0R Zero Reformatted Data
6H Band 6 - high gain
6L Band 6 - low gain
A&P Archive and Production
A/D Analog/Digital
AA Active Archive
AAC Archive Advisory Committee
AADP Active Archive Data Package
ABML As-Built Materials List
ABPL As-Built Parts List
ABS Absolute
AC Alternate Current or Archive Cache
ACCA Automated Cloud Cover Assessment or Actual Cloud Cover Average
ACL Access Control List
ACQ Acquired Scenes Report
ACRES Australian Center for Remote Sensing
ACS Attitude Control System
ACSLS Automated Cartridge System Library Software
ACU Antenna Control Unit
ACWP Actual Cost of Work Performed
AD Active Directory
ADA Angular Displacement Assembly or Attitude Displacement Assembly
ADC After DC Restore or Ancillary Data Coorector
ADD Algorithm Description Document
ADF Ancillary Data File
ADIC Advanced Digital Information Corporation
ADM Administrative Message
ADML As-Designed Materials List
ADPL As-Designed Parts List
Attitude Displacement Sensors or Angular Displacement Sensor or
ADS Archive Data Stager
ADSA Attitude Displacement Sensor Assembly
ADVP Algorithm Development and Verification Plan
AEM Auxiliary Electronics Module
AES Advanced Encryption Standard
AFB United States Air Force Base
AFM Anomalous Frame Manager
AFWA Air Force Weather Agency
AGC Automatic Gain Control
AGE Automated Ground Equipment
AGS Alaska Ground Station
AIM Algorithm Integration Meeting
AIS Automated Information Security
ALI Advanced Land Imager
ALIAS Advanced Land Image Assessment System
AMP Allocation Management Planner
AN Ascending Node
ANSI American National Standards Institute
AO Authorization Official
AOI Area of Interest
AOS Acquisition of Signal or Arrival On-Site
API Application Programming Interface
APID Application Identification
AQPSK Asynchronous Quadrature Phase Shift Keying
AR Archive or Axial Ratio
AS Archive Server
ASA Archive Server Application or Alice Springs [Station] Australia
ASCII American Standard Code for Information Interchange
ASGUI Archive Server Graphical User Interface
ASHRAE American Society of Heating, Refrigeration and Air-Conditioning
ASIC Application Specific Integrated Circuit
ASN Alice Springs Ground Station
ASQC American Society for Quality Control
AST Active Scan Time
ASTER Advanced Spaceborne Thermal Emission and Reflection
ASTM American Society for Testing of Materials
ATBD Algorithm Theoretical Basis Document
ATCS Absolute Time Command Sequence
ATL Automated Tape Library
ATS Absolute Time Sequence
AUI Analyst User Interface
B&A Billing & Accounting
B1 Build 1
B2B Band-to-Band
BA Billing and Accounting
BAC Budget at Completion
BAD Block Address Data
BASIS+ Budget and Science Information System Plus
BATC Ball Aerospace & Technology Corporation
BCD Binary-Coded Decimal
BCH Bose-Chaudhuri-Hocquenghem Error Detection and Correction
BCR Baseline Change Request
BCWP Budgeted Cost of Work Performed
BCWS Budgeted Cost of Work Scheduled
BD Band
BER Bit Error Rate
BIL Band Interleaved by Line
BITSM Bureau Information Technology Security Manager
BME Brouwer Mean Element
BMOC Backup Mission Operations Center
BMOE Backup Mission Operations Element
BN Background Noise
BOE Basis of Estimate
BPDU Bitstream Protocol Data Unit
BPF Bias Parameter File
BPG Bias Parameter Generator
BPSK Biphase Shift Keying
BRDF Bi-directional Reflectance Distribution Function
BRDF-n Normalized Bi-directional Reflectance Distribution Function
BRDF-s Spectral Bi-directional Reflectance Distribution Function
BSP Best Security Practices
BSQ Band Sequential
BSTAR Drag-Related Parameter in the NORAD Two-Line Element
BSU Baseband Switching Unit
BSSC Bit Synchronizer / Signal Conditioner
BTC Bench Test Cooler
BTI Blank Tape Interface
BUTST Bureau Unix Technical Support Team
BWTST Bureau Windows Technical Support Team
C Centigrade
C& DH Command and Data Handling
C&A Certification and Accreditation
C3S NPOESS Command, Control, and Communications Segment
CA Conjunction Assessment or Control Account
CADU Channel Access Data Unit
CAGE Commercial and Government Entity
CAL Calibration Data
Cal/Val Calibration/Validation
CAM Control Account Manager
CAP Cartridge Access Port or Control Account Plan
CAPE Collection Activity Planning Element
CBA Cost Benefit Analysis
CBG Configuration and Build Guide
CC Cubic Convolution or Computer Compatible Tape or Cloud Cover
CCA Cloud Cover Assessment
CCB Configuration Control Board
CCD Charge-Coupled Device
CCM Cloud Cover Manager
Configuration Change Process, Contamination Control Process, or
CCP Cloud Cover Prediction
CCR Configuration Change Request
CCRS Canada Center for Remote Sensing
COI Cleanup System or Confirmed Contact Schedule or Constellation
CCS Coordination System
CCSDS Consultative Committee for Space Data Systems
CCT Computer Compatible Tape
CD Change Directory or Compact Disk
CDB Centralized Database
CDBS Centralized Database System
CDE Common Desktop Environment
CDI Capture Device Identifier
CDMS Carrier Doppler Measurement System
CDR Critical Design Review
CDRL Contract Data Requirements List
CD-ROM Compact Disk-Read Only Memory
CDS Coded Data Segment
CDT Central Daylight Time
CE Circular Error
CEOS Committee on Earth Observing Satellites
CERT Community Emergency Response Team
CF Correction Factor or Cloud Fraction
CFC Contact Forecast Confirmation or Cloud Fraction Climatology
CFDP CCSDS File Delivery Protocol
CFP Cold Focal Plane
CFPA Cold Focal Plan Array or Cold Focal Plane Assembly
CFR Code of Federal Regulations, Contact Forecast Request
CI Configuration Item
CIA Confidentiality, Integrity, and Availability
CIC Computer Interrupt Code
CIL Critical Items List
CIRC Computer Incident Reporting Center
CIS Center for Information Security
CIU Controls Interface Unit
CLCW Command Link Control Word
CLR Combined Labor Rate Contractor Labor Rate
CLTU Command Link Transmission Unit
cm Centimeter
CM Configuration Management
CMD Command
CMM Capability Maturity Model
CMO Configuration Management Office
CMP Configuration Management Plan
CMS Content Management System
CN Coherent Noise
CNDs Could-Not-Duplicates
CNR Carrier-to-Noise Ratio
CO Contract Officer or Content Owner
COC Certificate of Completion
COFUR Cost of Fulfilling a User Request
COG Center of Gravity or Continuity of Government
COI Common Order Interface
COLA Collision Avoidance
COMM Communications Subsystem
Con Ops Concept of Operations
CONAE Comision Nacional De Actividades Espaciales
CONOPS Concept of Operations
CONUS Continental United States
COOP Continuity of Operations
COR Contracting Officer Representative or Cost of Reproduction
COTR Contracting Officer’s Technical Representative
