u.s. geological survey eros data center landsat program archive advisory committee meeting 19-20...
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U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Landsat Status Briefing:ETM+ SLC-off Impact and Solutions/Landsat 5
Tracy Zeiler
Landsat Project Chief
October 19, 2004
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Landsat 7 ETM+ SLC Failure: Return to Operations Timeline
May 31, 2003 - ETM+ scan line corrector failed July 14, 2003 - ETM+ acquisitions resumed September 3, 2003 – USGS approval for recovery attempt; SLC did not
restart September 16, 2003 – Final reconfiguration of instrument completed September 18, 2003 – Resumed normal LTAP acquisitions, downlinks
to ICs October 22, 2003 – Released standard L1G SLC-off product October 28, 2003 – New product brainstorming workshop May 10, 2004 – Released phase 1 SLC-off to SLC-on gap-filled product November 2004 – Release phase 2 SLC-off to SLC-off gap-filled
product
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Initial New Product Development Plan
Requirement for multiple product types to satisfy different user communities
– Result will be suite of products based on ETM+ SLC-off data Use integrated team to provide technical input
– Include USGS, NASA and operational agency scientists and engineers
– Identify all options for ETM+ product improvement
– Identify benefits/risks/complexity/cost-to-benefit for all options
– Prioritize options from those easily achievable in the near-term to those that require research prior to possible future implementation
Implement near-term product options that will satisfy some user requirements
Continue with phased development of new product types
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Phase 1 SLC-off Products and Associated Improvements
Enhance existing browse to show impacts to L1G data (i.e. data gaps) Let users choose the number of interpolation pixels used during processing
when ordering products (0-15 pixels) Implement new interpolation method Include gap pixel mask with Level 1 products including interpolated products Implement a Landsat 7 ETM+ SLC-off to SLC-on gap-filled product
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Phase 1 SLC-off to SLC-on Product Summary
Level-1G product is radiometrically and geometrically corrected
Requires scene-to-scene registration Localized linear histogram matching implemented
with static window size The linear method chosen used a function of the
standard deviation for gain and a function of the mean for offset in estimating gap-fill pixels
Highly saturated pixels are excluded from histogram calculation
Optimum input is SLC-on image acquired 1-year prior
– Similar phenology improves histogram matching
– Minimum cloud cover is recommended to allow scene registration and reduce artifacts; other transient phenomenon also affect final image quality
Search and order system selects default and prioritizes SLC-on scenes based on above criteria
Cost $275/scene
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Phase 2 SLC-off Products and Associated Improvements
Generate enhanced browse data that illustrates the data gaps in each ETM+ SLC-Off image
Implement a Landsat 7 ETM+ SLC-off to SLC-off gap-filled product Provide user an indication of SLC-off to SLC-off scene compatibility Implement modified histogram matching algorithm Include gap pixel mask with Level 1 products that indicates data source
of all fill values
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment DPhase 2 SLC-off to SLC-off Product Summary
(slide 1 of 2)
Level-1G product is radiometrically and geometrically corrected
Requires scene-to-scene registration
Localized linear histogram matching implemented with adaptive window
The method was modified to use linear regression in computing pixel transformations
Highly saturated pixels are excluded from histogram calculation
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Phase 2 SLC-off to SLC-off Product Summary (slide 2 of 2)
Requires SLC-off image(s) acquired as close as possible to primary SLC-off image– Minimum cloud cover in both primary and secondary image(s) to
reduce image artifacts; other transient phenomenon also affect final image quality
– Minimum cloud cover SLC-on image required to allow scene registration
– Random gap placement increases complexity of scene selection that will ensure complete ground coverage
Metadata called the gap phase statistic calculated during input scene production to provide an indication of SLC-off scene compatibility
