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i.ortho.init(1)		    GRASS GIS User's Manual	       i.ortho.init(1)

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,	orthorectify

SYNOPSIS
       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=nameA [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	photo-
       graphs  can  be truly vertical (nadir), or slightly tilted (less	than 3
       degree from the vertical). Usually aerial photos	are tilted to some de-
       gree.  We  refer	 to the	term vertical photograph up to a tilt of 3 de-
       gree.
       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 en-
       tries include: the (XC,YC,ZC) standard (e.g. UTM)  approximate  coordi-
       nates  of the camera exposure station; initial roll, pitch, and yaw an-
       gles (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 cam-
       era 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.

	   o   X: East aircraft	position;

	   o   Y: North	aircraft position;

	   o   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 ex-
       posure.

	   o   Omega  (roll): Raising or lowering of the wings (turning	around
	       the aircraft's axis);

	   o   Phi (pitch): Raising or lowering	of the aircraft's front	(turn-
	       ing around the wings' axis);

	   o   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.or-
       tho.camera, i.ortho.transform, i.photo.rectify

AUTHOR
       Mike Baba,  DBA Systems,	Inc.

SOURCE CODE
       Available at: i.ortho.init source code (history)

       Main  index | Imagery index | Topics index | Keywords index | Graphical
       index | Full index

       A(C) 2003-2020 GRASS Development	Team, GRASS GIS	7.8.3 Reference	Manual

GRASS 7.8.3						       i.ortho.init(1)

NAME | KEYWORDS | SYNOPSIS | DESCRIPTION | SEE ALSO | AUTHOR | SOURCE CODE

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