11.A. Data and Source File-Naming Convention
To facilitate handling, GLOBE has been divided into 16 smaller pieces, or tiles.
One option for file naming would have been to include latitudes and longitudes in each tile. However, we wanted to include the version number of each data file. We also wanted to identify the G.O.O.D. versions of GLOBE (unrestricted data) and B.A.D. versions (best available data, but with noted restrictions). Both may exist for any given tile. In addition, we wanted to allow for the GZIP process which takes two characters from DOS (traditional PC 8.3 character) file names.
Finally, we wanted to be prepared for the Spatial Data Transfer Standard (SDTS), a set of standards designed for improved transfer of spatial data between computer systems. (Currently a developing standard in the U.S., it is being considered by the International Standards Organization for worldwide use.) SDTS only allows the data developer to use the first four characters of a file name. The other characters are reserved for naming the SDTS "modules" (that is, the transfer files).
In order to be SDTS compliant, we restricted the tile name to four characters. The file naming convention for the data and source files is as follows:
Note that all of the filenames on the CD-ROMs are stored in lowercase.