Provided by: grass-doc_7.8.2-1build3_all
i.ortho.init - Interactively creates or modifies entries in a camera initial exposure station file for imagery group referenced by a sub-block.
i.ortho.init i.ortho.init --help i.ortho.init [-rp] group=name [xc=float] [yc=float] [zc=float] [xc_sd=float] [yc_sd=float] [zc_sd=float] [omega=float] [phi=float] [kappa=float] [omega_sd=float] [phi_sd=float] [kappa_sd=float] [--help] [--verbose] [--quiet] [--ui] Flags: -r Use initial values at run time -p Print initial values --help Print usage summary --verbose Verbose module output --quiet Quiet module output --ui Force launching GUI dialog Parameters: group=name [required] Name of imagery group for ortho-rectification xc=float Initial Camera Exposure X-coordinate yc=float Initial Camera Exposure Y-coordinate zc=float Initial Camera Exposure Z-coordinate xc_sd=float Apriori X-coordinate standard deviation yc_sd=float Apriori Y-coordinate standard deviation zc_sd=float Apriori Z-coordinate standard deviation omega=float Initial Camera Omega (roll) degrees phi=float Initial Camera Phi (pitch) degrees kappa=float Initial Camera Kappa (yaw) degrees omega_sd=float Apriori Omega (roll) standard deviation phi_sd=float Apriori Phi (pitch) standard deviation kappa_sd=float Apriori Kappa (yaw) standard deviation
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 i.ortho.init (menu 6) is only required when rectifying a tilted or oblique aerial photo. i.ortho.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, i.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 i.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.
i.ortho.photo, i.photo.2image, i.photo.2target, i.ortho.elev, i.ortho.camera, i.ortho.transform, i.photo.rectify
Mike Baba, DBA Systems, Inc.
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