AMI

Active Microwave Instrument

AMI-WS

Active Microwave Instrument Wide Swath

AMSR-E

Advanced Microwave Scanning Radiometer-Earth Observing System

AMSR2

Advanced Microwave Scanning Radiometer 2

AMSU

Advanced Microwave Sounding Unit

ASAR

Advanced Synthetic Aperture Radar

ASCAT

Advanced Scatterometer (Metop)

ATBD

Algorithm Theoretical Baseline Document

CAS

Chinese Academy of Sciences

CCI

Climate Change Initiative

CDF

Cumulative Distribution Function

CDR

Climate Data Record

CDS

Climate Data Store

CEOP

Coordinated Energy and Water Cycle Observations Project

CMORPH

Morphing Method of the Climate Prediction Centre

CPC

Climate Prediction Centre

C3S

Copernicus Climate Change Service

DARD

Data Access Requirement Document

DGG

Discrete Global Grid

DMSP

Defense Meteorological Satellite Program

DTED

Digital Terrain Elevation Model

EASE

Equal-Area Scalable Earth

ECV

Essential Climate Variable

ENVISAT

Environmental Satellite

EO

Earth Observation

ERA-Interim

ECMWF ReAnalysis Interim

ERA-40

ECMWF ReAnalysis 40

ERA5-Land

ECMWF ReAnalysis 5 enhanced for Land variables

ERS

European Remote Sensing Satellite (ESA)

ESA

European Space Agency

EUMETSAT

European Organisation for the Exploitation of Meteorological Satellites

FAO

Food and Agriculture Organisation

FTP

File Transfer Protocol

GCOM

Global Change Observation Mission (JAXA)

GIMMS

Global Inventory Modelling and Mapping Studies

GLDAS

Global Land Data Assimilation System

GLWD

Global Lakes and Wetlands Database (GSPC/University of Kassel)

GPCC

Global Precipitation Climatology Centre

GPCP

Global Precipitation Climatology Project

GPM

Global Precipitation Measurement

GRACE

Gravity Recovery And Climate Experiment

GSWP

Global Soil Wetness Project

GTOPO30

Global 30 Arc-Second Elevation

HSP

Homogeneous (sensor) Sub-Periods

ICDR

Interim Climate Data Record

ICTB

Inter-Calibrated Brightness Temperature dataset

IIASA

International Institute for Applied Systems Analysis

ISMN

International Soil Moisture Network

ISRIC

International Soil Reference and Information Centre

ISS-CAS

Institute of Soil Sciences of the Chinese Academy of Sciences

ITRDB

International Tree-Ring Data Bank

JAXA

Dokuritsu-gyosei-hojin Uchu Koku Kenkyu Kaihatsu Kiko, (Japan Aerospace Exploration Agency)

JPL

Jet Propulsion Laboratory (NASA)

JRC

Joint Research Centre

LPRM

Land Parameter Retrieval Model

METOP

Meteorological Operational Satellite (EUMETSAT)

MIRAS

Microwave Imaging Radiometer with Aperture Synthesis (MIRAS)

MPDI

Microwave Polarization Difference Index

NASA

National Aeronautics and Space Administration

NDVI

Normalized Difference Vegetation Index

NESDIS

NOAA's National Environmental Satellite, Data, and Information Service

NIMA

National Imagery and Mapping Agency

NOAA

National Oceanic and Atmospheric Administration

NRT

Near Real Time

NSIDC

National Snow and Ice Data Center (radlab)

NWS

National Weather Service (NOAA)

QCM

Quantile Category Matching

RFI

Radio Frequency Interference

RMSE

Root Mean Square Error

SAR

Synthetic Aperture Radar

SCAT

Scatterometer

SM

Soil Moisture

SMAP

Soil Moisture Active and Passive mission

SMMR

Scanning Multichannel Microwave Radiometer

SMOS

Soil Moisture and Ocean Salinity (ESA)

SNR

Signal-to-Noise Ratio

SOW

Statement of Work

SSF

Surface State Flag

SSM

Surface Soil Moisture

SSM/I

Special Sensor Microwave Imager

TCA

Triple Collocation Analysis

TDR

Time Domain Reflectometry

TMI

TRMM Microwave Imager

TRMM

Tropical Rainfall Measuring Mission

TWS

Terrestrial Water Storage

USGS

United States Geological Survey

VIC

Variable Infiltration Capacity

VOD

Vegetation Optical Depth

VUA

Vrije Universiteit Amsterdam

WACMOS

Water Cycle Multimission Observation Strategy

WARP

Water Retrieval Package

WindSat

WindSat Radiometer