N: 79.9 S: -80 E: 174.9 W: -175
Description
This dataset provides global gridded daily estimates of gross primary production (GPP) and uncertainties at 0.05 deg latitude by 0.05 deg longitude resolution for the period March 2000 to present. The GPP is derived from MODerate-resolution Imaging Spectroradiometer (MODIS) instruments on NASA Terra and Aqua satellites. GPP is derived using the MODIS Nadir Bidirectional Reflectance Distribution Function (BRDF)-Adjusted Reflectances (NBAR) product, which is used as input to neural network models to globally upscale GPP estimated from selected collocated FLUXNET 2015 and OneFlux eddy covariance tower sites used for model training. Version 2.2 is the current version of the dataset.
If you have any questions, please read the README document first and post your question to the NASA Earthdata Forum (forum.earthdata.nasa.gov) or email the GES DISC Help Desk (gsfc-dl-help-disc@mail.nasa.gov).
Product Summary
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.
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READ-ME
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 | Offset |
|---|---|---|---|---|---|---|---|
| BRDF_Quality | BRDF_Quality | 1 | float32 | -1 | N/A | N/A | N/A |
| crs | crs | 1 | float64 | -9999 | N/A | N/A | N/A |
| FPAR_LUE_constitutive | FPAR_LUE_constitutive | 1 | float32 | -9999 | N/A | N/A | N/A |
| GPP | GPP | g m-2 d-1 | float32 | -9999 | N/A | N/A | N/A |
| GPP_uncertainty | GPP_uncertainty | g m-2 d-1 | float32 | -9999 | N/A | N/A | N/A |
| lat | lat | degrees_north | float32 | -9999 | N/A | N/A | N/A |
| lon | lon | degrees_east | float32 | -9999 | N/A | N/A | N/A |
| Percent_Inputs | Percent_Inputs | 1 | float32 | -1 | N/A | N/A | N/A |
| time | midday time | days since 2000-01-01 00:00:00 | float64 | -9999 | N/A | N/A | N/A |
| time_bnds | start and end time for each time slice | N/A | float64 | -9999 | N/A | N/A | N/A |