FUNCTION get_scan_struc_arr :Description: Obtain a structure storing SD data sorted by scan. Usually this function is used by the other routines. :EXAMPLES: dat = get_scan_struc_arr( 'sd_hok_vlos_1' ) :Author: Tomo Hori (E-mail: horit at stelab.nagoya-u.ac.jp) :HISTORY: 2011/07/01: Initial release $LastChangedBy: jwl $ $LastChangedDate: 2014-02-10 16:54:11 -0800 (Mon, 10 Feb 2014) $ $LastChangedRevision: 14265 $ $URL: svn+ssh://thmsvn@ambrosia.ssl.berkeley.edu/repos/spdsoft/trunk/projects/erg/ground/radar/superdarn/get_scan_struc_arr.pro $;