N: 90 S: -90 E: 180 W: -180
Description
MERIS (Medium Resolution Imaging Spectrometer) is a programmable, medium-spectral resolution, imaging spectrometer operating in the solar reflective spectral range. Fifteen spectral bands can be selected by ground command. The instrument scans the Earth's surface by the so called 'push-broom' method. Linear CCD arrays provide spatial sampling in the across-track direction, while the satellite's motion provides scanning in the along-track direction. MERIS is designed so that it can acquire data over the Earth whenever illumination conditions are suitable. The instrument's 68.5-degree field-of-view around nadir covers a swath width of 1150 km. This wide field of view is shared between five identical optical modules arranged in a fan shape configuration.
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Citation
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ALGORITHM THEORETICAL BASIS DOCUMENT (ATBD)
PROCESSING HISTORY
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Variables
The table below lists the variables contained within a single granule for this dataset. Variables often contain observed or derived geophysical measurements collected from a variety of sources, including remote sensing instruments on satellite and airborne platforms, field campaigns, in situ measurements, and model outputs. The terms variable, parameter, scientific data set, layer, and band have been used across NASA’s Earth science disciplines; however, variable is the designated nomenclature in NASA’s Common Metadata Repository (CMR). Variable metadata attributes such as Name, Description, Units, Data Type, Fill Value, Valid Range, and Scale Factor allow users to efficiently process and analyze the data. The full range of attributes may not be applicable to all variables. Additional information on variable attributes is typically available in the data, user guide, and/or other product documentation.
For questions on a specific variable, please use the Earthdata Forum.
| Name Sort descending | 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_865 | Aerosol optical thickness at 865 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/chl_ocx | geophysical_data/chl_ocx | 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/par | Photosynthetically Available Radiation, R. Frouin | mol m^-2 day^-1 | int16 | -32767 | -32750 to 32250 | 0.0020000000949949 |
| 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_413 | Remote sensing reflectance at 413 nm | sr^-1 | int16 | -32767 | -30000 to 25000 | 1.9999999949505E-6 |
| geophysical_data/Rrs_443 | Remote sensing reflectance at 443 nm | sr^-1 | int16 | -32767 | -30000 to 25000 | 1.9999999949505E-6 |
| geophysical_data/Rrs_490 | Remote sensing reflectance at 490 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_560 | Remote sensing reflectance at 560 nm | sr^-1 | int16 | -32767 | -30000 to 25000 | 1.9999999949505E-6 |
| geophysical_data/Rrs_620 | Remote sensing reflectance at 620 nm | sr^-1 | int16 | -32767 | -30000 to 25000 | 1.9999999949505E-6 |
| geophysical_data/Rrs_665 | Remote sensing reflectance at 665 nm | sr^-1 | int16 | -32767 | -30000 to 25000 | 1.9999999949505E-6 |
| geophysical_data/Rrs_681 | Remote sensing reflectance at 681 nm | sr^-1 | int16 | -32767 | -30000 to 25000 | 1.9999999949505E-6 |
| geophysical_data/Rrs_709 | Remote sensing reflectance at 709 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/time | scan line time in seconds since 1970-1-1 | seconds since 1970-1-1 | float64 | -32767 | N/A | 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 |