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2018 Community Geodetic Model Workshop

Conveners: Jessica MurrayDavid SandwellGareth Funning, and Rowena Lohman
Dates: March 12-13, 2018
Location: Martin Johnson House (Scripps Institution of Oceanography)
SCEC Award and Report: 17103

SUMMARY: Throughout the life of the CGM project, we have used a mixture of in-person and virtual workshops (i.e., videoconferences) to plan work, check progress, and share results. While the videoconferences help maintain momentum between in-person meetings, workshops promote efficient dialogue and exchange of ideas, serving to keep participants engaged and focused on the project goals. Our most recent workshop, held in Pomona in January 2016 (https://www.scec.org/workshops/2016/cgm), was highly productive in bringing together the GPS- and InSAR-focused participants to review new developments and evaluate how the pieces of this multi-faceted project fit together.

We will hold a two-day CGM workshop to review the results of the GPS time series compilation, GPS site-velocity comparison, construction of consensus interferograms, and InSAR LOS velocity calculation. We will identify the target work for 2018, which is envisioned to include generation of a consensus GPS velocity field interpolated onto a grid and InSAR time series analyses to characterize time-varying motion. We will also assess any observational or methodological gaps that must be addressed in order to carry out the 2018 work plan.

MONDAY, MARCH 12, 2018

09:00 Morning Refreshments  
09:00 - 12:30 Session 1a: GPS Group Review Exercises in Martin Johnson House
- Review exercise results
- Develop consensus approach for CGM v.2 velocity field estimation
- Discuss broader topics raised during the March 5th telecon
- Identify follow-on exercises that may be needed (e.g. for interpolating velocity field on a grid; coordinate with needs of InSAR group)
- Map out action items (current and future)
  Session 1b: InSAR Group Review Exercises in Spiess Hall 303
- Review differences in interferograms and coherence maps
- Review InSAR time series
- Discuss atmospheric mitigation approaches
- Identify best practices for InSAR time series
- Map out action items (current and future)
12:30 - 13:30 Lunch  
13:30 - 15:30 Session 2: Joint GPS and InSAR in Martin Johnson House
- GPS group reports on exercises and plans
- InSAR group reports on exercises and plans
- Discussion of GPS/InSAR Integration
15:30 - 18:00 Session 3: Subgroups work on matters arising from Session 1& 2 discussions  
18:30 - 19:30 Dinner  


08:30 Morning Refreshments  
08:30 - 11:30 Session 4: Joint GPS and InSAR in Martin Johnson House
- Report back on any additional outcomes of subgroup activities from Session 3
- Proposals for GPS InSAR integration
- Discuss website and data products
- Planning on follow-up work
11:30 - 12:30 Lunch  


Adrian Borsa (Scripps)
Eileen Evans (USGS/CSUN)
Yuri Fialko (UCSD/Scripps)
Mike Floyd (MIT)
Gareth Funning (UC Riverside )
Alejandro Gonzales-Ortega (CICESE)
Bill Hammond (UNR)
Tom Herring (MIT)
Emilie Klein (IGPP)
Zhen Liu (JPL/Caltech)
Phil Maechling (USC)
Jessica Murray (USGS)
Mark Murray (USGS/New Mexico Tech)
Wesley Neely (UCSD/Scripps)
David Sandwell (UCSD/Scripps)
Zheng-Kang Shen (UCLA)
Manoochehr Shirzaei (ASU)
Ekaterina Tymofyeyeva (UCSD)
Kang Wang (UC Berkeley)
Xiaohua Xu (UCSD)
Yuehua Zeng (USGS)