The SMART-1 spacecraft was launched on 27 September 2003 end reached its lunar baseline science orbit on 13 March 2005 for a nominal science period of six months and one year extension. During these 18 months, the AMIE camera aboard the spacecraft acquired about 32 000 images, that we use to produce a complete atlas of the Moon. SMART-1 operated in an eccentric polar orbit with the perilune close to the South pole at a minimum distance of 400 km and an apolune distance of about 6400 km. The area south off 87 deg S and various spots in the southern hemisphere are covered by the AMIE camera with a resolution better than 50 meters per pixel, the complete Southern hemisphere with a resolution better than 100 meters per pixel, and the complete Northern hemisphere with a resolution better than 250 meters per pixel. However, during the Earth escape phase, the radiation significantly impacted the AMIE sensor, invalidating the laboratory dark and flat fields. The altered sensor behaviour was compensated by a new calibration procedure based on in-flight images. Each AMIE image frame of 1024 X 1024 pixels is divided into areas covered by four different filters, designed for multi-spectral analysis. We calibrated the different areas to compensate for the the largely different sensitivity, so that they can be used as full-frame grey scale images. The resulting 1024 X 1024 pixel images were geographically referenced and mosaiced considering illumination angle and image quality in order to produce 88 lunar surface maps with varying resolution, lower at the North pole and higher at the South pole. The final maps achieved a coverage of approximately 96 % of the Lunar surface. We present the techniques adopted for the selection, calibration and mosaicing of the AMIE images and show some applications.
|Publication status||Published - 1 Jan 2014|