a0: Temperature-dependent offset for TEB calibration
a2: Temperature-dependent quadratic coefficient for TEB calibration
AM-1: Ante Meridian EOS Platform (Terra; orbit crosses equator ~10:30 am)
AOI: Angle of incidence
AQUA: FM1 satellite that houses MODIS; http://eos-pm.gsfc.nasa.gov/
ATBD: Algorithm Theoretical Basis Document
b1: Linear gain term (TEB)
BB: BlackBody
BBR: Band-to-band registration
BCS: Blackbody Calibration Source (on ground, 270 – 315K)
BDSM: Band, Detector, Subframe (sample), Mirror side
BRDF: Bi-directional Reflectance Distribution Function
BRF: Bi-directional Reflectance Factor
BW: Bandwidth
CFPA: Cold Focal Plane Assembly
Channel: each detector element
CW: Center Wavelength
DB: Direct Broadcast
DC: Digital Count
DCR: Direct Current Restore
DN: Digital Number; "Big DN". Raw signal recorded by MODIS, including SV with DCR
dn: DN corrected for electronic background (i.e., DN-SV); called "little dn"
dn*: DN corrected for instrument effects (temp., MS, RVS), SV signal subtracted; called "dn star"
dn**: For RSBs, dn* as scaled to the scaled integer (SI) within a defined dynamic range so that a single set of calibration parameters applies for every detector in a band
dn_sat: dn value at which the detector saturates
DQF: Data Quality Flags. Content of the QA LUT that describes detector status.
Ecal: Electronics calibration (detectors omitted from circuit)
EOS: Earth Observing System
Esun: RSR-weighted solar irradiance
EV: Earth View
Fire Band: MODIS Bands 21, 31, 32
FM1: Aqua satellite; Flight Model-1 (orbit crosses equator in pm)
FOS: Flight Operations Segment
FOV: Field of View
FPA: Focal Plane Assembly
FR: Formatter (component of MODIS instrument)
Frame: 1-km along scan or the length of time that the mirror scans a 1-km pixel
Frame #: 1 to 1354. Linearly related to scan angle. A cross-track (along scan) pixel.
FWHM: Full Width Half Maximum
FOT: Flight Operations Team
GIFOV: Geometric instantaneous field of view
GMT: Greenwich Mean Time (also UTC - Universal Time Coordinates, also annotated with a z for zulu)
Granule: Five minutes (a data processing time unit)
GSFC: Goddard Space Flight Center
HDF: Hierarchical Data Format
I&T: Integration and Test
IDL: Interactive Data Language
IFOV: Instantaneous Field ofView
IOT: Instrument Operations Team
IR: Infrared
ITWK: Focal plane current (I) adjustment
JPSS: Joint Polar Satellite System
K_inst: Instrument Temperature dependence coefficients
L: MODIS Radiance
L1A: Level 1A- Code (same as MOD_PR01) that unpacks the Level 0 data and reformats it into an HDF file and generates granule files
L1B: Level 1B- Code (same as MOD_PR02) that ingests L1A output and geolocation to produce radiances and reflectances
Lsat: Saturation radiance
LUT: Look-Up Table. A value or array input to the L1B code, resides in the Emissive LUT file, the Reflective LUT file, or the QA LUT file.
LWIR: Long-Wavelength InfraRed, MODIS Bands 27-36
L1B: Level 1B: calibrated, geo-located data
LSF: Line Spread Function
m1: Reflectance Calibration Linear Term (inversely proportional to detector response)
MCF: Metadata Configuration Files, e.g., identifies the satellite.