COTS Commercial Off-the-Shelf
CP Calibration Parameter
CPF Calibration Parameter File
CPI Cost Performance Index
CPIC Capital Planning and Investment Control
CPR Cost Performance Report
CPT Comprehensive Performance Test
CPU Central Processing Unit
CR Central Repository or Controlled Repository or Change Request
CR1 Computer Room 1
CR1MSS Computer Room 1 Mass Storage System
CR2 Computer Room 2
CR3 Computer Room 3
CRaM Combined Radiometric Model
CRC Cyclic Redundancy Check or Cyclic Redundancy Code
Customer Relationship Management or Continuous Risk
CRM Management
CRMP Continuous Risk Management Plan
CRSSGS China Remote Sensing Satellite Grand Station
CRTEST Central Repository Test
CS Customer Service
CSAM Cyber Security Assessment Management
CSC Computer Software Component
CSCI Computer Software Configuration Item
CSIRT Computer Security Incident Report Team
CSIS Control and Schedule Interface System
CSR Capture Success Rate, Capture Success Ratio
CSU Computer Software Units
CSV Comma Separated Values
CTE Calibration Test Equipment or Compatibility Test Equipment
CTP Command and Telemetry Processors
CTS Capture Transfer Subsystem
CTV Compatibility Test Van
CV Command Verification or Cost Variance
CVCDU Coded Virtual Channel Data Unit
Collected Volatile Condensable Material or Collected Volatile
CVCM Condensable Mass
CVDQA Calibration Validation Data Quality Assurance
CVE Calibration Validation Element
CVS Concurrent Versions System
CVT Calibration and Validation Team
CVWG Calibration-Validation Working Group
CWBS Contractor Work Breakdown Structure
D&M Development and Maintenance
D/L Downlink
D3 50GB Data tape cartridge from StorageTek
DA Document Administrator
DAAC Distributed Active Archive Center
DACA Days After Contract Award
DAE Data Acquisition Element
DAF Data Acquisition Facility
DAG Database Administrator Guide
DAM Data Acquisition Manager
DAP Data Acquisition Plan or Data Acquisition Planner
DAS Data and Applications Support
DAT Data Access Tool
DB Database or Data Block
dB Decibel
dB/K Decibel per Degree Kelvin
DBA Database Administrator
DBCI Database Configuration Item
DBDD Database Design Description or Database Description Document
dB-Hz Decibel-Hertz
dBi Decibel above isotropic
DBMS Database Management System
dBW Decibel Relative to 1 Watt
DC Direct Current
DC&P Data Capture and Processing Facility
DCCB DHF Configuration Control Board
DCN Document Control Number or Document Change Notice
DCPF Data Capture & Processing Facility
DCRS Data Collection and Routing Subsystem
DCRSf Data Collection and Routing Subsystem file router
Data Collection and Routing Subsystem interval router or Digital
DCRSi Cassette Recorder System Incremental
DCS Data Capture System or Data Characterization Subsystem
DCT Digital Cassette Tape
DDD Displacement Damage Dose
DDI DCS Data Ingest
DDL Database Definition Language
DDRC DPAS Design Reference Case
DDS DCS Database Server
DDT DPAS Test Team
DE Definitive Ephemeris
DEF Definitive Ephemeris Product
Delta-I Delta-inclination
DEM Digital Elevation Model
DEPEPH Definitive Ephemeris Product
DES Station Description Message
DET Escape Detection
DEU Digital Electronic Unit
DEV Development
DFCB Data Format Control Book
DFD Data Flow Diagram
DG Digital Globe
DHCP Dynamic Host Configuration Protocol
DHF Data Handling Facility
DHN Data Handling Node
DIAT Daily Image Annotation Tape
DID Data Item Description
DIR Direction
DIRT Data Interception by Remote Transmission
DIS Data Information System, Data Instrumentation System
DiTL Day in The Life
DLT Digital Linear Tape
DM Data Management or Document Management
DMA Direct Memory Access
DMF Data Migration Facility
DMR Detailed Mission Requirements
DMS Data Management Subsystem
DMSP Defense Meteorological Satellite Program
DMU Data Migration Utility
DMZ Demilitarized Zone
DN Descending Node or Digital Number
DNS Domain Name Server
DOC Department of Commerce
DoD Department of Defense
DOI Department of Interior
DOORS Dynamic Object-Oriented Requirements System
DOP Dilution of Precision
DOQ Digital Orthophoto Quadrangle
DORRAN Distributed Ordering, Research, Reporting, and Accounting Network
DoS Denial of Service
DOY Day-of-Year
DP Data Processing
DPA Destructive Physical Analysis
DPAS Data Processing and Archive System
DPS Data Processing Subsystem
DQA Data Quality Analyst
DQV Data Quality Validation
DR Delivery Record or Discrepancy Report or Disaster Recovery
DRAC Dell Remote Access Controller
DRB Discrepancy Review Board
DRFP Draft Request for Proposal
DRTS Data Reporting and Tracking Subsystem
DSL Days-Since-Launch
DSS Data Staging System or DPAS Subsetter
DST Data Support Team
DTED Digital Terrain Elevation Data
DTG Day Time Group
DTO Data Transfer Object
DTS Development and Training Simulations
DUNS Data Universal Numbering System
DV Data Validation
DV&E Data Validation & Exchange
DVD Digital Versatile Disc
DVD-R Digital Versatile Disc – Read Only
E&A Evaluation and Analysis
E&IT Engineering and Information Technology
EAC Estimate at Completion
EAR Export Administration Regulations
EAS Evaluation and Analysis Subsystem
Eb Energy per Bit
EBAS EROS Billing and Accounting System
EC Electronic Copy
ECC Error Correction Code
ECEF Earth-Centered, Earth-Fixed
ECI Earth Centered Inertial
ECITOD Earth Centered Inertial TRUE of Date
ECL Emitter-Coupled Logic
ECS EOSDIS Core System
ECV Essential Climate Variable
EDAC Error Detection and Correction
EDC EROS Data Center
EDDDR EDC Daily Discrepancy Report or EDC Daily Data Received Report
EDG EOS Data Gateway
EDU Engineering Development Unit
EE Earth Explorer
EEE Electrical, Electronic, Electromechanical
EFS Encrypting File System
EGSE Electrical GSE
EIA Electronic Industry Alliance
EIRP Effective Isotropic Radiated Power
EIS External Interface Specification
EJB Enterprise Java Beans
EL1PS EDC Level 1 Prototype System
ELV Expendable Launch Vehicle
e-mail Electronic Mail
EMC Electromagnetic Compatibility
EMI Electromagnetic Interference
EMP Electromagnetic Pulse
ENVI Environment for Visualizing Images
EO-1 Earth Observing 1
EOC Earth Observation Center
EOIS Earth Observation Data & Information Systems
EOL End-of-Line
EOM End of Mission
EOS Earth Observing System
EOSAT Earth Observation Satellite Company
EOSDIS EOS Data and Information System
EPA Euler Parameter
EPF ETM+ Processing Facility
EPGN EOS Polar Groundstation Network
EPR Engineering Peer Review
EPS Electrical Power Subsystem
EPSG European Petroleum Survey Group
ERB Engineering Review Board
ERD Entity Relationship Diagram
EROS Earth Resources Observation and Science
ERR Error
ERTS Earth Resources Technology Satellite
