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|  MIL-D-89009
Geometric primitive. The basic geometric units of
representation; specifically, nodes, edges, and faces.
Georelational data model. A generic conceptual model in
which geographic information is represented by using a combination
of vector geometry and planar, topology, and relational data
models.
Index. A mechanism used to quickly identify a particular
record or group of records based on a table's primary key.
Index file. The implementation of an index stored in a file
instead of a table. There are row id indexes, variable-length
indexes, spatial indexes, and thematic indexes.
Inner ring. The inner boundary of a face, composed of edges
ordered in a sequence. A face may have none or any arbitrary
number of inner rings. The inner rings have the opposite edge
order sequence from the outer ring.
Integrated data. A geographic data set in which all feature
data are contained in a single coverage. Opposite of layered
data.
Jet Navigation Chart A 1:2,000,000 scale coordinated series
of multicolored charts designed to satisfy the long-range
navigation requirements of high-altitude, high-speed aircraft.
Key. In a relational data model, one or more columns
(attributes) whose values uniquely identify or can be used to
select a row.
Layered data. Feature data thematically separated into
separate coverages. Opposite of integrated data.
Left edge. The left edge is the first neighbor of the
current edge as one moves counterclockwise around the start node
of the current edge.
Left face. The face to the left of an edge in a traverse
from the start node to the end node.
Levels of topology.
See topology.
Library. A collection of one or more coverages contained
within a specified spatial extent, all of which share a single
coordinate system. Coverages may be tiled in a library. All
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