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Geographic Objects and Their Categories
Barry Smith & David M. MarkNCGIA & CogSci & Geography
University at Buffalo
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Acknowledgements
U.S. National Science Foundation for supporting this work through grant BCS-9975557 to Mark and Smith
Larry Torcello, Berit Brogaard, and Ryan Kohl for coding the linguistic data
Keith Clarke, Joy Chen, and James Craig for the Mount Everest diagram
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Outline
What is Ontology? (Author’s opinion)Where Do Geographic Categories Come From?The Truth About EarthObjects and Fields: The Individuation ProblemData Standards and Cultural/Linguistic
RelativismSome Empirical ResultsSummary
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Ontology
Ontology studies the constituents of realityAn ontology of a given domain describes in
formal terms the constituents of reality within that domain
The ontology also describes the relations between these constituents, and also the relations between constituents of one domain and others
(Smith)
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Ontology in Artificial Intelligence
In Artificial Intelligence, an ontology is sometimes defined as a specification of a conceptualization
(Tom Gruber <[email protected]>)
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Ontology of Geographic Things
Geographic things are not merely located in space, they typically are tied intrinsically to space in such a way that they inherit from space many of its structural (mereological, topological, geometrical) properties
The role and nature of boundaries is especially important
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Geographic Things, continued
Individuation criteria are much more likely to be ambiguous, and to vary across individuals and cultures, and
Classification (categorization) and individuation probably are not independent
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Where do Categories Come From?
Nature?Bargains within speech communities?Affordances?
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Are Categories in the World?
Natural Kinds “Cut nature at its joints”
This seems clearly to be the case for the biological world, including human artifacts and constructions
But does the inorganic world have these natural ‘joints’ between categories?
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Benjamin Lee Whorf
Sapir-Whorf and linguistic relativism “We cut nature up, organize it into concepts,
and ascribe significance as we do, largely because we are parties to an agreement to organize it in this way—an agreement that holds throughout our speech community and is codified in the patterns of our language. (Whorf, 1940, pp. 213-214.)
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Affordances
J. J. Gibson has provided a valuable account of the perceived world, which he presented as a prelude to his accounts of human visual perception
A key part of his model is the concept of affordances
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Affordances
“The affordances of the environment are what it offers the animal, what it provides or furnishes, either for good or evil.”
James J. Gibson, “The Ecological Approach to Visual Perception.”
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Affordances
“The verb to afford is found in the dictionary, but affordance is not. I have made it up.”
“I mean by it something that refers both to the animal and the environment in a way that no existing term does.”
“It implies the complementarity of the animal and the environment.” (p. 127)
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Geographic Affordances
Conjecture:Parts of the environment gain meaning, become things, mainly according to the activities that they afford.
Parts of the Earth's surface that afford more or less the same activities may be considered to belong to the same category.
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Geographic Affordances
Mountains afford climbingMountains also afford navigation when
they serve as landmarks Lakes afford fishing, the obtaining of
drinking water, swimming, travel by boatForests afford wood gathering, hunting,
hiding from enemiesEtc.
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The Truth about Earth
Earth is a roughly spherical planet with a rocky mantle and crust.
In more detail, Earth is somewhat flattened pole to pole into an oblate spheroid.
Geodesists have defined a reference surface known as the geoid which approximates the shape of planet Earth and which provide a datum for measuring surface irregularities.
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More Truths: Water and Life
Some 70 percent of the surface of Earth is covered by liquid water, and the planet is surrounded by a gaseous envelope called the atmosphere.
Plants cover most parts of the land surface, and animals (including humans) move about among those plants.
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Ontology for Science?
A complete ontology of geographic phenomena will have to incorporate all of these scientific facts and more, but are they relevant to our current effort to describe primary geographic theory, Naive geography, geography relevant to action?
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Land Forms
Forces from above and below have shaped the form of the surface of Earth and other rock planets.
The influence of gravity is a dominant factor—loose material tends to move away from high areas toward lower ones in a process generally termed erosion.
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Land Forms
Steeper slopes are less stable than gentle ones and so over time there is a tendency toward leveling unless other forces act against that.
Overhanging cliffs are extremely rare, so the elevation of the Earth's surface can be conceptualized as a single-valued function of horizontal position, that is, as a continuous field.
