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Description

The Hawkeye instrument, flown onboard the SeaHawk CubeSat, was optimized to provide high quality, high resolution imagery (120 meter) of the open ocean, coastal zones, lakes, estuaries and land features. This ability provides a valuable complement to the lower resolution measurements from previous missions like SeaWiFS, MODIS and VIIRS. The SeaHawk CubeSat mission is a partnership between NASA and the University of North Carolina, Wilmington (UNCW), Cloudland Instruments and AAC-Clyde Space and is funded by the Moore Foundation under a grant for the Sustained Ocean Color Observations with Nanosatellites (SOCON).

Version Description

Reprocessing of Ocean Color (OC) Datasets

Product Summary

Platforms
SeaHawk-1
Instruments
HawkEye
Spatial Extent

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

Coordinate System
CARTESIAN
Granule Spatial Representation
GEODETIC
Temporal Extent
2019-03-21 to 2023-10-27
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
C3160685780-OB_CLOUD
Data State
COMPLETE
Number of Files/Granules
7728
Processing Level
2
Published
Updated
Science Keywords
Ocean Color ,
Reflectance ,
Aerosol Optical Depth/Thickness ,
Angstrom Exponent ,
Chlorophyll Concentration ,
Attenuation/Transmission ,
Organic Carbon ,
Fluorescence ,
Photosynthetically Active Radiation

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). SeaHawk-1 HawkEye Level-2 Regional Ocean Color (OC) Data, version 2022.0 [Data set]. NASA Ocean Biology Distributed Active Archive Center. https://doi.org/10.5067/SEAHAWK-1/HAWKEYE/L2/OC/2022.0 Date Accessed: 2026-01-18

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
geophysical_data/angstrom Aerosol Angstrom exponent, 443 to 865 nm N/A int16 -32767 -30000 to 5000 9.9999997473788E-5
geophysical_data/aot_867 Aerosol optical thickness at 867 nm N/A int16 -32767 0 to 30000 9.9999997473788E-5
geophysical_data/chlor_a Chlorophyll Concentration, OCI Algorithm mg m^-3 float32 -32767 0.0010000000474975 to 100 N/A
geophysical_data/Kd_490 Diffuse attenuation coefficient at 490 nm, KD2 algorithm m^-1 int16 -32767 50 to 30000 0.00019999999494758
geophysical_data/l2_flags Level-2 Processing Flags N/A int32 N/A -2147483648 to 2147483647 N/A
geophysical_data/pic Calcite Concentration, Balch and Gordon mol m^-3 int16 -32767 -32500 to 30000 1.9999999949505E-6
geophysical_data/poc Particulate Organic Carbon, D. Stramski, 2007 (443/555 version) mg m^-3 int16 -32767 -32000 to -27000 0.20000000298023
geophysical_data/Rrs_412 Remote sensing reflectance at 412 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6
geophysical_data/Rrs_447 Remote sensing reflectance at 447 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6
geophysical_data/Rrs_488 Remote sensing reflectance at 488 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6
geophysical_data/Rrs_510 Remote sensing reflectance at 510 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6
geophysical_data/Rrs_556 Remote sensing reflectance at 556 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6
geophysical_data/Rrs_670 Remote sensing reflectance at 670 nm sr^-1 int16 -32767 -30000 to 25000 1.9999999949505E-6
navigation_data/cntl_pt_cols navigation_data/cntl_pt_cols N/A int32 -32767 0 to 10000 N/A
navigation_data/cntl_pt_rows navigation_data/cntl_pt_rows N/A int32 -32767 0 to 10000 N/A
navigation_data/latitude Latitude degrees_north float32 -999 -90 to 90 N/A
navigation_data/longitude Longitude degrees_east float32 -999 -180 to 180 N/A
navigation_data/tilt Sensor tilt angle degree float32 -32767 -25 to 25 N/A
scan_line_attributes/clat Center Latitude degrees_north float32 -999 -90 to 90 N/A
scan_line_attributes/clon Center Longitude degrees_east float32 -999 -180 to 180 N/A
scan_line_attributes/csol_z Center Solar Zenith Angle degree float32 -999 -90 to 90 N/A
scan_line_attributes/day Scan day of year days int32 -32767 0 to 366 N/A
scan_line_attributes/detnum Detector Number (zero-based) N/A int8 -1 0 to 25 N/A
scan_line_attributes/elat Ending Latitude degrees_north float32 -999 -90 to 90 N/A
scan_line_attributes/elon Ending Longitude degrees_east float32 -999 -180 to 180 N/A
scan_line_attributes/msec Scan time, milliseconds of day milliseconds int32 -32767 0 to 86400000 N/A
scan_line_attributes/mside Mirror Side (zero-based) N/A int8 -1 0 to 1 N/A
scan_line_attributes/slat Starting Latitude degrees_north float32 -999 -90 to 90 N/A
scan_line_attributes/slon Starting Longitude degrees_east float32 -999 -180 to 180 N/A
scan_line_attributes/year Scan year years int32 -32767 1900 to 2100 N/A
sensor_band_parameters/aw Band-pass averaged absorption coefficient for seawater m^-1 float32 -32767 9.9999997473788E-5 to 5 N/A
sensor_band_parameters/bbw Band-pass averaged backscattering coefficient for seawater m^-1 float32 -32767 4.9999998736894E-6 to 1 N/A
sensor_band_parameters/F0 Mean Solar Flux W m^-2 um^-1 float32 -32767 0 to 250 N/A
sensor_band_parameters/k_no2 NO2 Absorption cross-sections cm^2 molecule^-1 float32 -32767 0 to 0.10000000149012 N/A
sensor_band_parameters/k_oz Ozone Absorption cross-sections cm^-1 float32 -32767 0 to 0.10000000149012 N/A
sensor_band_parameters/Tau_r Rayleigh Optical Thickness N/A float32 -32767 0 to 0.5 N/A
sensor_band_parameters/vcal_gain Vicarious Calibration Gain N/A float32 -32767 0 to 2 N/A
sensor_band_parameters/vcal_offset Vicarious Calibration Offset mW cm^-2 um^-1 sr^-1 float32 -32767 0 to 10 N/A
sensor_band_parameters/wavelength wavelengths nm int32 -32767 0 to 20000 N/A
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