m.gc2ll(1)	       Grass User's Manual	       m.gc2ll(1)



NNAAMMEE
       mm..ggcc22llll	 - Converts geocentric to geographic coordinates.
       _(_G_R_A_S_S _D_a_t_a _I_m_p_o_r_t_/_P_r_o_c_e_s_s_i_n_g _P_r_o_g_r_a_m_)

SSYYNNOOPPSSIISS
       mm..ggcc22llll xx==_# yy==_# zz==_# ss==_s_p_h_e_r_o_i_d

DDEESSCCRRIIPPTTIIOONN
       _m_._g_c_2_l_l returns geographic coordinates for geocentric ones
       supplied  by  the user.	It performs the reverse operation
       of the GRASS program _m_._l_l_2_g_c.  The xx, yy and zz  values  are
       the  three  dimensions  needed to locate a point in three-
       dimensional space.  The values that  are  printed  include
       the  latitude, the longitude and the height above (or dis-
       tance below) the spheroid.


       The list of spheroids available is somewhat  dynamic.   It
       may  not contain exactly the ones listed below.	To deter-
       mine the current list of possible spheroids,  simply  type
       in: mm..ggcc22llll xx==_0 yy==_0 zz==_0 ss==_h_e_l_p

       A  list	of  available  spheroids  will	be printed on the
       screen.	If the spheroid desired is not on the  list,  the
       values  for  the  semi-major  axis  and	the  eccentricity
       squared for the spheroid may be	entered  in  place  of	a
       spheroid   name	 in   the   following  format:	ss==aa==_s_e_m_i_-
       _m_a_j_o_r___a_x_i_s,ee==_e_c_c_e_n_t_r_i_c_i_t_y___s_q_u_a_r_e_d




   SSOOMMEE PPOOSSSSIIBBLLEE SSPPHHEERROOIIDDSS
       (_T_h_e _o_n_-_l_i_n_e _l_i_s_t_i_n_g _i_n_c_l_u_d_e_s _o_n_l_y _t_h_e _s_p_h_e_r_o_i_d _n_a_m_e_s)

       Spheroid  Commonly used	for:  Semi-major  axis	   Eccen-
       tricity sqrd
       australian     Australia      6378160.0 0.0066945419
       bessel	      Japan		  6377739.155	 0.0066743722
       clark66	      N. America	  6378206.4 0.006768658
       clark80	      France,
       Africa	   6378249.145	  0.0068035113
       everest	      India,
       Burma	    6377276.345    0.0066378466
       international  Europe		  6378388.0 0.00672267
       wgs72	      worldwide 			   cover-
       age  6378135.0 0.006694317778


EEXXAAMMPPLLEE
       The command:
	      mm..ggcc22llll xx==_0_._0 yy==_0_._0 zz==_6_3_5_6_7_5_0_._5_2_0_0_1_7 ss==_w_g_s_7_2

       Results:
	      lat=90N

	      lon=90W

	      h=0.0000


NNOOTTEESS
       For a brief discussion of spheroids see _m_._l_l_2_u.


       For  a  brief  discussion  of  geocentric  coordinates see
       _m_._l_l_2_g_c.


       This is an experimental program.  It is part of an initial
       effort to incorporate geographic coordinates into GRASS.

SSEEEE AALLSSOO
       _m_._d_a_t_u_m_._s_h_i_f_t

       _m_._l_l_2_g_c

       _m_._l_l_2_u

       _m_._u_2_l_l

AAUUTTHHOORR
       Michael	 Shapiro,   U.S.Army   Construction   Engineering
       Research Laboratory

       _L_a_s_t _c_h_a_n_g_e_d_: _$_D_a_t_e_: _2_0_0_2_/_0_1_/_2_5 _0_5_:_4_5_:_3_3 _$



GRASS 5.0					       m.gc2ll(1)