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Land Forms
Generally speaking, this is how science has modeled the geometry of the Earth's surface.
Scientists who attempt to account for or model hydrology and sediment transport conceptualize the Earth's surface as composed of slope gradients and orientations over a field of elevations.
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Land Forms
This idea of the single-valued field of elevations as a representation of the form of the Earth's surface has been incorporated implicitly or explicitly into representations of earth form developed for computers in the 1950s and since. Grids or DEMs TINs
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Topography Experienced
The topographic environment as experienced by people is very different from this
It is the same environment, of course, but experienced through human senses in the context of human activities and needs.
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Topography Experienced
When viewed from the surface of the Earth by a creature between 1 and 2 meters tall, variations of surface elevation of tens, hundreds, or thousands of meters dominate the experienced landscape, while at the same time, the curvature of the geoid, of the horizontal, is almost imperceptible.
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Topography Experienced
When people see, learn, and describe a landscape, they do not think of it as a field or surface.
Rather, they consider it to be composed of objects or things, presumably based on some combination of gestalt visual perception and the perception of affordances.
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Topography Experienced
Visual perception tends to identify convex surfaces are forming objects, and Gibson wrote of detached objects as having completely closed surfaces making them moveable, or as attached objects that forms parts of the surfaces of larger things.
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Topography Experienced
The perceived surface of the Earth appears to follow this principle and to be dominated by convex rather than concave parts.
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Topography Experienced
In an experiment to be detailed later, in which subjects were asked to list examples of geographic features, objects, or things, mountain was the most frequent example, listed by 151 of 263 subjects.
A secondary form of land convexity, hill, was listed somewhat more often (by 43 subjects) than was the most frequent concave form, valley (39 subjects).
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Topography Experienced
Evidently, mountains are the quintessential geographic things to everyday people, yet they hardly appear in the scientific models. Nor do they appear as objects in our geographic databases.
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Topography Experienced
Mountains and the like also have been neglected in philosophers' ontologies (e.g. Aristotle), which have taken as their paradigm for objects complete moveable things with their own boundaries (such as people, or atoms, or planets), what Gibson called "detatched objects".
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Objects and Fields: The Individuation Problem
Do mountains really exist?
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Do mountains really exist?
Mont Blanc
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Do mountains really exist?
Yes, obviously! But what does “exist” mean here?Do things (objects? entities?) exist that
are members of the category “mountain”?Perhaps “mountains” just convex parts of
the elevation fields
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Perhaps mountains are just convex parts of elevation fields...
QuickTime™ and aPlanar RGB decompressor
are needed to see this picture.
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Which part is Mount Everest?
QuickTime™ and aPlanar RGB decompressor
are needed to see this picture.
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Data Exchange Standards
and Linguistic Relativism
Standard Facilitate Data ExchangeCommon Ontology facilitates Semantic
InteroperabilityBut what about cultural or linguistic
differences in categories?An Example: Étangs
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Semantics for Geospatial Data Exchange
An Example from the DIGEST standard (Digital Geographic Information Working Group, DGIWG)
BH080: A body of water surrounded by land
US Lake / Pond
FR Lac / Étang
GE See / Teich
IT Lago / Stagno
NL Meer / Plas / Vijver
SP Lago / Laguna
UK Lake / Pond
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Semantics for Geospatial Data Exchange
Are “ponds” in English the same as “étangs” en Français?
BH080: A body of water surrounded by land
US Lake / Pond
FR Lac / Étang
GE See / Teich
IT Lago / Stagno
NL Meer / Plas / Vijver
SP Lago / Laguna
UK Lake / Pond
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Étang de Berre
Avec ses 75 km de périphérie et une profondeur ne dépassant pas 9 mètres, cet étang gigantesque est relié à la Méditerrannée par un canal à l'ouest, et par un souterrain à l'est, en direction de Marseille
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Things are not always what they say they are ...
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Étang de Berre
Ceci n’est pas un «pond»!
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Étang de Berre
So, is it a lake?
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Étang de Berre
No! In English it would be called a “lagoon”!
