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Coding guidelines

Some specific obstacles, such as an ILS glide path antenna, may be located in the close vicinity of a runway due to operational needs, on condition that they have the lowest possible physical strength. 

A dedicated attribute (VerticalStructurePart.frangible) allows coding the information that the obstacle is 'frangible', which is an operationally significant data element. 

Coding example

Navaid as Obstacle (frangible)

Example 3: Glidepath 
<!-- NAVAID OBSTACLE. Area 2a RWY 09L/27R and Area 3 (Glidepath) -->
	<message:hasMember>
		<aixm:VerticalStructure gml:id="uuid.c9bc6ea4-2b5e-4a71-af8a-eec2e4ff3dc3">
			<gml:identifier codeSpace="urn:uuid:">c9bc6ea4-2b5e-4a71-af8a-eec2e4ff3dc3</gml:identifier>
			...
					<aixm:name>OBS-EADD-1005 (GP 27R)</aixm:name>
					<aixm:type>NAVAID</aixm:type>
					...
					<aixm:part>
						<aixm:VerticalStructurePart gml:id="vsp00013-1">
							<aixm:verticalExtent uom="M">5.0</aixm:verticalExtent>
							<aixm:verticalExtentAccuracy uom="M">0.5</aixm:verticalExtentAccuracy>
							<aixm:type>NAVAID</aixm:type>
							<aixm:frangible>YES</aixm:frangible>
							<aixm:horizontalProjection_location>
								<aixm:ElevatedPoint srsName="urn:ogc:def:crs:EPSG::4326" gml:id="ep00013-1">
									<gml:pos>52.378444 -31.926778</gml:pos>
									<aixm:horizontalAccuracy uom="M">0.5</aixm:horizontalAccuracy>
									<aixm:elevation uom="M">35.0</aixm:elevation>
									<aixm:verticalDatum>EGM_96</aixm:verticalDatum>
									<aixm:verticalAccuracy uom="M">0.5</aixm:verticalAccuracy>
								</aixm:ElevatedPoint>
							</aixm:horizontalProjection_location>
							<aixm:lighting>
								<aixm:LightElement gml:id="le00013-1">
									<aixm:colour>RED</aixm:colour>
								</aixm:LightElement>
							</aixm:lighting>
						</aixm:VerticalStructurePart>
					</aixm:part>
					<aixm:hostedNavaidEquipment xlink:href="urn:uuid:4c46c5be-b033-4673-ac70-48a5d72793d2" xlink:title="Glidepath 27R"/>
				</aixm:VerticalStructureTimeSlice>
			</aixm:timeSlice>
		</aixm:VerticalStructure>



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