Combined ASTER and MODIS Emissivity database over Land (CAMEL) first Principal Components Analysis (PCA) coefficient data from the CAM5K30CF product over the globe from the month of January 2021.
View full-size imageThe 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) dataset provides monthly coefficients at 0.05 degree (~5 kilometer) resolution (CAM5K30CF). The CAMEL Principal Components Analysis (PCA) input coefficients utilized in the CAMEL high spectral resolution (HSR) algorithm are provided in the CAM5K30CF data product and are congruent to the temporally equivalent CAM5K30EM emissivity data product. Additional details regarding the methodology are available in the User Guide and Algorithm Theoretical Basis Document (ATBD).
Provided in the CAM5K30CF product are layers for PCA coefficients, number of PCA coefficients, laboratory version, snow fraction derived from MODIS Snow Cover data (MOD10), latitude, longitude, and the CAMEL quality information. PCA coefficients are dependent on the version of lab Principal Component (PC) data and the number of PCs used.
Version 3 includes new MODIS Terra and Aqua Land Surface Temperature and 3-Band Emissivity (MYD/MOD21) input data in the University of Wisconsin-Madison MODIS Baseline Fit (UWBF) emissivity database and the latest 6.1 version of MODIS Terra and Aqua Land Surface Temperature and Emissivity (MYD/MOD11) and MYD/MOD21 products with the most up-to-date calibration corrections. Additional information on the Version 3 updates is provided in Section 2 of the User Guide and ATBD.
| Characteristic | Description |
|---|---|
| Collection | MEaSUREs LSTE |
| DOI | 10.5067/MEaSUREs/LSTE/CAM5K30CF.003 |
| File Size | ~130 MB |
| Temporal Resolution | Monthly |
| Temporal Extent | 2000-03-01 to 2022-01-01 |
| Spatial Extent | Global |
| Coordinate System | Geographic Latitude and Longitude |
| Datum | World Geodetic System (WGS84) |
| File Format | netCDF-4 |
| Geographic Dimensions | 90° x 180° |
| Characteristic | Description |
|---|---|
| Number of Science Dataset (SDS) Layers | 7 |
| Columns/Rows | 3600 x 7200 |
| Pixel Size | 5600 m |
| SDS Name | Description | Units | Data Type | Fill Value | No Data Value | Valid Range | Scale Factor |
|---|---|---|---|---|---|---|---|
| pc_coefs | PCA coefficients | N/A | 32-bit floating point | -999 | N/A | -10 to 10 | N/A |
| pc_npcs | Number of PCs used | N/A | 16-bit signed integer | N/A | N/A | 2 to 9 | N/A |
| pc_labvs | Version number of the PC scores data file | N/A | 16-bit signed integer | N/A | N/A | 8 to 12 | N/A |
| latitude | Latitude | Degree | 32-bit floating point | N/A | N/A | -90 to 90 | N/A |
| longitude | Longitude | Degree | 32-bit floating point | N/A | N/A | -180 to 180 | N/A |
| snow_fraction | Snow fraction derived from MOD10 | N/A | 16-bit signed integer | N/A | N/A | 0 to 100 | 0.01 |
| camel_qflag | CAMEL quality flag | N/A | 16-bit signed integer | N/A | N/A | 0 to 4 | N/A |
| Value | Description |
|---|---|
| 0 | Sea or inland water |
| 1 | Good quality of UWBF and ASTER GED data |
| 2 | Good quality of UWBF and filled ASTER GED data |
| 3 | Good quality of ASTER GED and filled UWBF data |
| 4 | Filled values used for both UWBF and ASTER GED data |
Additional quality flag information is provided in Section 2 of the User Guide and ATBD.
The following granules are missing from the product: January, February, and August of 2000; June and July of 2001; March of 2002; December of 2003; July of 2010; and February of 2016.