<simpleType name="OffsetTypeEnumType">
  <annotation>
    <documentation>Methods for computing lateral offsets from linear centerlines. Defines the geometric algorithm used to calculate the perpendicular or lateral offset from the linear element centerline.</documentation>
  </annotation>
  <restriction base="string">
    <enumeration value="perpendicular">
      <annotation>
        <documentation>Offset perpendicular to the tangent of the centerline at each point. Standard geometric offset method. At each position along the centerline, the offset is measured perpendicular to the local tangent direction. This is the most common method for straight or gently curved features.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="constantBearing">
      <annotation>
        <documentation>Offset at a constant compass bearing from centerline points. Used in marine surveys with fixed sensor arrays. Rather than perpendicular to the local tangent, offset is measured at a fixed azimuth. Useful when instruments maintain constant orientation relative to north rather than relative to vessel heading.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="radial">
      <annotation>
        <documentation>Offset radially from a center point. May be used for circular or spiral survey patterns. Offset is measured radially outward from a defined center point, rather than perpendicular to the centerline. Applicable for circular grid patterns or radial sampling designs.</documentation>
      </annotation>
    </enumeration>
  </restriction>
</simpleType>