[Xastir] MrSid format DRG maps

[Tom Russo]

On Tue, Oct 10, 2006 at 11:10:22AM -0400, we recorded a bogon-computron collision of the <shadow at dementia.org> flavor, containing:
> On Tue, 10 Oct 2006, Curt, WE7U wrote:
> 
> >On Mon, 9 Oct 2006, Bennett, Bruce wrote:
> >
> >>Does anyone just happen to be working on '.sid' support for xastir a the
> >>moment? It would be nice to save disk space for other needs by keeping 
> >>them
> >>in compressed form...
> >
> 
> >Some states have started making MrSID topo maps or perhaps DOQQ
> >images available for free.  Sometimes these are cropped USGS images
> >(no white border) as well.  Disks are cheap these days and I'd much
> >rather see them make the original unmodified files available for
> >download.
> 
> PA has unmodified DOQQs online (geotiff, bil or bsq) and they are 
> collarless, but i can find no evidence they're cropped.

USGS DOQQs are collarless to begin with in my experience.  Also, the MrSID 
versions of DOQQs available directly from USGS also have all the necessary 
metadata encoded in them so that when they're converted to geotiff (with the 
lizardtech converter) they're directly usable in xastir with no mods.

It's only states that take USGS data, massage them in ArcGIS, then compress 
them with MrSID where the DOQQs are unusable without special tweaking.

-- 
Tom Russo    KM5VY   SAR502   DM64ux          http://www.swcp.com/~russo/
Tijeras, NM  QRPL#1592 K2#398  SOC#236 AHTB#1 http://kevan.org/brain.cgi?DDTNM
"And, isn't sanity really just a one-trick pony anyway? I mean all you get is
 one trick, rational thinking, but when you're good and crazy, oooh, oooh,
 oooh, the sky is the limit!"  --- The Tick