Geodesy

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8 domain-specific abstractions whose origin domain is Geodesy.

• Dynamic height — A geopotential-based vertical coordinate equal to a point's geopotential number divided by a fixed reference gravity, making equal values follow the same level surface and supporting large-scale water-flow applications.
• Earth Gravitational Model — A standardized global geopotential model representing Earth's gravity field with spherical-harmonic coefficients and associated geoid heights for geodesy and navigation.
• Earth-centered, Earth-fixed coordinate system — A rotating geocentric Cartesian reference frame fixed to Earth for expressing terrestrial and near-Earth positions.
• Helmert transformation — A similarity transformation between three-dimensional geodetic coordinate frames using translations, rotations, and scale.
• Least-Squares Adjustment — Reconcile redundant measurements with parametric, conditional, or combined observation equations by minimizing covariance-weighted corrections, returning model-consistent adjusted estimates and conditional uncertainty.
• Local tangent plane coordinates — A location-dependent Cartesian frame tangent to an Earth reference ellipsoid, commonly oriented east–north–up or north–east–down.
• Networked Transport of RTCM via Internet Protocol — Stream identified GNSS correction or observation data from source servers through Internet-connected casters to authenticated clients using a standardized request-and-mountpoint protocol.
• Satellite gravimetry — Measurement of Earth's static and time-varying gravity field from satellite orbits, inter-satellite ranging or onboard accelerometry to infer mass distribution and redistribution.