SIST EN ISO 19123:2007

SLOVENSKI STANDARD
SIST EN ISO 19123:2007
01-junij-2007
Geografske informacije – Shema za geometrijo podatkovnega sloja in funkcije (ISO
19123:2005)
Geographic information - Schema for coverage geometry and functions (ISO
19123:2005)
Geoinformation - Coverage Geometrie- und Funktionsschema (ISO 19123:2005)
Information géographique - Schéma de la géométrie et des fonctions de couverture (ISO
19123:2005)
Ta slovenski standard je istoveten z: EN ISO 19123:2007
ICS:
35.240.70 Uporabniške rešitve IT v IT applications in science
znanosti
SIST EN ISO 19123:2007 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN ISO 19123
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2007
ICS 35.240.70

English Version
Geographic information - Schema for coverage geometry and
functions (ISO 19123:2005)
Information géographique - Schéma de la géométrie et des Geoinformation - Coverage Geometrie- und
fonctions de couverture (ISO 19123:2005) Funktionsschema (ISO 19123:2005)
This European Standard was approved by CEN on 25 February 2007.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2007 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19123:2007: E
worldwide for CEN national Members.

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EN ISO 19123:2007 (E)






Foreword



The text of ISO 19123:2005 has been prepared by Technical Committee ISO/TC 211
"Geographic information/Geomatics” of the International Organization for Standardization (ISO)
and has been taken over as EN ISO 19123:2007 by Technical Committee CEN/TC 287
"Geographic Information", the secretariat of which is held by NEN.

This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by September 2007, and conflicting national
standards shall be withdrawn at the latest by September 2007.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium,
Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United
Kingdom.


Endorsement notice

The text of ISO 19123:2005 has been approved by CEN as EN ISO 19123:2007 without any
modifications.

2

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INTERNATIONAL ISO
STANDARD 19123
First edition
2005-08-15

Geographic information — Schema for
coverage geometry and functions
Information géographique — Schéma de la géométrie et des fonctions
de couverture




Reference number
ISO 19123:2005(E)
©
ISO 2005

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ISO 19123:2005(E)
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ii © ISO 2005 – All rights reserved

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ISO 19123:2005(E)
Contents Page
Foreword. v
Introduction . vi
1 Scope . 1
2 Conformance. 1
3 Normative references . 2
4 Terms, definitions, abbreviated terms and notation . 2
4.1 Terms and definitions. 2
4.2 Abbreviated terms . 7
4.3 Notation . 7
5 Fundamental characteristics of coverages.8
5.1 The context for coverages . 8
5.2 The coverage schema . 9
5.3 CV_Coverage. 10
5.4 CV_DomainObject. 13
5.5 CV_AttributeValues . 13
5.6 CV_CommonPointRule. 14
5.7 CV_DiscreteCoverage . 14
5.8 CV_GeometryValuePair. 15
5.9 CV_ContinuousCoverage . 16
5.10 CV_ValueObject . 17
5.11 CV_InterpolationMethod . 18
5.12 Subclasses of CV_ContinuousCoverage . 18
6 Discrete coverages. 18
6.1 Discrete coverage types . 18
6.2 CV_DiscretePointCoverage . 19
6.3 CV_PointValuePair. 20
6.4 CV_DiscreteGridPointCoverage. 20
6.5 CV_GridPointValuePair . 21
6.6 CV_DiscreteCurveCoverage . 21
6.7 CV_CurveValuePair . 22
6.8 CV_DiscreteSurfaceCoverage . 22
6.9 CV_SurfaceValuePair . 24
6.10 CV_DiscreteSolidCoverage . 24
6.11 CV_SolidValuePair. 24
7 Thiessen polygon coverage . 25
7.1 Thiessen polygon networks . 25
7.2 CV_ThiessenPolygonCoverage. 25
7.3 CV_ThiessenValuePolygon . 27
8 Quadrilateral grid coverages . 27
8.1 General. 27
8.2 Quadrilateral grid geometry. 27
8.3 CV_Grid. 30
8.4 CV_GridEnvelope. 31
8.5 CV_GridPoint. 31
8.6 CV_GridCoordinate. 32
8.7 CV_GridCell . 32
8.8 CV_Footprint . 33
8.9 CV_RectifiedGrid . 33
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ISO 19123:2005(E)
8.10 CV_ReferenceableGrid . 34
8.11 CV_ContinousQuadrilateralGridCoverage . 35
8.12 CV_GridValueCell. 36
8.13 CV_GridPointValuePair . 36
8.14 CV_GridValuesMatrix. 37
8.15 CV_SequenceRule . 38
8.16 CV_SequenceType. 38
9 Hexagonal Grid Coverages . 39
9.1 General . 39
9.2 CV_HexagonalGridCoverage . 39
9.3 CV_GridValuesMatrix. 41
9.4 CV_ValueHexagon . 41
10 Triangulated irregular network (TIN) coverages. 41
10.1 General . 41
10.2 CV_TINCoverage . 43
10.3 CV_ValueTriangle. 43
11 Segmented curve coverages . 44
11.1 General . 44
11.2 CV_SegmentedCurveCoverage . 45
11.3 CV_ValueCurve . 45
11.4 CV_ValueSegment . 46
11.5 Evaluation . 46
Annex A (normative) Abstract test suite. 47
Annex B (informative) UML Notation . 51
Annex C (informative) Interpolation methods. 56
Annex D (informative) Sequential enumeration. 60
Bibliography . 65

