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PYACS is a python library to handle GPS/GNSS solution, perform GNSS time series and velocity field analysis

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PYACS

PYACS is a set of scripts and python modules for analyzing and modeling geodetic data. PYACS includes 4 components:

  • a set a core packages handling coordinates, time, estimators, format conversions

  • pyacs_make_time_series.py is a script to express free GNSS solutions in a single reference frame and produce time series

  • the Gts module allows versatile time series analysis either for individual or for a group of time series.

  • a package dedicated to GNSS velocity fields analysis, including Euler pole calculation and basic strain rate analysis

Installation

PYACS works well under Anaconda with python >= 3.8. Get the latest version of PYACS from the release directory and install it with pip.

pip install pyacs-XXX.tar.gz

You might prefer to install it under a dedicated conda virtual env

conda create -n env_pyacs python=3.9 ipython
conda activate env_pyacs
pip install pyacs-XXX.tar.gz

ipyacs.py is a useful script for interactive time series visualization and analysis under ipython. It is convenient to add an alias in your shell configuration file

alias ipyacs='ipython `which ipyacs.py` -i'

Documentation

A documentation is available here. Report bug or desired enhancement in the Github issues.

Authors

PYACS has been developed by Jean-Mathieu Nocquet and Dinh Trong Tran as part of his PhD.

A few studies which have used PYACS

  • Cruz-Atienza, Víctor M., et al. "Short-term interaction between silent and devastating earthquakes in Mexico." Nature communications 12.1 (2021): 1-14.
  • Bontemps, Noélie, et al. "Rain and small earthquakes maintain a slow-moving landslide in a persistent critical state." Nature communications 11.1 (2020): 1-10.
  • Klein, Emilied, et al. "Interplay of seismic and a-seismic deformation during the 2020 sequence of Atacama, Chile." Earth and Planetary Science Letters 570 (2021): 117081.
  • Bletery, Quentin, and Jean-Mathieu Nocquet. "Slip bursts during coalescence of slow slip events in Cascadia." Nature communications 11.1 (2020): 1-6.
  • Rolandone, Frédérique, et al. "Areas prone to slow slip events impede earthquake rupture propagation and promote afterslip." Science advances 4.1 (2018): eaao6596.
  • Socquet, Anne, et al. "An 8 month slow slip event triggers progressive nucleation of the 2014 Chile megathrust." Geophysical Research Letters 44.9 (2017): 4046-4053.

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PYACS is a python library to handle GPS/GNSS solution, perform GNSS time series and velocity field analysis

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