Terrain and Obstacle Data (Phase 2 P-13 P-14)
The requirements for electronic Terrain and Obstacle Data (TOD) are listed in ICAO Annex 15 (Aeronautical Information Services), Chapter 10.
The requirements are for a State to ensure the availability of electronic TOD, in accordance with stringent numerical requirements established for 4 distinct Areas of the State territory, over which AIS is provided. These areas are:
- Area 1: the entire territory of a State.
- Area 2: within the vicinity of an aerodrome, sub-divided in 4 smaller sections.
- Area 3: the area bordering an aerodrome movement area that extends horizontally from the edge of a runway to 90m from the runway centre line and 50m from the edge of all other parts of the aerodrome movement area.
- Area 4: the area extending 900m prior to the runway threshold and 60m each side of the extended runway centre line in the directions of the approach on a precision approach runway, category II or III.
The combination of the numerical requirements for both Terrain and Obstacle data on one side and the 4 coverage Areas throughout the State territory on the other side produces a complex requirement matrix compounded with different implementation target dates for States.
- From November 2008 States shall provide:
- Electronic terrain data for Area 1
- Electronic obstacle data for Area 1 (all obstacles higher then 100m above ground)
- Electronic terrain and obstacle data for Area 4 (for all runways where precision approach Category II or III operations have been established and where detailed terrain information is required by operators to enable them to assess the effect of terrain on decision height determination by use of radio altimeters)
Check the latest status of TOD implementation in ECAC:
From 12 November 2015, at aerodromes regularly used by international civil aviation, electronic obstacle data shall be provided for all obstacles within Area 2 that are assessed as being a hazard to air navigation.
From 12 November 2015, at aerodromes regularly used by international civil aviation, electronic terrain and obstacle data shall be provided for:
- Area 2a , for those obstacles that penetrate the relevant obstacle data collection surface specified in Appendix 8;
- penetrations of the take-off flight path area obstacle identification surfaces; and
- penetrations of the aerodrome obstacle limitation surfaces.
A Terrain and Obstacle Data Working Group (TOD WG) was established in 2006. The main focus of the group is to support ECAC States with the implementation the requirements for Terrain and Obstacles according to ICAO Annex 15, Chapter 10. All documentation concerning the meetings of this group is available on OneSky Teams.
The TOD Manual has been developed to provides assistance to those tasked with implementing electronic terrain and obstacle data (eTOD). It is intended to be used by those bodies involved in the origination, processing and provision of electronic terrain and obstacle data, from the point at which the need for origination is identified, through to the point when the State makes it available in accordance with the requirements of ICAO Annex 15. The current edition is 2.0 which was released in the autumn of 2011.
The TOD manual is a living document, updated by the TOD WG as experience grows during implementation. In order to ensure that this document can continue to meet stakeholder needs, it is important that comments on the document and any issues identified as not being adequately addressed are brought to the attention of EUROCONTROL.
If you have any questions about (electronic) Terrain and Obstacle Data which are insufficiently covered by the TOD Manual, the eTOD Forum is a good place to ask them.
The eTOD Forum is a means for experts to exchange views and share experience. These experts are mainly AIS staff, surveyors, flight procedure designers, data providers, military and industry.
The implementation of the TOD requirements as stated by ICAO Annex 15 requires the collection and survey of a relatively large amount of terrain and obstacle data. In order to support Members States in the production and management of this data, EUROCONTROL has developed the TOD Manual. In order to further consolidate this manual, EUROCONTROL commissioned a feasibility study in order to evaluate the TOD Manual in view of putting eTOD into practice. The performed tasks, findings and recommendations (made by a consortium of French and Swiss ANSP's and Regulators) have been summarized in the Pilot Study Report.