Abstract: This paper presents a preliminary result of crossover analysis and adjustment of Chang’E-1(CE-1) Laser Altimeter (LAM) data of the Moon. With about 9.12 million altimetric points acquired by the laser altimeter, we derived more than 1.4 million crossovers covering the entire lunar surface after eliminating outliers of orbits and altimetric points. The distribution of crossover points, the differences of crossover and the relationship with time have been systematically analyzed. Least-squares crossover adjustments with four basis functions of time (trigonometric functions and polynomials) are developed and compared to reconcile the LAM data by minimizing the crossover residuals globally. In a study area (0°N~60°N, 50°W~0°W), the crossover residuals can be reduced from 62.1m to lower than 37m with anyone of the four models. The artefacts are reduced and the quality of the DEM generated from the adjusted LAM data is improved accordingly.

Key words: Chang’E-1, Laser Altimeter, Crossover, Spatial and Temporal distribution, Adjustment, DEM.