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



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NNAAMMEE
       _p_h_o_t_o_._c_a_m_e_r_a - An imagery function that creates	or  modi-
       fies entries in a camera reference file.
       _(_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
       _p_h_o_t_o_._c_a_m_e_r_a  option must be selected from the GRASS Image
       Processing Program _i_._o_r_t_h_o_._p_h_o_t_o

DDEESSCCRRIIPPTTIIOONN
       _p_h_o_t_o_._c_a_m_e_r_a creates or modifies entries in a camera  ref-
       erence  file. For ortho-photo rectification, a camera ref-
       erence file is required for computation of  scanned  image
       to photo-coordinate transformation parameters.


       The  first prompt in the program will ask you for the name
       of the camera reference file to be  created  or	modified.
       You  may  create a new camera reference file by entering a
       new name, or modify an existing camera reference  file  by
       entering the name of an existing camera file.


       After  entering	the  camera  file name, following menu is
       displayed:


       Please provide the following information




	    CAMERA NAME:	       _c_a_m_e_r_a _n_a_m_e______
	    CAMERA IDENTIFICATION:     _i_d_e_n_t_i_f_i_c_a_t_i_o_n___
	    CALIBRATED FOCAL LENGTH mm.:_________________
	    POINT OF SYMMETRY (X)   mm.:_________________
	    POINT OF SYMMETRY (Y)   mm.:_________________
	    MAXIMUM NUMBER OF FIDUCIALS:_________________

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

       The camera name and  identification  describe  the  camera
       reference file.	The calibrated focal length and the point
       of symmetry are	used  in  computing  the  photo-to-target
       transformation parameters.  These values should be entered
       from the camera calibration report (usually available from
       the photograph supplier).  The maximum number of fiducials
       will determine the number of fiducial or reseau coordinate
       pairs to be entered below.


       You are then ask to enter the X and Y photo coordinates of
       each fiducial as follows. On this screen you should  enter
       the  fiducial  or reseau photo-coordinates as given in the
       camera calibration report. The X, and Y coordinates are in
       milli-meters from the principle point.


       Please provide the following information

	    Fid# FID ID 	  X	     Y

	    1__  _____		0.0___	  0.0___
	    2__  _____		0.0___	  0.0___
	    3__  _____		0.0___	  0.0___
	    4__  _____		0.0___	  0.0___
	    5__  _____		0.0___	  0.0___
	    6__  _____		0.0___	  0.0___
	    7__  _____		0.0___	  0.0___
	    8__  _____		0.0___	  0.0___
	    9__  _____		0.0___	  0.0___
	    10_  _____		0.0___	  0.0___

		      next:  end__

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

       The  input display is repeated until the number of MAXIMUM
       FIDUCIALS is reached.



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       _p_h_o_t_o_._2_t_a_r_g_e_t



       _p_h_o_t_o_._i_n_i_t




AAUUTTHHOORR
       Mike Baba, DBA Systems, Inc.



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GRASS 5.0					  photo.camera(1)
