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numerical requirements
10.2.1 To satisfy requirements necessary to accommodate
air navigation systems or functions specified in 10.1, sets of
electronic terrain and obstacle data shall be collected and
recorded in databases in accordance with the following
coverage areas:
.- Area I: entire tenitory of a State;
Note.- See Appendix 8 for graphical illustrations of the
defined coverage areas.
10.2.2 Area 1 shall cover the entire tenitory of a State,
including aerodromedheliports. Area 2 shall be the terminal
control area as published in a State's aeronautical information
publication (AIP) or limited to a 45-Ian radius from the aerodromeheliport
reference point (whichever is smaller). At IFK
aerodromes/heliports where a terminal control area has not
been established, Area 2 shall be the area within a 45-Ian
radius of the aerodromeheliport reference point.
10.2.3 At IFR aerodromesheliports, Area 3 shall cover
the area that extends from the edge(s) of the runway(s) to 90 m
ftom the runway centre line@) and for all other parts of aerodromeheliport
movement area(s), 50 m from the edge(s) of
the defined area(s).
10.2.4 Area 4 shall be restricted to those runways where
precision approach Category I1 or 111 operations have been
established and where detailed terrain information is required
by operators to enable them to assess, by use of radio
altimeters, the effect of terrain on decision height determination.
The width of the area shall be 60 m on either side
of the extended runway centre line while the length shall be
900 m fiom the runway threshold measured along the
extended runway centre line.
10.2.5 According to the air navigation applications listed in
10.1 and areas of coverage, sets of electronic terrain data shall
satisfy the numerical requirements specified in Appendix 8,
Table A8-1 while obstacle data shall satisfy the numerical
requirements specified in Appendix 8, Table A8-2.
Note 1. - Numerical terrain and obstacle data requirements
for Area 2 provided in Appendix 8, Table A8-I and Table A8-2,
respectively, are iief;ned on the basis of the most stringent
application requirement (application listedunder 10.1 b)).
Note 2.- It is recognized that some applications listed in
10.1 could be adequately accommodated with terrain and
obstacle data sets that are of lower requirements than those
specified in Appendix 8, Table A8-1 and Table A8-2, respectively.
Consequently, careful evaluation of available data sets
by data users is necessary in order to determine fthe products
are fit for their intended use.
- Area 2: terminal control area;
10.3 Terrain database - content and structure
- Area 3: aerodromeheliport area; and
- Area 4: Category I1 or I11 operations area.
ANNEX 15
10.3.1 A terrain database shall contain digital sets of data
representing terrain surface in the form of continuous elevation
Annex IS -A eronautical ~nformationS ervices Chapter 10
values at all intersections (points) of a defined grid, referenced
to common datum. A terrain grid shall be angular or linear and
shall be of regular or irregular shape.
Note.- In regions of higher latitudes, latitude grid spacing
may be adjusted to maintain a constant linear density of
measurement points.
10.3.2 Sets of electronic terrain data shall include spatial
(position and elevation), thematic and temporal aspects for the
surface of the Earth containing naturally occurring features
such as mountains; hills, ridges, valleys, bodies of water, permanent
ice and snow, and excluding obstacles. In practical
terms, depending on the acquisition method used, this shall
represent the continuous surface that exists at the bare Earth,
the top of the canopy or something in-between,'also known as
"first reflective surface".
10.3.3 Terrain data shall be collected according to the
areas specified in 10.2, terrain data collection surfaces and criteria
specified in Appendix 8, Figure A8-1, and in accordance
with the terrain data numerical requirements provided in
Table A8-1 of Appendix 8. In terrain databases, only one feature
type, i.e. terrain, shall be recorded. Feature attributes
describing terrain shall be those listed in Appendix 8,
Table A8-3. The terrain feature amibutes listed in Table A8-3
represent the minimum set of terrain attributes, and those annotated
as mandatory shall be recorded in the terrain database.
10;4 Obstacle database - content and structure
10.4.1 One obstacle database shall contain a digital set of
obstacle data and shall include those features having vertical
significance in relation to adjacent and surrounding 'features
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