spilhaus

Project your maritime data onto the World Ocean.

To know more about the Spilhaus projection, see:

• Ocean Sciences with the Spilhaus Projection: A Seamless Ocean Map for Spatial Data Recognition

Currently, the Spilhaus projection is missing in PROJ, making it unavailable for R and Python enthusiasts, among others: OSGeo/PROJ#1851. This repo contains four scripts:

• spilhaus.R and spilhaus.py, which contain the main functions that you may want to use, and
• example.R and example.py, which demonstrate how to use the functions to create and plot a dataset using the Spilhaus projection.

In spilhaus.*, the functions

• from_lonlat_to_spilhaus_xy and
• from_spilhaus_xy_to_lonlat

let you move between Mercator and Spilhaus projections; the function

• make_spilhaus_xy_gridpoints

lets you create a square grid of Spilhaus coordinates; and the function

• prettify_spilhaus_df

cleans the Spilhaus dataframe and moves a few pixels around (bottom/top and left/right) to make a contiguous ocean.