[GRASS5] what projection is lat-long displayed in ?

[M Lennert]

On 23 Mar 02, at 13:27, Glynn Clements wrote:

> 
> M Lennert wrote:
> 
> > When using lat-long data and displaying it on the screen or printing
> > it with ps.map, in what projection is this data actually displayed
> > on these 2D media ? Is this hardcoded into Grass ?
> 
> There isn't any "projection" as such. Actually, GRASS in general
> doesn't really have much to do with projections; most operations work
> on abstract coordinates, without regard to whether they are degrees,
> metres etc.
> 
> When it comes to displaying data, GRASS maps coordinates to pixels
> such that the current region just fits within the active display frame
> while preserving the aspect ratio.

But it has to do so using some formula between lat-long coordinates and x-y 
pixels, no ?

Moritz