Location determined by direct survey measurements using
established surveying methods.

Location determined using a Global Navigation Satellite System
without differential correction.

Location determined using GNSS with differential correction
(e.g., DGPS, RTK, PPP)

Location determined by digitizing from a map, image, or other
spatial representation.

Location inferred or interpreted from descriptive, geological,
or contextual information rather than direct measurement.

Location approximated based on limited information where the
precise position is unknown.

Location reported by an external source without independent
verification.