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Hägerstrand's time geography is a powerful conceptual framework for understanding constraints on human activity participation in space and time. However, rigorous, analytical definitions of basic time geography entities and relationships do not exist. This limits abilities to make statements about error and uncertainty in time geographic measurement and(More)
Acknowledgments: Thanks to Mike Goodchild and Dave Unwin for helpful comments on earlier versions of this chapter. Abstract: Geographic information systems (GIS) are convenient and potentially powerful platforms for transportation and urban analysis. Most GIS-based tools for transportation and urban analysis continue a place-based representation that is(More)
The space-time prism (STP) and STP-based accessibility measures are powerful techniques for assessing the ability of individuals to travel and participate in activities at different locations and times in a given environment. However, traditional STPs and STP-based accessibility measures ignore spatial and temporal variations in travel times in an urban(More)
Transportation systems exist to improve individual accessibility. However, emerging applications of GIS in transportation (GIST) and intelligent transportation system (ITS) focus on throughput (the amount of system flow) rather than accessibility. Throughput is related but not equivalent to accessibility. Sensitive transportation planning requires rigorous,(More)
Spatial analysis mostly developed in an era when data was scarce and computational power was expensive. Consequently, traditional spatial analysis greatly simpli®es its representations of geography. The rise of geographic information science (GISci) and the changing nature of scienti®c questions at the end of the 20 th century suggest a comprehensive(More)