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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: GISList: Differences in DRG Quads |
| Date: |
02/13/2002 07:37:17 AM |
| From: |
Glenn Letham |
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Jason,
quite often the various value-added programs that use USGS data are using
higher resolution data.
Basic or typical DRGs available from USGS, GISDatadepot, and others are
generally at 250 dpi, yet you may find 400 or 500 dpi data products from
other sources but at a higher price.
For DRG specs see
http://rockyweb.cr.usgs.gov/nmpstds/acrodocs/drg_temp/2drg0401.pdf
Regards
glenn
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
----- Original Message -----
From: "Jason Lampitt" <jlampitt@yahoo.com>
To: <gislist@geocomm.com>
Sent: Wednesday, January 30, 2002 1:53 PM
Subject: GISList: Differences in DRG Quads
> I'm sure someone out there has an answer to this
> question.
>
> I've downloaded a few USGS 1:24K quads from the USGS
> and then compared those quads to quads available in
> various software demo packages like Terrain Navigator
> Pro, National Geographic's TOPO! and others.
>
> Usually the quads represents the same information but
> visually the quads in the software packages are more
> appealing.
>
> How come?
>
> Jason Lampitt
> Trail TopoGraphics
>
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