DOC: Add xradar gridding example (#1470)

examples/xradar/plot_grid_xradar.py

@@ -0,0 +1,40 @@
+"""
+==================================
+Plot a PPI Using Xradar and Py-ART
+==================================
+
+An example which uses xradar and Py-ART to grid a PPI file.
+
+"""
+
+# Author: Max Grover ([email protected])
+# License: BSD 3 clause
+
+
+import xradar as xd
+
+import pyart
+from pyart.testing import get_test_data
+
+# Locate the test data and read in using xradar
+filename = get_test_data("swx_20120520_0641.nc")
+tree = xd.io.open_cfradial1_datatree(filename)
+
+# Give the tree Py-ART radar methods
+radar = pyart.xradar.Xradar(tree)
+
+# Grid using 11 vertical levels, and 101 horizontal grid cells at a resolution on 1 km
+grid = pyart.map.grid_from_radars(
+    (radar,),
+    grid_shape=(11, 101, 101),
+    grid_limits=(
+        (0.0, 10_000),
+        (-50_000.0, 50_000.0),
+        (-50_000, 50_000.0),
+    ),
+)
+
+display = pyart.graph.GridMapDisplay(grid)
+display.plot_grid(
+    "reflectivity_horizontal", level=0, vmin=-20, vmax=60, cmap="ChaseSpectral"
+)