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Design challenges of ASTER in visible and near-infrared spectral region

This paper presents the preliminary design results of the visible and near-infrared radiometer (VNIR) of the ASTER instrument for the EOS-AM1 program. The VNIR is a spaceborne radiometer employing push broom scanning with 5,000 element CCD sensors. The VNIR provides image data with high spatial resolution of 15 X 15 m, and has the pointing capability of +/- 24 deg in the cross-track direction to obtain a wide swath. The VNIR also provides stereoscopic image data in band 3 (0.76 - 0.86 micrometers ) with nadir- and backward- looking telescopes for topographical studies and mapping of the earth.