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Subject: Re: MAPS-L: Question about cataloging geologic maps
Date: Fri, 30 Sep 2005
From: Russell Guy <[log in to unmask]>
To: Maps, Air Photo & Geospatial Systems Forum <[log in to unmask]>
Nearly all large-scale (1:250,000 and larger) geology maps are compiled on
topographic base maps. In most cases the geology maps are published
showing the topographic base map, thus they have elevation contours
underneath the geology overprinting. In some cases the color of the
geology overprint is dark/heavy enough to obscure the contour lines but if
you look closely they are there.
Geophysical maps (Bouguer gravity anomaly, magnetic anomaly, etc.) nearly
always have isolines showing lines of equal value of whatever the topic of
the map. Structural maps and aquifer maps sometimes have isolines as well.
In these cases these isolines should be noted separately from elevation
contours.
Cheers
At 09:40 AM 9/30/2005, you wrote:
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>Subject: Re: MAPS-L: Question about cataloging geologic maps
>Date: Fri, 30 Sep 2005
>From: [log in to unmask]
>To: Maps, Air Photo & Geospatial Systems Forum <[log in to unmask]>
>
>
>I interpret Gwen's question differently than the others who've responded so
>far. I don't have a lot of experience cataloging geologic maps, but when I
>have cataloged them, there have been times when the same question has
>occurred to me. I'd be interested in Chris Thiry's take on it. Isn't Gwen
>saying that there are sometimes contours, or isolines, on geologic maps
>that are showing something that might not be relief? In other words, are
>"structure contours" showing a relief of sorts, or are they showing the
>depth of a certain rock structure? And if the latter is the case, then I
>would think it would be correct, as Gwen suggests in her second
>alternative, to leave the relief code blank, and to put the note she
>suggests: Structure shown by contours [or isolines].
>
>Nancy Kandoian
>Map Cataloger
>Map Division, New York Public Library
>
>
>
>
>
> "Angie Cope,
>
> AGSL" To:
>[log in to unmask]
> <[log in to unmask]> cc:
>
> Sent by: "Maps, Subject: MAPS-L:
>Question about cataloging geologic maps
> Air Photo &
>
> Geospatial
>
> Systems Forum"
>
> <[log in to unmask]
>
> UGA.EDU>
>
>
>
>
>
> 09/29/2005 10:27
>
> AM
>
> Please respond to
>
> "Maps, Air Photo
>
> & Geospatial
>
> Systems Forum"
>
>
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>
>
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>Subject: Question about cataloging geologic maps
>Date: Thu, 29 Sep 2005
>From: Curtis, Gwen <[log in to unmask]>
>To: Maps, Air Photo & Geospatial Systems Forum <[log in to unmask]>
>
>Could someone with experience cataloging geologic maps please advise me
>on something? When a geologic map shows structure by contour lines, is
>that considered relief? Should it be coded as "Relf: a" and described
>in a note as - Relief shown by contours? Or, do the codes for relief
>only pertain to topographic and bathymetric relief? Perhaps the note
>should be "Structure shown by contours" and the relief code left blank.
>What do you think?
>
>**********************************
>Gwen Curtis
>Geology Library and Map Collection
>University of Kentucky Libraries
>410C King Library Addition
>Lexington, KY 40506-0039
>
>Phone: (859) 257-1853
>Fax: (859) 323-3225
>Email: [log in to unmask]
>
>
>
>
>
>
>--
>
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Russell Guy [log in to unmask]
Vice President http://www.omnimap.com/maps.htm
Omni Resources Tel.: 800-742-2677 (USA only)
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