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

USGS/EROS Archive Preservation Status Update Stuart Doescher, USGS (Cheryl Greenhagen) W GISS – 24 October 15-19, 2007 Oberpfaffenhofen, Germany. TM and MSS Archive Conversion System (TMACS). Operations: 1992 to 2002. Number of High Density Tapes (HDT) transcribed: 55,503

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

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  1. USGS/EROS Archive Preservation Status Update Stuart Doescher, USGS (Cheryl Greenhagen) WGISS – 24 October 15-19, 2007 Oberpfaffenhofen, Germany

  2. TM and MSS Archive Conversion System (TMACS) • Operations: 1992 to 2002. • Number of High Density Tapes (HDT) transcribed: 55,503 • Landsat MSS, TM • Number of DCRSi Cassette Tapes (DCT)s output: 3,827 • 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 – December 2006 • Input: About 5600 HDTs, 4000 DCTs, plus current Landsat 5 data • Output: ~ 1200 tapes of "formatted" data and ~ 1350 tapes of "raw" data on 9940B. (~180G/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. LACS Status • Started Operations: June 2004 • Progress to Date: (August 31, 2007) • Routine transcription completed December 2006 • Data anomalies and problem tapes still being worked, on a part-time basis

  9. LACS Configuration

  10. LACS Status • LTS (LACS Transcription Subsystem) • LTS work is performed by two strings • LTS 1 Transcribes Landsat data from DCT, and Current Landsat 5 data (acquired at EDC or GLC, or received on DLT from Australia) • LTS3 Transcribes Landsat data from HDT or DCT • LTS2 and LTS4 have been retired

  11. LACS Status • LIS (LACS Integration Subsystem) • Performs Automated Cloud Cover Assessment, Browse Generation, Quality Assignment • Provides Interactive Assessment Capability • Gives priority to current Landsat 5 data • LIS work is distributed across 2 strings • LIS3 has been retired

  12. LACS Status • Issues / Problems: • Data anomalies, tape degradation, cross-play issues • DCRSi and HDTR tape drives require frequent cleaning and maintenance • Plans: • Complete work on anomalous data and problem tapes

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