[GRASS-dev] [GRASS GIS] #3467: i.ortho.init: roll, pitch and yaw should not be presented as equivalent to omega, phi, kappa

[GRASS GIS]

#3467: i.ortho.init: roll,pitch and yaw should not be presented as equivalent to
omega, phi, kappa
-------------------------+-------------------------
 Reporter:  mlennert     |      Owner:  grass-dev@…
     Type:  defect       |     Status:  new
 Priority:  normal       |  Milestone:  7.4.0
Component:  Imagery      |    Version:  svn-trunk
 Keywords:               |        CPU:  Unspecified
 Platform:  Unspecified  |
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 The man page of [https://grass.osgeo.org/grass73/manuals/i.ortho.init.html
 i.ortho.init] says


 {{{
  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.
 }}}

 However, according to [https://support.pcigeomatics.com/hc/en-
 us/articles/203483349-Heading-Pitch-Roll-vs-Omega-Phi-Kappa PCI Geomatics]
 and other software manuals, roll, pitch and yaw are not equivalent to
 omega, phi, kappa, as the former are expressed relative to a local plane,
 while the latter are expressed relative to a projection system plane.

 Someone more knowledgeable than me should verify this, but probably the
 man page needs precision concerning what exactly is expected in the
 module.

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Ticket URL: <https://trac.osgeo.org/grass/ticket/3467>
GRASS GIS <https://grass.osgeo.org>