MODOCGA v006

MODIS/Terra Ocean Reflectance Daily L2G-Lite Global 1 km SIN Grid


PI: Eric Vermote

Description

The MODOCGA Version 6 Level 2 Gridded Lite (L2G-lite) Ocean Reflectance product provides an estimate of the surface spectral reflectance data from Terra Moderate Resolution Imaging Spectroradiometer (MODIS) bands 8 through 16. Data have been corrected for atmospheric conditions such as gasses, aerosols, and Rayleigh scattering. MODOCGA is a daily land product with a pixel size of 1 kilometer (km). The product is referred to as ocean reflectance because bands 8 through 16 are used primarily to produce ocean products. The MODOCGA, as with other L2G data sets, stores the “best available pixel” from all the qualifying observations in the first layer and any subsequent observations are stored in either a full or compact format layer within the Hierarchical Data Format (HDF) file.

Characteristics

Improvements/Changes from Previous Versions

  • New product for MODIS Version 6.

Product Maturity

The MODOCGA data product is categorized with the Surface Reflectance products and has therefore attained stage 3 validation.

Collection and Granule

Collection

Characteristic Description
CollectionTerra MODIS
DOI10.5067/MODIS/MODOCGA.006
File Size26 MB
Temporal ResolutionDaily
Temporal Extent2000-02-24 to Present
Spatial ExtentGlobal
Coordinate SystemSinusoidal
DatumN/A
File FormatHDF-EOS
Geographic Dimensions~1200 km x 1200 km

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers14
Columns/Rows1200 x 1200
Pixel Size~1000 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor Additional Offset
num_observations Number of observations per pixel N/A 8-bit signed integer -1 N/A 0 to 127 N/A N/A
sur_refl_b08_1 Surface Reflectance Band 8 (405-420 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001 N/A
sur_refl_b09_1 Surface Reflectance Band 9 (438-448 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001 N/A
sur_refl_b10_1 Surface Reflectance Band 10 (483-493 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001 N/A
sur_refl_b11_1 Surface Reflectance Band 11 (526-536 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001 N/A
sur_refl_b12_1 Surface Reflectance Band 12 (546-556 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001 N/A
sur_refl_b13_1 Surface Reflectance Band 13 (662-672 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001 N/A
sur_refl_b14_1 Surface Reflectance Band 14 (673-683 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001 N/A
sur_refl_b15_1 Surface Reflectance Band 15 (743-753 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001 N/A
sur_refl_b16_1 Surface Reflectance Band 16 (862-877 nm) N/A 16-bit signed integer -28672 N/A -100 to 16000 0.0001 N/A
QC_b8_15_1km_1 Band Quality Bands 8-15 Bit Field 32-bit unsigned integer 787410671 N/A 0  to 4294966019 N/A N/A
QC_b16_1km_1 Band Quality Band 16 Bit Field 8-bit unsigned integer 3 N/A 0 to 255 N/A N/A
orbit_pnt_1 Orbit Pointer N/A 8-bit signed integer -1 N/A 0 to 15 N/A N/A
granule_pnt_1 Granule Pointer N/A 8-bit unsigned integer 255 N/A 0 to 254 N/A N/A

Footnote for the Number of Science Dataset (SDS) Layers in drupal - *If the "L2GStorageFormat" metadata value is "full" additional data layers will be present with the suffix “_f”. If the "L2GStorageFormat" metadata value is "compact" additional data layers will be present with the suffix “_c”.

Product Quality

The quality layers are stored in an efficient bit-encoded manner. The unpack_sds_bits executable from the LDOPE Tools is available to the user community to help parse and interpret the QC layer.

In addition to data access and transformation processes, AppEEARS also has the capability to unpack and interpret the quality layer.

The quality bit flags for the QC_b8_15_1km_1 and QC_b16_1km_1 layers are provided in the MODOCGA MODIS V006 File Specs.

Known Issues

MODOCGA does not have a specific Known Issues page. Pleae see the general Terra Known Issues page for further details.

Documentation

Using the Data

Tools

Citation

DOI: 10.5067/MODIS/MODOCGA.006

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