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i.ortho.init(1grass) | Grass User's Manual | i.ortho.init(1grass) |
NAME¶
i.ortho.init - Interactively creates or modifies entries in a camera initial exposure station file for imagery group referenced by a sub-block.KEYWORDS¶
imagery, orthorectifySYNOPSIS¶
i.ortho.initi.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
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 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.
SEE ALSO¶
i.ortho.photo, i.photo.2image, i.photo.2target, i.ortho.elev, i.ortho.camera, i.ortho.transform, i.photo.rectifyAUTHOR¶
Mike Baba, DBA Systems, Inc.Last changed: $Date: 2017-01-14 16:23:42 +0100 (Sat, 14 Jan 2017) $
SOURCE CODE¶
Available at: i.ortho.init source code (history)Main index | Imagery index | Topics index | Keywords index | Graphical index | Full index
© 2003-2019 GRASS Development Team, GRASS GIS 7.6.0 Reference Manual
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