3 messages.-------------------------------Johnnie
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: Thu, 01 Jun 95 11:14:06 EDT
: HelenJane Armstrong <[log in to unmask]>
: Quadrangle Count
The University of Florida Map & Imagery Library cataloged all of our USGS
1:24,000 topographic quadrangles during a two month period. We cataloged the
quadrangles by state using the 127 collective (parent) records available on
OCLC. As part of this project and for internal purposes a detailed count was
made of all current editions at the 1:24,000 scale. The figure as of July,
1994 was 67,351 topographic quadrangles This figure does not include older
editions, topos at other scales, or duplicates. If a source is needed to
cite this figure you can find it on page 32, of "An Academic Map Library
Loads GPO Cataloging Tapes: A Case Study of Plans and Impacts" in the September
1994 issue of the "Bulletin" of the Special Libraries Association Geography
and Map Division pp2-33.
A side note to this issue might be of interest to some of you. Several years
ago a representative from US Geological Survey called our library to inquire
how many flat map cases/drawers were needed to house the University of Florida'
collection of old and new edition topographic quandrangles. As the Regional
Depository for the state we have kept all editions of all the topographic maps
and could give them a good estimate for their equipment needs. I found it
curious that an accurate count of how many different editions were published
for each quadrangle was not readily available to the USGS library.
Hope this helps fills needs for an accurate count of topographic quadrangles.
HelenJane Armstrong, University of FLorida Map & Imagery Library.
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: [log in to unmask]
: Tue, 30 May 1995 11:38:00 -0700
: Re: QUADRANGLE COUNT?
----------------------------Original message----------------------------
Does anyone out there have a count of how many quadrangles make up the
complete set of USGS 7.5-minute topographic maps? We have just finished
"reading" our 44 drawers of these and are half done marking new index maps.
We want to get a more accurate handle on how many we actually have, without
having to physically count them all.
1:24,000 (7.5) = 53,700 (excluding Alaska)
1:62,500 (15) = 3,069 (excluding Alaska)
1:63,360 (15) = 2,920 (Alaska)
1:100,000 (1/2x1) = 1,825
1:250,000 (1x2) = 626
source: USGS, In: World Cartography, Volume XVII, (New York, United
Nations, 1983), p. 31, column "required for complete
coverage."
Backfile estimates: (7.5 + 15 + 250k) = ca. 440 rolls of microfilm at
average 500 images per roll = 220,000 sheets. This set
contains superseded sheets only.
We speeded our inventory by sampling all of the "USGS catalog of
published maps" for Arizona. We avoided a California sample
because it would always be a special case, so we used the
adjacent state most likely to be average in depository
receipts and pilfering. Result was virtually 100% match
between holdings and the catalog list. We then assumed all
other states were that complete, and established a
notification system for patrons to inform us of missing
quads.
Elapsed time was still near 80 hours for the project, which
included marking the holdings for all states (insisted on by
the depository inspector). It was not difficult to benchmark
at the time because pub. dates were included for all
published sheets; monthly USGS pubs lists were used to
update, or the monthly lists were kept in the same catalog
rack and a few sampled the same way to derive an estimate
for all.
Since
shifting to microfilm, we're depending on the USGS MCIS
fiche inventory (ca. 1989, available from USGS) which is
also contained in Chris Baruth's GEODEX map series sheet
inventory. i'd like to link GEODEX to our OPAC as a subset,
since its scope is global and its access points superior to
any existing OPAC. it's easily added to, is cooperatively
updated and is the most complete sheet inventory for the
U.S. (and every other country). We are currently
investigating its use as a quad-based inventory for earth
science mapping and air photos.
Two
problems exist: freeing Chris to upgrade GEODEX into
Windows, Windows NT or Unix, and using an OPAC link
developed by our slide collection so GEODEX can be accessed
as a specified subset of our main catalog. Since series map
sheet-level titles are problematic when free-floating in an
on-line book catalog, I see this as a more useful approach.
LC
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: Tue, 30 May 1995 17:32:57 -0400 (EDT)
: "James Lutz" <[log in to unmask]>
: Re: QUADRANGLE COUNT?
Sue,
We have 56,810 as the number of 7.5 minute quads available. We discovered this
figure was slightly inflated from counting some of the quads twice. This
occured because of quads listed in multiple state indexes. This number will
probably reduce down to 55,000. If you get an accurate number let us know,
thanks.
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James Lutz [log in to unmask]
Wise Library
Government Documents/Maps Phone: (304) 293-3051
West Virginia University Fax: (304) 293-6923
PO Box 6069
Morgantown, WV 26506
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