LFRic Mesh (Projected)

This example demonstrates how to render a projected unstructured quadrilateral mesh.

📋 Summary

Creates a mesh from 1-D latitude and longitude unstructured cell points.

The resulting mesh contains quad cells and is constructed from CF UGRID unstructured cell points and connectivity.

It uses an unstructured Met Office LFRic C48 cubed-sphere of surface temperature data located on the mesh faces/cells.

Note that, a threshold is also applied to remove land NaN cells. A Natural Earth base layer is also rendered along with Natural Earth coastlines and a graticule. The mesh is also transformed to the Bonne projection.

🏷 Tags: Coastlines Graticule Projection Unstructured Texture Threshold

---

Static Scene

Interactive Scene

from __future__ import annotations

import geovista as gv
from geovista.pantry.data import lfric_sst
import geovista.theme


def main() -> None:
    """Plot a projected LFRic unstructured mesh.

    Notes
    -----
    .. versionadded:: 0.1.0

    """
    # Load the sample data.
    sample = lfric_sst()

    # Create the mesh from the sample data.
    mesh = gv.Transform.from_unstructured(
        sample.lons,
        sample.lats,
        connectivity=sample.connectivity,
        data=sample.data,
    )

    # Remove cells from the mesh with NaN values.
    mesh = mesh.threshold()

    # Plot the unstructured mesh.
    crs = "+proj=bonne +lat_1=10 +lon_0=180"
    plotter = gv.GeoPlotter(crs=crs)
    sargs = {"title": f"{sample.name} / {sample.units}", "shadow": True}
    plotter.add_mesh(mesh, scalar_bar_args=sargs)
    plotter.add_base_layer(texture=gv.natural_earth_1())
    plotter.add_coastlines()
    plotter.add_graticule()
    plotter.add_axes()
    plotter.add_text(
        f"LFRic C48 Unstructured Cube-Sphere ({crs})",
        position="upper_left",
        font_size=10,
        shadow=True,
    )
    plotter.view_xy()
    plotter.camera.zoom(1.5)
    plotter.show()


if __name__ == "__main__":
    main()