ESA European Space Agency
ESB Enterprise Service Bus
ESD Earth Science Division
ESDIS Earth Science Data and Information System
ESMO Earth Science Mission Operations
ESN Enterprise Services Network
ESRIN European Space Research Institute
ESUN Solar Spectral Irradiance
ETC Estimate to Completion
ETE End to End
ETL Extraction, Translation, Load
ETM+ Enhanced Thematic Mapper Plus
ETRO Estimated Return to Operations
EU Engineering Unit
EV Earned Value
EVDCU Extended Virtual Channel Data Unit
EVM Earned Value Management
EVMS Earned Value Management System
EVP Environmental Verification Plan
EVS Earth-Vehicle-Sun angle or Earned Value System
EWR Eastern and Western Ranges
EWW Extended Work Week
F&PS Functional and Performance Specifications
FAC Full Aperture Calibrator
FAQ Frequently Asked Question
FAR Federal Acquisition Regulation
FASC Full Aperture Solar Calibrator
FAST-L7A FAST-Landsat 7 Format
FAX Facsimile Transmission
FBI Federal Bureau of Investigation
FC Formulation Contractor
FCA Functional Configuration Audit
FC-AL Fiber Channel-Arbitrated Loop
FCDAS Fairbanks Command and Data Acquisition Station
FD Flight Dynamics
FDC Failure Detection and Correction
FDD Facilities Definition Document or Format Description Document
FDDI Fiber-Distributed Data Interface
FDF Flight Dynamics Facility
FDIR Fault Detection, Isolation, & Recovery
FEC Forward Error Corrected
FEMA Federal Emergency Management Agency
FFS Fiscal Financial System
FFT Fast Fourier Transform
FGDC Federal Geographic Data Committee
FHS First Half Scan
FHSERR First Half Scan Error
FIA Final Implementation Agreement
FIFO First Ordered, First Processed
FIPS Federal Information Processing Standards
FIR Finite Impulse Response
FISCAM Federal Information System Control Audit Manual
FISMA Federal Information Security Management Act
FMEA Failure Mode and Effect Analysis
FMECA Failure Modes, Effects, and Criticality Analysis
FMFIA Federal Manager’s Financial Integrity Act
FMT Format
FNMOC Fleet Numerical Meteorology and Oceanography Center
FOIA Freedom of Information Act
FOP Flight Operations Plan
FOR Flight Operations Review
Flight Dynamics Facility Orbit and Mission Aids Transformation
FORMATS System
FOS Flight Operations Segment
FOT Flight Operations Team
FOTS Free Off-The-Shelf
FOV Field of View
FPA Focal Plane Assembly or Focal Plane Array
FPE Focal Plane Electronics
FPGA Field-Programmable Gate Array
FPM Focal Plane Modules
FQT Formal Qualification Testing
FRB Full-Resolution Browse
FRED Framed Raw Expanded Data
FRS File Retrieval System
FS Forecast Schedules
FSD Flight Systems Development
FSSC Financial Support Services Contract
FSV Flight Software Vendor
FSW Flight Software
FTA Fault Tree Analysis
FTD File Transfer Daemon
FTE Full Time Equivalent or Full Time Employee
FTP File Transfer Protocol
FW Firewall or Full Width
FWHM Full Width Half Maximum
FY Fiscal Year
G/T Gain over Temperature
G&A General and Administrative
GAM Geography Analysis and Monitoring
GAO General Accounting Office
GAQD Originator Routing Code for IIRV Messages
GB Gigabyte
GBFOM Global Band Figure of Merit
GBICS Gigabit Interface Converters
GCCB Ground Segment Configuration Control Board
GCOR Temperature corrected Gains
GCP Ground Control Point
GCTP General Cartographic Transformation Package
GDS Ground Data Systems
GEO Geolocation Index File
GEOM Geometric
GeoTIFF Geographic Tagged Image File Format
GEVS General Environmental Verification Specification
GFE Government-Furnished Equipment
GFS Global File System
GFY Government Fiscal Year
GIA Government Inspection Agency
GIDEP Government Industry Data Exchange Program
GigE Gigabit Ethernet
GIO Geographic Information Officer
GIPS Geo-Informatics Products and Solutions
GISRA Government Information Security Reform Act
Geo-Informatics and Space Technology Development Agency
GISTDA (Thailand)
GLC Ground Look Calibration Request or Gilmore Creek
GloVis Global Visualization Viewer
GLS Global Land Survey
GMAP Global Monitoring Acquisition Plan
GMT Greenwich Mean Time
GN Ground Network
GNE Ground Network Element
GNE-DCRS Ground Network Element Data Collection and Routing System
GNERD GNE Requirements Document
GOES Geostationary Operational Environmental Satellite
GOP Ground Operations Plan
GOT Ground Operations Team
GOTS Government Off The Shelf
GP4 General Perturbations Theory
GPD GSFC Policy Directive
GPL General Public License
Geometric Processing System or Gap Phase Statistic or Global
GPS Positioning System
GRI Ground Reference Image
GRIB Gridded Data
GRM Ground Readiness Manager
GRS Grid Reference System (SPOT)
GRT Ground Readiness Test
GRTT Ground Readiness Test Team
GS Ground System or Ground Segment
GSA U.S. General Services Administration or Ground Station Analyst
GSC Ground Station Controller
GSD Ground Sampling Distance or Guide Star Data
GSE Ground Support Equipment, Ground Station Engineers
GSFC Goddard Space Flight Center
GSI Ground Station Identifier or Ground System Infrastructure
GSIRD Ground System Interface Requirements Document
GSL GNU Scientific Library
GSM Ground System Manager
GSRD Ground System Requirements Document
Guide for Developing Security Plans for Information Technology
GSSP Systems
GST Geographic Support Team or Ground Station Technician
GSTDN Ground Spaceflight Tracking and Data Network
GSWG Ground System Working Group
GUI Graphical User Interface
GXA Gimbaled X-band Antennae
H/W Hardware
HC Hard Copy
HCR Hardware Configuration Request
HDF Hierarchical Data Format
HDF5 Hierarchical Data Format Version 5
HDF5-EOS Hierarchical Data Format Version 5 - Earth Observing System
HDR Header
HDRM High Data Rate Modem
HDS Horizontal Display Shift
HDT High Density Tape
Hex Hexadecimal
HK Housekeeping
HLD High-Level Document
HPA High Power Antenna
HPN Panchromatic Band Header File
HQ Headquarters
HRV High Resolution Visible (SPOT sensor)
HSM Hierarchical Storage Management or Hierarchical Storage Manager
HSPD Homeland Security Presidential Directive
HTM Thermal Bands Header File
HTML Hypertext Markup Language
HTTP Hypertext Transfer Protocol
HTTPS Hypertext Transfer Protocol Secure
HUB Historically Underutilized Business
HVAC Heating Ventilation Air Conditioning
HVU High Volume User
HWCI Hardware Configuration Item
Hz Hertz
I In-Phase Channel
I&T Integration and Test
I/O Input/Output
I2RV Improved Inter-Range Vector Message
IA Implementing Agreement
IAC Independent Assurance Contractor
IAD Ion-Assisted Deposition
Image Assessment Subsystem (LDCM) or Image Assessment
IAS System
IASICP IAS Internal Calibrator Pulse
IAW In Association With
IBM International Business Machines
