Jay Parker
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View article: Updating Terrestrial Reference Frame using Sequential Computation Method
Updating Terrestrial Reference Frame using Sequential Computation Method Open
JTRF2020 is a recent contribution by NASA Jet Propulsion Laboratory to IERS as part of their effort to determine ITRF2020.  JTRF2020 is estimated daily using a sequential computational method (called "SREF") based on the SRIF and DMCS…
View article: An Insight on Scale Definition in JTRF202
An Insight on Scale Definition in JTRF202 Open
JTRF2020 is the latest TRF solution computed at JPL by assimilating frame input data submitted by the IVS, IGS, ILRS, and IDS for ITRF2020. Determined with SREF (Square-root Reference frame Estimation Filter), a computational code based on…
View article: Improving Combined EOP Series by Jointly Determining Them with the Terrestrial Reference Frame
Improving Combined EOP Series by Jointly Determining Them with the Terrestrial Reference Frame Open
Earth orientation parameters (EOPs) are currently determined from measurements taken by the space-geodetic techniques of SLR, VLBI, GNSS, and DORIS. But each technique has its own unique strengths and weaknesses in this regard. Not only is…
View article: JTRF2020: Results and Next Steps
JTRF2020: Results and Next Steps Open
JPL's newly developed software for determining terrestrial reference frames, known as SREF (Square-root Reference frame Estimation Filter), has been used to produce JTRF2020, a combined terrestrial reference frame determined from the input…
View article: Navigating in the Dark -- Designing Autonomous Driving Features to Assist Old Adults with Visual Impairments
Navigating in the Dark -- Designing Autonomous Driving Features to Assist Old Adults with Visual Impairments Open
Age-related macular degeneration is a leading cause of blindness worldwide and is one of many limitations to independent driving among old adults. Highly autonomous vehicles present a prospective solution for those who are no longer capabl…
View article: High‐Resolution Finite Fault Slip Inversion of the 2019 Ridgecrest Earthquake Using 3D Finite Element Modeling
High‐Resolution Finite Fault Slip Inversion of the 2019 Ridgecrest Earthquake Using 3D Finite Element Modeling Open
The 2019 Ridgecrest earthquake sequence manifested as one of the most complex fault surface ruptures observed in California in modern times. The M6.4 foreshock and M7.1 mainshock occurred on an intricate network of orthogonal and sub‐paral…
View article: A Sequentially Estimated Terrestrial Reference Frame: JTRF2020
A Sequentially Estimated Terrestrial Reference Frame: JTRF2020 Open
<p>JPL's newly developed software for determining terrestrial reference frames, known as SREF (Square-root REference Frame filter), has been used to produce JTRF2020, a combined terrestrial reference frame determined from the input S…
View article: Supplementary dataset for "High-resolution Finite Fault Slip Inversion of the 2019 Ridgecrest Earthquake using 3D Finite Element Modeling."
Supplementary dataset for "High-resolution Finite Fault Slip Inversion of the 2019 Ridgecrest Earthquake using 3D Finite Element Modeling." Open
Supplementary dataset for "High-resolution Finite Fault Slip Inversion of the 2019 Ridgecrest Earthquake using 3D Finite Element Modeling."
View article: Supplementary dataset for "High-resolution Finite Fault Slip Inversion of the 2019 Ridgecrest Earthquake using 3D Finite Element Modeling."
Supplementary dataset for "High-resolution Finite Fault Slip Inversion of the 2019 Ridgecrest Earthquake using 3D Finite Element Modeling." Open
Supplementary dataset for "High-resolution Finite Fault Slip Inversion of the 2019 Ridgecrest Earthquake using 3D Finite Element Modeling."
View article: Supplementary dataset for "High-resolution Finite Fault Slip Inversion of the 2019 Ridgecrest Earthquake using 3D Finite Element Modeling."
Supplementary dataset for "High-resolution Finite Fault Slip Inversion of the 2019 Ridgecrest Earthquake using 3D Finite Element Modeling." Open
Supplementary dataset for "High-resolution Finite Fault Slip Inversion of the 2019 Ridgecrest Earthquake using 3D Finite Element Modeling."