Search and order system provides list of available SLC-off scenes for gap filling and default SLC-on image for registration– Provides predicted ground coverage for SLC-off images selected
based on gap phase statistics Cost $300/scene
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Composite Gap Area Probability
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Landsat Business Model
Landsat operating funds were derived from three sources*
– Appropriated funds 48%
– Data sales income 38%
– International cooperator fees 14% SLC failure has impacted the viability of the previous model
– FY04 operating funds required 73% appropriated funding
Additional appropriated funds are required to continue mission – Permanent appropriations not yet identified
– Data sales still falling
– IC income dropping
*based on 2003 pre-anomaly budget
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Trends in Landsat ETM+ Data Sales(FY 2000 – 2004)
$0
$2,000,000
$4,000,000
$6,000,000
$8,000,000
$10,000,000
$12,000,000
1 4 7 10 13 16 19 22 25 28 31 34 37 40 43 46 49 52
FY-00 FY-01 FY-02 FY-03 FY-04
Reference: Dollar Trending Stats - FY04 V5_final.xls
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Landsat 7 ETM+ SLC-on versus SLC-off FY04 Product Sales
Scenes Shipped by Percent
0%10%20%30%40%50%60%70%80%90%
100%
09
/19
/03
10
/17
/03
11/1
4/0
3
12
/12
/03
01
/09
/04
02
/06
/04
03
/05
/04
04
/02
/04
04
/30
/04
05
/28
/04
06
/25
/04
07
/23
/04
08
/20
/04
09
/24
/04
SLC OFF SLC OFF to ON Gapfill SLC ONReference: Dollar Trending Stat - FY04 V5_final.xls
• Demonstrates the normal sales growth for new products
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Landsat ETM+ SLC-on versus SLC-off Product Demand
FY2004 Product Sales Breakout 19 Mar 2004 - 30 Sep 2004
77%
23%
SLC-on
SLC-off
Reference: Dollar Trending Stat - FY04 V5_final.xls
FY2004 Product Sales Breakout (24 Oct 2003 - 30 Sep 2004)
85%
15%
Reference: Dollar Trending Stat - FY04 V5_final.xls
• Demonstrates the increase in SLC-off sales with new product releases
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Other Landsat 7 Status Information
Long term acquisition plan has been modified to aid in the collection of potential SLC-off to SLC-off image pairs; nominal rate increased from 250 to 300 scenes per day
Number of participating International Cooperators is down due to SLC failure; current participating ICs include:
Gyroscope 3 was exhibiting anomalous behavior and was turned off (May 5, 2004); mission continues with no loss of function; accuracy and precision of imagery unaffected
End-of-life based on fuel estimated to be Spring, 2011
Australia, Argentina, Canada, Indonesia, Japan
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Landsat 5 Status
Number of ICs downlinking Landsat 5 has increased.– Australia, Argentina, Brazil, Canada, China, ESA, South Africa,
Thailand Investigation of amplifier behavior resulted in standby operations mode
that does not preclude additional IC downlinks Battery 3 behavior required that it be turned off (May 21, 2004); nominal
operations continues with 2 batteries Addition of telemetry (S-band) downlinks to ASA New sensor alignment parameters and addition of definitive ephemeris
will make geometric accuracy more consistent; data will be available from 1993 forward
Improved radiometric calibration through inclusion of general detector change and changes due to ice buildup in lookup table; up to 20% improvement
End-of-life based on fuel is estimated to be Spring, 2009
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
U.S. Landsat Archive(Marketable Scenes through September 29, 2004)
ETM+: Landsat 7– 446,774 scenes– 323TB data in archive (RCC and L0Ra)– Archive grows by 300GB Daily
TM: Landsat 4 & Landsat 5– 550,626 scenes– Approximately 135TB of Data in Archive– Archive Grows by 30GB Daily
MSS: Landsat 1 through 5– 641,555 scenes– Approximately 20TB of Data in Archive
U.S. Geological SurveyEROS Data CenterLandsat Program
Archive Advisory Committee Meeting19-20 October 2004
Attachment D
Summary
Landsat Project reacted quickly to SLC failure by quick return to acquisitions, recovery attempt, move to SLC-off operations and new product development.
Three SLC-off product types are available for current and future acquisitions:– Level-1G SLC-off
– Level-1G Interpolated SLC-off
– Level-1G SLC-off to SLC-on Gap-filled
Users are ordering SLC-off and new products Landsat 7 and Landsat 5 are expected to continue operations
until 2011 and 2009 respectively