1. USGS/EDC Archive Preservation Status An Update Stuart Doescher, USGS
(Cheryl Greenhagen)
WGISS-18
September 2004
Beijing, China

2. TM and MSS Archive Conversion System (TMACS)
Operations: 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: and an additional 143 as backup
Format: BSQ ( MSS-X)
"orphan" data (no DIAT / SLAT) : 172 HDTs
Bad input tapes: (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, 3500 DCTs,
plus current Landsat 5 data
Output: ~ 600 tapes of "formatted" data
and ~ 700 tapes of "raw" data
on 9940B. (200G/tape)
Format: BSQ

6. 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.

7. Data to be converted Data Set Number of Scenes Number of Tapes
Data Volume
MSS-P
65,128
118 DCTs
3.2 terabytes
MSS-A
262,088
277 DCTs
9.5 terabytes
TM-A
13,733
108 DCTs
3.6 terabytes
TM-R (1982 – 1994)
513,514
2,967 DCTs
127.5 terabytes
TM-R (1995 +)
106,300
5,500 HDTs
27.5 terabytes
TM-R (new)
~ 8 terabytes
 960,763
 Total
179.3 terabytes

8. LACS Context Diagram Landsat Production Digital Database Archive Earth
HDTs, DCTs
LTS
LACS Transcription
System
LACS Database
System – Part I
LDBS-I
Scene Tables
Job Histories,
Metadata
LACS
Duplicator System
LDS
Interval Tables, Scene Tables, 9940B Tables
Updated Tables
LDBS-II
LACS Database
System – Part II
Metadata Handler
Label
Information
Historic Scene Info
Master 9940B
Tape Labeling
Software
TLS
Updated
Metadata
Metadata
LACS
Database
LDB
Label
Information
LACS Tape Tracking and Assessment
System
LTTAS
Working
Copy
9940B
All LDB Info
Browse Metadata
Working Copy 9940B
LACS Browse
Generation System
LBGS
LDBS-III
LACS Database
System – Part III
Transcription Operators Assessment Operators Production Control
Updated Tables
Browse Tape
EE Browse Images
EE Browse
Images
Earth
Explorer
DORRAN
NLAPS
Order Information
9940B Tapes

10. Landsat Archive Conversion System (LACS)
Started Operations: June 2004
Progress to Date:
Current Landsat 5 Data: 252 Intervals (5807 scenes)
DCTs: 60 Tapes (508 Intervals, 9669 scenes)
HDTs: 5499 Tapes (534 Intervals, scenes)
This is 25,549 of 960,763 scenes in 2 ½ months
Extrapolates to 94 months or 7.8 years

11. LACS Status Running 3 LTS strings: (LACS Transcription Subsystem)
LTS1: Current Landsat 5 data only
(acquired at EDC, or received on DLT from Australia.)
LTS2: DCT Input.
( less than 1 shift a day - because LIS can't keep up)
LTS3: HDT Input. (1 to 2 shifts per day.)
The HDTs are always cleaned before they are used.
Many of the HDTs are baked.
Some of the HDTs are tried many times before success.
We try both drives;
sometimes we have the tape cleaned again;
sometimes we have the engineer adjust the HDTR.

12. LACS Status
Running 1 LIS string: (LACS Integration Subsystem) on the same box as LTS1.
Performs the Automated Cloud Cover Assessment (ACCA) and Browse Generation for all 3 LTS strings.
The LIS is the bottleneck. (as expected)
LIS gives priority to current Landsat 5 data.
Plan to port the LIS to Linux and run on 3 Linux systems to relieve the bottleneck.
Hope to get the LIS port done late this calendar year
Hope approximately triple our throughput

13. Landsat Archive Conversion System (LACS)
Issues / Problems:
Some tapes in very poor condition
Performance of ACCA and Browse Generation needs improvement
Plans:
Boost performance of ACCA, Browse Generation:
Port to Linux
Run on Multiple Linux Systems