[GRASS-dev] GRASS 7 timeline

[Markus Neteler]

On Thu, Mar 15, 2007 at 12:54:52PM +0000, Glynn Clements wrote:
...
> Can someone describe (briefly) how the rectification performed by
> photo.rectify differs from that performed by i.rectify?

The main difference is that photo.rectify is a 3D (x,y,z) [1]
rectification while i.rectify is 2D (x,y). The GCPs structure
contains one more dimension for photo.rectify.

In brief, see
imagery/i.ortho.photo/alg_photo_rectify.txt
imagery/i.ortho.photo/alg_camera_position.txt

In the long run, all 2D rectification code should be covered
by the 3D rectification code with z set to NULL.

Markus

[1] z is taken from the corresponding DEM elevation