... a type of
AIRSPACE_VERTEX
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A geographical position on the centreline of an airspace that has the shape of a corridor.
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Notes:
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The centreline must be an open shape. This does not restrict describing closed corridors, for which the position of the first and the last point are identical. Just from a formal point of view, the last point must have CODE_TYPE='END'.
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Attributes
... see as well the attributes of the super-type entity
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CODE_TYPE
[Type]
mandatory
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The type of the path between the current vertex and the next one on the same centreline.
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Notes:
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1) If CODE_TYPE='CCA' or 'CWA', even if VAL_RADIUS_ARC is specified, the position of the centre of the arc shall be used in constructing its shape; the value of the radius shall be considered as an indication only and shall be ignored. For the calculation of the exact position of the arc-centre the following procedure is used: the two ends and the given centre define a plane; the exact centre is considered to be in this plane, as the projection of the declared centre on the line of equal distance from the two ends.
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Rules:
- The vertex with the highest NO_SEQ must have CODE_TYPE = 'END'.
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Domain:
CODE_TYPE_CLINE_VERTEX
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The horizontal shape of an airspace of type 'corridor', described with centreline and width.
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Notes:
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All positions situated at a distance from the centreline, which is smaller than or equal to half of the width of the corridor, are considered as being inside the airspace. This interpretation is similar to the GIS concept of buffer around a feature and creates airspace geometries which use arcs of circle to connect the segments of the airspace edge.
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Rules:
- All related AIRSPACE_CLINE_VERTEX should have the same value in CODE_DATUM..
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Attributes
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VAL_WIDTH
[Width]
mandatory
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The distance between the edges of the corridor along the centreline.
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Notes:
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The distance from the centreline to the edges of the corridor is equal to half of the declared width.
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Domain:
VAL_DIST_HORZ
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UOM_WIDTH
[Unit of measurement [width]]
mandatory
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The unit of measurement for the value expressing the width of the corridor.
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Domain:
UOM_DIST_HORZ
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TXT_RMK
[Remark]
optional
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Domain:
TXT_RMK
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A composition rule, by which the geometry of an airspace is derived from the geometry of other airspace. The derivation process can be either limited to the horizontal border or extended to a total aggregation of airspace volumes.
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Attributes
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TXT_RMK
[Remark]
optional
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Domain:
TXT_RMK
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An entity which describes a geographical position used as vertex in the description of the shape of an airspace.
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Rules:
- If CODE_TYPE = 'CCA' or 'CWA', then GEO_LAT_ARC and GEO_LONG_ARC are mandatory and indicate the centre of the arc.
- If CODE_TYPE = 'ABE', then GEO_LAT_ARC and GEO_LONG_ARC are mandatory and indicate a point situated on the arc edge between the current vertex and the vertex with the following sequence number.
- IF CODE_TYPE = 'FNT', then the relationship 'based on a portion of GEO_BORDER' is mandatory.
- IF CODE_TYPE has any other value than 'FNT', then the relationship 'based on a portion of GEO_BORDER' is not allowed.
- IF CODE_TYPE = 'FNT', then the position given by GEO_LAT and GEO_LONG must be situated, with a tolerance of 30 M, on a segment of the related GEO_BORDER.
- IF CODE_TYPE='FNT', 'GRC' or 'RHL', then GEO_LAT_ARC, GEO_LONG_ARC, VAL_RADIUS_ARC and UOM_RADIUS_ARC cannot be specified.
- IF CODE_TYPE = 'FNT', then the position given by GEO_LAT and GEO_LONG of the next AIRSPACE_VERTEX must be situated, with a tolerance of 30 M, on a segment of the related GEO_BORDER.
- If CODE_TYPE='ABE', then VAL_RADIUS_ARC and UOM_RADIUS_ARC cannot be specified.
- If CODE_TYPE='CWA' or 'CCA', then the distance between the centre of the arc and the two ends (the one specified by the current vertex and the one specified by the next vertex) shall not differ by more than 1% .
- If CODE_TYPE='ABE', 'CWA' or 'CCA', then the (calculated) radius of the arc shall not exceed 500 NM (plausibility value).
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Attributes
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NO_SEQ
[Sequence number]
mandatory
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A number indicating the order of the AIRSPACE VERTEX in the airspace shape description.
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Domain:
NO_SEQ
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GEO_LAT
[Latitude]
mandatory
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The latitude of the vertex.
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Domain:
GEO_LAT
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GEO_LONG
[Longitude]
mandatory
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The longitude of the vertex.
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Domain:
GEO_LONG
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CODE_DATUM
[Datum]
mandatory
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A code indicating the geodetic datum in which the geographical co-ordinates are expressed.
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Rules:
- All geographical coordinates should be expressed in the WGS 84 system.
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Domain:
CODE_DATUM
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VAL_GEO_ACCURACY
[Geographical accuracy]
optional
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The horizontal distance from the stated geographical position within which there is a defined confidence of the true position falling.
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Rules:
- If VAL_GEO_ACCURACY is specified, than UOM_GEO_ACCURACY is mandatory.
