GPS Position Time Series @ JPL · GPS Network Precise Point Positioning (PPP) • Operational...
Transcript of GPS Position Time Series @ JPL · GPS Network Precise Point Positioning (PPP) • Operational...
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Mars Science Laboratory!GPS Position Time Series @ JPL
Susan Owen Jet Propulsion Laboratory,
California Institute of Technology Angelyn Moore, Sharon Kedar, Zhen Liu, Frank Webb,
Mike Heflin, Shailen Desai
© 2013 California Institute of Technology. Government sponsorship acknowledged.
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GPS Network Point Posi/oning Lead: Angie Moore
Geodynamics & Space Geodesy Group (GSGG)
JPL Opera/onal GPS Orbit Analysis
Lead: Shailen Desai Near Earth Tracking ApplicaAons
Group & Systems Group
GIPSY-‐OASIS Processing So>ware Lead: Shailen Desai
Near Earth Tracking ApplicaAons Group & Systems Group
Real-‐Time GIPSY/ GDGPS
Lead: Yoaz Bar-‐Sever Near Earth Tracking Systems
Group
JPL Global Time Series Analysis
Lead: M. Heflin GSGG
JPL/SOPAC MEaSUREs Combined Time Series & Veloci/es Leads: Y. Bock & S. Kedar
Scripps & GSGG
ARIA Time Series and Earthquake Response
Products Lead: S. Owen
GSGG, others @ JPL & Caltech
Overview of GPS Analysis Groups - Solid Earth
Global Plate Motion
Geocenter & Reference
Frame
Crustal Deformation
Earthquake & Eruption
Models
Earthquake& Volcano Response
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GPS Network Precise Point Positioning (PPP)
• Operational Analysis of Global GPS Stations – 2986 time series – From Aug 15, 1992 to present – Includes all of PBO Network – Positions & Tropospheric products
added on weekly basis – Products generated using JPL Final
orbits & clocks – IGS08 reference frame – Download raw time series from:
ftp://sideshow.jpl.nasa.gov/pub/JPL_GPS_Timeseries/repro2011b/raw/
– Go to website for more information: https://gipsy-oasis.jpl.nasa.gov , click on PPP data products
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JPL Global Time Series
• Post-processing of PPP solutions includes:
– Outlier removal – Offset detection – Time Series Fit for velocities, offsets,
amplitude of annual and semi-annual periodic function
– Parameter values available on website: http://sideshow.jpl.nasa.gov/post/series.html – Plots available as well
• 2389 sites • 1995 to present • Time series, residuals available at
ftp://sideshow.jpl.nasa.gov/pub/JPL_GPS_Timeseries/repro2011b/post/
SOPAC -‐
GAMIT
Combina2on -‐st_filter
GPS observables + metadata
L0: GPS Observables + Metadata
L1A: Global Long term raw Geodetic Time Series L1B: Troposphere delay time series
L1C: Calibrated and Validated Global Geodetic Time Series L2A: Precipitable Water Vapor time series
JPL -‐ GIPSY
Global sta2on posi2ons
Global sta2on posi2ons
Global cal. & val. sta2on posi2ons
Principal Component Analysis
Time Series Analysis
Global filtered 2me series
L2B: Filtered Calibrated & Validated Global Geodetic Time Series L3A: Global Tectonic Velocities
Global Tectonic Veloci2es
JPL & SOPAC Combined Time Series
Tropospheric delays
Tropospheric delays
Independent atmospheric
data or Weather models
Precipitable Water Vapor generator
PWV
SOPAC Archive / CDDIS
GPS Explorer
Process
Product
Produced outside SESES
L1 Processes and products
L2 Processes and products
L3 Processes and products
New products
Legend
Solid Earth Science ESDR System
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JPL/SOPAC Coverage, Time Series
MEaSUREs 2006 MEaSUREs 2012
Time Series Analysis: • 1992 - present
• 1-2 week latency in updates to time series • 1845 sites - will expand under MEaSUREs 2012 • Outlier removal • Velocities, offsets, seasonal amplitudes and phase, postseismic transients
Common Mode Error removed from filtered time series • PCA analysis • Only time series residuals from well-behaved sites used in PCA
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JPL/SOPAC Combined Time Series
