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Page 1
Landsat Data Continuity Mission Status
Jim IronsLDCM Project Scientist
Earth Sciences Division
NASA Goddard Space Flight Center
Greenbelt, Maryland
LDCM SRR/MDR/PNAR 22-24 April 2008
October 25, 2012
Page 2
Landsat History
Enabling 40 Years of Global Land Surface Observations
Page 3
NASA / USGS Parnership
NASA leads development and launch of satellite observatory Spacecraft Two-instrument payload
– Operational Land Imager – OLI
– Thermal Infrared Sensor – TIRS
USGS leads ground system development and post-launch operations Mission Operations Center – MOC Ground Network Element – GNE Data Processing and Archive System (DPAS)
Page 4
Project StatusProject Status
Courtesy of Orbital
Page 5
Launch
Launch will be from Vandenberg Air Force Base (VAFB), California
Lower stage arrived via Antonov AN-124 aircraft flight on August 27
Upper stage Centaur arrived September 14 via truck
Landsat 8 on schedule for February 11 launch date
Page 6
Observatory Testing at Orbital
• The observatory is in the final phases of testing at the Orbital Science Corp. facility in Gilbert, Arizona
• Successfully completed electromagnetic interference / electromagnetic compatibility (EMI/EMC) in August
• Successfully completed dynamics testing (acoustics and vibration) in September
• The final phase of testing, thermal vacuum (T/Vac) began Saturday, October 20
• Shipment to VAFB scheduled for December
EMI/EMC Test Chamber at Orbital
Page 7
Integrated Satellite ObservatoryIntegrated Satellite Observatory
Page 8
Operational Land Imager (OLI)
• OLI built by Ball Aerospace & Technology Corp. (BATC) of Boulder, CO• Contract awarded in July 2007• Critical design review held October, 2008 • Fully assembled & tested OLI shipped to spacecraft vendor on October 02, 2011
Page 9
Fully Assembled OLI
Instrument description 8 VIS/NIR/SWIR bands w/
30 m spatial resolutions one panchromatic band w/
15 m resolution Pushbroom sensor Four-mirror telescope with
front aperture stop Focal Plane Assembly
(FPA) consisting of 14 sensor chip assemblies, passively cooled
Absolute radiometric accuracy < 5%
Mass: 450Kg Operational Power: 160 W Size: 1.8 m x 2 m x 1 8 m
Page 10
Thermal Infrared Sensor (TIRS)TIRS built in-house at NASA/Goddard Space Flight Center
TIRS was officially added to the scope of the mission in December 2009Critical Design Review held April 2010Fully assembled & tested TIRS shipped to Orbital on February 08, 2012
TIRS was not added to the payload until western states water managers,with organization by the Western States Water Council, advocated for
restoration of Landsat thermal imaging requirements
Page 11
Fully Assembled TIRS
• Instrument description• Two spectral bands at 10.8 and 12
micrometers
• 100 m spatial resolution
• Pushbroom LWIR sensor
• Four-lens telescope
• FPA consisting of three 2-dimensional Quantum Well Infrared Photodector (QWIP) sensor chip assemblies
• Mechanically cooled focal plane; BATC provided cryo cooler
• NEdT @ 300K < 0.4
• Mass: 240 Kg
• Operational Power: 380 W
• Size: 80 cm x 76 cm x 43 cm (with earth shield deployed)
Page 12
OLI Spectral Bands
Page 13
L7 ETM+ Thermal Band LDCM TIRS Band Requirements
Band 6 60 m LWIR 10.00 - 12.50 100 m LWIR 10.30 – 11.30 Band 10
100 m LWIR 11.50 – 12.50 Band 11
TIRS and ETM+ Spectral Bands
Page 14
Top Level Mission Ops Concept - Continuity
Fly Landsat 8 in legacy orbit (705 km, near-polar, sun-synchronous)
Ground tracks maintained along heritage WRS-2 paths with 10:00 a.m. equatorial crossing time & 16 day repeat period
Collect image data for multiple spectral bands (Vis/NIR/SWIR/TIR) across 185 km swath along each path
Provide coverage of global land mass each season by scheduling the collection of 400 WRS-2 scenes per day
Maintain rigorous calibration
Archive data and distribute data products Provide nondiscriminatory access to general public, generate Level 1
data products, distribute data products at no cost upon request
Direct broadcast of data to network of international ground stations having memoranda-of-understanding with USGS
Page 15
Web Sites
http://landsat.gsfc.nasa.gov
http://landsat.usgs.gov
http://www.nasa.gov/landsat
FaceBook Page
http://www.facebook.com/NASA.Landsat
Twitter Site http://twitter.com/#!/NASA_Landsat
Page 16
Back Up
Page 17
February 11, 2013
Page 18
Polar Orbits for Global Views
Page 19
Urgency
Page 20
ETM+ SLC Failure Impact
Note that the images show partial scenes, from the western edge through the scene center.
Page 21
LDCM Spacecraft
• Spacecraft contract awarded to General Dynamics Advanced Information Systems (GDAIS) in April, 2008• GDAIS sold to Orbital Sciences Corporation in April 2010
• Space craft will accommodate OLI and TIRS• Provides pointing, power, data capacity, etc. to support LDCM
operations
• Orbital Sciences Corporation is integrating OLI and TIRS onto the spacecraft at their Gilbert, AZ facility and will ship the observatory to the launch site in Autumn 2012
Page 22
Ground System Operational ArchitectureGround System Operational Architecture
22