123 Coded Data Field: Latitude and Longitude (O;NR)

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, which , however is (currently) not supported in the CERL Thesaurus. A place is referenced by 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

The co-ordinates for a place are given as a centre point. However, in compliance with the Unimarc Authorities format, a distinction between the westernmost and easternmost longitude and northernmost and southernmost latitude is made when a record is rendered in the CT Internal Format. For editing it is sufficient to fill in subfields $d (longitude) and $f (latitude). Once a record is saved, subfields $e and $g, repeating the values given in $d and $f are added automatically.

The order of subfields within this field doesn't matter. It might be most convenient to enter coordinates this way:
123 ##$fn0513202$de0095608.

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

Internal Representation

{"data": {"location": {"point": {
    "long": "Longitude ($d)",
    "lat": "Latitude ($f)"
}}}}