Spectral calibration of the EO-1 Advanced Land Imager

摘要

Abstract: The spectral response of the Earth Observing 1 Advanced Land Imager (ALI) has been characterized at Lincoln Laboratory as a fully assembled instrument in a thermal vacuum chamber at operational temperatures. The focal pane for this instrument is partially populated over a 3 degree cross-track segment with 9 multispectral bands having a 30-meter ground sample distance (GSD) and a single panchromatic band having a 10- meter GSD. These bands were selected to mimic the six Landsat-7 VNIR/SWIR bands with three additional bands covering 0.433-0.453, 0.845-0.890, 1.20-1.30 $mu@m. The instrument system level response was characterized spectrally form 400-900 nm in 2 nm increments and from 900- 2500 nm in 4 nm increments using a collimated monochromatic beam. Spectral artifacts introduced by the monochromatic and the collimator were accounted for using spectrally calibrated silicon and lead-sulfide detector which sampled the beam at each measurement interval. In this paper we describe the techniques employed during spectral calibration, present the measured in band and out of band spectral response for all VNIR bands, and compare the results to those obtained at the component level. !6