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

## NAME

photo.init - An imagery function that creates or modifies the optional entries in a camera initial exposure station file for an imagery group.
(GRASS Image Processing Program)

## SYNOPSIS

Selected from i.ortho.photo

## DESCRIPTION

photo.init 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 camera exposure station; initial roll, pitch, and yaw angles (in degrees) of the cameras attitude; and the a priori standard deviations for these parameters. During the imagery program, hoto.rectify, the initial camera exposure station file is used for computation of the ortho-rectification parameters. If no initial camera exposure station file exist, the default values are computed from the control points file created in photo.2target .

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 priori 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 priori values for the standard deviations used in computation of the ortho rectification parameters.

## SEE ALSO

i.ortho.photo
photo.camera
photo.2image
photo.2target
photo.rectify

## AUTHOR

Mike Baba, DBA Systems, Inc.

Last changed: $Date: 2002/01/25 05:45:34 $