label_global_map.py

def label_global_map(fig, ax, xticks, yticks, xoff=-10, yoff=-10, degree=False, **text_kw):
    """Label gridlines of a global cartopy map."""
    geodetic_trans = ccrs.Geodetic()
    xlab_kw = ylab_kw = dict(va="center", ha="center", **text_kw)
    for xtick in xticks:
        s = format_lonlat(xtick, "lon", degree=degree)
        text_transform = offset_copy(
            geodetic_trans._as_mpl_transform(ax), fig=fig, units="points", x=0, y=yoff
        )
        ax.text(xtick, -90, s, transform=text_transform, **xlab_kw)

    for ytick in yticks:
        s = format_lonlat(ytick, "lat", degree=degree)
        text_transform = offset_copy(
            geodetic_trans._as_mpl_transform(ax), fig=fig, units="points", x=xoff, y=0
        )
        ax.text(-180, ytick, s, transform=text_transform, **ylab_kw)