[GRASSLIST:7054] Re: r.to.pg

[Otto Dassau]

Am Dienstag, 7. Juni 2005 14:13 schrieb orkun:
> Otto Dassau wrote:
> >Am Dienstag, 7. Juni 2005 12:33 schrieb orkun:
> >>hello
> >>
> >>*Where can I find r**.**to**.**pg script to download from ?
> >
> >Maybe someone using GRASS 5.3 or 5.4 can provide it.
> >
> >>regards
> >>* <http://www.grass-gis.de/dassau/r_cross_pg/r.cross.to.pg.html>
> >
> >-> now available again...
> >
> >       Otto
>
> thank you
>
> I think in grass6 raster to vector does what r.to.pg does internally.

Hi,

right! you can convert the raster map into vector format and write all 
attributes into PostgreSQL. But there is a difference: r.to.pg writes each 
pixel value to the table, r.to.vect writes feature (points, lines, polygones) 
attributes. 

I guess, it depends on what you want to do. Some years ago, I needed raster 
pixel values to be able to calculate statistics with R from PostgreSQL table 
entries -> that's why r.to.pg was necessary and useful to me.

best wishes
   Otto