CEN/TC 287
The Geographic Inforrmation documents listed hereafter have been prepared by Technical Committee CEN/TC 287 chaired by M. François Salgé (IGN, France) and adopted in 1997 et 1998 as European Prestandrads (ENVs) or CEN Reports (CRs).
ENVs are established as prospective standards for provisional application in technical fields where the innovation rate is high or where there is an urgent need for guidance and primarily where the safety of persons or goods is not involved.
ENVs do not have to be adopted by the members (but they must be announced and made available).
The life of an ENV is limited to three years. After two years the CEN/CS will take action by requesting members to send their comments on that ENVs within six months.
In order to provide information the Technical Board of CEN may adopt a report by a simple majority decision.
Full text of ENVs are available at your CEN Member
| Reference | Title | Summary (Scope) |
| ENV 12009:1997 | Geographic Information - Reference Model |
ENV 12009:1997 describes the basis of
the whole area of standardisation for geographic information,
stating the main items of interest and how they interrelate. It
identifies and defines a structured set of concepts and components
enabling the definition, description, querying and updating, and
the transfer of geographic information and information about
geographic information.
The reference model for geographic information provides a framework for development of standards in this field. |
| ENV 12160:1997 | Geographic Information - Data description - Spatial schema |
ENV 12160 establishes the principles
for defining spatial schemas. The spatial schema specifies the
primitives and their constructs for representing geometry and
topology of geographic objects. The geometry of an object is
represented by geometric primitives. An object may be modelled as
a geometric primitive such as a point, a line, a face or a volume
in a two or three dimensional space. The topology or relative
position of objects is represented by structure primitives.
The geometry concepts defined in ENV 12160 are as follows : points, lines, arcs (in particular circular arcs, bsplines, clotoides) and surfaces ; shortest ways between two given points in a surface ; pixel, raster band, grid. The topological concepts defined in ENV 12160 are : nodes, edges and faces. Outside the scope of ENV 12160 are higher dimensional manifolds, e.g. three-dimensional bodies and their volumes, and higher dimensional complexes. |
| ENV 12656:1998 | Geographic Information - Data description - Quality | ENV 12656 establishes the general principles for describing the quality of geographic information. It is concerned with presenting information appropriate for judging the quality of geographic information. This includes details of the derivation and usage of particular datasets and quantitative measures of quality, either against a pre-established scale or relative to similar information. The purpose of describing the quality of geographic information is to allow producers to define how well their data product meets its specification, and for users to define their requirements in the same way. |
| ENV 12657:1998 | Geographic Information - Data description - Metadata | ENV 12657 defines a conceptual schema for metadata for geographic datasets. Metadata is data about datasets. It includes information about the content, representation, extent (both geometric and temporal), spatial reference system, quality and administration of the dataset. ENV 12657 identifies those items that are mandatory for describing geographic datasets - the minimum set of metadata. It gives examples of how the standard may be applied but does not concern itself with the construction of databases for holding metadata. It is designed primarily for use with digital geographic datasets, but the principles can also be used to describe geographic information in other forms such as paper maps or lists. |
| ENV 12658:1998 | Geographic Information - Data description - Transfer |
ENV 12658 defines the transfer
schemas, implementation mechanisms and encoding rules for the
transfer of geographic data. It allows users to transfer spatial
and non-spatial components of geographic information, together
with their data dictionary and metadata. The data dictionary
contains a formal description of the application schema for the
data being transferred. This data dictionary complements the
description of the data that exists in the metadata as defined in
the metadata standard.
ENV 12658 contains conceptual schema for encoding an application schema into the data dictionary, encoding data into an exchange structure and incorporating external files. It also contains examples of its use. |
| ENV 12661:1998 | Geographic Information - Referencing systems - Geographic identifiers |
ENV 12661 describes methods of
documenting and disseminating systems for spatial referencing
using geographic identifiers.
ENV 12661 specifies how systems of spatial references using geographic identifiers are described, and defines the contents of a gazetteer of locations. It enables producers of data to define locations in a consistent manner, and assists users to understand the spatial references used in datasets. It also enables gazetteers of instances of locations to be constructed in a consistent manner. |
| ENV 12762:1998 | Geographic Information - Referencing systems - Direct Position |
ENV 12762 defines the basic concepts
related to position information based on coordinates and defines
how that position information may be described and identified. The
choice of any particular system is outside the scope of ENV
12762.
ENV 12762 will enable geodetic referencing systems to be described in such a manner that data can be transformed from one reference system to another, enabling integration of datasets. |
| pr ENV 13376 | Geographic Information - Rules for application schema |
ENV 13376 defines the rules about the
use of the data description techniques for developing application
schemas for geographic information.
ENV 13376 describes how the user can define entities and their properties in an application schema. It also explains how to integrate the standardized schemas (spatial, quality, position, geographic identifiers) with the application-dependent schemas (semantic, quality constraint) into a full application schema. |
| CR 13425 | Geographic Information - Overview | CR 13425 provides an overview of the family of European Prestandards (ENVs) for geographic information. It describes the areas of application to which those ENVs apply, and explains the overall context within which the family will operate. |
| CR 13436 | Geographic Information - Vocabulary |
CR 13436 contains all terms and
definitions used in the Geographic Information European
Prestandards. It establishes a harmonised concept system that will
aid the development of standards for the representation of
geographic information, along with the necessary mechanisms and
definitions to enable geographic data to be transferred. It is
applicable to any standard relating to geographic
information.
Each individual ENV contains its own relevant definitions |
contact : marie-claire.franon@email.afnor.fr