[GRASSLIST:5260] Re: MrSID file import into GRASS and ... ?

[Kevin Slover]

My 2 cents worth,
	My experience with the MrSid viewer was somewhat different from what
Lowell is saying.  I used a WIN based MrSid viewer to export the image
as a TIF with corresponding TFW file.  It worked quite well, except for
one problem.  The TIF image game to be drastically larger than the SID
file, obviously because of the compression.  And with my luck, was not
the most convenient to open with GRASS (be it the file size, or my
computer speed).  I was dealing with TIF sizes of 1GB plus.  Not the
best for using in GRASS!!

Good luck!

Lowell Filak wrote:
> 
> Supposedly you can use the MrSID viewer to open each one of the sid files and then save it as a Tiff and then copy the sdw file to tfw or wld and end up with a Tiff with a world file.
> If you decide to try doing that you may want to do a test first.
> My direct experience was less than pleasing using the Linux MrSID viewer.
> We were given some sid files from a neighboring county and from the original 0.5' pixel image the best we could get was 8' pixels because the viewer does not "export" the original image but rather appears to snap-shot the current screen view.
> It is possible that other versions of the viewer (for different OS's) work differently, although it does not say that on the download site, so your mileage may vary.
> HTH
> Lowell
> 
> The following message was sent by Allen Wilkinson <aw at apk.net> on Wed, 1 Jan 2003 18:21:22 -0500 (EST).
> 
> > I am trying to get some DOQQ files of Ohio to import into GRASS. All I
> > find for free is MrSID files. Does or will GRASS support MrSID files?
> >
> > If not, does nayone know of GeoTiff DOQQ ifles for Ohio?
> >
> > Thanks, Allen
> > --
> > Address:
> >
> > Allen Wilkinson                       (phone) (216) 382-7613
> > 1036 Pembrook Road                    (work)  (216) 433-2075
> > Cleveland Heights, OH 44121  USA      (INTERNET) aw(at)apk(dot)net
> > +++++++
> > "Nonviolence is a powerful and just weapon, which cuts
> > without wounding and ennobles those who wield it.  It is a
> > sword that heals."
> >
> > -- Martin Luther King, Jr.

-- 
LTJG Kevin Slover, NOAA
GIS Specialist/Oceanographer
NOAA/TPC/TSB/Storm Surge Unit
11691 SW 17th Street 
Miami FL  33165

W (305) 229-4456