Spherical Multi-Cell Mesh (Projected)

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

📋 Summary

Creates a mesh from 2-D latitude and longitude unstructured cell bounds.

The resulting mesh contains quad cells.

It uses WAVEWATCH III (WW3) unstructured Spherical Multi-Cell (SMC) sea surface wave significant height data located on mesh faces/cells.

Note that, a threshold is also applied to remove land NaN cells, and a Natural Earth base layer is rendered along with Natural Earth coastlines. The mesh is also transformed to the Sinusoidal (Sanson-Flamsteed) pseudo-cylindrical projection.

🏷 Tags: Coastlines Projection Unstructured Texture Threshold

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Static Scene

Interactive Scene

from __future__ import annotations

import geovista as gv
from geovista.pantry.data import ww3_global_smc
import geovista.theme


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

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

    """
    # Load the sample data.
    sample = ww3_global_smc()

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

    # Threshold the mesh of NaNs.
    mesh = mesh.threshold()

    # Plot the unstructured mesh.
    crs = "+proj=sinu"
    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_hypsometric())
    plotter.add_coastlines()
    plotter.add_axes()
    plotter.add_text(
        f"WW3 Spherical Multi-Cell ({crs})",
        position="upper_left",
        font_size=10,
        shadow=True,
    )
    plotter.view_xy()
    plotter.camera.zoom(1.5)
    plotter.show()


if __name__ == "__main__":
    main()