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This case is typically for wind parks but may also be applicable for other types of obstacle collections.

Case 1: Series of Points

There may be an operational benefit to collect and represent each wind turbines of a wind park as an individual obstacle.

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Option B: Each individual wind turbine is encoded as its own VerticalStructure. The wind turbines are not related to each other. (see Single Wind Turbine - Use Case).

The example below shows the encoding of Option A:

Code Block
languagexml
titleExample 1: Wind Park with Series of Points
linenumberstrue
collapsetrue
		<!-- GROUPS OF OBSTACLES EACH OBSTACLE PUBLISHED INDIVIDUALLY (Wind turbines of a windpark).
		Case where obstacles of similar height that are located in close proximity to one another as is published as group.
		To indicate that the individual listed obstacles are part of a group, the obstacle type may be published commonly for the obstacle group. -->
		<aixm:VerticalStructure gml:id="uuid.6c7fac45-c24f-4e36-b196-687458d99070 ">
			<gml:identifier codeSpace="urn:uuid:">6c7fac45-c24f-4e36-b196-687458d99070</gml:identifier>
			...
					<aixm:name>WINDPARK BAUMGARTEN</aixm:name>
					<aixm:type>WINDMILL_FARMS</aixm:type>
					<aixm:lighted>NO</aixm:lighted>
					<aixm:markingICAOStandard>OTHER:NOT_MARKED</aixm:markingICAOStandard>
					<aixm:radius xsi:nil="true" nilReason="inapplicable"/>
					<!-- Windturbine 1 of the Windpark-->
					<aixm:part>
						<aixm:VerticalStructurePart gml:id="vsp0003-1">
							<aixm:verticalExtent uom="M">150</aixm:verticalExtent>
							<aixm:verticalExtentAccuracy uom="M">30</aixm:verticalExtentAccuracy>
							<aixm:type>WINDMILL</aixm:type>
							<aixm:designator>OBS-0003-1</aixm:designator>
							<aixm:horizontalProjection_location>
								<aixm:ElevatedPoint srsName="urn:ogc:def:crs:EPSG::4326" gml:id="ep0003-1">
									<gml:pos>47.74500000 -27.52583333</gml:pos>
									<aixm:horizontalAccuracy uom="M">50</aixm:horizontalAccuracy>
									<aixm:elevation uom="M">264</aixm:elevation>
									<aixm:verticalDatum>EGM_96</aixm:verticalDatum>
									<aixm:verticalAccuracy uom="M">30</aixm:verticalAccuracy>
								</aixm:ElevatedPoint>
							</aixm:horizontalProjection_location>
						</aixm:VerticalStructurePart>
					</aixm:part>
					<!-- Windturbine 2 of the Windpark-->
					<aixm:part>
						<aixm:VerticalStructurePart gml:id="vsp0003-2">
							<aixm:verticalExtent uom="M">150</aixm:verticalExtent>
							<aixm:verticalExtentAccuracy uom="M">30</aixm:verticalExtentAccuracy>
							<aixm:type>WINDMILL</aixm:type>
							<aixm:designator>OBS-0003-2</aixm:designator>
							<aixm:horizontalProjection_location>
								<aixm:ElevatedPoint srsName="urn:ogc:def:crs:EPSG::4326" gml:id="ep0003-2">
									<gml:pos>47.74222222 -27.52388889</gml:pos>
									<aixm:horizontalAccuracy uom="M">50</aixm:horizontalAccuracy>
									<aixm:elevation uom="M">253</aixm:elevation>
