Abbreviations

Results for area 6.2 Geographic data file (GDF)

term
geographic data file (GDF)
definition

data model, data specification and exchange standard for geographic data for road transport applications

term
local dynamic map (LDM)
definition

a conceptual data store which is embedded in an ITS station and which contains topographical, positional and status information

standard (extract)
term
topology
definition

properties of spatial configuration invariant under continuous transformation

NOTE In a digital map database this means the logical relationships among map features. It can be used to characterize spatial relationships such as connectivity and adjacency.

term
graph
definition

set of points and a set of arrows, with each arrow joining one point to another, whereby the points are called Nodes of the graph, and the arrows are called the Edges of the graph

standard (extract)
term
planar graph
definition

graph which can be embedded in a plane, meaning that it can be drawn on the plane so that Edges intersect only at a Node mutually incident with them

standard (extract)
term
non planar graph
definition

graph which is not planar

standard (extract)
term
quad tree
definition

hierarchical data structure which on a next lower level subdivides a given area into four quadrants of the same size where any level has knowledge of its four sublevels and its parent level

standard (extract)
term
loop
definition

edge which is bounded at both ends by one and the same node

standard (extract)
term
edge
definition

directed sequence of non-intersecting Line Segments with Nodes at each end

standard (extract)
term
node
definition

zero-dimensional element that is a topological junction of two or more edges, or an end point of an edge

NOTE A node is created for topologically significant points, such as simple intersections of roads or other linear features including boundaries but also for locations such as electric beacons, kilometre-posts or sensors detecting traffic flows, being significant points specified in a map.

standard (extract)
term
super link
definition

aggregation of linearly connected regular links present in the lowest level as a simplified representation of the road network in higher levels

standard (extract)
term
link
definition

directed topological connection between two nodes, composed of an ordered sequence of one or more segments and represented by an ordered sequence of zero or more shape points

standard (extract)
term
multilink
definition

ordered aggregation of links which are at the same level, are connected in sequence, and share the same functional classification, form of way, direction of travel, and perhaps additional characteristics

EXAMPLE Each link is contained in exactly one multilink.

standard (extract)
term
major link
definition

directed link in a road network

standard (extract)
term
“from” node
definition

node at the end of a link away from which the link is topologically oriented

NOTE See also “to” node, origin node, destination node, source node, and target node. When a link is travelled in the direction of topological orientation, the “from” node is the origin node. When it is travelled in the direction opposite topological orientation, the “from” node is the destination node.

standard (extract)
term
“to” node
definition

node at the end of a link towards which the link is topologically oriented

NOTE See also “from” node, origin node, destination node, source node, and target node. When a link is travelled in the direction of topological orientation, the “to” node is the destination node. When it is travelled in the direction opposite topological orientation, the “to” node is the origin node.

standard (extract)
term
origin node
definition

node at the end of a link from which travel takes place

NOTE See also destination node, “from” node, “to” node, source node, and target node. When a link is travelled in the direction of topological orientation, the origin node is the “from” node. When it is travelled in the direction opposite topological orientation, the origin node is the “to” node.

standard (extract)
term
target node
definition

node at the end of a link towards which exploration takes place for route calculation

NOTE See also source node, origin node, destination node, “from” node, and “to” node. When forward exploration is taking place from the origin of the route, the target node of a link is its destination node. When reverse exploration is taking place from the destination of the route, the target node of a link is its origin node.

standard (extract)
term
source node
definition

node at the end of a link from which exploration takes place for route calculation

NOTE See also target node, origin node, destination node, “from” node, and “to” node. When forward exploration is taking place from the origin of the route, the source node of a link is its origin node. When reverse exploration is taking place from the destination of the route, the source node of a link is its destination node.

standard (extract)
term
destination node
definition

node at the end of the link toward which travel takes place

NOTE See also origin node, “from” node, “to” node, source node, and target node. When a link is travelled in the direction of topological orientation, the destination node is the “to” node. When it is travelled in the direction opposite topological orientation, the destination node is the “from” node.