IBR Integrated Baseline Review
Interface Control or International Cooperator or Internal Calibrator or
IC Internal Cache
ICD Interface Control Document
ICe Internal Calibrator processing for Emissive bands
ICF Initial Correction Factor
ICMP Internet Control Message Protocol
ICO International Cooperator Office
ICT Interface Connectivity Testing
Independent Calibration and Verification Segment or Independent
ICVS Characterization and Verification System
ID Infrastructure Design, Interface Documents, or Identification
IDD Interface Definitions Document
Integrated Device Electronics or Infrastructure Development or
IDE Integrated Development Environment
IDF Interval Definition File or Image Data File
IDPS Image Data Processing Subsystem
IDR IAS Data Recorder
IDS Intrusion Detection System
IE Infrastructure Element
IEEE Institute of Electrical and Electronics Engineers
IETF Internet Engineering Task Force
IF Intermediate Frequency
IFAT ITOS File Accounting Tool
IFOV Instrument Field of View or Instantaneous Field of View
IGMP Internet Group Management Protocol
IGS Integrated Security Gateway or International Ground Station
IIRV Improved Inter-Range Vector
ILI IGS to LAM Interface
IM Instant Message
IMF Inverse Minor Frames or Interval Metadata File
IMP Information Management Plan or Integrated Master Plan
IMS Integrated Master Schedule or Information Management System
IMU Inertial Measurement Unit or Internal Measurement Unit
IMWD Internet Moving Window Display
IN Impulse Noise or Ingest
INFOSEC Information Security
INPE National Institute for Space Research
Initial Operational Capability, Initial On-orbit Checkout, Installation
IOC Operational Certification, or In-Orbit Checkout
IOE Instrument Operations Element
IONET IP Operational Network
IP Internet Protocol or Installation Plan
IPC Institute for Interconnecting and Packaging Electronic Circuits
IPDU Internet Protocol Data Unit
IPE Image Processing Element
IPM IGS Priority Mask Online Tool
IPO Integrated Program Office
IPR Intersegment Problem Report
IPS Intrusion Prevention System
IPSR Instrument Pre-Ship Review
IPT Integrated Project Team
IRD Interface Requirements Document
IRFP Implementation Request for Proposal
IRP Incident Reporting Plan
IRS Interface Requirements Specification
IRU Inertial Reference Unit
IRV Improved Inter-Range Vector Message
Internet Security and Acceleration or Interconnection Security
ISA Agreement
iSCSI Internet Small Computer System Interface
ISD Interface Specification Document
ISI Integral Systems Incorporated
ISL Inter-Switch Link
ISO International Standards Organization
ISSO Information System Security Official
IT Information Technology or Integration Test
ITAR International Traffic in Arms Regulations
ITC Integration Test Case
ITS Information Technology Services
ITSNOC Information Technologies Service Network Operations Center
ITSOT Information Technology Security Operations Team
ITSS Information Technology and Scientific Services
IU Individual User
IUR Individual User Request
IV&V Independent Verification and Validation
IVM Interface Verification Matrix
IWG Interface Working Group
J2EE Java 2 Platform, Enterprise Edition
JaxB Java Architecture for XML Binding
JBOD Just a Bunch Of Disks
JBOSS J2EE Application Server
JMS Java Messaging Service
JPEG Joint Photographic Experts Group
JPF Job Parameter File
JPL Jet Propulsion Laboratory
JSP Java Server Pages
JSpOC Joint Space Operations Center
JSR Java Portlet Specification
JVM Java Virtual Machine
K Degrees Kelvin
KB Kilobyte
KHB Kennedy Space Center Handbook
kHz Kilohertz
km Kilometer
KML Keyhole Markup Language
KVM Keyboard Video Mouse
L0 Level 0
L0R Level 0 Reformatted
L0Ra Level 0 Reformatted Archive
L0Rc Level 0 Reformatted Corrected
L0Rp Level 0 Reformatted Product
L1 Level 1
L1G Level 1 Systematic (Corrected)
L1Gs Level 1 Geometric Systematic
L1Gt Level 1 Systematic Terrain (Corrected)
L1P Level 1 Precision (Corrected)
L1R Level 1 Radiometric (Corrected)
L1SE Level 1 Sustaining Engineering
L1T Level 1 Terrain (Corrected) or Level 1 Precision and Terrain
L5 Landsat 5
L7 Landsat 7
L8 Landsat 8
LACS Landsat Archive Conversion System
LADS LDCM Archive and Dissemination Segment
LAM Landsat Archive Manager
LAM AS LAM Archive Server
LAM008 Interface Between COI PS and L0Rp PS
LAN Local Area Network
LAS Land Analysis System
LASP Laboratory for Atmospheric and Space Physics
LAT Latitude
LC LDCM Contractor
LCC Lambert Conformal Conic
LCCB Landsat Configuration Control Board
LCCR Landsat Configuration Change Request
LCG Landsat Coordination Group
LCGS LDCM Contractor Ground Segment
LCSS LDCM Contractor Space Segment
LDAP Lightweight Directory Access Protocol
LDB IAS Local Database
LDCC Landsat Data Continuity Contract
LDCM Landsat Data Continuity Mission
LDI LPS Data Ingest or L0Ra Data Ingest
LDIF LDAP Data Interchange Format
LDIS LAM to DORRAN Interface System
LDPC Low Density Parity Check
LDPS Landsat Data Purchase System
LDRCS LDCM Document Review Comment Spreadsheet
LDTS LPS Data Transfer Subsystem
LEDAPS Landsat Ecosystem Disturbance Adaptive Processing System
LEI LAM to ECS Interface
LEM Lower Equipment Module
LEO Low Earth Orbiting
LES Log file Extraction Services
Level A Level Zero Aggregated
LG L0Ra Generator
LGGS Landsat Global Geodetic Standard
LGN Landsat 7 Ground Network or LDCM Ground Network
LGPL Lesser General Public License
LGS Landsat 7 Ground System or LDCM Ground System
LGSOWG Landsat Ground Station Operations Working Group
LHC Left-Hand Circular
LHCP Left-hand Circularly Polarized
LHS Left-hand Side or Left-Hand SLO
LID Landsat and LDCM Inventory Database
LIM Landsdat Inventory Management
LIMB LAM Interface for Metadata and Browse
LIS Landsat Integration System or LACS Inventory System
LITAP Landsat Intersegment Technical Assessment Panel
LL Lower Left
LLI LAM to LACS Interface
LM Labeled Mask
Lmax Maximum Radiance
LMC Lockheed Martin Corporation
LMD Landsat Mission Database or LDCM Mission Database
LMDD Landsat Metadata Description Document
LMI Lower Equipment Module Interface
LMMS Lockheed Martin Missiles and Space
LMST Local Mean Solar Time
LMWS Landsat Mission Web Site
LNA Low Noise Amplifiers
LOE Level of Effort
LON Longitude
LOOFA Landsat 7 On-Orbit Flight Automation
LOS Loss of Signal or Line-of-Sight
LP DAAC Land Processes Distributed Active Archive Center
Level 1 Product Distribution System or LDCM Data Product
LPDS Specification
Level 1 Product Generation System or Level 1 Product Generation
LPGS Subsystem (LDCM)
LPO LDCM Program Office
LPS Landsat 7 Processing System
LPSNG Landsat Processing System Next Generation
