Division AIS.TR.355 Terrain data setsF1

When terrain data sets are provided in accordance with point AIS.OR.355:

1. (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;

2. (b)

   a terrain grid shall be angular or linear and shall be of a regular or irregular shape;

3. (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;

4. (d)

   only one feature type, i.e. terrain, shall be provided;

5. (e)

   the following terrain feature attributes shall be recorded in the terrain data set:

   1. (1)

      area of coverage;

   2. (2)

      identification of the data originator;

   3. (3)

      data source identifier;

   4. (4)

      acquisition method;

   5. (5)

      post spacing;

   6. (6)

      horizontal reference system;

   7. (7)

      horizontal resolution;

   8. (8)

      horizontal accuracy;

   9. (9)

      horizontal confidence level;

   10. (10)

       horizontal position;

   11. (11)

       elevation;

   12. (12)

       elevation reference;

   13. (13)

       vertical reference system;

   14. (14)

       vertical resolution;

   15. (15)

       vertical accuracy;

   16. (16)

       vertical confidence level;

   17. (17)

       recorded surface;

   18. (18)

       integrity;

   19. (19)

       date and time stamp; and

   20. (20)

       unit of measurement used;

6. (f)

   within the area covered by a 10-km radius from the ARP, terrain data shall comply with the Area 2 numerical requirements;

7. (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;

8. (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

9. (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