[aprssig] Re: APRSpoint and other map sources

Mark A. Lewis mark at siliconjunkie.net
Thu Dec 2 17:01:43 CST 2004

I did some quick looking, it is fairly compressable as far as I can
tell. The TIF files compress about 50%.

Someone said something about 6 CDs? If so, that's about 4 gigs. If it
will compress, we can get it down to 2.5ish. As long as we can keep it
under 10-15 gigs, I would be willing to do this. 

-----Original Message-----
From: Scott Miller [mailto:scott at opentrac.org] 
Sent: Thursday, December 02, 2004 4:09 PM
To: Curt Mills, WE7U; TAPR APRS Mailing List; Jason Winningham; Mark A.
Subject: Re: [aprssig] Re: APRSpoint and other map sources

CA is likewise a huge data set.  Available here at two mirror sites:


They're all in Albers equal-area projection, though.  I've got around 20
GB of DRGs and DOQQs downloaded for my home county.

----- Original Message -----
From: "Curt, WE7U" <archer at eskimo.com>
To: "Jason Winningham" <jdw at eng.uah.edu>; "Mark A. Lewis"
<mark at siliconjunkie.net>; "TAPR APRS Mailing List"
<aprssig at lists.tapr.org>
Sent: Thursday, December 02, 2004 1:51 PM
Subject: Re: [aprssig] Re: APRSpoint and other map sources

> On Thu, 2 Dec 2004, Jason Winningham wrote:
> >
> > On Dec 2, 2004, at 3:40 PM, Curt, WE7U wrote:
> >
> > > What I'd like to see is a repository for the SDTS contour files,
> > > downloaded off the USGS site onto some other server.  Same for any
> > > USGS geoTIFF topo images.
> >
> > Any idea how much disk space we're talking about?
> A lot.  For the USGS geoTIFF topo maps, there are around 30 CD's,
> which cover the 7.5', 1:100k, and 1:250k, with a few others
> sprinkled in here and there.  That's a lot of space, and that's just
> for WA.  Most of the CD's aren't full, but it's still a lot of
> space.
> I'm not sure about the SDTS contour files.  Haven't looked at the
> files themselves in a while.  They should be quite a bit smaller.
> We already have the Tiger 2003 files, converted to Shapefiles,
> available on a server for APRS use.  Same for the Canadian topo
> maps.
> --
> Curt, WE7U.   APRS Client Comparisons: http://www.eskimo.com/~archer
> "Lotto:    A tax on people who are bad at math." -- unknown
> "Windows:  Microsoft's tax on computer illiterates." -- WE7U
> "The world DOES revolve around me:  I picked the coordinate system!"
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