--- Begin Forwarded Message ---
Date: Tue, 12 Jun 2001 15:44:13 -0500
From: Karen Fite <[log in to unmask]>
Subject: Map searching in a library catalog
Sender: Karen Fite <[log in to unmask]>


Map Searching in Web Voyage

        Come to http://catalog.odl.state.ok.us/webvoy.htm
Click on “Local Catalog” and then click on  “Map Searching”
and try out the Endeavor Map search on Web Voyage.  The Oklahoma
Department of Libraries is testing the usefulness of this search
approach and would like feedback on your thoughts.  Please send your
comments to:
[log in to unmask]

              Searching for maps in Web Voyage is limited to searching
the
“034” field of the OCLC cataloging record which contains information on
latitude, longitude, and map scale. Records from the Oklahoma Geological
Survey don’t contain a “034” field so one must be added if those records
are to be made searchable. US Geological Survey, US Forest Service, and
CIA maps all have this catalog field included in the records we have
purchased from Marcive.

              There are 5 different approaches to entering a search.
There is a “help” screen for map searching. One problem is that a search
will include all maps that contain the longitude and latitude parameters
used so even using a rectangle number from a 034 field with a “Shoe” of
MBR or Minimum Bounding Rectangle will produce a list of hundreds of
maps.  In order to reduce the number of hits you need to use the “limits
for maps” which are in the lower portion of the limits list. To limit to
7.5 minute for instance you put in a limit of 24000 so this will reduce
the search results. The trick is if you don’t impose the limits before
you put in your search the search will be removed after the limits are
entered and must be typed in again.

Latitude (Horizontal or North-South Lines) are represented by the
direction North(n) or South(s) followed by a seven digit number if you
are using “Format Type” Degrees/min/sec. Example:  n0385230 (Degrees
less than 100 must be given a leading zero)

Longitude (Vertical or East-West Lines) are represented by the direction
East(e) or West(w) followed by a seven-digit number if you are using the
same Format Type.  Example:  w0893730


RECTANGLE searching uses a pattern to put in the edges of the rectangle.

Using the letters from the latitude and longitude in the “034” field it
follows the pattern :  g/d  :  f/e
Assuming the limits have been entered first you may get hits in the
10-20
Range instead of 200-400. A sample search is :

Rectangle Search
                                    Lower Left
Upper Right
                               Latitude n0384500               Latitude
n0385230
                               Longitude w0893730            Longitude
w0893000











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