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Community Geodetic Model (CGM) Workshop

Conveners: Jessica Murray (USGS), Rowena Lohman (Cornell) and David Sandwell (UCSD/SIO)
Dates: January 28-29, 2016
Location: Kellogg West Conference Center, Pomona, CA
Attendance: If interested in attending, please contact conveners
SCEC Award: 15152

OVERVIEW: The SCEC Community Geodetic Model Workshop will be held in Pomona, California on January 28-29, 2016. The primary focus of the workshop will be integration of the GPS and InSAR groups' results into a combined CGM product. We will identify action items for this last year of SCEC4 research and outline next steps that will carry the CGM into a hoped-for SCEC5 collaboration. A talk presented at the 2015 SCEC Annual meeting that provides an overview of the CGM and recent results (click to download PDF).

An optional post-workshop meeting will be held Friday afternoon (1:00-4:00pm) for those who are interested. The topic will be InSAR processing methods for the new wide-swath data streams from Sentinel-1A and ALOS-2. We will assemble sample data sets  prior to the meeting so participants can compare results and techniques.

PARTICIPANTS: Piyush Agram (NASA JPL), Scott Baker (UNAVCO), Adrian Borsa (SIO), Heresh Fattahi (Caltech), Yuri Fialko (UCSD), Eric Fielding (JPL, Caltech), Mike Floyd (MIT), Gareth Funning (UCR), Bill Hammond (University of Nevada, Reno), Tom Herring (MIT), Mong-Han Huang (NASA JPL), Tran Huynh (SCEC/USC), Chris Johnson (UC Berkeley), Cunren Liang (NASA JPL), Zhen Liu (JPL), Paul Lundgren (JPL),  Rob McCaffrey (PSU), Jessica Murray (USGS), Susan Owen (JPL), Gilles Peltzer (UCLA), David Sandwell (SIO), Zheng-Kang Shen (UCLA), Manoochehr Shirzaei (ASU), Mark Simons (Caltech), Josh Spinler (University of Arkansas at Little Rock), Xiaopeng Tong (University of Washington), Ekaterina Tymofyeyeva (UCSD), Xiaohua Xu (Scripps Inst of Oceanography), and Yuehua Zeng (USGS)

JANUARY 28, 2016

Presentation slides may be downloaded by clicking the title of the presentation.
PLEASE NOTE: Files are the author’s property. They may contain unpublished or preliminary information and should only be used while viewing the talk.

09:00 - 09:10 Welcome remarks, workshop objectives Jessica Murray
09:10 - 09:30 The Community Geodetic Model: Overview (PDF, 1.7MB) Jessica Murray
  InSAR update (multiple presentations)  
09:30 - 09:45 The Community Geodetic Model (CGM) Workshop (PDF, 7.3MB) David Sandwell
09:45 - 10:15 Do we need GPS for InSAR time Series? Zhen Liu and Heresh Fattahi
10:15 - 10:30 Mitigating Atmospheric Errors in SAR Interferometry Data (PDF, 3.7MB) Gilles Peltzer
10:30 - 10:45 Break  
10:45 - 11:00 Mitigating atmospheric errors II Ekaterina Tymofyeyeva
11:00 - 11:15 Discussion Group
  GPS update (GPS position time series)  
11:15 - 11:30 Campaign GPS Data Processing for Integrated SCEC Community Geodetic Model (PDF, 2.1MB) Zheng-Kang Shen
11:30 - 12:00 Comparing and Merging GPS Time Series (PDF, 8.3MB) Tom Herring
12:00 - 13:00 Lunch  
  GPS update (Derived quantities)  
13:00 - 13:30 CGM: Post Seismic Modeling (PDF, 6.7MB) Zheng-Kang Shen, Tom Herring and Rob McCaffrey
13:30 - 14:00 Characterization of seasonal signals and earthquake-related displacements for optimal cleaning of GPS time series, improving vertical rate estimates, and better comparisons with InSAR (PDF, 7.2MB)

GPS Imaging of Vertical Motion (PDF, 5.6MB)

Adrian Borsa and Bill Hammond
14:00 - 14:30 CGM: Secular Rate Comparison (PDF, 1.2MB) Tom Herring and Zheng-Kang Shen
14:30 - 15:15 Discussion Group
15:15 - 15:30 Break  
  Bringing InSAR and GPS together (part I)  
15:30 - 15:50 Merging GPS and InSAR for uniform velocity (PDF, 3.5MB) Xiaopeng Tong
15:50 - 16:10 Published Approaches to InSAR Time Series (PDF, 2.1MB) David Sandwell
16:10 - 17:00 Discussion Group
17:00 Adjourn  
18:00 Dinner  


JANUARY 29, 2016

09:00 - 10:00 Bringing InSAR and GPS together (part II) Manoochehr Shirzaei and Volunteers
10:00 - 10:30 Impact of new SAR data and how to leverage them. Software tools for using new SAR data Scott Baker and Eric Fielding
10:30 - 10:45 Break  
10:45 - 11:30 Discussion: How to move forward on the integrated CGM as a group Group
11:30 - 12:00 Next steps Group
12:00 Adjourn  
12:00 - 13:00 Lunch  
13:00 - 16:00 Optional post-workshop meeting: InSAR processing methods for the new wide-swatch data streams from Sentinel-1A and ALOS-2  
13:00 - 14:00 Scansar Interferometry Along the Southern San Andreas Fault System (PDF, 4.5MB) Cunren Liang, David Sandwell, Eric Fielding, and Group
14:00 - 15:30 Precise coregistration of Sentinel-1A TOPS data (PDF, 2.4MB) Heresh Fattahi, Xiaohua Xu, Piyush Agram, and Group
15:30 - 16:00 Assemble test data sets Scott Baker and Group
16:00 Adjourn