[GRASS-dev] v.transform, wishlist #420

[Glynn Clements]

Hamish wrote:

> > That's what I thought when I looked at that code, but the thing is not
> > so simple, as when using v.transform, there is not way to know,
> > whether the 'to' or 'from' are coordinates are lat/long or not,
> > because v.transform is used to transform between different coordinate
> > systems, and the current location does not necessarily reflect either
> > of these.
> 
> No, v.transform Is Not for transforming between different coordinate
> systems. Use v.proj for that. It's for adjusting coordinates in 3D
> space.
> 
> It's description implies otherwise: "Transforms a vector map layer from
> one coordinate system into another coordinate system."

Whoever wrote that was presumably thinking about the use of the term
"coordinate system" in mathematics/geometry rather than in cartography.

As the user will probably view it from a cartographic perspective,
it's rather misleading.

-- 
Glynn Clements <glynn at gclements.plus.com>