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

[mlennert]

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.

[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

[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.

[neteler]

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[neteler]

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[martinl]

Bump milestone to 7.4.4

[neteler]

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