ISO 19126:2021 Geographic information — Feature concept dictionaries and registers

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Geographic information — Feature concept dictionaries and registers

1 Scope

This document specifies a schema for feature concept dictionaries to be established and managed as registers. It does not specify schemas for feature catalogues or for the management of feature catalogues as registers. However, as feature catalogues are often derived from feature concept dictionaries, this document does specify a schema for a hierarchical register of feature concept dictionaries and feature catalogues. These registers are in accordance with ISO 19135-1.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 19103:2015, Geographic information — Conceptual schema language

ISO 19115-1, Geographic information — Metadata — Part 1: Fundamentals

ISO 19135-1:2015, Geographic information — Procedures for item registration — Part 1: Fundamentals

3 Terms a nd definiti ons

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www. iso .org/o bp

— IEC Electropedia: available at http://w ww .electropedia .org/ 3.1

compound registry

registry (3.20) containing multiple registers (3.19) that share the same item classes (3.17) and coordinated management of a common characteristic

Note 1 to entry: The common characteristic can be a shared namespace for the assignment of names and/or codes.

3.2

data product

dataset or dataset series that conforms to a data product specification (3.3)

[SOURCE: ISO 19131:2007, 4.6]

3.3

d at a pr o duc t s p e c i f ic at ion

detailed description of a dataset or dataset series together with additional information that will enable it to be created, supplied to and used by another party

[SOURCE: ISO 19131:2007, 4.7, modified — The Note has been removed.]

3.4

data type

specification of a value domain (3.22) with operations allowed on values in this domain

[SOURCE: ISO 19103:2015, 4.14, modified — Note 1 to entry and the Example have been removed.]

3.5

feature

abstraction of real world phenomena

EXAMPLE The phenomenon named “Eiffel Tower” may be classified with other similar phenomena into a feature type named “tower”.

Note 1 to entry: A feature can occur as a type or an instance. In this document, feature type is meant unless otherwise specified.

Note 2 to entry: This document does not address real world phenomena directly. It addresses only their abstractions (feature concepts and feature types) and feature instances (data collected to represent a feature in conformance with a specified feature type).

[SOURCE: ISO 19101-1:2014, 4.1.11, modified — Note 2 to entry and the Example have been added.]

3.6

feature association

relationship that links instances of one feature (3.5) type with instances of the same or a different feature type

Note 1 to entry: A feature association can occur as a type or an instance. In this document, feature association type is meant unless otherwise specified.

[SOURCE: ISO 19110:2016, 3.3 modified — Note 1 to entry has been added.]

3.7

feature association concept

concept that can be specified in detail as one or more feature association (3.6) types

EXAMPLE A “supports” feature association concept describes a relationship between real world phenomena such as “highways” and “bridges” where the role of one feature is that it is supported-by the other feature (whose role is supporter-of ).

3.8

feature attribute

characteristic of a feature

EXAMPLE 1 A feature attribute named “colour” can have an attribute value “green” which belongs to the data type “text”.

EXAMPLE 2 A feature attribute named “length” an have an attribute value “82,4” which belongs to the data type “real”.

Note 1 to entry: A feature attribute has a name, a data type and a value domain associated to it. A feature attribute for a feature instance also has an attribute value taken from the value domain.

Note 2 to entry: A feature attribute can occur as a type or an instance. In this document, feature attribute type is meant unless otherwise specified.

[SOURCE: ISO 19101-1:2014, 4.1.12, modified — Note 2 to entry has been changed and Note 3 to entry has been removed.]

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