During the accessioning process, NODC created files to include
as additional metadata for this data collection. These files include a
list of all latitude-longitude pairs for observations, graphical plot(s)
of all data locations in the .jpg format. 

The accession number assigned by NODC is depicted in each file name as
#######. The files use the following naming conventions:
#######_lonlat.txt - this file is created by extracting the longitude
and latitude values for all station locations in the data. The list of
longitude-latitude pairs is then processed to remove duplicate stations
and to reformat the values to decimal degree formats, if necessary. The
left column contains longitude values, the right column contains
latitude values. In accordance with FGDC guidelines, North latitude and
East longitude are positive values, South latitude and West longitude
are negative values. 

#######_map.jpg - this JPEGfile was created by plotting the values in
#######_lonlat.txt using the unix plotting software Generic Mapping
Tools (GMT). 

For more information
about GMT, please see http://gmt.soest.hawaii.edu/(last accessed on
2007-05-24). 
