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Mid Decadal Global Land Survey Project

Mid Decadal Global Land Survey Project. briefing to the ScanEx RDC 3 rd International Conference, Earth from Space: The Most Effective Solutions presented by Steven Covington The Aerospace Corporation Landsat 7 Flight Systems Manager / Project International Coordinator /

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Mid Decadal Global Land Survey Project

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  1. Mid Decadal Global Land Survey Project briefing to the ScanEx RDC 3rd International Conference, Earth from Space: The Most Effective Solutions presented by Steven Covington The Aerospace Corporation Landsat 7 Flight Systems Manager / Project International Coordinator / MDGLS Phase I Lead December 4-6, 2007

  2. The Landsat Satellite Family • Landsat 1-3 • First Civil Land Remote Sensing Missions • Flown from 1972 – 1982 • Primary Sensors: • Multi-Spectral Scanner (MSS) • Return Beam Vidicon (RBV) • Landsat 4 and 5 • Landsat 4 flown 1982 – 2002 • Landsat 5 from 1984 – Present • Primary Sensors • Multi-Spectral Scanner (MSS) • Thematic Mapper (TM) • Landsat 7 • Flown from 1999 – Present • Primary Sensor: • Enhanced Thematic Mapper Plus (ETM+)

  3. Mid-Decadal Global Land Survey • The USGS and NASA have worked together in the past to create three global surveys of the Earth’s landmass from orthographically-corrected satellite imagery centered on specific timeframes • Global Land Survey (GLS)1975, GLS1990 and GLS2000 • The objective of MDGLS is to extend this series with a new global land survey centered on a 2005-2006 epoch • The Project has 2 Dataset Production Phases: • Phase 1: satellite tasking, ground station coordination, scene selection, data transfer, and ingest into the USGS archive • Landsat 5 & 7 TM and ETM+ data will be the primary sources of data • Compatible ETM+ scenes will be used to makeup a composite pair • Other sensors: EO-1, ASTER, … • Phase 2: Process the collected data into an ortho-rectified dataset of virtually cloud-free scenes compatible with previous surveys

  4. Mid-Decadal Global Land Survey • Past Survey Coverage Statistics • 1970’s: 6,976 path/rows • 1990: 7,037 path/rows • 2000: 8,209 path/rows • MDGLS will increase total coverage to approximately 9,500 scenes • Inclusion of the Antarctic continent • Better accounting of islands and reefs • Full coverage of Arctic area in ‘ascending’ orbit • The MDGLS Scene Baseline includes 13,106 unique path/rows • This number includes Antarctica, but doesn’t exclude the geographic coverage overlap at high latitudes • Antarctica accounts for 3589 Path/Rows (~1200 unique coverage) • The final MDGLS unique scene count should be in the range of 9300 path/rows

  5. Scene Selection Criteria • Mid-decadal acquisition period of 2004-2007 • (2005-2006: Prime) • Cloud Cover ≤ 10% • ETM+ SLC-Off Composite Pair filler targeted at ≤ 5% • Landsat 7 Gap Closure of > 95% • Assumes the allowance of a 2-pixel interpolation • Coverage Seasonality • Green Season: a date criteria was developed that matched the period when the NDVI was within 40% of its maximum value and dynamic range • Efforts are made to match acquisition dates with previous surveys to aid in land cover change analysis

  6. MDGLS Baseline Coverage Green = GeoCover 2000 Coverage Red = New MDGLS Coverage

  7. Landsat 5 International Cooperator Ground Station Coverage

  8. MDGLS Campaign Station Locations Magadan The Malindi and Yucatan stations came into service too late for inclusion in the GLS2005 dataset

  9. Landsat 5 Global Archive Accessibility Tested Capability Untested, but Compatible

  10. Landsat 5 Coverage in US Archive Each of these areas meet initial coverage requirements based on metadata

  11. Archived L7 ETM+ Coverage Meeting Specification* Green = 2005/2006 Coverage Yellow = 2004/2007 Coverage * Meets metadata standards, but may not be suitable for inclusion in the survey dataset

  12. Before Production Begins… • The USGS and NASA have funded the reprocessing of the Tri-Decadal datasets (GeoCover) to improve the geometric accuracy • Terrain correction is being updated with Shuttle Radar Topography Mission (SRTM) data • Production process is being improved • Reducing the number of error-producing tie-points between individual blocks • The products are now resampled to 15/30/60(120) meters • This reprocessing is now underway • The 2000, 1990 and 1975 surveys will each be reprocessed • The reprocessed data will be made available at no charge as it becomes available • This new and improved dataset will be used as control for all future Landsat product ground control - including the GLS2005

  13. Production Sequence LGGS Delivery/MDGLS Processing: Landsat archive Order IC Stations Campaign Stations North America Canada Chetumal 1 Caribbean Chetumal 2 Africa, Madagascar South Africa Maspalomas 3 Eurasia China Japan* Thailand Kiruna, Moscow, Irkutsk, Magadan 4 Australia Australia 5 New Zealand Australia 6 South America Argentina Brazil Chetumal 7 Indonesia Indonesia Thailand 8 Greenland Kiruna 9 Japan Japan* China 10 Iceland Kiruna 11 Islands 12 No issues ETM+ product will begin production in early 2008 TM products will begin production in mid-2008 All production completed by end of 2008 Likely to proceed; issues in work Unlikely at present; issues in work * Ingest capability unknown

  14. Global Land Survey Distribution Policy • Individual products will all be made available online at no charge • Products will become available soon after production • Contributors to the Mid Decadal GLS2005 dataset will receive a complete copy once production is complete • All GLS data is available through the USGS for download at no charge • Go to http://glovis.usgs.gov/ • For the Scene Collection, Choose ‘Landsat Decadal’

  15. Landsat Data Distribution Policy Update • Select ETM+ data are being distributed at no charge as part of a Landsat Data Continuity Mission pilot project • What’s Included: • New ETM+ acquisitions with less than 20% cloud cover and quality scores of ’99’ from the US and Territories • More geographic area will be added over the next 6 months, eventually leading to global coverage • Expanding Options • It is planned that by the end of Calendar 2008, all newly acquired SLC-off scenes will be made available for no charge using the standard product specification • Additional datasets will eventually be added, including • Landsat 7 ETM+ SLC-on • Landsat 4/5 TM • Landsat 1-5 MSS

  16. Standard Product Specification • Pixel size: 15m/30m/60m(14.25/28.5/57m) • Media type: Download (no cost), CD/DVD ($50) • Product type: L1T (terrain-corrected) • Output format: GeoTIFF • Map projection: UTM • Orientation: North up • Resampling: Cubic convolution • Publically available terrain data used to produce Global Land Survey products will be made available at no charge

  17. Other Developments • The Landsat Data Continuity Mission (LDCM) is scheduled for launch in mid-2011 • It is currently planned that data products following the ‘standard specifications’ are made available at no charge • The U.S. Government is standing up a new organization; the National Land Imaging Program (NLIP) • This Program will be responsible for collection of civil land remote sensing data for the US archive • The Department of the Interior will manage the program • A main goal of NLIP will be to ‘operationalize’ collection of Landsat-class observations

  18. Thank You

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