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 distance
       below) the spheroid.


       The list of spheroids available is somewhat dynamic.  It may  not  con-
       tain  exactly  the ones listed below.  To determine 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	 Eccentricity 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 coverage  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)