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Domain:
VAL_DIST_HORZ
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UOM_GEO_ACCURACY
[Unit of measurement [geographical accuracy]]
optional
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The unit of measurement for the value expressing the accuracy of the geographical co-ordinates.
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Domain:
UOM_DIST_HORZ
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GEO_LAT_ARC
[Latitude for arc]
optional
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The latitude of either: - the centre of the arc or circle (if CODE_TYPE = 'CCA', 'CWA' or 'CIR') or - a point situated on the arc edge between the current vertex and the vertex with the following sequence number (if CODE_TYPE = 'ABE').
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Domain:
GEO_LAT
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GEO_LONG_ARC
[Longitude for arc]
optional
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The longitude of either: - the centre of the arc or circle (if CODE_TYPE = 'CCA', 'CWA' or 'CIR') or - a point situated on the arc edge between the current vertex and the vertex with the following sequence number (if CODE_TYPE = 'ABE').
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Domain:
GEO_LONG
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VAL_RADIUS_ARC
[Radius of arc]
optional
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The value of the arc or circle radius.
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Rules:
- If VAL_RADIUS_ARC is specified, than UOM_RADIUS_ARC is mandatory.
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Domain:
VAL_DIST_HORZ
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UOM_RADIUS_ARC
[Unit of measurement [arc, circle radius]]
optional
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The unit of measurement used for the arc or circle radius.
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Domain:
UOM_DIST_HORZ
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VAL_CRC
[Cyclic redundancy check]
optional
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Hexadecimal value of a 32-bit polynominal cyclic redundancy check (CRC) over the values of a selected set of attributes that model critical, essential and routine data, according to ICAO Annex 15, item 3.2.10.
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Notes:
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Applications implementing the model shall decide and notify the specific attributes which are used for the CRC calculations, taking into consideration the requirements of the ICAO Annex 15.
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Domain:
VAL_HEX
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TXT_RMK
[Remark]
optional
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Domain:
TXT_RMK
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An angular reference from a radio navigation aid. For example, RDL 237 FFM, BRG 040 SIB.
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Attributes
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VAL_ANGLE_BRG
[Bearing indication]
mandatory
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The indication of a bearing (at a given point) by the measurement of the angle between the bearing and either True North or Magnetic North (this should appear explicitly or implicitly). The angle is measured clockwise from 0 degrees up to but not including 360 degrees. The value can also be a VOR radial. For example, Westward is expressed as 270.
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Rules:
- The clockwise measured angle defined by the North, the position of the navaid (VOR, NDB or TACAN) providing the bearing and the SIGNIFICANT POINT or the NAV_SYS_CHECKPOINT to which it refers must be consistent (within 5 degrees) with the value of the VAL_ANGLE_BRG..
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Domain:
VAL_ANGLE_BRG
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TXT_RMK
[Remark]
optional
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Domain:
TXT_RMK
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(ICAO) A defined area, on a land aerodrome/heliport, intended to accommodate aircraft/helicopters for purposes of loading and unloading passengers, mail or cargo, and for fuelling, parking or maintenance.
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Attributes
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TXT_NAME
[Name]
mandatory
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The full textual name or designator used to identify an apron at an aerodrome/heliport which has more than one.
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Domain:
TXT_NAME
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[CODE_COMPOSITION]
DEPRECATED-4.5
[Surface composition]
optional
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The composition of the surface of an apron. For example, asphalt, concrete etc..
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Domain:
CODE_COMPOSITION_SFC
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[CODE_COND_SFC]
DEPRECATED-4.5
[Surface condition]
optional
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A code indicating the condition of the apron surface.
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Domain:
CODE_COND_SFC
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[CODE_STRENGTH]
DEPRECATED-4.5
[Surface strength method]
optional
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A code indicating the method used to measure the surface strength.
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Rules:
- If CODE_STRENGTH has the value 'PCN', then the value of TXT_DESCR_STRENGTH shall conform to the rules for the PCN-ACN method, as specified in ICAO Annex 14, item 2.2.6.
Examples: - '80/R/B/W/T' - '40/ F/ B /0.80 MPa /T' - '50/F/A/Y/U Note: - Composite construction' - '50/F/A/Y/U Note: - The reported PCN is subject to a B747-400 all-up mass limitation of 390 000 kg.' If no method is indicated in the 'Surface strength method' field, then there are no restrictions with regard to the content of this field. For example: 'LCN 72, h= 56'.
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Domain:
[CODE_STRENGTH_SFC]
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[TXT_DESCR_STRENGTH]
DEPRECATED-4.5
[Surface strength]
optional
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A free text description of the surface strength, in character format, according to the value of the CODE_STRENGTH attribute. E.g. 80/R/B/W/T for a PCN type value.
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Domain:
TXT_DESCR
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CODE_STS
[Operational status]
optional
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A code indicating the operational status of an apron. For example, serviceable, unserviceable, closed, work in progress, etc.
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Domain:
CODE_STS_SFC
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TXT_MARKING
[Marking system description]
optional
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A free text description of the marking system on the apron.
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Domain:
TXT_DESCR
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[TXT_LGT]
DEPRECATED-4.5
[Lighting system description]
optional
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A free text description of the lighting system on the apron.