View article: Clustering Analysis Methods for GNSS Observations: A Data‐Driven Approach to Identifying California's Major Faults
Clustering Analysis Methods for GNSS Observations: A Data‐Driven Approach to Identifying California's Major Faults Open
We present a data‐driven approach to clustering or grouping Global Navigation Satellite System (GNSS) stations according to observed velocities, displacements or other selected characteristics. Clustering GNSS stations provides useful scie…
View article: Buried Aseismic Slip and Off‐Fault Deformation on the Southernmost San Andreas Fault Triggered by the 2010 El Mayor Cucapah Earthquake Revealed by UAVSAR
Buried Aseismic Slip and Off‐Fault Deformation on the Southernmost San Andreas Fault Triggered by the 2010 El Mayor Cucapah Earthquake Revealed by UAVSAR Open
We use UAVSAR interferograms to characterize fault slip, triggered by the Mw 7.2 El Mayor‐Cucapah earthquake on the 1 San Andreas Fault in the Coachella Valley providing comprehensive maps of short‐term geodetic surface deformation that co…
View article: Survey of Transverse Range Fire Scars in 10 Years of UAVSAR Polarimetry
Survey of Transverse Range Fire Scars in 10 Years of UAVSAR Polarimetry Open
Because cross‐polarized radar returns are highly associated with volume scatter, radar polarimetry returns tend to show strong evidence of wildfire scars and recovery in forest and chaparral. We focus on the polarimetry images from UAVSAR …
View article: Observing Southern California Landslides Using UAVSAR: La Conchita as a Case Study
Observing Southern California Landslides Using UAVSAR: La Conchita as a Case Study Open
The La Conchita Landslide is infamous for its repeated devastation of the coastal community in Southern California. The landslide caused severe damage and loss of life once in 1995 and 2005. In this study we use UAVSAR interferograms of th…
View article: Clustering Analysis Methods for GNSS Observations: A Data-Driven Approach to Identifying California's Major Faults
Clustering Analysis Methods for GNSS Observations: A Data-Driven Approach to Identifying California's Major Faults Open
Earth and Space Science Open Archive This work has been accepted for publication in Earth and Space Science. Version of RecordESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary. Learn more abo…
View article: Buried Aseismic Slip and Off-Fault Deformation on the Southernmost San Andreas Fault triggered by the 2010 El Mayor Cucapah Earthquake revealed by UAVSAR
Buried Aseismic Slip and Off-Fault Deformation on the Southernmost San Andreas Fault triggered by the 2010 El Mayor Cucapah Earthquake revealed by UAVSAR Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Earth and Space Science. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn more ab…
View article: Survey of Transverse Range Fire Scars in Ten Years of UAVSAR Polarimetry
Survey of Transverse Range Fire Scars in Ten Years of UAVSAR Polarimetry Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Earth and Space Science. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn more ab…
View article: Improving access to geodetic imaging crustal deformation data using GeoGateway
Improving access to geodetic imaging crustal deformation data using GeoGateway Open
GeoGateway ( http://geo-gateway.org ) is a web-based interface for analysis and modeling of geodetic imaging data and to support response to related disasters. Geodetic imaging data product currently supported by GeoGateway include Global …
View article: Survey of Transverse Range Fire Scars in Ten Years of UAVSAR Polarimetry
Survey of Transverse Range Fire Scars in Ten Years of UAVSAR Polarimetry Open
Earth and Space Science Open Archive This preprint has been submitted to and is under consideration at Earth and Space Science. ESSOAr is a venue for early communication or feedback before peer review. Data may be preliminary.Learn more ab…
View article: Automated Estimation and Tools to Extract Positions, Velocities, Breaks, and Seasonal Terms From Daily GNSS Measurements: Illuminating Nonlinear Salton Trough Deformation
Automated Estimation and Tools to Extract Positions, Velocities, Breaks, and Seasonal Terms From Daily GNSS Measurements: Illuminating Nonlinear Salton Trough Deformation Open
This paper describes the methods used to estimate positions, velocities, breaks, and seasonal terms from daily Global Navigation Satellite System (GNSS) measurements. Break detection and outlier removal have been automated so that decades …
View article: Realization of time sequential estimation of terrestrial reference frame using square-root information filter and smoother
Realization of time sequential estimation of terrestrial reference frame using square-root information filter and smoother Open
<p>The JTRF2014 realization of terrestrial reference frame has adopted a weekly time series representation that can track dominant non-linear station motions including periodic and random variations. &#160;The realization is base…
View article: Geocenter Motion from a Combination of GRACE Mascon and SLR Data
Geocenter Motion from a Combination of GRACE Mascon and SLR Data Open
<p>GRACE and GRACE Follow-On (FO) Level 2 data provide quasi-monthly, band-limited estimates of Stokes (geopotential, spherical harmonic) coefficients mostly reflecting surface mass variability due to non-tidal atmosphere, ocean, and…
View article: Temporal variations in ITRF station displacements analyzed with vector spherical harmonics
Temporal variations in ITRF station displacements analyzed with vector spherical harmonics Open
<p>The ITRF2014 candidate solutions DTRF2014 and JTRF2014 provide time-dependent station coordinates accounting for irregular station motions. DTRF2014 by DGFI-TUM expands the secular coordinate model via non-tidal loading correction…
View article: Using Geologic and Geodetic Analyses to Define the Location, Slip Rate, and Geometry of Off Fault Deformation, Hidden Spring Fault Zone, Southern California
Using Geologic and Geodetic Analyses to Define the Location, Slip Rate, and Geometry of Off Fault Deformation, Hidden Spring Fault Zone, Southern California Open
A strain deficit of about 10 mm/yr exists across the San Andreas Fault system on the boundary between the North American and Pacific plates. We investigate the role of the Hidden Spring Fault Zone, east of the Salton Sea in Southern Califo…
View article: Fracture Advancing Step Tectonics Observed in the Yuha Desert and Ocotillo, CA, Following the 2010 M<sub>w</sub>7.2 El Mayor‐Cucapah Earthquake
Fracture Advancing Step Tectonics Observed in the Yuha Desert and Ocotillo, CA, Following the 2010 M<sub>w</sub>7.2 El Mayor‐Cucapah Earthquake Open
Uninhabited aerial vehicle synthetic aperture radar (UAVSAR) observations 2009–2017 of the Yuha Desert area and Global Positioning System (GPS) time series encompassing the region reveal a northward migrating pattern of deformation followi…
View article: UAVSAR and Optical Analysis of the Thomas Fire Scar and Montecito Debris Flows: Case Study of Methods for Disaster Response Using Remote Sensing Products
UAVSAR and Optical Analysis of the Thomas Fire Scar and Montecito Debris Flows: Case Study of Methods for Disaster Response Using Remote Sensing Products Open
We use the 2017 Thomas fire and ensuing Montecito debris flow as a case study to demonstrate how application of various interferometric synthetic aperture radar postprocessing techniques can be used to highlight the fire scar and major dam…