Combined ASTER and MODIS Emissivity database over Land (CAMEL) emissivity data at 8.6 micrometer from the CAM5K30EM 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 emissivity at 0.05 degree (~5 kilometer) resolution (CAM5K30EM). The CAM5K30EM data product was created by combining the University of Wisconsin-Madison MODIS Baseline Fit (UWBF) emissivity database and the Jet Propulsion Laboratory ASTER Global Emissivity Dataset Version 4 (GED V4). The two datasets have been integrated to capitalize on the unique strengths of each product's characteristics.
The integration steps include adjustment of ASTER GED Version 3 emissivities for vegetation and snow cover variations to produce ASTER GED Version 4, aggregation of ASTER GED Version 4 emissivities from 100 meter resolution to the UWBF 5 kilometer resolution, merging of the five ASTER spectral emissivities with the UWBF emissivity to create CAMEL at 13 hinge points, and extension of the 13 hinge points to high spectral resolution (HSR) utilizing the Principal Component (PC) regression method. Additional details regarding the methodology are available in the User Guide and Algorithm Theoretical Basis Document (ATBD).
Provided in the CAM5K30EM product are layers for the CAMEL emissivity, ASTER Normalized Difference Vegetation Index (NDVI), snow fraction derived from MODIS (MOD10), latitude, longitude, CAMEL quality, ASTER quality, and the UWBF emissivity quality information.
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/CAM5K30EM.003 |
| File Size | ~55 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 | NetCDF4 |
| Geographic Dimensions | 90° x 180° |
| Characteristic | Description |
|---|---|
| Number of Science Dataset (SDS) Layers | 8 |
| Columns/Rows | 3600 x 7200 |
| Pixel Size | 5600 m |
| SDS Name | Description | Units | Data Type | Fill Value | No Data Value | Valid Range | Scale Factor |
|---|---|---|---|---|---|---|---|
| camel_emis | CAMEL emissivity at 13 different spectra | N/A | 16-bit signed integer | -999 | N/A | 0 to 1000 | 0.001 |
| aster_ndvi | ASTER GED NDVI vegetation fraction | N/A | 16-bit signed integer | N/A | N/A | 0 to 1000 | 0.001 |
| Snow_fraction | Snow fraction derived from MOD10 | N/A | 16-bit signed integer | N/A | N/A | 0 to 100 | 0.01 |
| 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 |
| camel_qflag | CAMEL quality flag | N/A | 16-bit signed integer | N/A | N/A | 0 to 4 | N/A |
| aster_qflag | ASTER GED quality flag | N/A | 16-bit signed integer | N/A | 0 | 1 to 3 | N/A |
| bfemis_qflag | Baseline Fit Emissivity (BFE) 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 |
| Value | Description |
|---|---|
| 0 | No data |
| 1 | Good quality of ASTER GED data |
| 2 | Sea or inland water |
| 3 | Fill value |
| Value | Description |
|---|---|
| 0 | No MOD11 land surface temperature data |
| 1 | Baseline fit method was applied |
| 2 | Averaged from the two adjacent months |
| 3 | 2003 annual average |
| 4 | Average over annual average of all emissivity with latitude < -80 degree |
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.