PRO get_sd_vlshell :Description: Generate tplot variables cotaining true velocities by assuming that the true velocity is aligned to the L-shell direction. :Params: vlos_vn: Name of tplot variable for LOSV data (sd_???_vlos_?). :Keywords: angle_var: Set this keyword to generate a tplot variable containing the angles between the beam direction and the local MLT direction for each pixel. See the comment at Line 247 for details. exclude_angle: Set an angle range, say [85.,95.], to substitute the L-shell assumed true velocities for pixels with beam-MLT angles falling in this range, with NaN. vmag: additionally generate the V_MLAT (the MLAT component of LOSV) and V_MLT (the MLT component of LOSV) tplot variables Currently glatp,glatm,glonp, and glonm are used only for debugging. :Examples: get_sd_vlshell, 'sd_hok_vlos_1', exclude_angle=[85,95], /angle_var, /vmag :History: 2013/02/06: Initial release 2013/11/01: implemented vmag keyword :Author: Tomo Hori (E-mail: horit at stelab.nagoya-u.ac.jp) $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_sd_vlshell.pro $