									<aixm:verticalDatum>EGM_96</aixm:verticalDatum>
									<aixm:verticalAccuracy uom="M">30</aixm:verticalAccuracy>
								</aixm:ElevatedPoint>
							</aixm:horizontalProjection_location>
						</aixm:VerticalStructurePart>
					</aixm:part>
					<!-- Windturbine 3 of the Windpark-->
					<aixm:part>
						<aixm:VerticalStructurePart gml:id="vsp0003-3">
							<aixm:verticalExtent uom="M">150</aixm:verticalExtent>
							<aixm:verticalExtentAccuracy uom="M">30</aixm:verticalExtentAccuracy>
							<aixm:type>WINDMILL</aixm:type>
							<aixm:designator>OBS-0003-3</aixm:designator>
							<aixm:horizontalProjection_location>
								<aixm:ElevatedPoint srsName="urn:ogc:def:crs:EPSG::4326" gml:id="ep0003-3">
									<gml:pos>47.74194444 -27.528888896</gml:pos>
									<aixm:horizontalAccuracy uom="M">50</aixm:horizontalAccuracy>
									<aixm:elevation uom="M">255</aixm:elevation>
									<aixm:verticalDatum>EGM_96</aixm:verticalDatum>
									<aixm:verticalAccuracy uom="M">30</aixm:verticalAccuracy>
								</aixm:ElevatedPoint>
							</aixm:horizontalProjection_location>
						</aixm:VerticalStructurePart>
					</aixm:part>
					<!-- Windturbine 4 of the Windpark-->
					<aixm:part>
						<aixm:VerticalStructurePart gml:id="vsp0003-4">
							<aixm:verticalExtent uom="M">150</aixm:verticalExtent>
							<aixm:verticalExtentAccuracy uom="M">30</aixm:verticalExtentAccuracy>
							<aixm:type>WINDMILL</aixm:type>
							<aixm:designator>OBS-0003-4</aixm:designator>
							<aixm:horizontalProjection_location>
								<aixm:ElevatedPoint srsName="urn:ogc:def:crs:EPSG::4326" gml:id="ep0003-4">
									<gml:pos>47.73888889 -27.52750000</gml:pos>
									<aixm:horizontalAccuracy uom="M">50</aixm:horizontalAccuracy>
									<aixm:elevation uom="M">239</aixm:elevation>
									<aixm:verticalDatum>EGM_96</aixm:verticalDatum>
									<aixm:verticalAccuracy uom="M">30</aixm:verticalAccuracy>
								</aixm:ElevatedPoint>
							</aixm:horizontalProjection_location>
						</aixm:VerticalStructurePart>
					</aixm:part>
					<!-- Windturbine 5 of the Windpark-->
					<aixm:part>
						<aixm:VerticalStructurePart gml:id="vsp0003-5">
							<aixm:verticalExtent uom="M">150</aixm:verticalExtent>
							<aixm:verticalExtentAccuracy uom="M">30</aixm:verticalExtentAccuracy>
							<aixm:type>WINDMILL</aixm:type>
							<aixm:designator>OBS-00003-5</aixm:designator>
							<aixm:horizontalProjection_location>
								<aixm:ElevatedPoint srsName="urn:ogc:def:crs:EPSG::4326" gml:id="ep0003-5">
									<gml:pos>47.73888889 -27.43361111</gml:pos>
									<aixm:horizontalAccuracy uom="M">50</aixm:horizontalAccuracy>
									<aixm:elevation uom="M">269</aixm:elevation>
									<aixm:verticalDatum>EGM_96</aixm:verticalDatum>
									<aixm:verticalAccuracy uom="M">30</aixm:verticalAccuracy>
								</aixm:ElevatedPoint>
							</aixm:horizontalProjection_location>
						</aixm:VerticalStructurePart>
					</aixm:part>
				</aixm:VerticalStructureTimeSlice>
			</aixm:timeSlice>
		</aixm:VerticalStructure>

