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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: |
Robert Heitzman |
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I think the DRGs are just scanned versions of paper maps. I don't think
they are even scans of the seperations used to make the orginal maps - could
be. Some are just better than others as to dpi, color, etc.
www.mapmart.com offers a custom scanning service up to 300dpi I believe.
>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?
>
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