[GRASS5] v.support and large datasets (gshhs from GMT)

[Markus Neteler]

Hi Andreas,

On Fri, Dec 08, 2000 at 08:25:59PM +0100, Andreas Lange wrote:
> Hallo Markus,
> 
> koenntest Du vielleicht das Skript/Programm posten, mit dem Du die Daten
> konvertierst?
> Ich wuerde mir gerne den D'ld von 58 MB sparen, die GSHHS habe ich hier
> auf CDROM. 
Sure: I have put the sources of Simon Cox' convert program here:

ftp://www.geog.uni-hannover.de/outgoing/
gshhstograss.tar.gz

It's the program from Simon with a few additions (includes added) to
make it compile.
It reads the gshhs binary data files and outputs ASCII vectors.
Probably we should make a nice GRASS module from gshhstograss (r.in.gshhs)?

For details please refer to
ftp://gmt.soest.hawaii.edu/pub/wessel/gshhs/README

Cheers

 Markus

> Markus Neteler wrote:
> > 
> > Hi all,
> > 
> > to provide a high resolution vector coastline dataset I have
> > converted the
> >                         G S H H S
> >  Global Self-consistant Hierarchical High-resolution Shorelines
> >  from Paul Wessel and Walter. H. F. Smith
> >  (ftp://gmt.soest.hawaii.edu/pub/wessel/gshhs/).
> > 
> > A problem arises from v.support which doesn't run on large files (at all or
> > or in reasonable time, process is still running here). If you are interested
> > to test GRASS with a *large* vector file, I have prepared the GMT dataset
> > for you:
> > 
> > To describe it's resolution:
> > (From the GMT page:) The file gshhs_h.c (High resolution) is at 0.2 km, I
> > have converted gshhs_f.c (Full resolution) at 0.?km (no value given). So I
> > have converted the *full* resolution dataset gshhs_f to GRASS ASCII vector
> > format for you to download at:
> > 
> > ftp://www.geog.uni-hannover.de/outgoing/gshhs_f_grassascii.tar.gz (58MB)
> >  -rw-r--r--   1 neteler  users    226115131 Dez  8 17:42 dig_ascii.gshhs_f
> >  -rw-r--r--   1 neteler  users    10561544 Dez  8 17:42 dig_att.gshhs_f
> >  -rw-r--r--   1 neteler  users     2166637 Dez  8 17:42 dig_cats.gshhs_f
> > 
> > You can use this lat/long world coastline dataset within "global dataset"
> > location which you get from here (or you define an empty world lat/long
> > location):
> > 
> > http://www.geog.uni-hannover.de/grass/data.html
> > Add the missing directories:
> >  $LOCATION/dig_ascii
> >  $LOCATION/dig_cats
> > 
> > and move the files into their directories (rename to gshhs_f or similar of
> > course). Then
> >  v.in.ascii in=gshhs_f out=gshhs_f
> >  v.support gshhs_f op=build
> > 
> > However, this takes muuucchhh time... Does anyone see a chance to speed
> > up the v.support topology build function? Maybe it would be useful to
> > add progress output (percentage) to v.support.
> > 
> > Regards
> > 
> >  Markus
> > 
> > ----------------------------------------
> > If you want to unsubscribe from GRASS Development Team mailing list write to:
> > minordomo at geog.uni-hannover.de with
> > subject 'unsubscribe grass5'
> 
> -- 
> Andreas Lange, 65187 Wiesbaden, Germany, Tel. +49 611 807850
> Andreas.Lange at Rhein-Main.de - A.C.Lange at GMX.net
> 
> 

-- 
Dipl.-Geogr. Markus Neteler *  University of Hannover
Institute of Physical Geography and Landscape Ecology
Schneiderberg 50 * D-30167 Hannover * Germany
Tel: ++49-(0)511-762-4494  Fax: -3984

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