Definition
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The following diagram identifies the information items that are usually provided by a data originator for this kind of event.
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The table below provides more details about each information item contained in the diagram. It also provides the mapping of each information item within the AIXM 5.1 structure. The name of the variable (first column) is recommended for use as label of the data field in human-machine interfaces (HMI).
Data item | value | AIXM mapping |
|---|---|---|
group | An indication whether the obstacle consists of a number of closely situated similar objects, for which a simple lat/long position (and eventually radius) is provided. | VerticalStructure.group with this list of values CodeYesNoType |
mobile | An indication whether the obstacle is expected to move around its nominal location | VerticalStructure/VerticalStructurePart.mobile with this list of values CodeYesNoType |
obstacle type | A type of vertical structure | VerticalStructure.type and VerticalStructure/VerticalStructurePart.type with this list of values CodeVerticalStructureType |
description | A textual description of the obstacle, such as the number of similar items for a group, etc. | VerticalStructure.annotation with propertyName="type" and purpose="DESCRIPTION" |
airport | Information such as designator or name used to identify the airport where the obstacle is located | VerticalStructure.annotation with purpose="WARNING" |
location | A named geographical location where or close to which the obstacle is located (especially for Area 1 obstacles) | |
identifier | An alphanumerical designator by which the obstacle is identified in the national obstacle database | VerticalStructure/VerticalStructurePart.designator |
start time | The effective date & time when the obstacle starts to exist. This might be further detailed in a "schedule". | VerticalStructure/VerticalStructureTimeSlice.featureLifetime/beginPosition, VerticalStructure/VerticalStructureTimeSlice/validTime/timePosition, Event/EventTimeSlice.validTime/timePosition and Event/EventTimeSlice.featureLifetime/beginPosition |
end time | The end date & time when the obstacle ceases to exist | VerticalStructure/VerticalStructureTimeSlice.featureLifetime/endPosition and Event/EventTimeSlice.featureLifetime/endPosition also applying the rules for {{Events with estimated end time}} |
schedule | A schedule might be provided, in case the obstacle is only active according to a regular timetable, within the period between the start of life and the end of life. | VerticalStructure/VerticalStructurePart/Timesheet/...according to the rules for {{Schedules}} |
point | The latitude, longitude and horizontal reference datum associated with the obstacle position. | VerticalStructure/VerticalStructurePart/ElevatedPoint according to the rules for encoding for encoding {{Geometrical and geographical data}} |
line | Pairs of latitude/longitude values along a line, including the horizontal reference datum associated with the obstacle extent and location | VerticalStructure/VerticalStructurePart/ElevatedCurveaccording to the rules for encoding for encoding {{Geometrical and geographical data}} |
polygon | Pairs of latitude/longitude values defining a polygon, including the horizontal reference datum associated with the obstacle extent and location | VerticalStructure/VerticalStructurePart/ElevatedSurfaceaccording to the rules for encoding for encoding {{Geometrical and geographical data}} |
circle | A type of polygon in which all the points are located at constant geodesic distance from the centre of the circle. | VerticalStructure/VerticalStructurePart/ElevatedSurfaceaccording to the rules for encoding for encoding {{Geometrical and geographical data}} |
elevation | The elevation (distance from Mean See Level) at the top of the obstacle. | VerticalStructure/VerticalStructurePart/ElevatedPoint or ElevatedSurface or ElevatedCurve/elevation including its unit of measure |
height | The distance between the uppermost and the lowermost parts of the obstacle. | VerticalStructure/VerticalStructurePart.verticalExtent |
relative position | A free text description of the obstacle position in relation to relevant airport elements, such as a runway threshold or the control tower. | VerticalStructure/VerticalStructurePart.annotation with propertyName="horizontalProjection_location" and purpose="REMARK" |
lighting | An indication if the obstacle is lighted. | VerticalStructure.lightedwith the following list of valuesCodeYesNoType |
marking description | Further details of the obstacle lighting, such as times when lighting is available, compliance with the ICAO standards, etc. Also includes the description of visual markers (other than lights) that are installed on the obstacle, such as painting, flags, signs, etc. | VerticalStructure.annotation with propertyName="markingICAOStandard" and purpose="DESCRIPTION" |
note | A free text note that provides further details about the obstacle, such as the reason for which it exists, reduced hight at certain times, etc. | VerticalStructure.annotation with purpose=”REMARK” |
Notes:
It is recommended that data input applications allow the operator to visualise graphically the position and extent of the obstacle, overlaid on an airport map or on an FIR map, as appropriate. If a schedule is used, the graphical interface should also have a "time slider" that allows the operator to see when the obstacle is actually effective.
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It is expected that the data users will evaluate themselves the impact of the position (point, line, polygon) of the new obstacle in relation to the obstacle limitation surfaces of the airports situated in the vicinity of the new obstacle, using the position of the obstacle; the indication "located at airport XXXX" provided by the data originator shall be considered just as a hint and it is therefore encoded just as a text Note with purpose "WARNING".
Identifier | Data encoding rule |
|---|---|
ER-01 | The new obstacle shall be encoded as:
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ER-02 | If the obstacle consists of a group of similar obstacles situated close to each other for which the individual positions/extents cannot be provided, then the "group" property of the VerticalStructure shall get the value "YES". The position of the group can be provided either as a point or as a surface (polygon or circle), if the information about the extent of the group is known. |
ER-03 | If the obstacle can change position or has mobile parts (such as a crane arm), then the overall area in which the obstacle or any part of it can be located shall be provided as a surface (polygonal) extent and the "mobile" property of the VerticalStructure shall get the value "YES". |
ER-04 | The type of the obstacle shall be encoded (same value) both in the VerticalStructure.type and in the VerticalStructurePart.type |