AIS.TR.355 Terrain data sets

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 er;

(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 and/or regulations, terrain data shall comply with the Area-1 numerical requirements. Terrain data collection surfaces – Area 1 and Area 2 [Figure or form omitted from this preview — available in the Avioverse workspace library.]