Note
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Ternary diagram
The pygmt.Figure.ternary
method can draw ternary diagrams. The example
shows how to plot circles with a diameter of 0.1 centimeters
(style="c0.1c"
) on a 10-centimeter-wide (width="10c"
) ternary diagram
at the positions listed in the first three columns of the sample dataset
rock_compositions
, with default annotations and gridline spacings, using
the specified labeling defined via alabel
, blabel
, and clabel
.
Points are colored based on the values given in the fourth columns of the
sample dataset via cmap=True
.
![ternary](../../_images/sphx_glr_ternary_001.png)
import pygmt
fig = pygmt.Figure()
# Load sample data
data = pygmt.datasets.load_sample_data(name="rock_compositions")
# Define a colormap to be used for the values given in the fourth column
# of the input dataset
pygmt.makecpt(cmap="batlow", series=[0, 80, 10])
fig.ternary(
data,
region=[0, 100, 0, 100, 0, 100],
width="10c",
style="c0.1c",
alabel="Limestone",
blabel="Water",
clabel="Air",
cmap=True,
frame=[
"aafg+lLimestone component+u %",
"bafg+lWater component+u %",
"cagf+lAir component+u %",
],
)
# Add a colorbar indicating the values given in the fourth column of
# the input dataset
fig.colorbar(position="JBC+o0c/1.5c", frame=["x+lPermittivity"])
fig.show()
Total running time of the script: (0 minutes 0.202 seconds)