# Commission Implementing Regulation (EU) 2017/373 of 1 March 2017 laying down common requirements for providers of air traffic management/air navigation services and other air traffic management network functions and their oversight, repealing Regulation (EC) No 482/2008, Implementing Regulations (EU) No 1034/2011, (EU) No 1035/2011 and (EU) 2016/1377 and amending Regulation (EU) No 677/2011 (Text with EEA relevance), Division: AIS.TR.355 Terrain data sets

Extent: E+W+S+N.I.

When terrain data sets are provided in accordance with point AIS.OR.355:
(a)terrain data sets shall contain the digital representation of the terrain surface in the form of continuous elevation values at all intersections of a defined grid, referenced to a common datum;
(b)a terrain grid shall be angular or linear and shall be of a regular or irregular shape;
(c)terrain data sets shall include spatial (position and elevation), thematic, and temporal aspects of the surface of the Earth, containing naturally occurring features, excluding obstacles;
(d)only one feature type, i.e. terrain, shall be provided;
(e)the following terrain feature attributes shall be recorded in the terrain data set:
(1)area of coverage;
(2)identification of the data originator;
(3)data source identifier;
(4)acquisition method;
(5)post spacing;
(6)horizontal reference system;
(7)horizontal resolution;
(8)horizontal accuracy;
(9)horizontal confidence level;
(10)horizontal position;
(11)elevation;
(12)elevation reference;
(13)vertical reference system;
(14)vertical resolution;
(15)vertical accuracy;
(16)vertical confidence level;
(17)recorded surface;
(18)integrity;
(19)date and time stamp; and
(20)unit of measurement used;
(f)within the area covered by a 10-km radius from the ARP, terrain data shall comply with the Area 2 numerical requirements;
(g)in the area between 10 km and the TMA boundary or a 45-km radius, whichever is smaller, data on terrain that penetrates the horizontal plane 120 m above the lowest runway elevation shall comply with the Area-2 numerical requirements;
(h)in the area between 10 km and the TMA boundary or a 45-km radius, whichever is smaller, data on terrain that does not penetrate the horizontal plane 120 m above the lowest runway elevation shall comply with the Area-1 numerical requirements; and
(i)in those portions of Area 2 where flight operations are prohibited due to very high terrain or other local restrictions or other local restrictions or regulations, terrain data shall comply with the Area 1 numerical requirements.
The following diagram contains a graphical illustration of Area 1 and Area 2 terrain data collection surfaces:
Terrain data collection surfaces – Area 1 and Area 2

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Source: https://www.legislation.gov.uk/eur/2017/373/annex/VI/division/2/division/Chapter/division/5n1 (the official version)
Page: https://openlegislation.uk/eu-regulation-2017-373/annex-VI/division-2/division-Chapter/division-5n1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.