105 terrain and obstacle data product specifications

in Table A8-4 of Appendix 8.
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 ISO 19100
series of standards for geographic information shall be used as a general data
modeling 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 fulfill the
requirements for their intended use (application).
Note.— ISO Standard 19131 specifies the requirements and outline of data
product specifications 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
portrayal, 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

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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
attributes 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 and/or imagery they include
and shall provide a narrative description of each of them.
Note 1. — ISO Standard 19109 contains rules for application schema while
ISO Standard 19110 describes feature cataloguing methodology for
geographic information.