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that are considered hazardous to air navigation. Obstacle data
shall comprise the .digrtal representation of the vertical and
horizontal extent. of man-made objects. Obstacles shall not be
included in terrain databases. Obstacle data elements are features
that shall be represented in the database by points, lines
or polygons.
10.4.2 Obstacles, which in accordance with the definition,
can be fixed (permanent or temporary) or mobile shall be identified
within the areas defined in 10.2, on the basis of the
obstacle data collection surfaces and criteria specified in
Appendix 8, Figure A8-2, and collected in accordance with
obstacle data numerical requirements provided in Table A8-2
of Appendix 8. In an obstacle database, all defined obstacle
feature types shall be recorded and- each of them shall be
described according to the list of mandatory attributes provided
in Table A8-4 of Appendix 8.
Note.- Speclpc attributes associated with mobile fleature
operations) and temporary types of obstacles are annotated in
Appendix 8, Table A8-4, as optional attributes. lfthese types
of obstacles are to be recorded in the database, appropriate
attributes describing such obstacles are also required.
10.5 Terrain and obstacle data
product specifications
10.5.1 To allow and support the interchange and use of
sets of electronic terrain and obstacle data among different
data providers and data users, the IS0 19100 series of standards
for geographic information shall be used as a general
data modelling framework.
10.5.2 A comprehensive statement of available electronic
terrain and obstacle data sets shall be provided in the form of
terrain data product specifications as well as obstacle data
product specifications on which basis air navigation users will
be able to evaluate the products and determine whether they
fulfil the requirements for their intended use (application).
Note.- IS0 Standard 1913 1 specifies the requirements
and outline of data product specijcations for geographic
information.
10.5.3 Each terrain data product specification shall
include an overview, a specification scope, data product identification,
data content and structure, reference system, data
quality, data capture, data maintenance, data pomayal, data
product delivery, additional information, and metadata.
10.5.4 The overview of terrain data product specification
or obstacle data product specification shall provide an informal
description of the product and shall contain general information
about the data product. Specification of terrain data
may not be homogenous across the whole data product but
may vary for different parts of the data sets. For each such
subset of data, a specification scope shall be identified.
Identification information concerning both terrain and obstacle
data products shall include the title of the product; a brief narrative
summary of the content, purpose, and spatial resolution
if appropriate (a general statement about the density of spatial
data); the geographic area covered by the data product; and
supplemental information.
10.5.5 Content information of feature-based terrain data
sets or of feature-based obstacle data sets shall each be
described in terms of an application schema and a feature
catalogue. Application schema shall provide a formal description
of the data structure and content of data sets while the
feature catalogue shall provide the semantics of all feature
types together with their amibutes and attribute value
domains, association types between feature types and feature
operations, inheritance relations and constraints. coverage is
considered a subtype of a feature and can be derived from a
collection of features that have common attributes. Both terrain
and obstacle data product specifications shall identify
clearly the coverage andlor imagery they include and shall
provide a narrative description of each of them.
Note I . - IS0 Standard 19109 contains rules for application
schema while IS0 Standard 19110 describes feature
cataloguing methodology for geographic information.
Chapter 10 Annex IS - Aeronautical Information Services
Note 2.- IS0 Standard 19123 contains schema for coverage
geometry andfirnctions.
10.5.6 Both terrain data product specifications and obstacle
data product specifications shall include information that identifies
the reference system used in the data product. This shall
include the spatial reference system and temporal reference system.
Additionally, both data product specifications shall identify
the data quality requirements for each data product. This shall
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