Place-Based GIS: The Next Frontier of GIScience Research Presenter: Song Gao Advisory Committee: Krzysztof Janowicz, Michael F. Goodchild, and Helen Couclelis Department of Geography, University of California, Santa Barbara Email: [email protected]
Place-Based GIS: The Next Frontier of GIScience Research
Presenter: Song Gao
Advisory Committee: Krzysztof Janowicz, Michael F. Goodchild,
and Helen Couclelis
Department of Geography, University of California, Santa Barbara
Email: [email protected]
• Coordinates
• Distance
• Direction
• Projection
• Topology
• Scale
• Placename
• Description
• Experience
• Affordance
• Culture
• Semantics
Space and Place
PBGIS ?
Research Questions
• What are the distinctions between place and space
in GIS?
• When and where do we need PBGIS?
• What should be the basic elements of PBGIS?
• How to develop platial theories, models and
techniques analogous to their spatial counterparts?
Where is UC Santa Barbara ?
• Spatial Approach -- Geometry
• Point: (lat 34.41254, long -119.84813)
• Polygon: a region
Where is UC Santa Barbara ?
• Platial Approach – Narrative
• UCSB is one part of UC system. The main
campus is located on a 1,022-acre site near Isla
Vista and Goleta, California, United States,
approximately 8 miles from Downtown Santa
Barbara and 100 miles northwest of Los Angeles.
Paris is partOf Île-de-France Marne-la-Vallée is partOf Île-de-France
Disneyland Paris is part of Paris in human minds but is not contained in the Paris municipality
A place hierarchy does not necessarily require
spatial containment
Data • Place Names in Gazetteers (ADL Gazetteer at
UCSB)
• Natural Language Descriptions about Place
• Social Media
• Linked Data Cloud
Question: What data structures are better to present, store,
and manage the platial data?
Platial JOIN
• Attach the attributes/properties or characteristics from the
join entities to the target place using semantics.
• In other words, the Platial Join operation involves the
aggregation of properties (attributes) from one or multiple
place entities S to the target place entity T based on merge
rules and their predicates P, including the“part-whole”
relation, the “locatedAt” relation, or other spatial relationships
e.g., touch, overlap, equals, contains, inside, and intersects.
Song Gao, Krzysztof Janowicz, Grant McKenzie, Linna Li. Towards Platial Joins and Buffers
in Place-Based GIS. In ACM SIGSPATIAL COMP'13, Nov. 5, 2013, Orlando, FL, USA.
Platial Buffer
• There are two understandings of platial buffers:
(1) One method still applies the Euclidean-distance buffer
on place, which must consider cognitive context due to the
uncertainty of qualitative spatial reasoning (QSR) about
distances and directions referring to places.
(2) An alternative way to process it, is based on the
topological distance (connectivity or hierarchy) and
semantic relations between places.
Song Gao, Krzysztof Janowicz, Grant McKenzie, Linna Li. Towards Platial Joins and Buffers
in Place-Based GIS. In ACM SIGSPATIAL COMP'13, Nov. 5, 2013, Orlando, FL, USA.
Wrap up
• Space v.s. Place in GIScience
• PBGIS in different contexts
• Platial Join and Buffer
• Formalize the platial functionality
Reference:
Song Gao, Krzysztof Janowicz, Grant McKenzie, Linna Li. Towards Platial
Joins and Buffers in Place-Based GIS. In ACM SIGSPATIAL COMP'13, Nov.
5, 2013, Orlando, FL, USA.
Questions & Comments ?
Thanks for your attention!
Email: [email protected]
Website: www.geog.ucsb.edu/~sgao/