USGS/EDC Archive Preservation Status Stuart Doescher, USGS WGISS-17 May 2004 Tromso, Norway
TM and MSS Archive Conversion System (TMACS) Operations: 1992 to Number of High Density Tapes (HDT) transcribed: 32,300 –Landsat MSS, TM Number of DCRSi Cassette Tapes (DCT)s output: 3,200 Mostly in Telemetry stream format (Frame sync required to read)
WBVT summary Operated: April May 2002 Number of HDTs converted: 21,300 Number of Digital Linear Tape (DLT 7000) generated: 143 and an additional 143 as backup Format: BSQ ( MSS-X) "orphan" data (no DIAT / SLAT) : 172 HDTs Bad input tapes: 476 (even with cleaning & baking).
SPOT summary Operated: late April February 2002 Number of HDTs converted: 6,100 Number of DLT 7000 tapes generated: 901 Format: MDA's FRED
Landsat Archive Conversion System (LACS) Planned Operations: June 2004 – June 2006 Input: About 6000 HDTs, 3500 DCTs, Output: ~ 600 tapes of "formatted" data and ~ 700 tapes of "raw" data on 9940B. (200G/tape) Format: BSQ
Landsat Archive Conversion System (LACS) Ingest from DCRSi Cassette Tapes (DCTs) –Multispectral Scanner Archive format (MSS-A) data –Multispectral Scanner Product format (MSS-P) data –Thematic Mapper Archive format (TM-A) data –Thematic Mapper raw (TM-R) data Ingest TM-R data from High Density Tapes (HDTs) Archive the data to a high-density computer-compatible digital tape: 9940B Generate and archive browse imagery Generate inventory information for the new archive.
Data to be converted Data Set Number of Scenes Number of TapesData Volume MSS-P65, DCTs 3.2 terabytes MSS-A262, DCTs 9.5 terabytes TM-A13, DCTs 3.6 terabytes TM-R (1982 – 1994)513,514 2,967 DCTs terabytes TM-R (1995 +)106,300 5,500 HDTs 27.5 terabytes TM-R (new)~ 8 terabytes Total179.3 terabytes
Digital Archive Earth Explorer Landsat Production Database LACS Browse Generation System LBGS LACS Database System – Part I LDBS-I LACS Database LDB LACS Tape Tracking and Assessment System LTTAS LDBS-II LACS Database System – Part II Metadata Handler LDBS-III LACS Database System – Part III Tape Labeling Software TLS LTS LACS Transcription System EE Browse Images HDTs, DCTs Master 9940B Working Copy 9940B Browse Tape EE Browse Images Label Information Metadata Historic Scene Info All LDB Info Updated Tables Scene Tables Updated Tables Job Histories, Metadata Interval Tables, Scene Tables, 9940B Tables Browse Metadata DORRANNLAPS 9940B Tapes Order Information Working Copy 9940B Label Information Updated Metadata LACS Duplicator System LDS Transcription Operators Assessment Operators Production Control LACS Context Diagram