Acronyms
IABO
International Association for Biological Oceanography
IAC
Information-Analytical Centre, Russia
IARAS
Institute of Astronomy, Russian Academy of Sciences (formerly: LPAC; see also INASAN )
IAS
International Altimetry Service
IASPEI
International Association of Seismology and Physics of the Earth's Interior
IB
Inverted Barometer
IBGE
Instituto Brasileiro de Geografia e Estatística (Brazilian Institute of Geography and Statistics)
IC-SG
[IAG] Inter-Commission Study Group
IC-WG
[IAG] Inter-Commission Working Group
ICD
Interface Control Document
ICESat
Ice, Cloud, and land Elevation Satellite
ICP
[IAG] Inter Commission Project
ICSU
International Council for Science (now: ISC)
ID
Identification/Identifier
IDF
International DOI Foundation
IERS
International Earth Rotation and Reference Systems Service (formerly: International Earth Rotation Service)
IfE
Institut für Erdmessung [Institute of Geodesy], University of Hannover
IfG
Institute of Geodesy of the Graz University of Technology
IG2
IGS second reprocessing campaign
IGEX
International GLONASS Experiment
IGG, IGGB
Institute of Geodesy and Geoinformation (formerly: GIUB)
IGGOS
Integrated Global Geodetic Observing System (now: GGOS)
IGLOS
International GLONASS Service
IGMA
ICG Monitoring and Assessment Task Force
iGMAS
IGN
Institut National de l’Information Géographique et Forestière (formerly: Institut Géographique National)
IGOS-P
Integrated Global Observing Strategy - Partners
IGR
IGS rapid [products / satellite orbits]
IGRT
IGS rapid time (products)
IGS
International GNSS Service (formerly: International GPS Service)
IGS-RTS
IGS Real-Time Service
IGSN71
International Gravity Standardization Net 1971
IGST
IGS time scale
IGU
IGS 'ultra-rapid' [products / satellite orbits]
IHRF
International Height Reference Frame
IHRS
International Height Reference System
IIUL
integrated IGS Ultra LODs
ILRSA
ILRS official solution
ILS
International Latitude Service
ILW
international laser workshop / International Workshop on Laser Ranging
IMF
Isobaric Mapping Function
INAF
Istituto Nazionale di Astrofisica
INDIGO
Inter-service Data Integration for Geodetic Operations
INFN
Istituto Nazionale di Fisica Nucleare [National Institute for Nuclear Physics]
INGV
Istituto Nazionale di Geofisica e Vulcanologia
INPOP
Intégrateur Numérique Planétaire de l'Observatoire de Paris
INT
Intensive [VLBI session]
INT, Int.
International
Int.
Intensive [VLBI session]
IOC
Initial Operational Capability
IOV
In-Orbit Validation
IP
Internet Protocol
IPGP
Institut de Physique du Globe de Paris
IPGS
IPIE
Institute for Precision Instrument Engineering
IPMS
International Polar Motion Service
IR
infrared
IRA
Istituto di Radioastronomia
IRIS
International Radio Interferometric Surveying
IRM
IERS Reference Meridian
IRP
IERS Reference Pole
ISA
IAG Service Assessment
ISBN
International Standard Book Number
ISC
International Science Council (formerly ICSU)
ISGN
International Space Geodetic and Gravimetric Network
ISO
International Organization for Standardization
ISO TC
ISO Technical committee
ISO/TS
ISO Technical specification
IT
Information Technology
ITLW
International Technical Laser Workshop
ITRS
International Terrestrial Reference System
ITSS
Raytheon ITSS
IVP
invariant reference point
IVTW
International VLBI Technology Workshop
IWLR
International Workshop on Laser Ranging
