North American ASTER Land Surface Emissivity DatabaseEntry ID: naalsed
Abstract: The North American Advanced Spaceborne Thermal Emission and Reflection radiometer (ASTER) Land Surface Emissivity Database (NAALSED) covers the continent with 3,327 1 degree (°) x 1° tiles of 100-meter (m) resolution data. The data are placed in geographic coordinates (latitude, longitude) and distributed as Hierarchical Data Format Version 5 (HDF5) files.
Each NAALSED product contains several ... layers of related data such as Emissivity, Temperature, and a top of atmosphere Normalized Difference Vegetation Index (NDVI). Additional supporting layers include a regional version of the ASTER Global Digital Elevation Model (GDEM) V001 resampled to 100-m, a land water map, pixel geographic coordinates, and the number of observations used as input. The NAALSED parameters are averaged for every clear-sky pixel available in the ASTER mission record from 2000 through 2010. A New ASTER Cloud Mask Algorithm (NACMA) 2 was developed specifically to identify inputs to the ASTER Land Surface Emissivity Aggregation Algorithm (ALSEA) 1 that generates the parameter means and standard deviations in each tile. A full description of the methodology used to generate NAALSED is written in the references below.3
SPECIAL NOTE: The Emissivity Science Data Set in the NAALSED product is multidimensional, i.e., the emissivity layer is a stack of layers including mean and standard deviation for each of the five spectral Bands. MATLAB routines were used to write the data layer, which are executed in column-major rather than row-major order. "Column-major" means that arrays are read up and down instead of back and forth, resulting in an image with values rotated 90 degrees and flipped horizontally.
Please note NAALSED is affected as any other ASTER product by the loss of stable SWIR data from April 2008 forward.
1 Hulley, G.C., S.J. Hook, and , A.M. Baldridge, 2008, ASTER Land Surface Emissivity Database of California and Nevada, Geophysical Research Letters, Vol. 35, L13401, doi:10.1029/2008GL034507
2 Hulley G.C., and S.J. Hook, 2008, A New Methodology for Cloud Detection and Classification with Advanced Spaceborne Thermal Emission and Reflection (ASTER) Data , Geophysical Research Letters, Vol. 35, L16812, doi:10.1029/2008GL034644
3 Hulley, G. C. and S. J. Hook, 2009 The North American ASTER land surface emissivity database (NAALSED) version 2.0, Remote Sensing of Environment, vol. 113, no. 9, pp. 1967-1975, September
4 Hulley, G.C., and S.J. Hook, 2010, Generating Consistent Land Surface Temperature and Emissivity Products Between ASTER and MODIS Data for Earth Science Research, IEEE Transactions on Geoscience and Remote Sensing, DOI: 10.1109/TGRS.2010.2063034.
5 Hulley, G. C., S. J. Hook, and A. M. Baldridge, 2009. Validation of the North American ASTER Land Surface Emissivity Database (NAALSED) Version 2.0., Remote Sensing of Environment, 113, 2224-2233.
V003 data set release date: 2002-05-03
Data Set Characteristics:
Geographic Extent: (80°North, -171°West) (22°North, -54°West)
Scene Coverage: 1º x 1º tiles
Image Dimensions: 1,000 x 1,000
Tile Volume: ~40 MB
File Format: Hierarchical Data Format Version 5 (HDF5)
Map Projection: Geographic Lat/Lon
Access Constraints none
Use Constraints None
Role: TECHNICAL CONTACT
Phone: (580) 436-8717
Email: west.daniel at epa.gov
Office of Research and Development National Risk Management Research Laboratory Ground Water and Ecosystems Restoration Division P.O. Box 1198
Province or State: Oklahoma
Postal Code: 74821
Role: SERF AUTHOR
Phone: (301) 614-6898
Email: Tyler.B.Stevens at nasa.gov
NASA Goddard Space Flight Center Global Change Master Directory
Province or State: MD
Postal Code: 20771
Creation and Review Dates