3
Aerial photographs may be either vertical or oblique. Vertical photographs
4
can be truly vertical (nadir), or slightly tilted (less than 3 degree
5
from the vertical). Usually aerial photos are tilted to some degree. We
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refer to the term <i>vertical photograph</i> up to a tilt of 3 degree.
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Oblique aerial photographs are purposely taken with an
9
angle between 3 and 90 degree from the nadir direction.
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<b>The use of <EM>photo.init</EM> (menu 6) is only required when rectifying a
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tilted or oblique aerial photo.</b>
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<EM>photo.init</EM> creates or modifies entries in a camera initial exposure
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station file for imagery group referenced by a sub-block. These entries
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include: the (XC,YC,ZC) standard (e.g. UTM) approximate coordinates of the camera exposure
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station; initial roll, pitch, and yaw angles (in degrees) of the cameras
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attitude; and the <EM>a priori</EM> standard deviations for these
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parameters. During the imagery program, photo.rectify, the initial camera
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exposure station file is used for computation of the ortho-rectification
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parameters. If no initial camera exposure station file exist, the default
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values are computed from the control points file created in <EM><A
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HREF="photo.2target.html">photo.2target</A></EM>.
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The following menu is displayed:
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Please provide the following information
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INITIAL XC: Meters __________
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INITIAL YC: Meters __________
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INITIAL ZC: Meters __________
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INITIAL omega (roll) degrees: __________
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INITIAL phi (pitch) degrees: __________
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INITIAL kappa (yaw) degrees: __________
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Standard Deviation XC: Meters __________
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Standard Deviation YC: Meters __________
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Standard Deviation ZC: Meters __________
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Std. Dev. omega (roll) degrees: __________
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Std. Dev. phi (pitch) degrees: __________
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Std. Dev. kappa (yaw) degrees: __________
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Use these values at run time? (1=yes, 0=no)
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AFTER COMPLETING ALL ANSWERS, HIT <ESC> TO CONTINUE
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(OR <Ctrl-C> TO CANCEL)
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The INITIAL values for (XC,YC,ZC) are expressed in standard (e.g. UTM) coordinates, and
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represent an approximation for the location of the camera at the time of
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<li> X: East aircraft position;
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<li> Y: North aircraft position;
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<li> Z: Flight altitude above sea level
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The INITIAL values for (omega,phi,kappa) are expressed in degrees, and
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represent an approximation for the cameras attitude at the time of
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<li> Omega (roll): Raising or lowering of the wings (turning around the
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<li> Phi (pitch): Raising or lowering of the aircraft's front (turning
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around the wings' axis);
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<li> Kappa (yaw): Rotation needed to align the aerial photo to true north:
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needs to be denoted as +90 degree for clockwise turn and -90 degree for
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a counterclockwise turn.
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The standard deviations for (XC,YC,ZC) are expressed in meters, and
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are used as <EM>a priori</EM> values for the standard deviations used in
82
computation of the ortho rectification parameters.
85
The standard deviations for (omega,phi,kappa) are expressed in degrees, and
86
are used as <EM>a priori</EM> values for the standard deviations used in
87
computation of the ortho rectification parameters.
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If <i>Use these values at run time? (1=yes, 0=no)</i> is set to 0, the
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values in this menu are not used.
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<A HREF="i.ortho.photo.html">i.ortho.photo</A>,
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<A HREF="photo.camera.html">photo.camera</A>,
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<A HREF="photo.2image.html">photo.2image</A>,
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<A HREF="photo.2target.html">photo.2target</A>,
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<A HREF="photo.rectify.html">photo.rectify</A>
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Mike Baba, DBA Systems, Inc.
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<i>Last changed: $Date: 2008-10-22 11:59:36 +0200 (Wed, 22 Oct 2008) $</i>