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ISO 19123:2005(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 19123 was prepared by Technical Committee ISO/TC 211, Geographic information/Geomatics.
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ISO 19123:2005(E)
Introduction
Geographic phenomena fall into two broad categories — discrete and continuous. Discrete phenomena are
recognizable objects that have relatively well-defined boundaries or spatial extent. Examples include buildings,
streams and measurement stations. Continuous phenomena vary over space and have no specific extent.
Examples include temperature, soil composition and elevation. A value or description of a continuous
phenomenon is only meaningful at a particular position in space (and possibly time). Temperature, for
example, takes on specific values only at defined locations, whether measured or interpolated from other
locations.
These concepts are not mutually exclusive. In fact, many components of the landscape may be viewed
alternatively as discrete or continuous. For example, a stream is a discrete entity, but its flow rate and water
quality index vary from one position to another. Similarly, a highway can be thought of as a feature or as a
collection of observations measuring accidents or traffic flow, and an agricultural field is both a spatial object
and a set of measurements of crop yield through time.
Historically, geographic information has been treated in terms of two fundamental types called vector data and
raster data.
“Vector data” deals with discrete phenomena, each of which is conceived of as a feature. The spatial
characteristics of a discrete real-world phenomenon are represented by a set of one or more geometric
primitives (points, curves, surfaces or solids). Other characteristics of the phenomenon are recorded as
feature attributes. Usually, a single feature is associated with a single set of attribute values. ISO 19107:2003
provides a schema for describing features in terms of geometric and topological primitives.
“Raster data”, on the other hand, deals with real-world phenomena that vary continuously over space. It
contains a set of values, each associated with one of the elements in a regular array of points or cells. It is
usually associated with a method for interpolating values at spatial positions between the points or within the
cells. Since this data structure is not the only one that can be used to represent phenomena that vary
continuously over space, this International Standard uses the term “coverage,” adopted from the Abstract
[1]
Specification of the Open GIS Consortium , to refer to any data representation that assigns values directly to
spatial position. A coverage is a function from a spatial, temporal or spatiotemporal domain to an attribute
range. A coverage associates a position within its domain to a record of values of defined data types.
In this International Standard, coverage is a subtype of feature. A coverage is a feature that has multiple
values for each attribute type, where each direct position within the geometric representation of the feature
has a single value for each attribute type.
Just as the concepts of discrete and continuous phenomena are not mutually exclusive, their representations
as discrete features or coverages are not mutually exclusive. The same phenomenon may be represented as
either a discrete feature or a coverage. A city may be viewed as a discrete feature that returns a single value
for each attribute, such as its name, area and total population. The city feature may also be represented as a
coverage that returns values such as population density, land value or air quality index for each position in the
city.
A coverage, moreover, can be derived from a collection of discrete features with common attributes, the
values of the coverage at each position being the values of the attributes of the feature located at that position.
Conversely, a collection of discrete features can be derived from a coverage, each discrete feature being
composed of a set of positions associated with specified attribute values.

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INTERNATIONAL STANDARD ISO 19123:2005(E)

