[GRASS-user] Georeferencing vectors and r.thin

[Maciek Sieczka]

On Fri, 23 Jun 2006 18:07:51 +0200
"Juan Daniel López Serna" <jjuanda at gmail.com> wrote:

> Hello,
>     I'm trying to georeference a chart in PDF into a lat-long
> location. I first convert it into JPG,

Wouldn't be some non-lossy format better, eg. PNG?

> import it into the unreferenced location using r.in.gdal and so on
> (as seen on the tutorial). I need to digitize most lines of the
> original chart and it looks tedious. I've tried using r.thin (to
> convert it to vector with r.lines)

You mean r.to.vect feature=line, right?

>, but I get the following:
> 
> GRASS 6.0.2 (lemd):~/a > r.thin input=a_rect output=a_lines
> File a_rect -- 3333333 rows X 3333333 columns
> (null):  open_file:  error writing temporary file

There have been several fixes to r.thin this year in Grass 6.1. Can you
try a 6.1 CVS snapshot (I don't think that these days it is any less
stable than 6.02, yet much more featurefull and has many bugs fixed,
which are still present in 6.02).

Maciek

------------------------------------------------------------------------
CIEPŁE KRAJE - CIEPŁE MORZA. Szukasz atrakcyjnego wypoczynku w przystępnej cenie, zapoznaj się z naszą ofertą.
ZAPRASZAMY

www.skarpatravel.pl