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123 Coded Data Field: Latitude and Longitude
| Mandatory: | no |
| Repeatable: | no |
Field Definition and Scope
This field contains the geographic co-ordinates of the place described in the given record. It may occur only in records for place names.
In accordance with Unimarc Authorities, the format provides for referencing a rectangular shape, although it is customary in the CERL Thesaurus to reference places as a single point.
Application of Content Designators
Indicators
both indicator positions are undefinded and therfore left blank
Subfields
$d Westernmost Longitude (NR)
The longitude of the western boundary of the rectangle circumscribing the described place
$e Easternmost Longitude (NR)
The longitude of the eastern boundary of the rectangle circumscribing the described place
$f Northernmost Latitude (NR)
The latitude of the northern boundary of the rectangle circumscribing the described place
$g Southernomst Latitude (NR)
The latitude of the southern boundary of the rectangle circumscribing the described place
Each subfield is fixed at 8 characters and contains the following data:
| Character Position | Definition | Content |
|---|---|---|
| 0 | A one-character code indicating the Hemisphere | w = west e = east n = north s = south |
| 1-3 | Degree | 3 numeric characters, right justified and zerofilled |
| 4-5 | Minute | 2 numeric characters, right justified and zerofilled |
| 6-7 | Second | 2 numeric characters, right justified and zerofilled |
Input Conventions
When the co-ordinates for a map or plan are given in terms of a centre point rather than outside limits, the longitude and latitude that form the central axes are each recorded twice, in subfields $d and $e (longitude) and subfields $f and $g (latitude).
Mapping
To create an RDF description, the following mapping is applied
| $d | wgs84_pos:long |
| $f | wgs84_pos:lat |
- wgs84_pos represents the namesapce “http://www.w3.org/2003/02/geo/wgs84_pos#”
- the numerical values of the co-ordinates are represented as decimal fractions
- the vocabulary used is Basic Geo (WGS84 lat/long) Vocabulary http://www.w3.org/2003/01/geo/
Mapping Example
<rdf:Description rdf:about="http://thesaurus.cerl.org/cnl00016172"> <wgs84_pos:lat>48.8700</wgs84_pos:lat> <wgs84_pos:long>2.3300</wgs84_pos:long> </rdf:Description>
Example
123 ##$de0095625$ee0095625$fn0513143$gn0513143
215 #1$aGöttingen$cDE$5GYMG
