Intern:EXPOCODE

The EXPOCODE consists of
 * 1) the two digit NODC country code; e.g. for Germany = 06 or USA = 32
 * 2) an NODC defined abbreviation of the vessel consisting of letters and/or numbers; e.g. for Meteor (1986) = MT or Nathaniel B. Palmer = 06
 * 3) the date of the first day of the cruise in the format JJJJMMDD
 * Example for a cruise of the US research vessel Nathaniel B. Palmer, starting on 2011-02-19: 320620110219

Attension! There is a slight difference for research vessels from Germany using the ships own cruise label in a modified form instead of the start date - examples: If the cruise is part of an international project and the EXPOCODE is used, it should be added to the Campaign table by using the Optional label field.
 * cruise M15/3 of the Germany research vessel Meteor: 06MT15_3
 * cruise ANT-XV/4 of Polarstern: 06AQANTXV_4

In the EU-project Eurofleets a new convention for cruise naming was developed:
 * Naming cruises (Survey/Cruise Id): (SDN ship Code)+(yyyyMMdd start survey date).
 * Example: 29HE20101223 is the name of a survey onboard BIO Hesperides research vessel starting 23 of December 2010.
 * Naming CSR: Same as cruise Id with “_csr.xml” extension.
 * Naming CDI: (Cruise Id) _(leg, sample or station name)_(instrument name)+xml Example: 29HE20101223_station1_ctd.xml (CTD of station1 from Hesperides starting 23-12-2010 cruise).

Der Expocode ist ein eindeutiger cruise identifier, bestehend aus einem Laender code, einem Schiffscode und dem Datum der ersten Messung. Beispiel fuer Polarstern:
 * 06 (Deutschland)
 * AQ (Polarstern)
 * 19940817 (yyyymmdd)
 * original cruise label(?) (ANTX_5 = event label problem!, correct wäre ANT-X/5)
 * = 06AQ19940817 Beispiel:

Eintrag im Feld 'optional label'; zukünftig ev eigenes Feld in 4D und in den Metadaten des Events. Beispiel: Campaign: ... Expocode: ... Basis: ... etc.

In der Ozeanographie wird der Expocode insbesondere in neueren Datensammlungen häufiger verwendent.