[GRASSLIST:7712] Re: Raster placement coordinates formatting

[Glynn Clements]

Bart wrote:

> I've been testing my export code and hit on a problem,
> namely the referencing of rasters that I export.
> Right now I do an r.out.ascii and read the header, 
> which essentially gives me the data from the cellhd
> directory, specifically north, east, south and west
> for a map.
> 
> I would like to know what is the various formats 
> these can be in, and specifically how negative values
> are encoded in each and what non-number data
> may be in there.

For anything other than lat/lon, the bounds are formatted using
sprintf("%.8f") with trailing zeros removed.

For lat/lon, the bounds are in DMS, with one of the forms:

	01:23:45.678N
	01:23:45N	(seconds are integral)
	01:23N		(seconds are zero)
	01N		(minutes & seconds both zero)

> The variation seems to stem from 
> the proj element, which can apparently be 
> unreferenced (0), UTM (1), state plane (2) and
> lat-long (3). Is this true?

Yes. Also, the projection can be 99 (other).

-- 
Glynn Clements <glynn at gclements.plus.com>