standard (extract)
term
degree
definition

number of edges which are incident with a particular Node

standard (extract)
term
valency degree
definition

number of edges which are incident with a particular Node

standard (extract)
term
node identifier
definition

identifier assigned to a node

NOTE 1 to entry: A node identifier can be arbitrary, or can be assigned by convention, to ensure that multiple occurrences of the same identifier will not occur within one network or within the universe of similar networks or databases.

standard (extract)
term
location
definition

simple or compound geographic object to be referenced by a location reference

NOTE 1 to entry: A location is matched to database objects by location definitions, which specify what is meant by a particular location. Without any explicit remark, it is meant to be a linear stretch in terms of topology in the database network without any loops or discontinuities in between (linear location). It might also be only a point in the network as a specialization of a linear stretch with length zero. In addition to that, a location can also be a set of road elements representing an area. This area is expressible by a polygon or a list of linear locations.

standard (extract)
term
exclave
definition

small part of an area enclosed by another area, seen from the enclosing area

standard (extract)
term
enclave
definition

small part of an area enclosed by another area, seen from the area to which that part belongs

standard (extract)
term
dynamic location reference (DLR)
definition

location reference generated on-the-fly based on geographic properties in a digital map database

NOTE Also known as DLR1 because this is the first LRM under dynamic profile.

standard (extract)
term
location reference core
definition

point or set of points that is available in any location reference

standard (extract)
term
linear location
definition

location that has a one-dimensional character

EXAMPLE A road segment.

standard (extract)
term
location referencing method (LRM)
definition

methodology of assigning location references to locations

standard (extract)
term
location referencing system (LRS)
definition

complete system by which location references are generated, according to a location referencing method, and communicated, including standards, definitions, software, hardware, and databases

standard (extract)
term
place
definition

named area which can be used as part of address location

term
location reference (LR)
definition

reference label which is assigned to a location

NOTE 1 to entry: With a single LRM, one reference shall define unambiguously and exactly one location in the location referencing system. The reference is the string of data which is passed between different implementations of a location referencing system to identify the location.

standard (extract)
term
point location
definition

location that has a zero-dimensional character

EXAMPLE A simple crossing.

standard (extract)
term
area location
definition

two-dimensional location, representing a geographical region on the surface of the earth

standard (extract)
term
offset
definition

pair of values subtracted from all coordinate values in order to shorten these coordinate values

standard (extract)
term
pre-coded location reference
definition

location reference using a unique identifier that is agreed upon in both sender and receiver system to select a location from a set of pre-coded locations

standard (extract)
term
coordinate
definition

one of an ordered set of N numbers designating the position of a point in N-dimensional space

NOTE 1 to entry: N would be 1, 2, or 3.

standard (extract)
term
postal code
definition

data model entity for a government-designated code used to specify regions for addressing

NOTE Postal code is related to link, navigable feature name, place, and POI.

standard (extract)
term
location reference extension
definition

additional point or set of points, not belonging to the location reference core, available in a location reference under special conditions

standard (extract)
term
standard location references
definition

standardized method for referencing geographic locations including points, links between points and geographic areas

standard (extract)
term
extension point (EP)
definition
standard (extract)
term
status location
definition

location to be used to position location-based status information

EXAMPLE A location for speed limit information or traffic level information.

standard (extract)
term
address type
definition

attribute of road section entity that specifies the type of house number ranges

EXAMPLE Distinction between base address, county address, commercial address, etc., or no address.

standard (extract)
term
place level
definition

level associated with places of place classification “administrative subdivision”

NOTE Higher/lower level situations are constituted by the occurrence of a parent/child place relationship between places.

standard (extract)
term
reverse geocoding
definition

determination of the address description of a link or node, i.e. determination of an upwards path across the place tree

standard (extract)
term
place class
definition

attribute of place entity, classifying into highest administrative or geographic division, administrative subdivision, postal, or colloquial (e.g. regions or neighbourhoods)

NOTE Place class can be partially ordered as “place class A is below place class B“. This does not imply strict or complete containment.

standard (extract)
term
link location
definition

location identifiable by a part of the road network database having one identifier or having a uniquely identifiable combination of attributes throughout the continuous stretch

NOTE 1 to entry: One link location can consist of multiple links.

standard (extract)