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/usr/share/sdformat/1.5/spherical_coordinates.sdf is in sdformat-sdf 2.0.0-6.

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<element name="spherical_coordinates" required="0">
  <element name="surface_model" type="string" default="EARTH_WGS84" required="1">
    <description>
      Name of planetary surface model, used to determine the surface altitude
      at a given latitude and longitude. The default is an ellipsoid model of
      the earth based on the WGS-84 standard. It is used in Gazebo's GPS sensor
      implementation.
    </description>
  </element>

  <element name="latitude_deg" type="double" default="0.0" required="1">
    <description>
      Geodetic latitude at origin of gazebo reference frame, specified
      in units of degrees.
    </description>
  </element>

  <element name="longitude_deg" type="double" default="0.0" required="1">
    <description>
      Longitude at origin of gazebo reference frame, specified in units
      of degrees.
    </description>
  </element>

  <element name="elevation" type="double" default="0.0" required="1">
    <description>
      Elevation of origin of gazebo reference frame, specified in meters.
    </description>
  </element>

  <element name="heading_deg" type="double" default="0.0" required="1">
    <description>
      Heading offset of gazebo reference frame, measured as angle between
      East and gazebo x axis, or equivalently, the angle between North and
      gazebo y axis. The angle is specified in degrees.
    </description>
  </element>

</element>