MCST: MODIS Characterization Support Team
MOD…: Indicates Terra product
MODAPS: MODIS Adaptive Processing System
MODARCH: MODIS Document Archive
MODIS: MODerate-resolution Imaging Spectroradiometer
MRCN: Mirror Rotation Correlated Noise (diff. and ratios between mirror sides)
MS1,MS2: Mirror side 1; Mirror side 2
MSCN: Mirror-side Correlated Noise
MsWG: MODIS sensor Working Group
MTF: Modulation Transfer Function (spatial response of non-uniform scenes)
MWIR: Mid-Wavelength InfraRed, MODIS bands 20-25
MYD…: Indicates Aqua product
NAD: Nadir Aperture Door
NEdL: Noise Equivalent delta Radiance (L)
NIR: Near InfraRed, MODIS bands 1, 2, 13-19
NPOESS: National Polar-Orbiting Operational Environmental Satellite System
NPP: NPOESS Preparatory Project
NTDM: Night-time-day mode
OA: Operational Activity
OBC: On-Board Calibrator (SD/SDSM, SRCA, BB, or SV)
OO: On-orbit
OOB: Out of Band
OOF: Out of Family; refers to a detector with unusual characteristics in the band.
PC: Photo-Conductive (detectors used for MODIS bands 31-36)
PCF: Process Control File (contains names of the MCFs; specifies inputs to L1B)
PFM: Proto Flight Model (Terra/MODIS)
PGE: Product Generation Executive (e.g., L1B = PGE02)
PGS: Product Generation System
PIQM: Processing and Instrument Quality Metadatabase
PM-1: Post Meridian EOS Platform (Aqua; orbit crosses equator ~1:30 pm)
Product order: Detector numbering convention used by the L1B code. It is the inverse of SBRS order
PV: Photo-Voltaic (detectors used for MODIS bands 1-30)
QA: Quality Assurance
QC: Quality Control
Radiance: Watts/m2/um/steradian. Depends on distance (inverse square law).
RC: Radiometric Calibration
Reflectance : rho(EV)*cos(Theta). Reflectance is the primary MODIS product. As a property of what we are viewing, it is independent of distance.
RSB: Reflective Solar Band (MODIS bands 1-19, 26, including high and low gains for bands 13 and 14)
RSR: Relative Spectral Response
R_star: Radiance Gain (linear response) Factor = Pi/(m1*Esun)
RVS: Response Vs. Scan angle
SBRS: Detector numbering convention used by Santa Barbara Research System
S/C: Spacecraft
Scan: 1.4771-second crosstrack sweep of the Earth; 1 mirror side per scan; approximately 203 scans per granule
ScMA: Scattering Measurement Assembly
SD: Solar Diffuser (screen "down" = unscreened SD)
SDD: Solar Diffuser Door
SDS: Scientific Data Set (multi-dimensional array in HDF files); alternatively Solar Diffuser Screen
SDSM: Solar Diffuser Stability Monitor (a ratioing radiometer)
SDST: Science Data Support Team
SI: Scaled Integer
SiPD: Silicon Photo Diode
SIS: Spherical Integrating Source
SMA: Scan Mirror Assembly
SMIR: Short- plus mid-wave infrared
SNR: Signal to Noise Ratio
SpMA: Spectral Measurement Assembly (TV)
SRCA: Spectro-Radiometric Calibration Assembly
SRF: Spectral Response Function
SSR: Solid State Recorder
STM: Science Team Meeting
SWIR: Short-wave infrared
Subframe: < 1km (applies to bands with better than 1 km spatial resolution)
SV: Space View
SVP: Space View Port
SWIR: Short-Wavelength InfraRed, MODIS bands 5, 6, 7, 26.
TDI: Time-Delay Integration
TEB: Thermal Emission Bands (MODIS bands 20-25, 27-36)
TERRA: PFM satellite that houses MODIS
TLM/TM: Telemetry
TMON: Telemetry Monitoring
TOA: Top of the Atmosphere
TV: Thermal Vacuum (a pre-launch test environment)
UAID: Unique Acquisition Identifier (data files)
UI: Uncertainty Index
UTC: Universal Time Coordinates (also GMT or z)
Vdet: Detector Voltage
VIS: Visible (MODIS bands 3, 4, 8-12)
VIIRS: Visible/Infrared Imager Radiometer Suite
WUCD: Warmup Cooldown
X_OOB: OOB Response Reciprocal Gain Factor
XT: Crosstalk