Obstacle

Table of Contents

Ogr Obstacle group
Obs Obstacle
Obs Obstacle via ObsUidLink
Rdo Runway direction obstacle ⍈
Fdo FATO direction obstacle ⍈

Ogr Obstacle Group

An Ogr obstacle group builds clusters of individual Obs obstacles. To guarantee uniqueness, the coordinates of the first Obs obstacle within this group are used as the group reference point.

<Ogr source="EG|ENR|5.4|2018-01-04|2947">
  <OgrUid region="EG">
    <txtName>DROITWICH LONGWAVE ANTENNA</txtName>
    <geoLat>52.29639600N</geoLat>
    <geoLong>002.10675400W</geoLong>
  </OgrUid>
  <codeDatum>WGE</codeDatum>
  <valGeoAccuracy>5</valGeoAccuracy>
  <uomGeoAccuracy>M</uomGeoAccuracy>
  <valElevAccuracy>0</valElevAccuracy>
  <uomElevAccuracy>FT</uomElevAccuracy>
  <txtRmk>Longwave antenna see https://en.wikipedia.org/wiki/Droitwich_Transmitting_Station</txtRmk>
</Ogr>

• Ogr – Obstacle group
  • @source – Reference to source of data
• OgrUid – Ogr identifier
  • @region – Region this obstacle group is located in
  • txtName – Name of the obstacle group
  • geoLat – Group reference point latitude (by convention equal to the location latitude of the first Obs obstacle of this group)
  • geoLong – Group reference point longitude (by convention equal to the location longitude of the first Obs obstacle of this group)
• codeDatum – Always WGE (WGS-84)
• valGeoAccuracy – Latitude/longitude margin of error
• uomGeoAccuracy – Unit of valGeoAccuracy: FT (feet), KM (kilometers), M (meters) or NM (nautical miles)
• valElevAccuracy – Elevation margin of error
• uomElevAccuracy – Unit of valElevAccuracy: FT (feet) or M (meters)
• txtRmk – Remarks

Obs Obstacle

An Obs obstacle is an individual object described as cylindrical volume with circular base (geoLat, geoLong and optional valRadius) and height (valElev and optional valHgt).

Obstacles must be member of an Ogr obstacle group, even if the group consists of just this single obstacle alone. Don't confuse obstacle groups (logical grouping) and obstacles linked with ObsUidLink and codeLinkType (physical and therefore potentially dangerous connection).

<Obs>
  <ObsUid>
    <OgrUid region="EG">
      <txtName>DROITWICH LONGWAVE ANTENNA</txtName>
      <geoLat>52.29639600N</geoLat>
      <geoLong>002.10675400W</geoLong>
    </OgrUid>
    <geoLat>52.29639600N</geoLat>
    <geoLong>002.10675400W</geoLong>
  </ObsUid>
  <txtName>DROITWICH LW NORTH</txtName>
  <codeType>ANTENNA</codeType>
  <codeGroup>Y</codeGroup>
  <codeLgt>Y</codeLgt>
  <codeMarking>Y</codeMarking>
  <txtDescrLgt>Red lighting</txtDescrLgt>
  <txtDescrMarking>Red/white horizontal stripes</txtDescrMarking>
  <codeDatum>WGE</codeDatum>
  <valElev>897</valElev>
  <valHgt>700</valHgt>
  <uomDistVer>FT</uomDistVer>
  <codeHgtAccuracy>Y</codeHgtAccuracy>
  <valRadius>200</valRadius>
  <uomRadius>M</uomRadius>
  <datetimeValidWef>2018-08-01T00:00:00Z</datetimeValidWef>
  <datetimeValidTil>2020-07-31T24:00:00Z</datetimeValidTil>
  <txtRmk>Connected to transmitter hall</txtRmk>
</Obs>

<Obs>
  <ObsUid>
    <OgrUid region="EG">
      <txtName>DROITWICH LONGWAVE ANTENNA</txtName>
      <geoLat>52.29639600N</geoLat>
      <geoLong>002.10675400W</geoLong>
    </OgrUid>
    <geoLat>52.29457700N</geoLat>
    <geoLong>002.10568600W</geoLong>
  </ObsUid>
  <txtName>DROITWICH LW SOUTH</txtName>
  <codeType>ANTENNA</codeType>
  <codeGroup>Y</codeGroup>
  <codeLgt>Y</codeLgt>
  <codeMarking>Y</codeMarking>
  <txtDescrLgt>Red lighting</txtDescrLgt>
  <txtDescrMarking>Red/white horizontal stripes</txtDescrMarking>
  <codeDatum>WGE</codeDatum>
  <valElev>907</valElev>
  <valHgt>700</valHgt>
  <uomDistVer>FT</uomDistVer>
  <codeHgtAccuracy>Y</codeHgtAccuracy>
  <valRadius>200</valRadius>
  <uomRadius>M</uomRadius>
  <ObsUidLink>
    <OgrUid region="EG">
      <txtName>DROITWICH LONGWAVE ANTENNA</txtName>
      <geoLat>52.29639600N</geoLat>
      <geoLong>002.10675400W</geoLong>
    </OgrUid>
    <geoLat>52.29639600N</geoLat>
    <geoLong>002.10675400W</geoLong>
  </ObsUidLink>
  <codeLinkType>CABLE</codeLinkType>
  <datetimeValidWef>2018-08-01T00:00:00Z</datetimeValidWef>
  <datetimeValidTil>2020-07-31T24:00:00Z</datetimeValidTil>
  <txtRmk>Not connected to transmitter hall</txtRmk>
</Obs>

• Obs – Obstacle
• ObsUid – Obs identifier
  • OgrUid – Association to Ogr obstacle group
  • geoLat – Location latitude
  • geoLong – Location longitude
• txtName – Name of the obstacle
• codeType – ANTENNA, BUILDING, CHIMNEY, CRANE, MAST, TOWER, TREE, WINDTURBINE or OTHER (see remarks)
• codeGroup – Y (yes, obstacle group contains this and other members) or N (no, obstacle group contains this member only)
• codeLgt – Y (yes, obstacle is lighted), N (no, obstacle is not lighted) or omit the tag if unknown
• codeMarking – Y (yes, obstacle has markings), N (no, obstacle has no markings) or omit the tag if unknown
• txtDescrLgt – Description of the lighting (e.g. color)
• txtDescrMarking – Description of the visual markings
• codeDatum – Always WGE (WGS-84)
• valElev – Elevation measured at the top of the obstacle
• valHgt – Height measured from ground to the top of the obstacle
• uomDistVer – Unit of valElev and valHgt: FT (feet) or M (meters)
• codeHgtAccuracy – Y (yes, height is exact) or N (no, height is estimated)
• valRadius – Radius around the obstacle location which completely covers the obstacle in any possible orientation
• uomRadius – Unit of valRadius: FT (feet), KM (kilometers), M (meters) or NM (nautical miles)
• ObsUidLink – ObsUid of another Obs this obstacle is physically linked with
• codeLinkType – Type of link between the two obstacles: CABLE (e.g. power line or cableway), SOLID (e.g. concrete or wood) or OTHER (see remarks)
• datetimeValidWef – Obstacle effective after this datetime
• datetimeValidTil – Obstacle effective until this datetime
• txtRmk – Remarks

Examples