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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.

Version Description

This is version two of the Combined ASTER and MODIS Emissivity database over Land products.

Product Summary

Platforms
Terra,
Aqua
Instruments
ASTER,
MODIS
Spatial Extent
N: 90 S: -90 E: 180 W: -180
Spatial Resolution
25000 Meters x 25000 Meters
Geographic Region
GLOBAL
Coordinate System
CARTESIAN
Granule Spatial Representation
CARTESIAN
Temporal Extent
2003-01-01 to 2022-01-01
Temporal Resolution
1 Month
Data Partner
Land Processes Distributed Active Archive Center (LP DAAC)
Cooperative Institute for Meteorological Satellite Studies, Space Science and Engineering Center, University of Wisconsin, Madison (UWI-MAD/SSEC/CIMSS)
Concept ID
C3274450252-LPCLOUD
Data State
COMPLETE
Processing Level
3
Published
Updated
Science Keywords
Emissivity,
Vegetation Index,
Snow Cover

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

Borbas, E., Hook, S., Hulley, G., Loveless, M., Knuteson, R., & Cawse-Nicholson, K. (2024). Combined ASTER and MODIS Emissivity database over Land (CAMEL) Covariances Climatology Monthly Global 0.25Deg V003 [Data set]. NASA Land Processes Distributed Active Archive Center. https://doi.org/10.5067/MEASURES/LSTE/CAM5K30COVCLIM.003 Date Accessed: 2025-11-02

File Naming Convention

CAM5K30COVCLIM_hsremis_covmat_deg0.25_2003-2021_01Month_V003_mask.nc

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).

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
Emis_diagCov Diagonal of the covariance matrix for each grid cell over the time period N/A int16 -999 -999 to 1 1.0E-6
emis_mean Mean of the emissivity in the grid cell over the time period N/A int16 -999 -999 to 10 0.001
emis_numObs Number of Observations N/A int16 N/A N/A to 475 N/A
frequencies Frequency numbers of the measurements N/A int16 N/A N/A to 27780 0.1
latitude Latitude, degrees North at grid-box center Degree int16 N/A N/A to 90 N/A
longitude Longitude, degrees East at grid-box center Degree int16 N/A N/A to 180 N/A
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