月周回衛星「かぐや（SELENE）」マルチバンドイメージャデータの幾何補正

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SELENE (KAGUYA) is a Japanese lunar polar orbiter that was launched from Tanegashima Space Center on September 14, 2007, onboard the 13th H-IIA launch vehicle. The Lunar Imager/SpectroMeter (LISM) developed for SELENE consists of three subsystems : the Multiband Imager (MI), Terrain Camera (TC), and Spectral Profiler (SP).MI can obtain entire lunar surface multispectral imagery of the highest spatial resolution that has ever been reached. It is a push-broom imager consisting of a visible sensor (MI-VIS) and a near-infrared sensor (MI-NIR) and has nine spectral bands, from visible to near-infrared wavelengths. The spatial resolution of MI-VIS is 20m, and that of MI-NIR is 62m at an orbital altitude of 100km. Each observation band of MI has parallax between it and all the others, due to its instrument structure. Therefore, in order to obtain sufficient accuracy of inter-band registration, we must correct geometric distortions caused by the topographic effect. However, it is possible to carry out stereo 3D measurement using the inter-band parallaxes.We developed a rigorous, high-speed method to transform a digital image arbitrarily, given local area matching on a pixel-to-pixel basis. It has thus become possible to improve the accuracy of the lunar geological investigation by MI inter-band stereo 3D measurement and topographic correction of multiband images. With the local area matching method, we devised several algorithmic innovations.In this paper, we describe the geometric correction methods for MI, the geometric accuracy verification results using CG images prior to the launch of SELENE (KAGUYA), and the early analysis results of actually observed MI data regarding geometric correction.

月周回衛星「かぐや（SELENE）」マルチバンドイメージャデータの幾何補正

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