]> http://ontonym.org/0.7/location http://ontonym.org/0.7/location 0.8 Copyright 2008-2009. This work is jointly owned by Graeme Stevenson, Juan Ye, Stephen Knox, and University College Dublin. This work is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported Licence. Graeme Stevenson, Juan Ye, and Stephen Knox The Ontonym Location ontology The Ontonym location model supports the description on spaces and the relationships between them. Spaces may be expressed symbolically, as an absolute position in a particular coordinate system, as being relative to another space, or as a combination of the three approaches. Containment, adjacency, connectedness, and overlapping relationships between spaces can also be modelled. The model on which this ontology is based can be found in Ye et al. "A Unified Semantics Space Model". In the proceedings of the third International Symposium on Location and Context-Awareness, LoCA 2007, LNCS vol. 4718, pp. 103-120. adjacent A location that is spatially adjacent to this one base location The location from which this relative location is defined. composed of A geometric region that forms part of this composite. connected A location that is adjacent and directly accessible to this one. connected via A location, such as a lift or exit, that joins two connected locations. Used as part of the connected meta data. contained by a super-space of this location. contains A sub-location of this space. coordinate a coordinate used in the definition of a location. A sequence of coordinates that defines a path or boundary. coordinate sequence coordinate system The coordinate system associated with a coordinate. euclidian distance The straight-line distance measurement between two locations. For example, a reference location and a base location, or the locations specified in a connected relationship. granularity The granularity or resolution of this loaction representation immediately contained by The space that immediately contains this one (i.e., if C is immediately contained by A then there exists no location B where C is contained by B and B is contained by A). immediately contains A location that is immediately contained by this space (i.e., if A immediately contains C then there exists no location B where A contains B and B contains C). locatable feature A locatable feature who's location acts as a proxy for this entity. locatable feature of The entity that this locatable feature can be used to locate. located at A generic property used to relate and entity to a coordinate located in A generic property used to relate an entity to a space origin A coordinate system's point of origion, defined in terms of the coordinate system's reference coordinate system. overlaps A location that overlaps (and is overlaped by) this location. path distance The path-based distance measurement between two locations. reference coordinate system the coordinate system in which this one is defined rotation matrix the rotation matrix used to translate coordinates from one coordinate system to its reference coordinate system. sub granularity The next lowest scale of granularity to this one super granularity The next highest scale of granularity to this one. unit distance The lenght of a single unit in the coordinate reference system x axis the X axis in a rotation matrix. y axis the Y axis in a rotation matrix. z axis the Z axis in a rotation matrix. azimuth The azimuth (az) angle is the compass bearing, relative to true (geographic) north, of a point on the horizon directly beneath an observed object. The horizon is defined as a huge, imaginary circle centered on the observer, equidistant from the zenith (point straight overhead) and the nadir (point exactly opposite the zenith). As seen from above the observer, compass bearings are measured clockwise in degrees from north. Azimuth angles can thus range from 0 degrees (north) through 90 (east), 180 (south), 270 (west), and up to 360 (north again). It is specified and degrees (not radians), and is used to describe a compass relative location. elevation The elevation (el) angle, also called the altitude, of an observed object is determined by first finding the compass bearing on the horizon relative to true north, and then measuring the angle between that point and the object, from the reference frame of the observer. Elevation angles for objects above the horizon range from 0 (on the horizon) up to 90 degrees (at the zenith). Sometimes the range of the elevation coordinate is extended downward from the horizon to -90 degrees (the nadir). It is specified and degrees (not radians), ans is used to describe a compass relative location. radius A radius is used to describe the size of a circle or a sphere. The unit of measurement should be the same as the coordinate system in which the shape is defined. x x is the x (or latitude) value in a coordinate. y y is the y (or longitude) value in a coordinate. z z is the z (or altitude) value in a coordinate. absolute location An absolute location describes a position or space in isolation to other spaces. This may be a coordinate, geometric region, or a symbolic representation. centred location A