Monument

{
  "id": "MLC-T-OAG-004384",
  "term": "Monument",
  "field": "Oil and gas",
  "definition": "A permanent, precisely surveyed marker installed at a fixed location within a seismic survey area, used as a reference point for positioning. Monuments serve as control points for verifying the coordinates of seismic sources and receivers, particularly for time-lapse (4D) surveys where repeatable positioning is required. These markers are often concrete pillars or metal rods anchored in the ground, with coordinates determined by high-precision Global Positioning System (GPS) measurements.",
  "subject": "Geophysics",
  "url": "https://mlchart.com/terminology/oil-and-gas/monument/"
}