CAM5K30EM v002

Combined ASTER and MODIS Emissivity for Land (CAMEL) Emissivity Monthly Global 0.05 Deg


PI: Simon Hook

Description

The NASA Making Earth System Data Records for Use in Research Environments (MEaSUREs) Combined ASTER and 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 Infrared Emissivity dataset (UWIREMIS) 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 University of Wisconsin-Madison MODIS Baseline Fit (UWBF) 5 kilometer resolution, merging of the 5 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 Best Fit Emissivity (BFE) quality information.

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Characteristics

Improvements/Changes from Previous Versions

  • Version 2 includes two additional laboratory datasets to more accurately characterize snowy scenes.

Collection and Granule

Collection

Characteristic Description
CollectionMEaSUREs LSTE
DOI10.5067/MEaSUREs/LSTE/CAM5K30EM.002
File Size~54 MB
Temporal ResolutionMonthly
Temporal Extent2000-04-01 to 2016-12-31
Spatial ExtentGlobal
Coordinate SystemGeographic Latitude and Longitude
DatumWorld Geodetic System (WGS84)
File FormatNetCDF4
Geographic Dimensions90° x 180°

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers8
Columns/Rows3600 x 7200
Pixel Size5600 m

Layers

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 N/A 0 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

CAMEL Quality Flag Values

Value Description
0 Sea or inland water
1 Good quality of Baseline Fit and ASTER GED data
2 Good quality of Baseline Fit and filled ASTER GED data
3 Good quality of ASTER GED and filled Baseline Fit data
4 Filled values used for both Baseline Fit and ASTER GED data

ASTER GED Quality Flag Values

Value Description
0 No data
1 Good quality of ASTER GED data
2 Sea or inland water
3 Fill value

BFE Quality Flag Values

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 < -8 degree

Product Quality

Additional quality flag information is provided in the User Guide and ATBD.

Known Issues

No known issues.

Documentation

Using the Data

Tools

Citation

DOI: 10.5067/MEaSUREs/LSTE/CAM5K30EM.002

About the Image

Combined ASTER and MODIS Emissivity for Land (CAMEL) emissivity data from the CAM5K30EM product over the globe from the month of January 2012.

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