LPSO Landsat Project Science Office
LPT Limited Performance Test
LR Lower Right
LRD Launch Readiness Date
LRMB LDCM Risk Management Board
LRR Launch Readiness Review
LS Launch Segment
LSATH High Saturation Radiance
LSATL Low Saturation Radiance
LSB Least Significant Bit
LSC Landsat Security Committee
LSDS Land Satellites Data System
LSF Linespread Function
LSIMSS LDCM Scalable Integrated Multi-Mission Support System
LSO LDCM Science Office
LSQAT Landsat Science Quality Assurance Team
LSR Launch Support Room
LSS Launch Services Segment
LST Landsat Science Team
LTA Long Term Archive
LTAP Long-Term Acquisition Plan
LTAS Landsat Trending and Analysis System
LTI Legacy Tape Ingest
LTO Linear Tape Open
LTS LACS Transcription System
LTVA Limited Technical Vulnerability Assessment
LTWG Landsat Technical Working Group
Ltypical Typical Radiance
LV Launce Vehicle
LVDT Linear Variable Differential Transformer
LWIR Long Wavelength Infrared
m meter
M&PCB Materials and Processes Control Board
M&PCP Materials and Processes Control Program
Mission Archive or Multiple Access or Major Application or Mission
MA Assurance
MAC Media Access Control or Monitor and Control Subsystem
MSS-X Archive Conversion System or Monitor and Control
MACS Subsystem
MAE Materials Assurance Engineer
MAID Massive Array of Idle Disks
MAM Mission Assurance Manager
MAP Mission Assurance Plan
MAR Mission Assurance Requirements
MAS MODIS Archive System
MB Megabyte
Mbps Megabit per Second
MC MAC Controller
MCDL Master Controlled Document List (LDCM)
MCDR Mission Critical Design Review
MCM Multi-Chip Module
MCS Monitor and Control Subsystem
MD Metrics Database or Mission Data or Mission Data
MD5 Message-Digital Algorithm 5
MDA MacDonald, Dettwiler, and Associates
MDGLS Mid-Decadal Global Land Survey
MDH Mission Data Header
MDIO Mission Data Input / Output
MMO Database System or MMO Database Subsystem (MDS)
MDS (LDCM)
ME Memory Effect
MEB Materials Engineering Branch
MF Minor Frame
mf minor frame
MFC Microsoft Foundation Classes or MAC Fetch CPF
MFPS Major Frame Processing Subsystem
MG Metadata Generator
MGS MODIS Ground Station
MHz Megahertz
MIL Materials Identification List or MAC Inventory L0Ra
MISR Multiangle Imaging SpectroRadiometer
MJF Major Frame
MJP MAC Job Processor
MLDRCS Master LDRCS
MLI MACS to LAM Interface
MLT Mean Local Time
mm Millimeter
mm/hr Millimeters per Hour
MMO Mission Management Office
MMOIO Mission Management Office Information Officer
MMOSA MMO Security Activity
MMOSE Mission Management Office Systems Engineer
MMR Mission Requirements Review
MMS MDGLS Management System or Multimission Modular Spacecraft
MO&DSD Mission Operations and Data System Directorate
MOA Memorandum of Agreement
MOC Mission Operations Center
MODIS Moderate Resolution Imaging Spectrometer
MODNET MO&DSD Operational/Development Network
MODTRAN Moderate Resolution Transmittance atmospheric modeling software
MOE Mission Operations Element
MOERD Mission Operations Element Requirements Document
MOI Moment of Inertia
MOM Mission Operations Manager
MOPSS Mission Operations Planning and Scheduling System
MOR Mission Operations Room or Mission Operations Review
MOS Mission Operations Simulation
MOTS Mission Off-The-Shelf
MOU Memorandum of Understanding
MOVE Mission Operations Voice Enhancement
MP Multi-processor
MPLS Multi Protocol Label Switching
MPR Monthly Progress Review
MPS MODIS Processing System or Mission Plan System
MPSR Management Program Status Review
MR Management Reserve
MRB Milestone Review Board or Material Review Board
MRR Mission Requirements Review
MRT Mission Readiness Testing
MRTG MultiRouter Traffic Grapher
ms millisecond
MS Multispectral
msb Most Significant Bit
MSB Most Significant Byte
MSCD Mirror Scan Correction Data
MSE Mission Systems Engineering
MSFC Marshall Space Flight Center
MSK Receive Antenna Horizon Mask Message
MSM MultiService Mobility or Mission Simulations Manager
MSPSP Missile System Prelaunch Safety Data Package
MSR Monthly Status Review
MSS Multispectral Scanner or Mass Storage System
MSS-A Multispectral Scanner - Archive Format
MSS-P Multispectral Scanner - Processed Format
MSS-X Multispectral Scanner data, reformatted CCT-X data
MST Mission Support Team
MTA Metadata
MTDSS MS and TM Data Subsetting System
MTF Modulation Transfer Function
MTFC Modulation Transfer Function Compensation
MTL Level 1 Metadata
MTP Distribution Product Metadata
MTS MDS Transformation Services
MTTR Mean Time to Restore or Mean Time to Repair
MUA Materials Usage Agreement
mW milliWatt
MWD Moving Window Display
N/A Not Applicable
N0 Noise Density
NARA National Archive and Records Administration
NAS NASA Assurance Standard
NASA National Aeronautics and Space Administration
Nascom NASA Communications
NASDA National Space Development Agency (Japan)
NAVOCEANO Naval Oceanographic Office
NBR Normalized Burn Ratio or Navigation Base Reference
NCAS National Carbon Accounting System
NCC Network Control Center
NCEP National Centers for Environmental Prediction
NCSA National Center for Supercomputing Applications
NCT Network Connectivity Test
NDE Non-Destructive Examination
NDF NLAPS Data Format
National Satellite Land Remote Sensing Data Archive (NSLRSDA)
NDP Data Package
NDPF NASA Data Processing Facility
NDSI Normalized Difference Snow Index
NDVI Normalized Difference Vegetation Index
NEDL Noise Equivalent Detector Radiance
NEDT Noise Equivalent Detector Temperature
NEMA National Electrical Manufactures Association
NEN Near Earth Network
NEOS National Earth Orientation Service
NEPAG NASA EEE Parts Assurance Group
NESDIS National Environmental Satellite Data and Information Service
NewOps New Operational Procedures System
NFS Network File System
NG National Guard
NGA National Geospatial Intelligence Agency
NGST Northrop Grumman Space Technology
NHB NASA Handbook
NIPD Network Interface Planning Document
NIR Near-infrared
NISN NASA Integrated Services Network
NIST National Institute for Standards and Technology
NITF National Imagery Transformation Format
NLAPS National Land Archive Production System
nm Nanometer
NMAS National Map Accuracy Standards
NMD National Mapping Discipline
NMS Network Management Software
NN Nearest Neighbor
NOAA National Oceanic and Atmospheric Administration
NOC NUGS Operations Concept
NOLAN Nascom Operational Local Area Network
NOM Network Operations Manager
NOR NORAD Two Line Element Message
NORAD North American Air Defense
NOVAS Naval Definitionl Vector Astronomy Software
NPD NASA Policy Directive
NPOESS National Polar-orbiting Operational Environmental Satellite System
NPSL NASA Parts Selection List
