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air navigation.
Aeronautical information service (AZS). A service established
within the defined area of coverage responsible for the provision
of aeronautical informatioddata necessary for the
safety, regularity and efficiency of air navigation.
AZP Amendment. Permanent changes to the information
contained in the AIP.
AZP Supplement. Temporary changes to the information
contained in the AIP which are published by means of
special pages.
AZRAC. An acronym (aeronautical information regulation and
control) signifying a system aimed at advance notification
based on common effective dates, of circumstances that
necessitate significant changes in operating practices.
Air defence identification zone (ADZZ). Special designated
airspace of defined dimensions within which aircraft are
required to comply with special identification andlor
reporting procedures additional to those related to the
provision of air traffic services (ATS).
Canopy. Bare Earth supplemented by vegetation height.
Culture. All man-made features constructed on the surface of
the Earth, such as cities, railways and canals.
Cyclic redundancy check (CRC). A mathematical algorithm
applied to the dig~tal expression of data that provides a
level of assurance against loss or alteration of data.
Danger area. An airspace of defined dimensions within which
activities dangerous to the flight of aircraft may exist at
specified times.
Database. One or more files of data so structured that
appropriate applications may draw from the files and
update them.
Note.- This primarily refers to data stored electronically
and accessed by computer rather than in files of
physical records.
* All IS0 Standards are listed at the end of this chapter.
ANNEX 15 2-1
Annex 15 - Aeronautical Information Services Chapter 2
Data product. Data set or data set series that conforms to a
data product specification (IS0 191 3 1 *).
Data product specification. Detailed description of a data set
or data set series together with additional information that
will enable it to be created, supplied to and used by another
party (IS0 19131*).
Note.- A data product specification a description
of the universe of discourse and a specification for
mapping the universe of discourse to a data set. It may be
used for production, sales, end-use or other purpose.
Data qualify. A degree or level of confidence that the data
provided meets the requirements of the data user in terms
of accuracy, resolution and integrity.
Data set. Identifiable collection of data (IS0 191 01 *).
Data set series. Collection of data sets sharing the same
product specification (IS0 19 11 5*).
Datum. Any quantity or set of quantities that may serve as a
reference or basis for the calculation of other quantities
(IS0 19104*).
Digital Elevation Model (DEM). The representation of terrain
surface by continuous elevation values at all intersections
of a defined grid, referenced to common datum.
Note.- Digital Terrain Model (DTM) is sometimes
referred to as DEM.
Direct transit arrangements. Special arrangements approved
by the public authorities concerned by which traffic which
is pausing briefly in its passage through the Contracting
State may remain under their direct control.
Ellipsoid height (Geodetic height). The height related to the
reference ellipsoid, measured along the ellipsoidal outer
normal through the point in question.
Feature. Abstraction of real world phenomena (IS0 19101*).
Feature attribute. Characteristic of a feature (IS0 191 01 *).
Note.- A feature attribute has a name, a data type and
a value domain associated with it.
Feature operation. Operation that every instance of a feature
type may perform (IS0 19 11 O*).
Note.- An operation upon the feature type dam is to
raise the dam. The result of this operation is to raise the
level of water in the reservoir
Feature relationship. Relationship that links instances of one
feature type with instances of the same or a different feature
type (IS0 19101*).
Feature fype. Class of real world phenomena with common
properties (IS0 191 1 O*).
Note.- In a feature catalogue, the basic level of
classifcation is the feature type.
Geodesic distance. The shortest distance between any two
points on a mathematically defined ellipsoidal surface.
Geodetic datum. A minimum set of parameters required to
define location and orientation of the local reference system
with respect to the global reference systernlframe.
Geoid The equipotential surface in the gravity field of the
Earth which coincides with the undisturbed mean sea level
　
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