[LALT_NP.txt] #Gridded topographic data in the north polar region (>+85‹) 1)File description *ASCII *File name: LALT_NP.txt *Data Order (unit): [Longitude (degree)] [Latitude (degree)] [Height (km)] *Format (Fortran): f12.6, f16.6, f16.6 *Sample: -8.270751 89.757803 -0.084717 -8.092885 89.757803 -0.084762 -7.915020 89.757803 -0.087002 --- *Horizontal resolution (latitude): 0.015625‹ [(1/64)‹ ] *Horizontal resolution (longitude): 0.179‹ *Data number: 647680 *e-99f in the eHeightf column would be a void datum. 2) Notes *Instrument: KAGUYA(SELENE) / LALT *Observation Period: From 30 December, 2007 to 31 March, 2008. *The lunar global topographic data in the above period are interpolated (nearest neighbor method) to the grid data using commands of GMT software (Generic Mapping Tool) [1]. *The coordinate is based on the mean Earth / polar axis system[2]. The height reference is the sphere whose radius is 1737.4 km centered on the COM (center of mass). *This data set was used for the analysis of the sun lit rate around the lunar north pole [3]. 3) References [1] P. Wessel, W. H. F. Smith, EOS 72, 441 (1991). [2] P. K. Seidelmann et al., Celestial Mech. Dyn. Astr. 98, 155, (2007). [3] H. Noda et al., GRL, 35, L24203, (2008).