[GRASS-dev] Re: [GRASS-user] a suggestion for v.transform

[Dylan Beaudette]

On 6/15/07, Glynn Clements <glynn at gclements.plus.com> wrote:
>
> Dylan Beaudette wrote:
>
> > > > There has been a thread about how v.transform functions and Glynn pointed
> > > > out that part of the problem is that the short description does not
> > > > really describe what it does, at least from a GIS perspective:
> > > >
> > > > " Transforms a vector map layer from one coordinate system into another
> > > > coordinate system."
> > > >
> > > > I'm working on wxgrass menus at the moment and trying to come up with
> > > > useful menu entries. A better short description for v.transform might be:
> > > >
> > > > "Reposition (shift and rotate) vector file in coordinate space"
> > > >
> > > > Thoughts?
> > >
> > > It can also scale.
> >
> > ... and to be complete, it can also shear.
>
> Only when using the pointsfile= option; there isn't any direct way to
> specify a transformation which includes shear.
>

Yes, good (point) . It would be an interesting add-on, to manually
specify the components of the affine transformation matrix. perhaps in
addition to the existing manual adjustments. Maybe I will have a try
at this.

cheers,

dylan