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Another Kind of Water Body: Lagoon
BH190: Open body of water separated fromthe sea by sand bank or coral reef
US Lagoon / Reef Pool
FR Lagon / Lagune
GE Lagune
IT Laguna
NL Lagune / Strandmeer
SP Albufera
UK Lagoon / Reef Pool
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Conceptual Model for Water Bodies
“A body of water surrounded by land”“Open body of water separated from the sea by a sand
bank or coral reef”
Kinds of water bodies may be distinguished by Size Origin Water quality ...
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}-
Conceptual Model for Water Bodies
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Different Languages
Different languages may give different weights to these factors
Consider English and French
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Geographic Categories
Some Empirical Results
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Category Norms (following Battig and Montague, 1969)
“For each of the following categories, please write down as many items included in that category as you can in 30 seconds, in whatever order they happen to occur to you”
Subjects were then given a series of category labels
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Subjects
263 students from the “World Civilization” general education course at UB, Fall 2000
Additional subjects in Finland, Croatia, Poland, Guatemala, and England
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What Difference Does the Exact Question Make?a kind of geographic feature a kind of geographic objectsomething that could be portrayed on a
map(concept, entity, phenomenon)
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English Norms, ‘feature’ highest
term feature object map-pable
total F
mountain 48 23 25 96river 35 18 31 84lake 33 13 21 67ocean 27 16 18 61hill 20 9 0 29valley 21 7 0 28plain 19 6 1 26plateau 17 4 0 21desert 14 6 0 20volcano 10 4 0 14stream 6 2 1 9
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English Norms, ‘object’ highest
term feature object map-pable
total F
map 0 17 0 17
globe 0 11 0 11
peninsula 8 10 1 19
compass 0 8 2 10
land 2 6 0 8
rock 1 6 0 7
atlas 0 6 0 6
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English Norms, ‘mappable’ highest
term feature object map-pable
total F
city 1 4 30 35road 1 2 27 30country 2 6 23 31state 0 5 15 20continent 1 10 12 23town 0 5 8 13street 0 1 8 9highway 1 0 7 8park 0 0 6 6county 0 2 5 7building 0 1 5 6
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Non-geographic things
term feature object not map-pable
total F
54 57 50 161NO ENTRY 13 8 2 23house 9 8 6 23building 13 6 1 20car 4 14 8 26pen 1 11 0 12chair 1 9 1 11book 0 8 1 9pencil 0 8 1 9desk 0 8 0 8person 6 6 16 28animal 1 4 7 12
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Physical things
term feature object some-thing
entity phenom-enon
N= 17 21 18 18 19weight 4 - 1 1 -height 4 - - 1 -pen - 6 1 - -table - 4 3 - -chair - 4 2 - -mountain - 2 6 2 1rock 1 2 2 2 -tree - 1 4 - -no response 3 3 - 5 4hurricane - - - - 4
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Weather Phenomenon (263 subjects)
hurricane 225tornado 214rain 100snow 85blizzard 75hail 67lightning 65earthquake 57typhoon 56flood 49sleet 42monsoon 41thunder 41wind 38thunder storm 33
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Weather Phenomenon, Finnish (60 subjects)
sade rain 45myrsky storm, tempest 34tuuli wind 28ukkonen thunder and lightning 22lumisade snowfall 20auringonpaiste sunshine 15pouta dry weather 11helle heat, hot weather 10pakkanen cold 10hurrukaani hurricane 8tornado tornado 8pyörremyrsky tornado 7räntäsade sleet 5vesisade rain 5
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Geographic Waters
Mean US English Mean Finnish Mean CroatianN=261 N=60 N=34
0.83 ocean 0.04 valtameri 0.21 ocean0.42 sea 0.66 meri 0.78 more0.81 river 0.63 joki 0.73 rijeka0.80 lake 0.75 jarvi 0.55 jezero0.57 creek, brook, stream 0.15 puro 0.14 potok0.38 pond, pool 0.30 lampi 0.00 ribnjak0.17 bay, gulf, inlet 0.17 lahti, poukama 0.00 saljev, zaton0.14 waterfall, rapids 0.07 koski 0.05 slapovi0.12 canal, channel 0.21 kanava 0.00 kanal0.10 swamp, bog, marsh 0.22 suo 0.29 mocvaram, bara
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Summary
Geographic things are specialLinguistic Relativism may be relevantSome phenomena are more like fieldsPeople apparently conceptualize most
phenomena as objectsFormalizing geographic ontologies should
be difficult, and fun!
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Thanks for your Attention!