Comparisons of OPUS and PPP Solutions for Subsidence Monitoring in the Greater Houston Area

Wang, Guoquan; Turco, Michael J.; Soler, Tomás; Kearns, Timothy J.; Welch, Jennifer L.

doi:10.1061/(asce)su.1943-5428.0000241

Cited by 36 publications

(23 citation statements)

References 51 publications

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“…A group of common points, known as reference stations, are used to link these two reference frames. A stable Houston reference frame was initially established in 2013 and tied to the International GNSS Service (IGS) Reference Frame 2008 (Wang et al, 2013). The regional reference frame firstly provided a platform to integrate long-history GPS datasets collected by number of agencies in various areas with different equipment into a uniform reference frame.…”

Section: Reference Stationsmentioning

confidence: 99%

GPS geodetic infrastructure for subsidence and fault monitoring in Houston, Texas, USA

Agudelo

Wang

et al. 2020

Proc. IAHS

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Houston, Texas, is one of the earliest urban areas to employ Global Positioning System (GPS) technology for land subsidence and fault monitoring. As of 2020, the University of Houston and the Harris-Galveston Subsidence District have integrated over 230 permanent GPS stations into their routine GPS data processing for regional subsidence and fault monitoring. This article summarizes the GPS geodetic infrastructure in the Greater Houston region. The infrastructure is comprised of two components: a dense GPS network (HoustonNet) and a stable regional reference frame (Houston20). Houston20 is realized by 25 long-history ( > 8 years) continuous GPS stations located outside the subsiding area and is aligned in origin and scale with the International GNSS Reference Frame 2014 (IGS14). The stability of the regional reference frame is below 1 mm yr −1 in all three directions. GPS-derived ground deformation rates (2010-2019) within the Greater Houston region are also presented in this article.

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Section: Reference Stationsmentioning

confidence: 99%

GPS geodetic infrastructure for subsidence and fault monitoring in Houston, Texas, USA

Agudelo

Wang

et al. 2020

Proc. IAHS

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“…A seasonal ground deformation model (vertical) in north China was developed by Wang et al (2018) based on longperiod GPS observations at weathered bedrock sites, which can be described as:…”

Section: Comparisons Of the Maximum Subsidence Rates In Tianjin Housmentioning

confidence: 99%

“…Map showing the locations of 260 permanent GPS stations (red) of the Crustal Movement Observational Network of China (CMONOC) and 12 reference stations (yellow) utilized to realize the stable North China Reference Frame 2016 (NChina16,Wang et al, 2018).…”

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Rapid Land Subsidence in Tianjin, China Derived from Continuous GPS Observations (2010–2019)

Zhao

Wang

et al. 2020

Proc. IAHS

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We have delineated ten years of urban subsidence derived from continuous GPS stations operated by the Crustal Movement Observational Network of China (CMONOC) within and adjacent to the municipality of Tianjin. A method for obtaining accurate site velocities with respect to a stable regional reference frame is described. CMONOC stations in Jizhou (JIXN) and Baodi (TJBD) districts recorded minor subsidence of approximately 1 to 2 mm yr −1 during the period from 2010 to 2019. One station in Wuqing (TJWQ) district and one station in Binhai (TJBH) district recorded steady subsidence of approximately 5 and 2 cm yr −1 from 2010 to 2019, respectively. One station in Cangzhou (HECX) of Hebei Province, adjacent to Tianjin, recorded steady subsidence of approximately 2.4 cm yr −1 during 2010-2014 and more rapid subsidence of 4 cm yr −1 since 2015. TJWQ recorded the most rapid land subsidence and the most significant seasonal ground oscillations (uplift and subsidence) among these five stations. This study indicates that subsidence rates in Tianjin vary significantly in space and time. Particular attention should be paid, therefore, to extrapolate or infer a rate of subsidence for an area on the basis of a subsidence rate obtained from previous GPS observations or proximal GPS sites. The subsidence time series presented in this study provide reliable "ground truth" and constraints for calibrating or validating subsidence estimations from numerical modeling and repeated surveys using other remote sensing techniques, such as Interferometric Synthetic Aperture Radar (InSAR).

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“…Considering this and taking into account weak points, such as observation session length, we set up a different experiment. First of all, we extend the observation session duration of campaign measurements to 24 h. We use GNSS time series as short as four years in which the ground deformation has been found to be detectable [17,25]. The data is sampled once every four months in a year considering practical needs.…”

mentioning

confidence: 99%

“…We then tested the significance of the velocity derived from monthly repeated GPS surveys against the velocity obtained from the continuous data. deformation has been found to be detectable [17,25]. The data is sampled once every four months in a year considering practical needs.…”

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confidence: 99%

Accuracy of Deformation Rates from Campaign GPS Surveys Considering Extended Observation Session and Antenna Set-Up Errors

Turen

Şanli

2019

Remote Sensing

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GPS campaign measurements are still in use in the monitoring of ground deformation. Campaign measurements are frequently referred to because installing permanent stations are costly, and they cannot be installed at the desired density. Using the data from the International Global Navigation Satellite Systems (GNSS) Service (IGS) permanent GPS stations, the duration, sampling interval, etc. of the campaign measurements can be simulated. Thus, the contribution of the campaign data to the monitoring of the ground deformation can be evaluated. In this study, we carried out an experiment with the aim of determining the deformation of tectonic plates at the selected IGS stations more accurately considering by extending the observation duration to a full 24 h length. We also made an attempt to take into consideration the antenna set up errors developing a scenario referring to the information available in the literature. We have decimated the continuous data of 40 globally scattered IGS stations into monthly intervals between 2012 and 2016 and estimated the deformation rates at the IGS stations from a continuous time series of four years. The continuous time series solutions for those stations were produced by the Jet Propulsion Laboratory (JPL), NASA. We compare velocities (i.e., the deformation rates) determined from GPS campaigns (in which the sampling was performed monthly and four-monthly) with those of the continuous data. The major conclusion of this study is that the vertical velocity estimation accuracy of the GPS campaign measurements had been improved by about 85% by extending the session duration to 24 h. The repetition interval of GPS campaign measurements as per one observation every four months produced only slightly coarser accuracy (i.e., on the average 8% poorer) than those of the measurements repeated once every month.

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Comparisons of OPUS and PPP Solutions for Subsidence Monitoring in the Greater Houston Area

Cited by 36 publications

References 51 publications

GPS geodetic infrastructure for subsidence and fault monitoring in Houston, Texas, USA

GPS geodetic infrastructure for subsidence and fault monitoring in Houston, Texas, USA

Rapid Land Subsidence in Tianjin, China Derived from Continuous GPS Observations (2010–2019)

Accuracy of Deformation Rates from Campaign GPS Surveys Considering Extended Observation Session and Antenna Set-Up Errors

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