This is not a command in itself, but an option to the command i.ortho.photo

NAME

photo.camera - An imagery function that creates or modifies entries in a camera reference file.
(GRASS Image Processing Program)

SYNOPSIS

photo.camera option must be selected from the GRASS Image Processing Program i.ortho.photo .

DESCRIPTION

photo.camera creates or modifies entries in a camera reference file. For ortho-photo rectification, a camera reference 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:               camera name______
	CAMERA IDENTIFICATION:     identification___
	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 reasuae coordinate pairs to be entered below.

You are then ask to enter the X and Y photo coordinates of each fiducial as follows:

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. On this screen you should enter the fiducial or ressuae photo-coordinates as given in the camera calibration report. The X, and Y coordinates are in milli-meters from the principle point.

SEE ALSO

i.ortho.photo
photo.2image
photo.2target
photo.init

AUTHOR

Mike Baba, DBA Systems, Inc.