Geographic Objects with Indeterminate Boundaries

Front Cover
CRC Press, Mar 7, 1996 - Technology & Engineering - 352 pages
Current geographical information systems GIS deal almost exclusively with well-defined, static geographical objects ranging from physical landscapes to towns and transport systems. Such objects, exactly located in space, can easily be handled by modern GIS, yet form only a small proportion of all the possible geographical objects.; This book challenges the assumption that the world is compsed of exactly defined and bounded geographic objects such as land parcels, rivers and countries. ignoring the essential complexity of the world, current GIS do not adequately address problems as diverse as the resolution of crime between national boundaries, or the interpretation of views of people from different cultures. This work, bringing together a range of specialists from fields such as linguistics, computer science, land surveying, cartography and soil science, examines current research into the challenges of dealing with geographical phenomena that cannot easily be forced into one of the two current standard data models.
 

Contents

Natural Objects with Indeterminate Boundaries
3
On the Relations between Spatial Concepts and Geographic
8
The Prevalence of Objects with Sharp Boundaries in GIS
29
Towards an Operational Typology of Geographic Entities with
45
Boolean and Fuzzy Regions
87
Qualitative Shape Representation
123
Modelling Spatial Objects with Undetermined Boundaries using
141
PART FOUR Qualitative Topological Relations and Indeterminate
153
A Syntactic Approach for Handling the Semantics of Fuzzy Spatial
207
First Specifications
225
On Layerbased Systems for Undetermined Boundaries
237
Hierarchical Models for the Definition and Extraction of Terrain
257
Practical Issues of Dealing with Objects with Indeterminate
271
Defining Landscape
287
From Continuous Fields to Entities
313
Practical Consequences of Distinguishing Crisp Geographic
335

The EggYolk Representation of Regions with Indeterminate
171
PART FIVE Data Models for Indeterminate Objects and Fields
189

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