gplately 1.3.0

Object-orientated Python interface to pyGPlates for plate tectonic reconstruction

GPlately was created to accelerate spatio-temporal data analysis leveraging pyGPlates and PlateTectonicTools within a simplified Python interface. This object-oriented package enables the reconstruction of data through deep geologic time (points, lines, polygons, and rasters), the interrogation of plate kinematic information (plate velocities, rates of subduction and seafloor spreading), the rapid comparison between multiple plate motion models, and the plotting of reconstructed output data on maps. All tools are designed to be parallel-safe to accelerate spatio-temporal analysis over multiple CPU processors.

GPlately requires a working installation of pyGPlates, which is freely available at https://www.gplates.org/download. All major system architectures (e.g. Linux, MacOS, Windows) are supported and installation instructions are well documented. Sample data is also available from EarthByte servers, which includes rasters, seafloor age grids, rotation files, and more to get started with plate reconstructions.

Citation

Mather, B.R., Müller, R.D., Zahirovic, S., Cannon, J., Chin, M., Ilano, L., Wright, N.M., Alfonso, C., Williams, S., Tetley, M., Merdith, A. (2023) Deep time spatio-temporal data analysis using pyGPlates with PlateTectonicTools and GPlately. Geoscience Data Journal, 1–8. Available from: https://doi.org/10.1002/gdj3.185

@article{Mather2023,
author = {Mather, Ben R. and Müller, R. Dietmar and Zahirovic, Sabin and Cannon, John and Chin, Michael and Ilano, Lauren and Wright, Nicky M. and Alfonso, Christopher and Williams, Simon and Tetley, Michael and Merdith, Andrew},
title = {Deep time spatio-temporal data analysis using pyGPlates with PlateTectonicTools and GPlately},
year = {2023},
journal = {Geoscience Data Journal},
pages = {1-8},
keywords = {geospatial, plate reconstructions, pyGPlates, python, tectonics},
doi = {https://doi.org/10.1002/gdj3.185},
url = {https://rmets.onlinelibrary.wiley.com/doi/abs/10.1002/gdj3.185},
eprint = {https://rmets.onlinelibrary.wiley.com/doi/pdf/10.1002/gdj3.185},
}

Dependencies

• pyGPlates
• plate-model-manager >= 1.2.0
• Shapely
• NumPy > 1.16
• SciPy > 1.0
• Matplotlib
• Cartopy (for mapping)
• Shapely
• Pooch
• GeoPandas
• netCDF4

Installation

1. Using conda (recommended)

You can install the latest stable public release of GPlately and all of its dependencies using conda. This is the preferred method to install GPlately which downloads binaries from the conda-forge channel.

conda install -c conda-forge gplately

Creating a new conda environment

We recommend creating a new conda environment inside which to install GPlately. This avoids any potential conflicts in your base Python environment. In the example below we create a new environment called "my-env":

conda create -n my-env
conda activate my-env
conda install -c conda-forge gplately

my-env needs to be activated whenever you use GPlately: i.e. conda activate my-env.

2. Using pip

Alternatively, you can install the latest stable public release of GPlately using the pip package manager.

pip install gplately

or from this GitHub repository:

pip install git+https://github.com/GPlates/gplately.git

Pull from repository

First-time installation: To install the latest version of GPlately from a specific repository branch (e.g. master), copy the following commands into your terminal:

cd /path/to/desired/directory #Change your command directory to where you'd like to clone GPlately
git clone https://github.com/GPlates/gplately.git
cd gplately # navigate within the gplately folder
git checkout master # or the name of whichever branch you need
git pull # fetch all recent changes from this branch
pip install .

Update installation from cloned repo: To update your installation of GPlately by fetching the latest pushes from a specific repository branch (e.g. master), copy the following commands into your terminal:

cd /path/to/gplately/directory #Should be where gplately is cloned - must end in /.../gplately
git checkout master # or the name of whichever branch you need
git pull # fetch all recent changes from this branch
pip install .

Usage

GPlately uses objects to accomplish a variety of common tasks. The common objects include:

• DataServer - download rotation files and topology features from plate models on EarthByte's webDAV server
• PlateModelManager - download and manage the plate reconstruction model files
• PlateReconstruction - reconstruct features, tesselate mid ocean ridges, subduction zones
• Points - partition points onto plates, rotate back through time
• Raster - read in NetCDF grids, interpolation, resampling
• PlotTopologies - one stop shop for plotting ridges, trenches, subduction teeth

The DataServer object

GPlately's DataServer object can be used to download:

• rotation models
• topology features
• static polygons
• coastlines
• continents
• continent-ocean boundaries
• age grids and rasters
• geological feature data

from assorted plate reconstruction models. These files are needed to construct most of GPlately's objects. For example, we can download a rotation model, a set of topology features and some static polygons from the Müller et al. 2019 global Mesozoic–Cenozoic deforming plate motion model.

gDownload = gplately.DataServer("Muller2019")
rotation_model, topology_features, static_polygons = gDownload.get_plate_reconstruction_files()

The PlateModelManager object

... was designed as a substitute of DataServer object. The PlateModelManager object can be used to download and manage the plate reconstruction model files.

  pm_manager = PlateModelManager()
  model = pm_manager.get_model("Muller2019")
  model.set_data_dir("plate-model-repo")

  recon_model = PlateReconstruction(
      model.get_rotation_model(),
      topology_features=model.get_layer("Topologies"),
      static_polygons=model.get_layer("StaticPolygons"),
  )
  gplot = PlotTopologies(
      recon_model,
      coastlines=model.get_layer("Coastlines"),
      COBs=model.get_layer("COBs"),
      time=55,
  )

The PlateReconstruction object

... contains methods to reconstruct the positions of present-day feature data back through geological time. You can also use it to calculate plate model data like topological plate velocities, or total trench and ridge lengths per Ma! You can create the object by passing a rotation model, a set of topology features and some static polygons:

model = gplately.PlateReconstruction(rotation_model, topology_features, static_polygons)

Launch the Plate Reconstruction notebook to see more.

