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photo.init.1grass
Langue: en
Version: 336107 (ubuntu - 24/10/10)
Section: 1 (Commandes utilisateur)
NAME
photo.init - Interactively creates or modifies entries in a camera initial exposure station file for imagery group referenced by a sub-block.KEYWORDS
imagery, orthorectifySYNOPSIS
photo.initphoto.init help
photo.init group=name [--verbose] [--quiet]
Parameters:
- group=name
Name of imagery group for ortho-rectification
DESCRIPTION
Aerial photographs may be either vertical or oblique. Vertical photographs can be truly vertical (nadir), or slightly tilted (less than 3 degree from the vertical). Usually aerial photos are tilted to some degree. We refer to the term vertical photograph up to a tilt of 3 degree.Oblique aerial photographs are purposely taken with an angle between 3 and 90 degree from the nadir direction.
The use of photo.init (menu 6) is only required when rectifying a tilted or oblique aerial photo.
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) standard (e.g. 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, photo.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 <A HREF="photo.2target.html">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: __________
Use these values at run time? (1=yes, 0=no)
AFTER COMPLETING ALL ANSWERS, HIT <ESC> TO CONTINUE
(OR <Ctrl-C> TO CANCEL)
The INITIAL values for (XC,YC,ZC) are expressed in standard (e.g. UTM) coordinates, and represent an approximation for the location of the camera at the time of exposure.
-
X: East aircraft position;
Y: North aircraft position;
Z: Flight altitude above sea level
The INITIAL values for (omega,phi,kappa) are expressed in degrees, and represent an approximation for the cameras attitude at the time of exposure.
-
Omega (roll): Raising or lowering of the wings (turning around the aircraft's axis);
Phi (pitch): Raising or lowering of the aircraft's front (turning around the wings' axis);
Kappa (yaw): Rotation needed to align the aerial photo to true north: needs to be denoted as +90 degree for clockwise turn and -90 degree for a counterclockwise turn.
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.
If Use these values at run time? (1=yes, 0=no) is set to 0, the values in this menu are not used.
SEE ALSO
i.ortho.photo, photo.camera, photo.2image, photo.2target, photo.rectifyAUTHOR
Mike Baba, DBA Systems, Inc.Last changed: $Date: 2008-10-22 11:59:36 +0200 (mer, 22 ott 2008) $
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