GLREFL v001

G-LiHT Hyperspectral Reflectance


PI: Bruce Cook

Description

Goddard’s LiDAR, Hyperspectral, and Thermal Imager (G-LiHT) mission utilizes a portable, airborne imaging system that aims to simultaneously map the composition, structure, and function of terrestrial ecosystems. G-LiHT primarily focuses on a broad diversity of forest communities and ecoregions in North America, mapping aerial swaths over the Conterminous United States (CONUS), Alaska, Puerto Rico, and Mexico.

The purpose of G-LiHT’s Hyperspectral Reflectance data product (GLREFL) is to provide high-resolution reflectance data, ranging in wavelength from 418 to 920 nanometers across 114 spectral ranges. Reflectance data is computed as the ratio between observed upwelling radiance and downwelling hemispheric irradiance and corrected for differences in cross-track illumination and Bidirectional Reflectance Distribution Function (BRDF) using an empirically derived multiplier. At a nominal flying height of 335 m above ground level (AGL), the at-sensor reflectance is a close approximation of surface reflectance.

GLREFL data are processed as a zipped raster data product (GeoTIFF) with associated header file (.hdr) at 1 meter spatial resolution over locally defined areas. A low-resolution browse is also provided with a color map applied in PNG format.

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Characteristics

Collection and Granule

Collection

Characteristic Description
CollectionG-LiHT
DOI10.5067/Community/GLIHT/GLREFL.001
File Size>1 GB
Temporal ResolutionVaries
Temporal Extent2011-06-30 to Present
Spatial ExtentNorth America
Coordinate SystemUniversal Transverse Mercator (UTM)
DatumWorld Geodetic System (WGS84)
File FormatGeoTIFF
Geographic DimensionsVariable

Granule

Characteristic Description
Number of Science Dataset (SDS) Layers1
Columns/RowsVariable
Pixel Size1 m

Layers

SDS Name Description Units Data Type Fill Value No Data Value Valid Range Scale Factor
Band 1-114 Reflectance N/A 32-bit floating point N/A N/A 0 to 10000 0.0001

Product Quality

Information on the GLREFL product can be found on the G-LiHT website.


About the image

G-LiHT Hyperspectral Reflectance Mosaic image, acquired over Bowie, Maryland in June, 2012.

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Documentation

User Guide

Using the Data

Access Data

Citation

DOI: 10.5067/Community/GLIHT/GLREFL.001