N: 90 S: -90 E: 180 W: -180
Description
The NASA Making Earth System Data Records for Use in Research Environments (MEaSUREs) Combined Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) and Moderate Resolution Imaging Spectroradiometer (MODIS) Emissivity for Land (CAMEL) data suite has been expanded to include a monthly global covariances climatology product (CAM5K30COVCLIM). The product is provided at 0.25 degree (~25 kilometer) resolution. The CAMEL covariance product includes the mean and variance of the covariance matrixes created for each month from 2003 through 2021 (19 years) on a 0.25 x 0.25 degree grid of 416 spectral points from the V003 CAMEL Emissivity product (CAM5K30EM). Additional details regarding the methodology are available in the User Guide and Algorithm Theoretical Basis Document (ATBD).
Provided in the CAM5K30COVCLIM product are variables for the mean and variance of the emissivity, latitude, longitude, spectral frequencies, and number of observations.
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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File Naming Convention
The file name begins with the Product Short Name (CAM5K30COVCLIM) followed by climatology package component (hsremis_covmat), Spatial Resolution (deg0.25), the Temporal Coverage designated as YYYY-yyyy (2003-2021), the Month designated as mmMonth (01Month), the Data Collection Version (V003), Dimension Element (mask), and the Data Format (nc).
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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 |
|---|---|---|---|---|---|---|
| Emis_diagCov | Diagonal of the covariance matrix for each grid cell over the time period | N/A | int16 | -999 | 0 to 1 | 1.0E-6 |
| emis_mean | Mean of the emissivity in the grid cell over the time period | N/A | int16 | -999 | -10 to 10 | 0.001 |
| emis_numObs | Number of Observations | N/A | int16 | N/A | 0 to 475 | N/A |
| frequencies | Frequency numbers of the measurements | N/A | int16 | N/A | 6980 to 27780 | 0.1 |
| latitude | Latitude, degrees North at grid-box center | Degree | int16 | N/A | -90 to 90 | N/A |
| longitude | Longitude, degrees East at grid-box center | Degree | int16 | N/A | -180 to 180 | N/A |