[GRASSLIST:700] Re: rectifying vector map

[David Orme]

Hi,

I've just been trying to do exactly this (with added complications that 
the vector data is in eps format and full of extra features that I need 
to get rid of...).

There is a command v.transform that will rectify a vector but it will 
only do 1st order transformations. If my understanding of 
georeferencing is right, then you should be able to create a location 
in the same projection as the vector map source and then a first order 
transform is all that should be needed. (If I've got this wrong can 
someone tell me!). Unfortunately, for my data we have no projection 
information on the vector graphics files and so I think I'm going to 
have to go down the rasterize, i.rectify, r.poly route..

David


On Friday, July 11, 2003, at 10:04  am, Moritz Lennert wrote:

> Hi all,
>
> Is it possible to rectify a vector map, i.e. import a map that was 
> drawn
> in x,y coordinates and then rectify it to a real projection system, or
> does one have to transform the map into raster and then use i.rectify ?
>
> Moritz
>