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USGS/EDC Archive Preservation Status An Update Stuart Doescher, USGS (Cheryl Greenhagen)

USGS/EDC Archive Preservation Status An Update Stuart Doescher, USGS (Cheryl Greenhagen) W GISS-19 March 2005 Cordoba, Argentina. TM and MSS Archive Conversion System (TMACS). Operations: 1992 to 2002. Number of High Density Tapes (HDT) transcribed: 32,300 Landsat MSS, TM

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USGS/EDC Archive Preservation Status An Update Stuart Doescher, USGS (Cheryl Greenhagen)

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  1. USGS/EDC Archive Preservation Status An Update Stuart Doescher, USGS (Cheryl Greenhagen) WGISS-19 March 2005 Cordoba, Argentina

  2. TM and MSS Archive Conversion System (TMACS) • Operations: 1992 to 2002. • 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)

  3. WBVT summary • Operated: April 1999 - 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) save on 172 DLTs • Bad input tapes: 476 (even with cleaning & baking).

  4. SPOT summary • Operated: late April 2000 - February 2002 • Number of HDTs converted: 6,100 • Number of DLT 7000 tapes generated: 901 • Format: MDA's FRED

  5. Landsat Archive Conversion System (LACS) • Planned Operations: June 2004 – June 2006 • Input: About 6000 HDTs, 4000 DCTs, plus current Landsat 5 data • Output: ~ 1000 tapes of "formatted" data and ~ 1100 tapes of "raw" data on 9940B. (200G/tape) • Format: BSQ

  6. LACS Description • Ingest current Landsat 5 data from disk files • Ingest data 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.

  7. Data to be converted by LACS

  8. Current LACSConfiguration

  9. LACS Status • Started Operations: June 2004 • Progress to Date: (January 2005) • Current Landsat 5 Data: 949 Intervals (22,061 scenes) • DCTs: 318 Tapes (2,809 Intervals, 53,697 scenes) • HDTs: 2624 Tapes (2,846 Intervals, 52,203 scenes) • This is 105,900 of 1,040,812 scenes in 6 ½ months (Implies total time greater than 5 years with 4.5 years remaining - that would imply a July 2009 completion)

  10. LACS Status • LTS (LACS Transcription Subsystem) 3 Strings: • LTS1: Current Landsat 5 data only (acquired at EDC, or received on DLT from Australia.) • LTS2: DCT Input ( 2 to 3 shifts per day) • LTS3: HDT Input. (1 to 2 shifts per day) Tapes (HDTs) & tape drives (HDTRs) are cleaned before use Many of the HDTs are baked Some HDTs are tried many times before success HDTRs may require adjustment for specific sets of tapes

  11. LACS Status • LIS (LACS Integration Subsystem) 1 String: • Performs Automated Cloud Cover Assessment, Browse Generation, Quality Assignment • Provides Interactive Assessment Capability • Gives priority to current Landsat 5 data • This system is currently the bottleneck

  12. LACS Status • Issues / Problems: • Some tapes in very poor condition • LIS performance needs improvement • Plans: • Continue to improve handling of poor-quality data • Performance Improvements: • Run LIS on 3 Linux systems • Run DCT Ingest on 2 LTS systems • Run DCT Ingest on 3 LTS systems when HDTs done • Anticipate 3 time improvement (1.5 years remaining that would imply a July 2006 completion)

  13. Planned LACS Configuration

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