[GRASS-user] <Q>How to add coordinate (x,y) data?

[Hamish]

Yasuo Shimada wrote:
> I want to add coordinate (x, y) data to point-vector-table.
> However, I do not know how to do it....
> 
> Normally, point-vector-table has not coordinate data.
> cat    elev
> 1     27.000
> 2     25.000
> 3     39.000
> 
> So, I used addcol command:
> v.db.addcol map=xx columns="x single"
> v.db.addcol map=xx columns="y single"
> 
> cat    elev   x    y
> 1     27.000 ....  ....
> 2     25.000 ....  ....
> 3     39.000 ....  ....
> 
> I want to add coordinate data into x, y columns.. for
> example;
> 
> cat    elev       x       y
> 1     27.000    139.6721 35.14625
> 2     25.000    139.6230 35.15768
> 3     39.000    139.6232 35.14543
> 
> However, I do not know how to do it....
> Please teach me how to add coordinate (x,y) data ?

v.db.addcol columns='x DOUBLE PRECISION, y DOUBLE PRECISION'
v.to.db option=coor columns=x,y


> I want to kriging analysis with R and library(gstat).
> I guess, Kiriging (gstat) needs a file including data and
> coordinate(x,y)data.

Someone else will have to answer that.


Hamish