NPV Net Present Value
NRCA Nonconformance Reporting and Corrective Action
NRT Network Readiness Test
NRTL Nationally Recognized Testing Laboratory
NRZ-L Non-Return to Zero-Level
NRZ-M Non-Return to Zero-Mark
NSA National Security Agency
NSDI Normalized Snow Difference Index
NSLRSDA National Satellite Land Remote Sensing Data Archive
NSM Network and Security Manager
NSPAR Nonstandard Parts Approval Request
NSS NASA Safety Standard
NSSDC National Space Science Data Center
NTE Not To Exceed
NTP Network Time Protocol
NUC Non-Uniformity Correction
NUGS NASA-USGS Joint Ground System
NWS National Weather Service
O&M Operations & Maintenance
OA Operational Archive or Operations Agreement
OBC Onboard Computer
OBP On-Board Processor
OBS Organizational Breakdown Structure
OC Online Cache or Operations Concept
OCC Operator Control Console or Occurrence
OCD Operations Concept Document
OCI Organization Conflict of Interest
ODC Other Direct Costs
ODL Object Description Language
OE Operations Engineer
OFE Order Fulfillment Element
OGC Open Geospatial Consortium
OHS Order Handler Subsystem
OIV On-orbit Initialization and Verification
OLAP On-Line Analytical Processing
OLI Operational Land Imager
OM Operations and Maintenance
OMA Oblique Mercator Type A
OMB Office of Management and Budget or Oblique Mercator Type B
OMS Optimum Management System
OOB Out-of-Band
OPM Office of Personnel Management
OPR Office of Primary Responsibility
OPS Operations
Ops Con Operations Concept
OR Operations Readiness
ORR Operations Readiness Review
ORT Operational Readiness Test
OQPSK Offset Quadrature Phase Shift Keying
OS Operating System
OSHA Occupational Safety and Health Administration
OSI Open Systems Interconnection
OSS Object Storage Server or Operations Support Simulations
OSSMA GSFC Office of Systems Safety and Mission Assurance
OST Object Storage Target
OSTP Office of Science and Technology Policy
OTF Optical Transfer Function
OUI Operator User Interface
OVAD Operational Verification Acceptance Document
OVAP Operational Verification Acceptance Period
OWSGUI Oracle Web Service GUI
P&C Project Management and Controls
PAC Partial Aperture Calibrator
PAM Pluggable Authentication Module
PAN Production Acceptance Notification or Panchromatic
PAPH Pseudo Average Pulse Height
PAPL Project Approved Parts List
PAR Post Assessment Report
PASC Partial Aperture Solar Calibrator
PB Playback or Petabyte
PBL Project Baseline Log
PBTLM PB X-Band Housekeeping Telemtry
PC Personal Computer, Polyconic, or Production Control
Physical Configuration Audit, Physical Channel Access, or Point of
PCA Closest Approach
Pcache Processing Cache
PCB Parts Control Board or Project Control Board
PCD Payload Correction Data
PCDS Payload Correction Data Subsystem
PCI Peripheral Component Interface
PCI-E Peripheral Component Interconnect Express
PCI-X Peripheral Component Interconnect Extended
PCP Parts Control Plan
PCS Process Control Subsystem
PCSS Program Coordinate Systems Standards
PCU Power Control Unit
PD Product Distribution or Position Description
PDD Presidential Decision Directive
PDF Portable Document Format or Payload Data Formatter
PDI Product Delivery Interface
PDL Product Design Lead
PDPS USGS – Planning and Data Processing Segment
PDR Product Delivery Record or Preliminary Design Review
PDRD Product Delivery Record Discrepancy
PDRM Product Delivery Receipt Mechanism
PDS Product Distribution System
PDU Protocol Data Unit
PER Performance Evaluation Review or Pre-Environmental Review
PF Polarization Factor
PF1 Poker Flats 1
PFPA Prime Focal Plan Assembly
PFR Problem / Failure Report
PG Product Generation
Product Generation System (Generic Name for NLAPS) or Product
PGS Generation Subsystem
PHA Preliminary Hazard Analysis
PI Primary Investigator
PIA Project Implementation Agreement
PII Personally Identifiable Information
PIL Parts Identification List
PIP Premium Internet Protocol
PKI Public Key Infrastructure
PKO Project Kick-Off
PL Public Law
PL-DRO Phase Locked Dielectric Resonance Oscillator
PM Phase Modulation or Program Management or Project Management
PMC Performance Monitoring Counter
PMB Performance Measurement Baseline
PMBOK Project Management Book Of Knowledge
PMO Persistent Mission Object
PMP Project Management Professional
PMPDR Physical Media Product Delivery Record
PMPDRD Physical Media PDR Discrepancy
PN Pseudorandom Noise
PNTR Pointer
PO Project Owner
POA&M Plan of Action and Milestones
POC Point of Contact
POJO Plain Old Java Object
POSC Petrotechnical Open Software Corporation
PP Planning Package
PPF Payload Processing Facility
PPL Preferred Parts List
ppm Parts Per Million
PPOC Procurement Point of Contact
PR Program Review or Problem Report
PRA Paperwork Reduction Act or Probabilistic Risk Assessment
PRB Problem Report Message
PRD Project Reference Database
PRI Priority Mask Message
PS Polar Stereographic or Production Server
PSA Pre Security Assessment
PSD Power Spectral Density
PSF Point Spread Function
PSK Phase Shift Keyed
PSLA Project Service Level Agreement
PSM Project Safety Manager
Priority/Service Request Mask File or Pre-Ship Review or Pre-
PSR Shipment Review, or Program Status Review
PTP Primary Transfer Program or Programmable Telemetry Processor
PTR Post-Test Review
PTS Project Task Structure
PVCS Polytron Version Control System
PVL Parameter Value Language
PWB Printed Wiring Board
PWBS Project Work Breakdown Structure
PWS Project Web Site
Q Quadrature Channel
Q&A Quality and Accounting
QA Quality Assurance
QAA Quality Assurance Audit
QB Quality Board or Quality Band
QC Quality Control
QCM Quartz Crystal Microbalance
QFS Quick File System
QMM Landsat Quarterly Management Meeting
QMP Quality Management Plan
QMS Quality Management System
QPSK Quadrature Phase Shift Keying
QWR Quarterly Web Review
R&D Research and Development
R/T Receive/Transmit
R0C A stage of Radiometric Processing; Radiometric Calibration
R0R A stage of Radiometric Processing; Radiometric Artifacts Collection
R1R A stage of Radiometric Processing; Cosmetic Changes
R21 Resource 21
RAC Real Application Cluster
RAD Radiometric
RAID Redundant Array of Independent Disks
RAM Random Access Memory or Responsibility Assignment Matrix
RAS Reliability, Availability, Serviceability
RBS Reflective Band Sensor
RBV Return Beam Vidicon
R-C Resistor-Capacitor
RCC Raw Computer Compatible
RCN Revision Control Number
RCR Remote Constrolled Repository
RDBMS Related Database Management System
RDCS Raw Data Capture Subsystem
RDPS Raw Data Processing Subsystem
RDS Raw Data Subsetter
RDSS RCC Data Subsetter
RE Requirements Engineer and Responsible Engineer
