1. USGS/EROS Archive Preservation Status Update Stuart Doescher, USGS (Cheryl Greenhagen) WGISS – 22 Sept 11- 15, 2006 Annapolis, MD USA

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 5500 HDTs, 4000 DCTs, plus current Landsat 5 data Output: ~ 1100 tapes of "formatted" data and ~ 1200 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 Data Set Number of Scenes Number of TapesData Volume MSS-P65,128 118 DCTs 3.2 terabytes MSS-A262,088 277 DCTs 9.5 terabytes TM-A17,000 108 DCTs 3.6 terabytes TM-R (1982 – 2005)550,000 3,320 DCTs 140 terabytes TM-R (1995 – 2002)97,250 5,444 HDTs 27.0 terabytes TM-R (new)~ 14 terabytes 1,031,762 Total~200 terabytes

8. LACS Status Started Operations: June 2004 Progress to Date: (July 31, 2006) –TM-R DCTs complete (3,320 DCTs, 555,000 scenes) –TM-R HDTs complete (5,444 HDTs, 112,000 scenes) –TM-A DCTs complete (108 DCTs, 17,000 scenes) –TM-R New Landsat 5 Data (86,000 scenes) –MSS-A started (21 DCTs, 17,000 scenes) Transcription rate will decrease as we handle more data anomalies and problem tapes Estimated completion: December 2006

9. LACS Configuration

10. LACS Status LTS (LACS Transcription Subsystem) 4 Strings: –LTS1: Current Landsat 5 data (acquired at EDC or GLC, or received on DLT from Australia) –LTS2: DCT Input (2 shifts per day, 5 days a week) –LTS3: DCT Input (2 shifts per day, 5 days a week) –LTS4: DCT Input (2 shifts per day, 7 days a week)

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 3 strings

12. LACS Status Issues / Problems: –Data anomalies, tape degradation, cross-play issues –DCRSi tape drives require frequent cleaning and maintenance Plans: –Complete tape transcription –Port LTS from SGI to Intel (Linux)