f9e8a9d6-4cec-428a-9cb8-59df19294c59 urn:uuid eng UTF-8 nonGeographicDataset nonGeographicDataset 2025-10-16T16:47:17 creation ISO 19115 2016 Geophysical Data Collection - elevation f9e8a9d6-4cec-428a-9cb8-59df19294c59 Digital Elevation Model data record the terrain height variations from the processed point-located data recorded on an airborne geophysical survey. The aircraft altimeter data records the height of the aircraft above the ground and the aircraft GPS records the height of the aircraft above the ellipsoid. Subtracting the two values enables the height of the terrain beneath the aircraft relative to the ellipsoid to be calculated. This ellipsoidal terrain height is corrected for the variation between the ellipsoid and the geoid (the n-value correction) to produce terrain heights relative to sea level. {"type": "Polygon", "coordinates": [[[90.0, -55.0], [175.0, -55.0], [175.0, -9.0], [90.0, -9.0], [90.0, -55.0]]]} 90.0 175.0 -55.0 -9.0 AU-EEZ Airborne Digital Data DC2020 Digital Elevation Model Geophysical Data Collection Geophysics NCI Published_External geophysics Related Product documentDigital Geophysical Archive Data Delivery System HTML Unnamed resource documentDigital HTML