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Description

On August 17, 1996, the Japanese Space Agency (NASDA - National Space Development Agency) launched the Advanced Earth Observing Satellite (ADEOS). ADEOS was in a descending, Sun synchronous orbit with a nominal equatorial crossing time of 10:30 a.m. Amoung the instruments carried aboard the ADEOS spacecraft was the Ocean Color and Temperature Scanner (OCTS). OCTS is an optical radiometer with 12 bands covering the visible, near infrared and thermal infrared regions. (Eight of the bands are in the VIS/NIR. These are the only bands calibrated and processed by the OBPG) OCTS has a swath width of approximately 1400 km, and a nominal nadir resolution of 700 m. The instrument operated at three tilt states (20 degrees aft, nadir and 20 degrees fore), similar to SeaWiFS.

Version Description

Data format was updated from HDF5 to netCDF4.

Product Summary

Platforms
ADEOS-I
Instruments
OCTS
Spatial Extent

N: 90 S: -90 E: 180 W: -180

Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
1996-10-31 to 1997-06-30
Data Partner
Ocean Biology Processing Group (OBPG) ,
Ocean Biology Distributed Active Archive Center (OB.DAAC), Global Change Data Center, Earth Sciences Division, Science and Exploration Directorate, Goddard Space Flight Center, NASA (NASA/GSFC/SED/ESD/GCDC/OB.DAAC)
Concept ID
C3300834679-OB_CLOUD
Data State
COMPLETE
Number of Files/Granules
7641
Processing Level
1
Published
Updated
Science Keywords
Ocean Color

Citation

Citation is critically important for dataset documentation and discovery. This dataset is openly shared, without restriction, in accordance with the EOSDIS Data Use and Citation Guidance.

Copy Citation

NASA Ocean Biology Processing Group. (2024). ADEOS-I OCTS Level-1A Data, version 2 [Data set]. NASA Ocean Biology Distributed Active Archive Center. https://doi.org/10.5067/ADEOS-I/OCTS/L1A/DATA/2 Date Accessed: 2026-01-25

Documents

Variables

Variables are a set of physical properties whose values determine the characteristics or behavior of something. For example, temperature and pressure are variables of the atmosphere. Parameters and variables can be used interchangeably. Variable level attributes provide individual information for each variable.

The Name in this table is the variable name. Fill value indicates missing or undefined data points in a variable. Valid range is the range of values the variable can store. Scale factor is used to increase or decrease the size of an object and can be used to correct for distortion. For questions on a specific variable, please use the Earthdata Forum.

Name Description Units Data Type Fill Value Valid Range Scale Factor
amux_v Analog multiplexer voltage voltages float32 -32767 N/A N/A
att_ang Computed roll, pitch, yaw degrees float32 -32767 N/A N/A
bb_temp Black body temperature telemetry degrees float32 -32767 N/A N/A
beta_ad Temperature correction coefficients beta ad kelvin^-1 float32 -32767 N/A N/A
beta_am Temperature correction coefficients beta am kelvin^-1 float32 -32767 N/A N/A
beta_d Temperature correction coefficients beta d kelvin^-1 float32 -32767 N/A N/A
beta_oad Temperature correction coefficients beta Oad kelvin^-1 float32 -32767 N/A N/A
beta_oam Temperature correction coefficients beta Oam kelvin^-1 float32 -32767 N/A N/A
beta_p Temperature correction coefficients beta p kelvin^-1 float32 -32767 N/A N/A
blk_data Black body data N/A uint16 65535 N/A N/A
const_i Constant current calibration signal voltages float32 -32767 N/A N/A
det Detector number of pixels N/A int16 -32768 N/A N/A
dsp_sys DSP system N/A uint16 65535 N/A N/A
end_time End time of time difference data N/A N/A 0 N/A N/A
eng_qual Engineering data-out-of-range flags N/A uint8 255 N/A N/A
eta Reflecting ratio correction coefficients N/A float32 -32767 N/A N/A
evpxl End valid pixel N/A int16 -32768 N/A N/A
gain Band gain settings N/A uint16 65535 N/A N/A
inst_temp Instrument temperature telemetry degrees float32 -32767 N/A N/A
interval Data interval time seconds float64 -32767 N/A N/A
l1a_data Level-1A data N/A uint16 65535 N/A N/A
lat Scan point latitude N/A float32 -32767 N/A N/A
lon Scan point longitude N/A float32 -32767 N/A N/A
mirror_e Scan mirror mounting error sec float32 -32767 N/A N/A
miss_qual Missing frame flag N/A uint16 65535 N/A N/A
msec Scan-line time, milliseconds of day milliseconds int32 -32768 N/A N/A
num_inf Number of time difference data N/A int16 -32768 N/A N/A
num_points Number of data points N/A int32 -32768 N/A N/A
num_rec Number of records N/A int32 -32768 N/A N/A
num_tables Number of subsampling tables N/A int16 -32768 N/A N/A
octs_tlm OCTS instrument telemetry N/A uint16 65535 N/A N/A
off_time Offset time of scan N/A uint16 65535 N/A N/A
opr_mode Operation mode N/A uint16 65535 N/A N/A
opt_a Alignment matrix of OPT coordinates N/A float32 -32767 N/A N/A
opt_vec View vector at optical unit N/A float32 -32767 N/A N/A
orbit_count Orbit accumulation number N/A int32 -32768 N/A N/A
orb_vec Orbit position vector at scan line time in ECR kilometers float32 -32767 N/A N/A
orb_vel Orbit velocity at scan line time in ECR kilometers second^-1 float32 -32767 N/A N/A
period_count Counter period of SC clock N/A N/A 0 N/A N/A
polar_motion Polar motion parameters N/A float64 -32767 N/A N/A
pre Prefix data N/A uint8 255 N/A N/A
precision Orbit data precision N/A int16 -32768 N/A N/A
pxl Column direction address of pixels N/A int16 -32768 N/A N/A
rad_coef Radiometric correction coefficients N/A float32 -32767 N/A N/A
rad_tbl Radiometric correction table N/A float32 -32767 N/A N/A
rad_tbl_size Radiometric correction table size N/A int16 -32768 N/A N/A
ref_count Reference counter of SC clock N/A N/A 0 N/A N/A
ref_temp Reference temperature for temperature correction coefficients celsius float32 -32767 N/A N/A
ref_time Reference time(UT) of ground N/A N/A 0 N/A N/A
samp_table Subsampling table N/A int16 -32768 N/A N/A
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