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SDCG-6Oslo, Norway
October 22-24, 2014
SDCG/USGS: Landsat 7 & 8SDCG-6 Session 5: Roles and Responsibilities
Data flows from CEOS agencies
E. Fosnight (USGS)
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SDCG-6Oslo, Norway
October 22-24, 2014
Landsat acquisition and delivery• Acquisition through with a global long term
acquisition plan• Special requests are expected if priority
increase is needed• Data access
– EarthExplorer/GloVIS – standing requests– Bulk Data Download– Machine-to-machine interfaces
• Derived data products
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SDCG-6Oslo, Norway
October 22-24, 2014
Landsat 8 Daily Limit Investigation• During the 2014 Northern Hemisphere Growing Season the
daily imaging rate was gradually increased to establish upper bounds and an optimal daily imaging rate– Increased from 550 to 725 and held at 725 for 4+ cycles– Cloud cover prediction threshold was removed– Most day-lit descending land scenes with less than 50% side lap
imaged (low latitudes)– Cloud avoidance to select best images for scenes with more than 50%
side lap (high latitudes)Images scheduled for descending day-lit land images
550 650 725
High latitude 11,616 (21.4%) 15,426 (28.4%) 19,471 (35.8%)
Low latitude 25,914 (82.8%) 29,584 (94.2%) 30,913 (98.4%)
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SDCG-6Oslo, Norway
October 22-24, 2014
550, 650 and 725 models
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SDCG-6Oslo, Norway
October 22-24, 2014
Data Access through EarthExplorer
• All data (1972-present) in the Landsat Archive are available for no cost– Newer data are held in a on-line cache– All other data is processed on demand– Landsat is moving to a combination of disk and
tape to hold all data on either a fast or slow media• Reprocessing to maintain data quality as background
activitiy
www.gfoi.org
SDCG-6Oslo, Norway
October 22-24, 2014
Data Access through EarthExplorer
• Access to data by – Demand– Bulk data download– Machine-to Machine Interface
• Once baseline data are acquire, database can be kept current with a subscription service to new data as they are acquired.
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SDCG-6Oslo, Norway
October 22-24, 2014
CDR & ECV: Definitions• Climate data record (CDR) – A time series of measurements of
sufficient length, consistency, and continuity to determine climate variability and change. Consistency in processing and reprocessing over years and decades is an essential requirement.
• Essential climate variable (ECV) – Measurements that are technically and economically feasible for systematic observation. Variables that are currently feasible for global implementation for the Global Climate Observing System (GCOS), and have high impact on the UNFCCC and IPCC requirements.
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SDCG-6Oslo, Norway
October 22-24, 2014
CDR and ECV: Goals• Provide continuity of observations and measurements
to support modeling and decision-making• Construct long term data records to establish
historical trends and enable future projections• Remove the burden of processing from the end user• Enable scientific assessments of land surface change
– terrestrial monitoring
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SDCG-6Oslo, Norway
October 22-24, 2014
Landsat CDR & ECV: Access
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SDCG-6Oslo, Norway
October 22-24, 2014
Acquiring CDR & ECV Products
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SDCG-6Oslo, Norway
October 22-24, 2014
Prescriptive Levels of Processing
Scaled DNs TOA Reflectance Surface Reflectance
Provide users with the product most suitable to their needs
On-demand surface reflectance products are available through Earth Explorerhttp://earthexplorer.usgs.gov
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SDCG-6Oslo, Norway
October 22-24, 2014
Aerosol Optical Thickness
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SDCG-6Oslo, Norway
October 22-24, 2014
ETM+ and OLI Surface Reflectance
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SDCG-6Oslo, Norway
October 22-24, 2014
TM Surface Temperature July 2, 2011
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SDCG-6Oslo, Norway
October 22-24, 2014
CDR & ECV Development Schedule
CDR/ECV Target Provisional Target Public Release
Surface Reflectance 2011 March 2012 October
Land Surface Temperature 2015 June 2015 December
Burned Area 2014 December 2015 June
Surface Water Extent 2014 December 2015 June
Snow Covered Area 2015 August 2015 December
Biomass 2015 September 2016 June
Criteria for Public Release Algorithms published in peer reviewed journal Methods for validation published in peer reviewed journal Stakeholder engagement in product evaluation and feedback Uncertainties are acceptable but need to be characterized,
quantified, and documented
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SDCG-6Oslo, Norway
October 22-24, 2014
NASA MEaSUREs• Web-Enabled Landsat Data (WELD)• Global Forest Cover Change (GFCC)• Global Cropland Area Database (GCAD)• NASADEM
– SRTM PLUS (30 meter) release will follow– NASADEM (30 meter) release in early 2017 with
preliminary release in 2015-2016 30 with GDEM V3 fill
• Future Landsat/Sentinel-2 proposals
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SDCG-6Oslo, Norway
October 22-24, 2014
Landsat Future…data model => information model
• Land Change Monitoring, Assessment and Projection (LCMAP)– Per pixel, tiled, data cube
• Partnership with Australia• Partnership with ESA/NASA
– host copy of Sentinel-2 – Derived products– LCMAP