Case 2: Polygon

Case where a large number of obstacles with similar elevation are grouped, an area encompassing the grouped obstacles may be published instead of publishing each individual object.

...

Code Block
languagexml
titleExample 2: Wind Park as Polygon
linenumberstrue
collapsetrue
		<!-- GROUPS OF OBSTACLES GROUPED WITH AN AREA (POLYGON) (Windfarm area).
			Case where a large number of obstacles with similar elevation are grouped, an area encompassing the grouped obstacles may be published instead of publishing each individual object.-->
		<aixm:VerticalStructure gml:id="uuid.47db48e9-d46a-4100-a266-25a3968b6a98">
			<gml:identifier codeSpace="urn:uuid:">47db48e9-d46a-4100-a266-25a3968b6a98</gml:identifier>
			...
					<aixm:name>RODSAND II</aixm:name>
					<aixm:type>WINDMILL_FARMS</aixm:type>
					<aixm:lighted>YES</aixm:lighted>
					<aixm:markingICAOStandard>NO</aixm:markingICAOStandard>
					<!-- aixm:group is not required by PANS-AIM. 
					However, in AIXM it is coded with 'YES' in case a single part obstacle is actually a group of several obstacles. -->
					<aixm:group>YES</aixm:group>
					<aixm:radius xsi:nil="true" nilReason="inapplicable"/>
					<aixm:part>
						<aixm:VerticalStructurePart gml:id="vsp0002-1">
							<aixm:verticalExtent uom="M">115</aixm:verticalExtent>
							<aixm:verticalExtentAccuracy uom="M">30</aixm:verticalExtentAccuracy>
							<aixm:type>WINDMILL_FARMS</aixm:type>
							<aixm:markingFirstColour>GREEN</aixm:markingFirstColour>
							<aixm:designator>OBS-0002</aixm:designator>
							<aixm:horizontalProjection_surfaceExtent>
								<aixm:ElevatedSurface srsName="urn:ogc:def:crs:EPSG::4326" gml:id="ep0002-1">
									<gml:patches>
										<gml:PolygonPatch>
											<gml:exterior>
												<gml:Ring>
													<gml:curveMember>
														<gml:Curve gml:id="c1234">
															<gml:segments>
																<gml:GeodesicString>
																	<gml:posList>54.58333333 -24.48555556 
																		54.56222222 -24.61694444 
																		54.52638889 -24.61694444 
																		54.57111111 -24.45777778 
																		54.58333333 -24.48555556</gml:posList>
																</gml:GeodesicString>
															</gml:segments>
														</gml:Curve>
													</gml:curveMember>
												</gml:Ring>
											</gml:exterior>
										</gml:PolygonPatch>
									</gml:patches>
									<aixm:horizontalAccuracy uom="M">50</aixm:horizontalAccuracy>
									<aixm:elevation uom="M">115</aixm:elevation>
									<aixm:verticalDatum>EGM_96</aixm:verticalDatum>
									<aixm:verticalAccuracy uom="M">30</aixm:verticalAccuracy>
								</aixm:ElevatedSurface>
							</aixm:horizontalProjection_surfaceExtent>
							<aixm:lighting>
								<aixm:LightElement gml:id="le0002-1">
									<aixm:colour>RED</aixm:colour>
									<aixm:intensityLevel>LIM</aixm:intensityLevel>
									<aixm:type>OTHER:FLASHING</aixm:type>
								</aixm:LightElement>
							</aixm:lighting>
						</aixm:VerticalStructurePart>
					</aixm:part>
					<!-- The number of obstacles forming the group is coded as annotation. -->
					<aixm:annotation>
						<aixm:Note gml:id="n12-12">
							<aixm:propertyName>group</aixm:propertyName>
							<aixm:translatedNote>
								<aixm:LinguisticNote gml:id="ln12-12">
									<aixm:note lang="eng">8 Wind Turbines</aixm:note>
								</aixm:LinguisticNote>
							</aixm:translatedNote>
						</aixm:Note>
					</aixm:annotation>
				</aixm:VerticalStructureTimeSlice>
			</aixm:timeSlice>
		</aixm:VerticalStructure>
	</message:hasMember>

Case 3: Line

Another case is the collection of wind turbines as a line. For example, wind turbines positioned over a mountain ridge or offshore may be collected as a line as in the figure below (red line).

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