion

201

(8)

Retrospective view

201

(4)

Prospective view

205

(4)

A Java examples

209

(4)

A.1 Availability

209

(1)

A.2 Package contents

210

(3)

A.2.1 Package vds.value

210

(1)

A.2.2 Package vds.geometry

211

(1)

A.2.3 Package vds.field

211

(1)

A.2.4 Package vds.test

211

(2)

References

213

(16)

Index

229

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Interoperable and Distributed Processing in Gis

Summary

Table of Contents

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Interoperable and Distributed Processing in Gis

Summary

Table of Contents

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