centred location is described as a geometric area (such as a circle or a cube) whose centre is a coordinate (e.g., the centre of a reference location), and whose edge (or radius) length is the specified distance. circle A circle is an ellipse in which the two axes are of equal length. It is described as a coordinate corresponding to its center, and a radius. compass location In a compass relative location, a coordinate reference system is built, whose origin is a coordinate (or the centre of a reference location) and whose rotation matrix follows a standard compass direction. A compass location describes a target coordinate (e.g., the centre of a location) using this coordinate reference system with a distance to its origin and degrees to “Upper” and “East”. composite region 1 A composite region is a geometric region made up of a number of different geometric regions. Each can be simple or composite. coordinate A coordinate represents a point in a particular coordinate reference system. coordiante sequence A coordinate squence allows the specification of an ordered list of coordinates. Its primary use is for describing a polygon. coordinate system 1 1 A coordinate system is a system for assigning an n-tuple of numbers or scalars to each point in an n-dimensional space. Coordinate systems must be defined by reference to another coordinate system by specifying an origin and rotation matrix. To define a coordinate system in terms of itself, the identity matrix is used. cuboid A cuboid is a solid figure bounded by six faces in which each of the faces is a rectangle, and in which each pair of adjacent faces meets in a right angle. It is described by two coordinates corresponding to a pair of diagonal points. geographic coordinate system A geographic coordinate system enables every location on the Earth to be specified in three coordinates, using mainly a spherical coordinate system. This ontology defines an instance for WGS84, the coordinate system used by most GPS receivers. geometric region A geometric region describes the physical position of a location using one or more geometric shapes, each a set of (ordered) coordinates. line segment A line segment is a length without breadth or thickness. It is described by two coordinates that bound it. locatable entity An entity which has some locatable characteristic (e.g., a person, device, or physical object) locatabe feature A locatable feature is a locatable entity that acts as a proxy for the location of another locatable entity. For example, a mobile phone may act as a proxy for a person. location A location is some represenation of a physical space. location granularity Granularity (sometimes known as resolution) breaks down a location model into a hierarchy of scale-based concepts. e.g., continent, country, region, city, street, building, room, cubicle). Concepts relate to each other using sub- and super-granularity relationships, while the granularity name is specified using the rdfs:label property. Granularities from a completely ordered list. The set of granularities for a particular domain should be defined by the builders of a loction model. polygon A polygon is a closed plane figure bounded by straight sides. It is specified by a sequence of coordinates. rectangle A rectangle is a two-dimensional, four-sided shape with two pairs of equal-length, parallel sides and four right angles. It is described by two coordinates corresponding to a pair of diagonal points. relative location 1 A relative location describes a location with reference to another. rotation matrix A rotation matrix is used to translate cooordinates between different coordinate systems. The Identity rotation matrix (1, 0, 0), (0, 1, 0), and (0, 0, 1) is defined as an instance in this ontology. simple region A simple geometric region is a regular, non-composite, geometric shape. space A Space is the class of locations that have a geometric region. It allows us to define properties about location that do not apply to coordiantes, such as containedBy or overlaps. sphere A shpere is a three-dimensional closed surface such that every point on the surface is equidistant from the center. It is described as a coordinate corresponding to its center, and a radius. symbolic representation A symbolic representation is a location with at least one human-readable descriptive name. The name is specified in the standard way, using the rdfs:label property. three dimensional region A three-dimensional region is a regular, non-composite, geometric shape with length, bredth, and depth. A triangle is a three-sided polygon. It is defined by the three coordinates at the points where its sides meet. two dimensional region A two-dimensional region is a regular, non-composite, planar shape. identity rotation matrix The Identity rotation matrix. 0 0 1 0 0 1 0 0 1 WGS 84 The World Geodetic System is a standard for use in cartography, geodesy, and navigation. It comprises a standard coordinate frame for the Earth, a standard spheroidal reference surface (the datum or reference ellipsoid) for raw altitude data, and a gravitational equipotential surface (the geoid) that defines the "nominal sea level".