Updata Site/Data Descriptor Groups - Joseph P. Nielsen : ADAPS: Chapter 4.11 Miscellaneous Utility Functions
A site-data descriptor group is a collection of individual records, each of which is a concatenation of the agency code, site identifier, and data-descriptor number. This collection of data is stored in a Group File under ADAPS and is used primarily in data retrievals. The user can have more than one Group File with different sets of stations selected, each stored as a separate Group File, and probably will have several in order to have greater retrieval flexibility.
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