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|  MIL-D-89009
Names placement coverage. A coverage that contains (at a
minimum) a point feature table with columns indicating a place
name and its known coordinate. Used to help a user locate places
by name.
NaN. Stands for not a number.
Used as a floating point null
value in VPF.
Neutral format. A characteristic of a data model that does
not contain product-specific information.
Node. A zero-dimensional geometric primitive that is
composed of a single coordinate tuple (pair or triplet). There
are two types of nodes: entity nodes and connected nodes.
Operational Navigation Chart A chart at scale 1:1,000,000
that is designed for both general navigation and special military
operations.
Outer ring. The outermost boundary of a face, composed of
edges ordered in a sequence. The outer ring has the opposite edge
order sequence from the inner rings.
Pathname.
A file specification that uniquely identifies the
location path to a file within a series of one or more
directories.
Planar model. A planar model is a two-dimensional surface in
which every point has a neighborhood (a two-dimensional region)
that is topologically equal to a flat disk. It is implemented as
a planar graph {N, E, F} with a finite number of nodes N = {n1,
n2,...}, edges E = {e1, e2,...}, and faces A = {f1, f2,...}
bounded by edges and nodes. Each edge has an orientation from its
first (starting) coordinate tuple to its last coordinate tuple.
Also, each face of the graph has a certain orientation (cycle)
around its edges and nodes. Each edge of a planar model is
incident with exactly two faces.
Point feature. A geographic entity that defines a zero-
dimensional location; for example, a well or a building.
Point feature class. A collection of point features that
maintains a homogeneous set of attributes. Composed of node
primitives.
Point feature table. The implementation of a point feature
class in a VPF attribute table.
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