Tile maps

The pygmt.Figure.tilemap method allows to plot tiles from a tile server or local file as a basemap or overlay.

import contextily
import pygmt

fig = pygmt.Figure()
fig.tilemap(
    region=[-157.84, -157.8, 21.255, 21.285],
    projection="M12c",
    # Set level of details (0-22)
    # Higher levels mean a zoom level closer to the Earth's
    # surface with more tiles covering a smaller
    # geographic area and thus more details and vice versa
    # Please note, not all zoom levels are always available
    zoom=14,
    # Use tiles from OpenStreetMap tile server
    source="https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png",
    frame="afg",
)

fig.show()

grdimage [WARNING]: (w - x_min) must equal (NX + eps) * x_inc), where NX is an integer and |eps| <= 0.0001.
grdimage [WARNING]: w reset from -157.84 to -157.840070056
grdimage [WARNING]: (e - x_min) must equal (NX + eps) * x_inc), where NX is an integer and |eps| <= 0.0001.
grdimage [WARNING]: e reset from -157.8 to -157.799990801
grdimage [WARNING]: (s - y_min) must equal (NY + eps) * y_inc), where NY is an integer and |eps| <= 0.0001.
grdimage [WARNING]: s reset from 21.255 to 21.2549765742
grdimage [WARNING]: (n - y_min) must equal (NY + eps) * y_inc), where NY is an integer and |eps| <= 0.0001.
grdimage [WARNING]: n reset from 21.285 to 21.2850360149

It’s also possible to use tiles provided via the contextily library. See Contextily providers for a list of possible tilemap options.

fig = pygmt.Figure()
fig.tilemap(
    region=[-157.84, -157.8, 21.255, 21.285],
    projection="M12c",
    # Use the CartoDB Positron option from contextily
    source=contextily.providers.CartoDB.Positron,
    frame="afg",
)

fig.show()

grdimage [WARNING]: (w - x_min) must equal (NX + eps) * x_inc), where NX is an integer and |eps| <= 0.0001.
grdimage [WARNING]: w reset from -157.84 to -157.840016369
grdimage [WARNING]: (e - x_min) must equal (NX + eps) * x_inc), where NX is an integer and |eps| <= 0.0001.
grdimage [WARNING]: e reset from -157.8 to -157.799990966
grdimage [WARNING]: (s - y_min) must equal (NY + eps) * y_inc), where NY is an integer and |eps| <= 0.0001.
grdimage [WARNING]: s reset from 21.255 to 21.2549741829
grdimage [WARNING]: (n - y_min) must equal (NY + eps) * y_inc), where NY is an integer and |eps| <= 0.0001.
grdimage [WARNING]: n reset from 21.285 to 21.2850347554