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Advanced Rapid Imaging and Analysis
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ARIA Data Systems Overview
• ARIA-‐EQ prototype data system – Current automated capabili2es
• InSAR – Raw frames (ALOS, ENVI, CSK) – Geocoded interferograms – On-‐demand Damage Proxy Map
• GPS – Kinema2c Posi2on Time Series (sub-‐daily posi2ons) – Daily Posi2on Time Series – Quality control
– Runs on Beowulf compute cluster – Year 3 developing automated EQ Product and fault modeling capability
• ARIA-‐MH data system – Migrate capabili2es onto hybrid cloud compu2ng infrastructure. – Integrate Monitoring Data Products (e.g., InSAR Time Series Analysis)
• REPAIR -‐ Integrate ARIA Products with USGS NEIC • ARIA Co-‐Laboratory -‐ Build Analysis & Modeling Workbench
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ARIA EQ: Events with Demo Response Data Products
2010 M7.0 Haiti • Coseismic Interferogram 2010 M7.2 M El Mayor-Cucapah • GPS offsets • Coseismic Interferograms • SAR Pixel offset image
2011 M9.0 Tohoku • GPS displacement waveforms • GPS coseismic offsets (mainshock,
major aftershock) • Coseismic interferograms (mainshock,
aftershock) • Damage Proxy Map (for tsunami
damage in select regions)
2011 M6.3 Christchurch • Coseismic interferogram • Damage Proxy Map
2011 M7.1 Van • Coseismic Interferogram • SAR Pixel offset image • GPS coseismic offsets
2012 Brawley Seismic Swarm (M5’s) • GPS displacement waveform • GPS coseismic offsets (for cumulative
events) 2012 M7.6 Costa Rica • GPS displacement waveform • GPS coseismic offsets
2013 M5.8 Sumoto, Japan • GPS coseismic offsets
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ARIA Monitoring Data Products
Product Needs/Applications
GPS time series and displacements
Forms the basis for higher level products. Provides high temporal resolution for monitoring surface deformation, transient detection.
InSAR displacements Forms the basis for higher level products. Provides high spatial resolution maps of surface deformation for assessing hazards.
Coherence Change maps and time series
Detects damage from lava flow, ash fall, earthquakes, landslides, levee failure, floods, etc. Very useful with all-weather day/night capability and comprehensive coverage. U.S. patent for algorithm (Yun et al., 2011b).
InSAR Time Series Provides history of surface deformation with high spatial resolution, input for data fusion and transient detection.
Reflectivity Change maps Detects damage from flood and tsunami. Can provide volcano monitoring capability. Very useful with all-weather day/night capability and comprehensive coverage.
Troposphere-corrected interferograms
Higher fidelity surface deformation measurements.
Combined GPS and InSAR 3D surface motion maps
High spatial and temporal resolution products for monitoring. Provides basis for transient detection.
Advisory Alerts of anomalous ground motion
Identifies regions that need further investigation. Useful for regions where data set is too large to evaluate manually
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Summary/Comments
• Different flavors of GPS time series analysis at JPL – Use same GPS Precise Point Positioning Analysis raw time series – Variations in time series analysis/post-processing driven by different
users. • JPL Global Time Series/Velocities - researchers studying reference frame,
combining with VLBI/SLR/DORIS • JPL/SOPAC Combined Time Series/Velocities - crustal deformation for
tectonic, volcanic, ground water studies • ARIA Time Series/Coseismic Data Products - Hazard monitoring and
response focused
• ARIA data system designed to integrate GPS and InSAR – GPS tropospheric delay used for correcting InSAR – Caltech’s GIANT time series analysis uses GPS to correct orbital errors
in InSAR – Zhen Liu’s talking tomorrow on InSAR Time Series analysis…