REC Recovery Time
REL Relative
REQ Service Request Message
RF Radio Frequency
RFA Request for Action
RFC Request for Comments
RFP Request for Proposal
RG Relative Gain
RGB Red Green and Blue Color Value
RHC Right-hand Circular
RHCP Right Hand Circularly Polarized
RHS Right-hand Side or Right-hand SLO
RIDS Review Item Discrepancies
RIM Risk Information Management Tool
RIS24 24-bit Raster Image
RITSO Regional IT Security Officer
RLUT Response Linearization Look Up Table
RM Requirements Management or Risk Manager or Resource Manager
RMB Risk Management Board
RMD Risk Management Database
RMP Requirements Management Plan
RMR Risk Management Record
RMS Root-Mean-Square
RMSE Root Mean Square Error
RN Random Noise
ROI Return on Investment
ROIC Read-Out Integrated Circuit
ROLE Robotic Lunar Observatory
ROLO Robotics Lunar Observatory
ROM Rough Order of Magnitude
RPM Revolutions per Minute
RPS Radiometric Processing Subsystem
RRAS Routing and Remote Access Services
R-S Reed-Solomon
RSR Relative Spectral Responses
RSS Reuse Subsystem or Really Simple Syndication
RT Real Time
RTA Roof Top Antenna
RTC Remote Telemetry and Command Unit
RTCS Relative Time Command Sequence
RTF Rich Text Format
RTS Relative Time Sequence
RX Receive
S&O Search and Order
S/C Spacecraft
S/W Software
Spacecraft Analyst, Single Access, or Systems Administrator or
SA Storage and Archive Subsystem
SA-AC Storage Archive - Archive Cache
SAC Satellite Application Centre (South Africa)
SAG System Administrator Guide
SA-IC SA – Internal Cache
SAIC Science Applications International Corporation
SAM Scan Angle Monitor or Storage Archive Manager
SAN Storage Area Network
SANS System Administration, Networking, and Security Institute
SA-PC Storage Archive - Processing Cache
SARR Security Assessment Response Report
SAS Serial Attached SCSI
SAT Site Acceptance Testing
SATA Serial Advanced Technology Attachment
SAW Systems Analysis Workgroup
SBG Software Build Guide
SBRS Santa Barbara Remote Sensing
SC Spacecraft, or Science Campaign
SCA Sensor Chip Assembly
SCC Stress Corrosion Cracking or System Control Center
SCH Contact Schedule Message
SCI Software Configuration Item
SCID Spacecraft Identifier
SCL Signal Conditioning Unit - Lower Equipment Module
SCM Software Configuration Management
SCN Scan
SCP Standard Controls Processor
SCR System Concept Review
Scan-Correlated Shift, Satellite Checkout Station, or NOAA/IPO
SCS Space and Communications Segment
SCSI Small Computer Software Interface
SD South Dakota or Scan Direction
SDD Software Design Document
SDF Software Development File
SDLC System Development Life Cycle
SDLT Super DLT
SDM Silo Data Manager
SDMP Software Development Management Plan
SDP Software Development Plan or Science Data Production
SDPS Support Data Processing Subsystem
SDR System Design Review
SDS Scientific Data Set
SDU Service Data Unit
SE Systems Engineer
SEB Source Evaluation Board
SED Software Engineering Department
SEE Single-Event Effect
SEI Software Engineering Institute
SEIT System Engineer Integration and Test
SEL Single-Event Latchup or Software Engineer Lead
SelfDef SelfDefining CMDA format
SEMP Systems Engineering Management Plan
SEU Single Event Upset - Anomaly Event
SEV Severity or Sun-Earth-Vehicle angle
SF Service Framework
SFC Scene Framing Component
SFFT Short Form Functionality Testing
SFTP SSH File Transfer Protocol
Sg/SG6 Svaldbard Ground Station
SGDAWG Space to Ground Data Acquisition Working Group
SGI Silicon Graphics Incorporated
SGS Svalbard Ground Station or Spitzbergen Ground Station
SHC Shutter Histogram Characterization
SHS Second Half Scan
SHSERR Second Half Scan Error
Searchable Inventory or Space Imaging or Science Instrument or
SI Système International
SID Searchable Inventory Database
SIFMT Scene to Interval to File Mapping Table
SIG Signaling
SIP Standard Internet Protocol
SIR Scientific Investigations & Research
SIRU Scalable Inertial Reference Unit
SITP Software Integration Test Plan
SL Scan Line
SLA Service Level Agreement
SLAM Storage Location Allocation Manager
SLAT Spacecraft Location and Attitude Tape
SLATE System Level Automation Tool for Enterprises
SLD Scan Line Data
SLL Scan Line Length
SLO Scan Line Offset
SLOC Standard Lines of Code
SLP Service Location Protocol
SLS Scan Line Start
SM Schedule Manager or Scan Mirror
SMA Safety and Mission Assurance or S-Band Multiple Access
SMAP Safety and Mission Assurance Plan
SMD Stored Mission Data
SME Scan Mirror Electronics or Subject Matter Expert
SMP Software Maintenance Plan
SMRD Science and Mission Requirements Document
SMS System Management Server
SN Space Network
SNAS Space Network Access System
SNMP Simple Network Management Protocol
SNR Signal-to-Noise Ratio
SO Search and Order
SOA Service-Oriented Architecture or Satellite Operator Agency
SOH State of Health
SOM Space Oblique Mercator
SON Statement of Need
SOP Standard Operating Procedure
SOS Spacecraft/Observatory Simulator
SOW Statement of Work
SPI Schedule Performance Index
SPIM SPOT Image
SPITL Scheduling Period In The Life
SPL Software Project Lead
Service-Oriented Architecture (SOA) Proof of Concept or Security
SPOC Point of Contact
Satellite Pour l'Observation de la Terre (Satellite for Earth
SPOT Observation)
SPSR System Pre-Ship Review
SPVP System Performance Verification Plan
SQA Software Quality Assurance
SQAP Software Quality Assurance Plan
SQL Structured Query Language
SQMS Software Quality Management System
SQPSK Staggered Quadrature Phase Shift Keying
SQRT Square Root
SR System Review
sr steradian
SRD System Requirements Document
SRI Standard Robot Interface
SRM Silo Resource Manager
SRO Systems Review Office
System Readiness Review, System Requirements Review, or
SRR Software Requirements Review
Software Requirements Specification or System Requirements
SRS Specification
SRT Systems Review Team
Software Requirements Traceability Matrix or Shuttle Radar
SRTM Topography Mission
SS Space Segment or System Support
SSA S-Band Single Access
SSCL Standard System Control List
SSD Subsystem Design Document
SSH Secure Shell
SSIP System Safety Implementation Plan
SSoH Stored State of Health
SSP System Security Plan
SSPA Solid State Power Amplifier
SSPP Systems Safety Program Plan
SSR Solid State Recorder
ST System Test
STC System Test Case
STDEV Standard Deviation
STDN Spaceflight Tracking and Data Network
STE System Test Equipment
STESR System Test Execution Summary Report
STF System Transfer Function
STIG Security Technical Implementation Guide
STK StorageTek
STP System Test Plan
STR System Test Report
SUM Summary
SUN Sun Microsystems, Inc.
