[GRASS5] Algorithm i.rectify[2] ?

[Angus Carr]

The norm for rectifying imagery is a cubic or bilinear convolution. The
norm for rectifying class rasters is a nearest neighbour. Having nearest
neighbour available is necessary, but adding other forms as command line
options would be ideal.

Angus.

Markus Neteler wrote:
> 
> On Wed, Apr 25, 2001 at 11:21:04AM -0400, Angus Carr wrote:
> > It is nearest neighbour only.
> >
> > I looked into this at some past point, around version 4.1/4.2, I think.
> > I doubt anyone has changed it.
> >
> Hi Angus,
> 
> thanks for clarification. What do you think: Can we live with that?
> Probably an interpolating algorithm would produce smoother results?
> But I am not sure what's preferred.
> 
> Regards
> 
>  Markus
> 
> > Markus Neteler wrote:
> > >
> > > Hi again,
> > >
> > > a colleague of mine wanted to know how pixel values are treated
> > > in i.rectify[2]. Is it a nearest neighbour algorithm or does it
> > > calculate an average of neighboured pixels if they fall into one
> > > resulting cell? To be honest, I don't understand this from the
> > > sources.
> > > Once we know a note should be added into the related html pages
> > > (of course I can do that).
> > >
> > > Thanks for any help,
> > >
> > >  Markus
> > >
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> 
> --
> Markus Neteler *  University of Hannover
> Institute of Physical Geography and Landscape Ecology
> Schneiderberg 50 * D-30167 Hannover * Germany
> Tel: ++49-(0)511-762-4494  Fax: -3984
> 
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