The Points object

... can be used to reconstruct the positions of geological point features and calculate their underlying plate velocities through geological time.

pt_lon = np.array([-107.662152, -58.082792, 17.483189, 133.674590, 80.412876])
pt_lat = np.array([48.797807, -12.654857, 11.884395, -26.415630, 31.368509])

# Call the Points object: pass the PlateReconstruction object, and the latitudes and longitudes of the seed points!
gpts = gplately.Points(model, pt_lon, pt_lat)

The Raster object

...can be used to read, resample and resize assorted raster data like netCDF4 seafloor age grids, continental grids and ETOPO relief rasters. You can also reconstruct raster data back through geological time!

etopo = gdownload.get_raster("ETOPO1_tif")

raster = gplately.Raster(
    model,
    data=etopo,
    time=0,
    origin="upper",
)
white_rgb = (255, 255, 255)  # RGB code for white, to fill gaps in output

reconstructed = raster.reconstruct(
    time=50,
    fill_value=white_rgb,
    threads=4,
)

Below is a plot of the ETOPO1 global relief raster at present day, and reconstructed to 50Ma:

The PlotTopologies object

... can be used to visualise reconstructed feature geometries through time. To call the object, pass a set of continents, coastlines and COBs (either as file paths or as <pyGPlates.FeatureCollection> objects), as well as a PlateReconstruction object, and a reconstruction time.

coastlines, continents, COBs = gDownload.get_topology_geometries()
time = 50 #Ma
gPlot = gplately.plot.PlotTopologies(model, time, coastlines, continents, COBs)

Below are some continents, coastlines, COBs, ridges and transforms, trenches, subduction teeth and seafloor age grids plotted using PlotTopologies!

Sample workflows

To see GPlately in action, launch a Jupyter Notebook environment and check out the sample notebooks:

• 01 - Getting Started: A brief overview of how to initialise GPlately's main objects
• 02 - Plate Reconstructions: Setting up a PlateReconstruction object, reconstructing geological data through time
• 03 - Working with Points: Setting up a Points object, reconstructing seed point locations through time with. This notebook uses point data from the Paleobiology Database (PBDB).
• 04 - Velocity Basics: Calculating plate velocities, plotting velocity vector fields
• 05 - Working with Feature Geometries: Processing and plotting assorted polyline, polygon and point data from GPlates 2.3's sample data sets
• 06 - Rasters: Reading, resizing, resampling raster data, and linearly interpolating point data onto raster data
• 07 - Plate Tectonic Stats: Using PlateTectonicTools to calculate and plot subduction zone and ridge data (convergence/spreading velocities, subduction angles, subduction zone and ridge lengths, crustal surface areas produced and subducted etc.)
• 08 - Predicting Slab Flux: Predicting the average slab dip angle of subducting oceanic lithosphere.
• 09 - Motion Paths and Flowlines: Using pyGPlates to create motion paths and flowines of points on a tectonic plate to illustrate the plate's trajectory through geological time.
• 10 - SeafloorGrid: Defines the parameters needed to set up a SeafloorGrid object, and demonstrates how to produce age and spreading rate grids from a set of plate reconstruction model files.

API Documentation

Documentation of GPlately's objects and methods can be found here!

Command Line Tools

GPlately comes with a suite of useful command line tools. These tools are designed as GPlately subcommands. Run gplately -h to show the list of tools.

• combine

  Combine multiple feature collections into one. Run gplately combine -h for details.

• filter

  Filter feature collection by various criteria. See scripts/test_feature_filter.sh for usage examples. Run glately filter -h for details.

• agegrid (ag)

  Create age grids for a plate model. Run glately agegrid -h for details.

• fix_crossovers

  Loads one or more input rotation files, fixes any crossovers and saves the rotations to output rotation files. Run gplately fix_crossovers -h for details.

• remove_rotations

  Remove one or more plate IDs from a rotation model (consisting of one or more rotation files). Run gplately remove_rotations -h for details.

• cleanup_topologies

  Remove any regular features not referenced by topological features. Run gplately cleanup_topologies -h for details.

• convert_xy_to_gplates

  Converts geometry in one or more input ascii files (such as '.xy' files) to output files suitable for loading into GPlates. Run gplately convert_xy_to_gplates -h for details.

• diagnose_rotations

  Diagnose one or more rotation files to check for inconsistencies. Run gplately diagnose_rotations -h for details.

• resolve_topologies

  Resolve topological plate polygons (and deforming networks) and saves (to separate files) the resolved topologies, and their boundary sections as subduction zones, mid-ocean ridges (ridge/transform) and others (not subduction zones or mid-ocean ridges). Run gplately resolve_topologies -h for details.

• rotation_tools

  Calculate stage rotations between consecutive finite rotations in plate pairs. Run gplately rotation_tools -h for details.

• separate_ridge_transform_segments

  Split the geometries of isochrons and mid-ocean ridges into ridge and transform segments. Run gplately separate_ridge_transform_segments -h for details.

• subduction_convergence

  Find the convergence rates along trenches (subduction zones) over time. Run gplately subduction_convergence -h for details.

• gpmdb

  Retrieve paleomagnetic data from https://www.gpmdb.net, create GPlates-compatible VGP features and save the VGP features in a .gpmlz file. Run gplately gpmdb -h for details.