G-LiHT Hyperspectral Radiance

PI: Bruce Cook


Goddard’s LiDAR, Hyperspectral, and Thermal Imager (G-LiHT) mission is 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 Radiance data product (GLRADS) is to provide high-resolution radiance data, ranging in wavelength from 418 to 920 nanometers across 114 spectral bands. Radiance data is computed as the ratio between observed upwelling radiance and downwelling hemispheric irradiance, then 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 radiance is a close approximation of surface radiance.

GLRADS 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.

Metadata for individual flights is available as a pdf file and can be accessed through the Documentation button on this landing page. It contains information related to flight plans, acquisition details, field observations, and instrument specifications.

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Collection and Granule


Characteristic Description
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


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

Layers / Variables

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

Product Quality

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

About the image

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

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User Guide

G-LiHT Metadata

Using the Data

Access Data


DOI: 10.5067/Community/GLIHT/GLRADS.001