Merge pull request #457 from NCAR/taylor_2

Creating taylor_2 example

Gallery/TaylorDiagrams/NCL_taylor_2.py

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+"""
+NCL_taylor_2.py
+===============
+Concepts illustrated:
+  - Creating a simple Taylor Diagram
+  - Adding background options for the diagram
+
+See following URLs to see the reproduced NCL plot & script:
+    - Original NCL script: https://www.ncl.ucar.edu/Applications/Scripts/taylor_2.ncl
+    - Original NCL plot: https://www.ncl.ucar.edu/Applications/Images/taylor_2_lg.png
+
+Note: Due to to limitations of matplotlib's axisartist toolkit, we cannot include minor tick marks
+        between 0.9 and 0.99, as seen in the original NCL plot.
+"""
+
+###############################################################################
+# Import packages:
+
+import matplotlib.pyplot as plt
+import numpy as np
+
+import geocat.viz as gv
+
+###############################################################################
+# Create dummy data:
+
+# p dataset
+pstddev = [0.6, 0.5, 0.45, 0.75, 1.15]  # standard deviation
+pcorrcoef = [0.24, 0.75, 1, 0.93, 0.37]  # correlation coefficient
+
+# t dataset
+tstddev = [0.75, 0.64, 0.4, 0.85, 1.15]
+tcorrcoef = [0.24, 0.75, 0.47, 0.88, 0.73]
+
+###############################################################################
+# Plot
+
+# Create figure and Taylor Diagram instance
+fig = plt.figure(figsize=(12, 12))
+dia = gv.TaylorDiagram(fig=fig, label='REF')
+ax = plt.gca()
+
+# Add model sets for p and t datasets
+dia.add_model_set(
+    pstddev,
+    pcorrcoef,
+    fontsize=20,
+    xytext=(-5, 10),  # marker label location, in pixels
+    color='red',
+    marker='o',
+    facecolors='none',
+    s=100)  # marker size
+dia.add_model_set(
+    tstddev,
+    tcorrcoef,
+    fontsize=20,
+    xytext=(-5, 10),  # marker label location, in pixels
+    color='blue',
+    marker='D',
+    facecolors='none',
+    s=100)
+
+# Add RMS contours, and label them
+dia.add_contours(levels=np.arange(0, 1.1, 0.25),
+                 colors='lightgrey',
+                 linewidths=0.5)
+
+# Add y axis grid
+dia.add_ygrid(np.array([0.5, 1.5]), color='grey')
+
+# Add x axis grid
+dia.add_xgrid(np.array([0.6, 0.9]))
+
+# Add figure title
+plt.title("Example", size=26, pad=45)
+
+# Show the plot
+plt.show()

Gallery/TaylorDiagrams/README.rst

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+.. _taylor_diagrams_examples:
+
+.. _taylor-diagrams-index:
+
+Taylor Diagrams
+===============