SV Space Vehicle, Schedule Variance, or Subversion
SVN Sun-Vehicle-Normal angle
SW Switch or Software
SWIR Short Wavelength Infrared
SWOT Strength, Weakness, Opportunity, and Threat
SZA Solar Zenith Angle
T Temperature
T&C Telemetry and Command
T/V Thermal/Vacuum
TAI International Atomic Time
TAP Technical Assessment Panel
TAR Tape Archiver
TAT Turn-Around-Time
TB Terabyte
TBC To Be Confirmed
TBD To Be Determined
TBR To Be Resolved, To Be Reviewed, or To Be Refined
TBS To Be Submitted, To Be Supplied , or To Be Specified
TC Test Case
TCDC Total Cloud Cover
TCP Transmission Control Protocol
TCP/IP Transmission Control Protocol/Internet Protocol
TCXO Temperature-Compensated Crystal Oscillator
TDF Tracking Data Formatter
TDI Time Delay Integration
TDR Test Discrepancy Report
TDRSS Tracking and Data Relay Satellite System
TE Test Engineer
TEM Technical Exchange Meeting
TERSS Tasmanian Earth Resources Satellite Station Consortium
tHC The Hammers Company
TID Total Ionizing Dose
TIFF Tagged Image File Format
TIM Technical Interchange Meeting
TIRS Thermal Infrared Sensor or Thermal Infrared Scanner
TLE Two-Line Element
TLM Telemetry
TM Thematic Mapper or Traverse Mercator
TM-A Thematic Mapper - Archive Format
Thematic Mapper and Multispectral Scanner Archive Conversion
TMACS System
TMIAS Thematic Mapper Image Assessment System
TML Total Mass Loss
TM-R Thematic Mapper - Raw Format
TNS Transport Network Substrate
TO Task Order
TOA Top of Atmosphere
TP Task Plan
TPL Telemetry Packetization Layer
TPM Technical Performance Measures
TQCM Thermoelectric Quartz Crystal Microbalanc
TRAM Tracking, Routing, and Metrics
TRD Technical Requirements Document
TRN Technical Redirection Notice
TRR Test Readiness Review
TSI Honeywell Technology Solutions Inc.
TSR Technical Service Request
TSSC Technical Support Services Contract
TT&C Telemetry, Tracking, and Control
TTF TIRS Test Facility
TTL Transistor-Transistor Logic
TTOR Transition To Operations Review
TURFTS TDRS Users RF Test Set
TWITL Total WRS-2 In The Life
TWM Task and Work Management
U/L Uplink
U/P Uplink Processor
UB Undistributed Budget
UDP Upper Data Point or User Datagram Protocol
UG Users Guide
uhd User's Home Directory
UI User Interface
UIS USGS Inventory Server
UL Upper Left
UML Unified Modeling Language
Bell Laboratories trademark for operating system language and time
UNIX sharing
unixODBC Unix Open Database Connectivity
UP User Portal Subsystem
UPE User Portal Element
UPS Uninterruptible Power Supply
UR Upper Right
URL Uniform Resource Locator
URP User Request Parameters
US United States
USC United States Code
USDA Department of Agriculture
USG U.S. Government
USGS U.S. Geological Survey
USNO U.S. Naval Observatory
USPS United States Postal Service
USSTRATCOM U.S. Strategic Command
UT Universal Time or Unit Test
UT1 UTC Corrected
UTC Universal Time Code or Coordinated Universal Time
UTM Universal Transverse Mercator
V&V Verification and Validation
VA Veteran Administration
VAC Variance at Completion
VAFB Vandenburg Air Force Base
VAP(s) Value Added Processor(s)
VAR Value-Added Resellers or Variance Analysis Report
VCA Virtual Channel Access
VCDU Virtual Channel Data Unit
VCID Virtual Channel Identifier
VCLC Virtual Channel Link Control
VDD Version Description Document
VDP Validation Data Products
VER Version
VF Valley Forge
VIIRS Visible Infrared Imager / Radiometer Suite
VisID Visual Identification
VLAN Virtual Local Area Network
VM Version Manager
VMS Virtual Memory Storage
VNIR Visible and Near Infrared
VOIP Voice Over Internet Protocol
VPN Virtual Private Network
VRM Verification Requirements Matrix
VRP Video Reference Pixel
VTL Verification Tracking Log
WAD Work Authorization Document
WAN Wide Area Network
WB Wideband
WBDR Wideband Downlink Report
WBM Wide-Band Module
WBS Work Breakdown Structure
WBV Wide Band Video
WBVT Wide Band Video Tape
WCS Web Coverage Services
WELD Web-Enabled Landsat Data
WFS Web Feature Services
WG Working Group
WGS World Geodetic System
WGS84 World Geodetic System 1984
WILMA Wide Long Term Multi-Satellite Archive
WIP Work In Progress
WMS Web Mapping Services
WORS Wallops Orbital Tracking Station
WOTIS Wallops Orbital Tracking Information Systems
WP Work Plan or Work Package
WPS Wallops Ground Station
WRS Worldwide Reference System
WRS-2 Worldwide Reference System-2
WSC White Sands Complex
WSDL Web Service Definition Language
WSGT White Sands (NASA) Ground Terminal
WVTCS Wideband Video Tape Conversion System
WWW World Wide Web
XML Extensible Markup Language
XS Multispectral SPOT sensor
XSD XML Schema Definition
XTX X-Band Transmitter
YGC Yaw Gyro Compassing
Z Zulu time (same as GMT)
ZB Zettabyte
ZFS Zettabyte File System