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Domain:
TXT_DESCR
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TXT_RMK
[Remark]
optional
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Domain:
TXT_RMK
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... a type of
SURFACE_LGT_SYS
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The lighting system provided for an apron.
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Attributes
... see as well the attributes of the super-type entity
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CODE_PSN
[Position]
optional
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A code indicating the part of the apron served by the lighting system.
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Domain:
CODE_PSN_APRON
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This entity will indicate which State is de jure and which State is de facto responsible for the airspace.
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Attributes
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CODE_TYPE
[Type]
optional
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A code indicating the type ofresponsibility that the organisation/authority takes for the airspace. For example, the airspace is under the jurisdiction of Organization/Authority, the airspace is delegated to the Organization/Authority for the provision of air traffic services.
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Domain:
CODE_TYPE_AS_AUTH
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TXT_RMK
[Remark]
optional
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Domain:
TXT_RMK
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This entity will identify the particular callsign required to contact the provider of a service and the language used on a particular frequency.
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Attributes
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TXT_CALL_SIGN
[Call sign]
mandatory
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The full textual service provider identification or callsign for a particular frequency. For example, Athinai Control, Malmoe Radar, etc..
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Notes:
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There is some need here to establish the use of a Latin-type alphabet to express any character of any national alphabet in a universally recognizable way. Much of the 'equipment' will not carry the actual characters necessary to 'spell' a textual name or remark in its mother tongue.
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Domain:
TXT_NAME
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CODE_LANG
[Language]
mandatory
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A code indicating the language in which the service is provided on a particular frequency, as associated with a particular call sign.
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Domain:
CODE_LANG
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TXT_RMK
[Remark]
optional
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Domain:
TXT_RMK
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A named geographical location not marked by the site of a radio navigation aid, used in defining an ATS route, the flight path of an aircraft or for other navigation or ATS purposes.
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Notes:
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The word 'intersection' as published by the AIP is incorporated in the attribute name only. For example, GOTAN INTERSECTION will have a CODE_ID of GOTAN and the TXT_NAME of GOTAN INTERSECTION.
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Rules:
- If CODE_TYPE = 'ICAO' or 'OTHER', then there should not exist any other designated point with CODE_TYPE = 'ICAO', 'COORD' or 'OTHER' located within 1 NM..
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Attributes
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CODE_ID
[Identification]
mandatory
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The coded identification of the designated point. For example, the five-letter ICAO name of the point, etc..
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Rules:
- If CODE_TYPE='ICAO', then CODE_ID should be unique world-wide.
- If CODE_TYPE='ADHP', then CODE_ID should be unique in the context of the related AD_HP.
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Domain:
CODE_ID_DESIG_PT
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GEO_LAT
[Latitude]
mandatory
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The latitude of the position of the designated point.
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Domain:
GEO_LAT
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GEO_LONG
[Longitude]
mandatory
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The longitude of the position of the designated point.
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Domain:
GEO_LONG
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CODE_DATUM
[Datum]
mandatory
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A code indicating the geodetic datum in which the geographical co-ordinates are expressed.
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Rules:
- All geographical coordinates should be expressed in the WGS 84 system.
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Domain:
CODE_DATUM
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VAL_GEO_ACCURACY
[Geographical accuracy]
optional
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The horizontal distance from the stated geographical position within which there is a defined confidence of the true position falling.
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Rules:
- If VAL_GEO_ACCURACY is specified, then UOM_GEO_ACCURACY is mandatory.
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Domain:
VAL_DIST_HORZ
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UOM_GEO_ACCURACY
[Unit of measurement [geographical accuracy]]
optional
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The unit of measurement for the value expressing the accuracy of the geographical co-ordinates.
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Domain:
UOM_DIST_HORZ
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VAL_CRC
[Cyclic redundancy check]
optional
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Hexadecimal value of a 32-bit polynominal cyclic redundancy check (CRC) over the values of a selected set of attributes that model critical, essential and routine data, according to ICAO Annex 15, item 3.2.10.
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Notes:
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Applications implementing the model shall decide and notify the specific attributes which are used for the CRC calculations, taking into consideration the requirements of the ICAO Annex 15.
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Domain:
VAL_HEX
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CODE_TYPE
[Type]
mandatory
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The specific type of designated point whether published by the State, published by the ICAO or created by another agency for convenience of identification etc.
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Rules:
- If CODE_TYPE='ADHP', then one of the following relationships is mandatory:
· DESIGNATED_POINT associated with AD_HP · DESIGNATED_POINT at the centre of TLOF · DESIGNATED_POINT located at RWY_CLINE_POINT · DESIGNATED_POINT located at FATO_CLINE_POINT · DESIGNATED_POINT the reference point of AD_HP.
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Domain:
CODE_TYPE_DESIG_PT
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TXT_NAME
[Name]
optional
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The full textual name of a designated point, if any. For example, 'GOTAN Intersection' for GOTAN.
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Domain:
TXT_NAME
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TXT_RMK
[Remark]
optional
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Domain:
TXT_RMK
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