<simpleType name="LocationMethodEnumType">
  <restriction base="string">
    <enumeration value="surveyed">
      <annotation>
        <documentation>Location determined by direct survey measurements using established surveying methods.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="gnss">
      <annotation>
        <documentation>Location determined using a Global Navigation Satellite System without differential correction.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="gnssDifferential">
      <annotation>
        <documentation>Location determined using GNSS with differential correction (e.g., DGPS, RTK, PPP)</documentation>
      </annotation>
    </enumeration>
    <enumeration value="digitized">
      <annotation>
        <documentation>Location determined by digitizing from a map, image, or other spatial representation.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="interpreted">
      <annotation>
        <documentation>Location inferred or interpreted from descriptive, geological, or contextual information rather than direct measurement.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="estimated">
      <annotation>
        <documentation>Location approximated based on limited information where the precise position is unknown.</documentation>
      </annotation>
    </enumeration>
    <enumeration value="reported">
      <annotation>
        <documentation>Location reported by an external source without independent verification.</documentation>
      </annotation>
    </enumeration>
  </restriction>
</simpleType>