IGS International GNSS Service

ILRS International Laser Ranging Service

IPCC Intergovernmental Panel on Climate Change

ITRF International Terrestrial Reference Frame

IVS International VLBI Service

JERS-1 Japanese Earth Resources Satellite

JPL Jet Propulsion Laboratory

kHz kiloHertz

LBS Location-Based Services

LEO Low-Earth Orbiting

LiDAR Light Detection and Ranging

LLR Lunar Laser Ranging

LoD Length of Day

MHHW Mean Higher High Water

MHW Mean High Water

MIT Massachusetts Institute of Technology

NAD27 North American Datum of 1927

NAD83 North American Datum of 1983

NAREF North American Reference Frame

NASA National Aeronautics and Space Administration

NAVD88 North American Vertical Datum of 1988

NCALM National Center for Airborne Laser Mapping

NGA National Geospatial-Intelligence Agency

NGS National Geodetic Survey

NIST National Institute of Standards and Technology

NOAA National Oceanic and Atmospheric Administration

NRC National Research Council

NSDI National Spatial Data Infrastructure

NSF National Science Foundation

NSRS National Spatial Reference System

OGCMs Ocean General Circulation Models

PANGA Pacific Northwest Geodetic Array

PBO Plate Boundary Observatory

PGR Postglacial Rebound

PO.DAAC Physical Oceanography Distributed Active Archive Center

PSMSL Permanent Service for Mean Sea Level

PNT Positioning, Navigation, and Timing

POD Precise Orbit Determination

PWV Perceptible Water Vapor

SLR Satellite Laser Ranging

SMAP Soil Moisture Active and Passive Satellite

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