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UNAVCO 1996 Annual Report

C.1 UNAVCO Archive Status

The purpose of the UNAVCO Boulder Facility Archive is three-fold. First, it serves as physical storage for the PI who is primarily responsible for the GPS data collection. Second, it serves as a near on-line repository of GPS data for the present GPS community. Third, it serves as a long-term archive for future researchers who may want to search, identify, and recover validated GPS data and metadata at earlier precise positions, in a specific spatial or temporal frame of interest. Not coincidentally, these three functions translate into the three primary components of the UNAVCO Archive (Figure C-1), more completely described in the 1996 Annual Report. The present state of these three components of the Archive is as follows:

    • Physical Repository: The Physical Repository includes project media (e.g. floppy disks, tapes, etc.), field log sheets, maps, photographs, and other physical records. The total number of NSF episodic projects in the Physical Repository is now 98, representing about 25 Gbytes of data and several thousand pages of paper logs and records.
    • On-line Repository: Data and associated metadata are stored on a 16-Gbyte RAID disk system and/or a 500-Gbyte Digital Linear Tapedrive (DLT) jukebox which was purchased and installed with an AMASS virtual file system in FY97. About 11 Gbytes of episodic data and 7 Gbytes of permanent station data are currently on-line.
    • Archive Database: Validated data and metadata (using log sheets, shipping invoices, PI notes, and other sources of information) are organized, manually entered, and accessed via an Oracle relational database management system (RDBMS). A master index of 225 projects, 144 of which are NSF-supported projects spanning 1985-1997, resides in the Archive Database. Data from more than 72 NSF projects have now been completely archived so that individual data files and metadata are accessible on-line. There are now 1800 monuments, 6000 site visits and 18000 data files from NSF-supported projects completely archived.

Figure C-1. UNAVCO Archive Operations.

Archiving of Campaign Data in FY97

In FY97, data from 38 NSF projects were completely archived (Table C-1). A preliminary list of 45 projects has been compiled for archiving in FY98 (Table C-2). Additionally, 50 older NSF projects were identified for which no data have been submitted to the Boulder Archive (Table C-3). The responsible principal investigators for these projects were contacted in 1997 by Facility staff and efforts will be made to obtain and archive as much of this data as possible in FY98. The process of organizing and recovering older campaign data was assisted by the University of Miami and the University of Texas-Austin which will continue in FY98.

Table C-1: NSF Campaign Projects Archived in FY97

Table C-2: NSF Campaign Projects Planned for Archiving in FY98

Table C-3: Outstanding Projects Targeted for FY98

Permanent Station Data Management and Archiving in FY97

In FY97, several prototype methods for delivering and automatically archiving data from permanent stations were developed and applied to several test sites. This included implementing UNAVCO's new receiver downloading software (LAPDOGS) and data transfer methods such as UCAR/Unidata's Local Data Manager/Internet Data Distribution (LDM/IDD), continuous VSAT transmission, and Internet ftp. As with project data, part of the Facility's responsibility is to identify new NSF-supported permanent stations and to facilitate data transfer to the UNAVCO Archive. At the close of FY96, seven NSF-supported permanent stations were sending data to the Boulder Archive. By close of FY97, 35 permanent stations will be contributing data. This number is expected to increase by another 60 stations during FY98, for a total of 95 stations (Table 7 of main report). The influx of new stations reflects the increase in GPS receivers made available to the community via the 170+ GPS receivers purchased under the NSF ARI grant. The total data (raw and RINEX) archived from each site is ~ 3 to 4 Megabytes/day. The annual volume of data from the 90+ stations will be over 100 Gbytes/year by the end of FY98 and will be accommodated on the Boulder Archives new 500 Gbyte DLT virtual file system.

1997 Annual Report - 27 OCT 1997


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