glb_sub_point_graphic.pro

NAME: glb_sub_point_graphic PURPOSE: Computes the planetographic sub-point in body coordinates. CATEGORY: NV/LIB/GLB CALLING SEQUENCE: n = glb_sub_point_graphic(gbd, r) ARGUMENTS: INPUT: gbd: Array (nt) of any subclass of GLOBE descriptors. r: Array (nv,3,nt) of points in the BODY frame. OUTPUT: NONE KEYWORDS: INPUT: epsilon: Convergence criterion for angular deviation from normal. Default is 1d-8. niter: Maximum number of iterations. Default is 5000. OUTPUT: NONE RETURN: Array (nv,3,nt) points in the BODY frame that lie on the surface of each globe, directly 'beneath' r, i.e., such that each planetographic surface normal points at each r. STATUS: Complete MODIFICATION HISTORY: Written by: Spitale, 1/1998 Adapted by: Spitale, 5/2016 Added iteration count: Moretto, 8/2016