Geographic information — Schema for coverage geometry and
functions
1 Scope
This International Standard defines a conceptual schema for the spatial characteristics of coverages.
Coverages support mapping from a spatial, temporal or spatiotemporal domain to feature attribute values
where feature attribute types are common to all geographic positions within the domain. A coverage domain
consists of a collection of direct positions in a coordinate space that may be defined in terms of up to three
spatial dimensions as well as a temporal dimension. Examples of coverages include rasters, triangulated
irregular networks, point coverages and polygon coverages. Coverages are the prevailing data structures in a
number of application areas, such as remote sensing, meteorology and mapping of bathymetry, elevation, soil
and vegetation. This International Standard defines the relationship between the domain of a coverage and an
associated attribute range. The characteristics of the spatial domain are defined whereas the characteristics of
the attribute range are not part of this standard.
2 Conformance
This International Standard specifies interfaces for several types of coverage objects. In addition, it supports
the interchange of coverage data independently of those interfaces. Thus, it specifies two sets of conformance
classes: one for implementation of the interfaces, the other for the exchange of coverage data. Each set
includes one conformance class for each type of coverage specified in this International Standard (Table 1).
Table 1 — Conformance classes
Conformance class Subclause
Simple coverage interface A.1.1
Discrete coverage interface A.1.2
Thiessen polygon coverage interface A.1.3
Quadrilateral grid coverage interface A.1.4
Hexagonal grid coverage interface A.1.5
TIN coverage interface A.1.6
Segmented curve coverage interface A.1.7
Discrete coverage interchange A.2.1
Thiessen polygon coverage interchange A.2.2
Quadrilateral grid coverage interchange A.2.3
Hexagonal grid coverage interchange A.2.4
TIN coverage interchange A.2.5
Segmented curve coverage interchange A.2.6
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ISO 19123:2005(E)
In general, the interface conformance classes require implementation of all attributes, associations and
operations of relevant classes. This set includes a single conformance class (A.2.1) that supports a simple
interface for evaluation of any coverage type, but exposes none of the internal structure of the coverage. The
remainder of the set are conformance classes that support interfaces to specific coverage types that expose
additional information about the internal structure of the coverage.
The interchange conformance classes require only implementation of the attributes and associations of the
relevant classes.
The Abstract Test Suite in Annex A shows the implementation requirements necessary to conform to this
International Standard. Table 1 lists the subclauses of the Abstract Test Suite that apply for each conformance
class.
3 Normative references
The following referenced documents are indispensable for the application 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/TS 19103:2005, Geographic information — Conceptual schema language
ISO 19107:2003, Geographic information — Spatial schema
ISO 19108:2002, Geographic information — Temporal schema
ISO 19109:2005, Geographic information — Rules for application schema
ISO 19111:2003, Geographic information — Spatial referencing by coordinates
ISO 19115:2003, Geographic information — Metadata
4 Terms, definitions, abbreviated terms and notation
4.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
4.1.1
continuous coverage
coverage that returns different values for the same feature attribute at different direct positions within a
single spatial object, temporal object or spatiotemporal object in its domain
NOTE Although the domain of a continuous coverage is ordinarily bounded in terms of its spatial and/or temporal
extent, it can be subdivided into an infinite number of direct positions.
4.1.2
convex hull
smallest convex set containing a given geometric object
[2]
[adapted from Dictionary of Computing:1996 ]
4.1.3
convex set
geometric set in which any direct position on the straight-line segment joining any two direct positions in
the geometric set is also contained in the geometric set
[2]
[Dictionary of Computing:1996 ]
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ISO 19123:2005(E)
4.1.4
coordinate
one of a sequence of n numbers designating the position of a point in n-dimensional space
[ISO 19111:2003]
4.1.5
coordinate dimension
number of measurements or axes needed to describe a position in a coordinate system
[ISO 19107:2003]
4.1.6
coordinate reference system
coordinate system that is related to the real world by a datum
[ISO 19111:2003]
41.7
coverage
feature that acts as a function to return values from its range for any direct position within its spatial,
temporal or spatiotemporal domain
EXAMPLE Examples include a raster image, polygon overlay or digital elevation matrix.
NOTE In other words, a coverage is a feature that has multiple values for each attribute type, where each direct
position within the geometric representation of the feature has a single value for each attribute type.
4.1.8
coverage geometry
configuration of the domain of a coverage described in terms of coordinates
4.1.9
curve
1-dimensional geometric primitive, representing the continuous image of a line
[ISO 19107:2003]
NOTE The boundary of a curve is the set of points at either end of the curve.
4.1.10
Delaunay triangulation
network of triangles such that the circle passing through the vertices of any triangle does not contain, in its
interior, the vertex of any other triangle
4.1.11
direct position
position described by a single set of coordinates within a coordinate reference system
[ISO 19107:2003]
4.1.12
discrete coverage
coverage that returns the same feature attribute values for every direct position within any single spatial
object, temporal object or spatiotemporal object in its domain
NOTE The domain of a discrete coverage consists of a finite set of spatial, temporal, or spatiotemporal objects.
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ISO 19123:2005(E)
4.1.13
domain
well-defined set
[ISO/TS 19103]
NOTE Domains are used to define the domain and range of operators and functions.
4.1.14
evaluation
〈coverage〉 determination of the values of a coverage at a direct position within the domain of the coverage
4.1.15
feature
0 abstraction of real world phenomena
[ISO 19101]
4.1.16
feature attribute
characteristic of a feature
[ISO 19101]
4.1.17
function
rule that associates each element from a domain (source or domain of the function) to a unique element in
another domain (target, co-domain or range)
[ISO 19107:2003]
4.
...