Opened 6 weeks ago

Last modified 6 weeks ago

#3467 new defect

i.ortho.init: roll,pitch and yaw should not be presented as equivalent to omega, phi, kappa

Reported by: mlennert Owned by: grass-dev@…
Priority: normal Milestone: 7.4.0
Component: Imagery Version: svn-trunk
Keywords: Cc:
CPU: Unspecified Platform: Unspecified

Description

The man page of 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 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.

Change History (2)

comment:1 Changed 6 weeks ago by neteler

Maybe the i.ortho.photo chapter of our GRASS GIS book (2nd edition) can be of help:

https://grassbook.org/wp-content/uploads/2015/04/grassbook_2nd_2004_chapter10_aerial.pdf

--> see p266-267

comment:2 in reply to:  1 Changed 6 weeks ago by mlennert

Replying to neteler:

Maybe the i.ortho.photo chapter of our GRASS GIS book (2nd edition) can be of help:

https://grassbook.org/wp-content/uploads/2015/04/grassbook_2nd_2004_chapter10_aerial.pdf

--> see p266-267

The text in the book is the same as in the manual page, so the issue remains.

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