USGS/EDC Archive Preservation Status An Update Stuart Doescher, USGS (Cheryl Greenhagen) W GISS-18 September 2004 Beijing, China. 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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Stuart Doescher, USGS
(Frame sync required to read)
plus current Landsat 5 data
and ~ 700 tapes of "raw" data
on 9940B. (200G/tape)
System – Part I
System – Part II
LACS Tape Tracking and Assessment
System – Part III
Interval Tables, Scene Tables, 9940B Tables
Historic Scene Info
All LDB Info
Working Copy 9940B
Transcription Operators Assessment Operators Production Control
EE Browse Images
(acquired at EDC, or received on DLT from Australia.)
( less than 1 shift a day - because LIS can't keep up)
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.