photo.init(1)		      Grass User's Manual		 photo.init(1)



_T_h_i_s _i_s _n_o_t _a _c_o_m_m_a_n_d _i_t_s_e_l_f_, _b_u_t _a_n _o_p_t_i_o_n _o_f _t_h_e _c_o_m_m_a_n_d _i_._o_r_t_h_o_._p_h_o_t_o

NNAAMMEE
       _p_h_o_t_o_._i_n_i_t  - An imagery function that creates or modifies the optional
       entries in a camera initial exposure station file for an imagery group.
       _(_G_R_A_S_S _I_m_a_g_e _P_r_o_c_e_s_s_i_n_g _P_r_o_g_r_a_m_)

SSYYNNOOPPSSIISS
       Selected from _i_._o_r_t_h_o_._p_h_o_t_o

DDEESSCCRRIIPPTTIIOONN
       _p_h_o_t_o_._i_n_i_t  creates  or	modifies  entries in a camera initial exposure
       station file for  imagery  group  referenced  by  a  sub-block.	 These
       entries include: the (XC,YC,ZC) UTM approximate coordinates of the cam-
       era exposure station; initial roll, pitch, and yaw angles (in  degrees)
       of the cameras attitude; and the _a _p_r_i_o_r_i standard deviations for these
       parameters.  During the imagery program, hoto.rectify, the initial cam-
       era exposure station file is used for computation of the ortho-rectifi-
       cation parameters.  If no initial camera exposure station  file	exist,
       the default values are computed from the control points file created in
       _p_h_o_t_o_._2_t_a_r_g_e_t .


       The following menu is displayed:

	       Please provide the following information

	    INITIAL XC: Meters		      __________
	    INITIAL YC: Meters		      __________
	    INITIAL ZC: Meters		      __________
	    INITIAL omega (roll) degrees:     __________
	    INITIAL phi  (pitch) degrees:     __________
	    INITIAL kappa  (yaw) degrees:     __________

	    Standard Deviation XC: Meters     __________
	    Standard Deviation YC: Meters     __________
	    Standard Deviation ZC: Meters     __________
	    Std. Dev. omega (roll) degrees:   __________
	    Std. Dev. phi  (pitch) degrees:   __________
	    Std. Dev. kappa  (yaw) degrees:   __________

	    AFTER COMPLETING ALL ANSWERS, HIT <ESC> TO CONTINUE
			 (OR <Ctrl-C> TO CANCEL)

       The INITIAL values for (XC,YC,ZC) are expressed in UTM coordinates, and
       represent  an  approximation for the location of the camera at the time
       of exposure.


       The INITIAL values for (omega,phi,kappa) are expressed in degrees,  and
       represent  an  approximation  for  the cameras attitude	at the time of
       exposure.


       The standard deviations for (XC,YC,ZC) are expressed in meters, and are
       used as _a _p_r_i_o_r_i values for the standard deviations used in computation
       of the ortho rectification parameters.


       The standard deviations for (omega,phi,kappa) are expressed in degrees,
       and  are  used  as  _a _p_r_i_o_r_i values for the standard deviations used in
       computation of the ortho rectification parameters.





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       _p_h_o_t_o_._c_a_m_e_r_a



       _p_h_o_t_o_._2_i_m_a_g_e



       _p_h_o_t_o_._2_t_a_r_g_e_t



       _p_h_o_t_o_._r_e_c_t_i_f_y




AAUUTTHHOORR
       Mike Baba,  DBA Systems, Inc.

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GRASS 5.0							 photo.init(1)
