Add gallery example for grdlandmask

examples/gallery/images/grdlandmask.py

@@ -0,0 +1,25 @@
+"""
+Create 'wet-dry' mask grid
+--------------------------
+The :meth:`pygmt.grdlandmask` method allows setting 
+all nodes on land or water to a specified value using
+the ``maskvalues`` parameter. 
+"""
+
+import pygmt
+
+fig = pygmt.Figure()
+
+# Define region of interest
+region = [-65, -40, -40, -20]
+
+# Assign a value of 0 for all water masses and a value of 1 for all land masses
+grid = pygmt.grdlandmask(region=region, spacing="5m", maskvalues=[0, 1], resolution="l")
+
+# Plot clipped grid
+fig.basemap(region=region, projection="M12c", frame=True)
+
+fig.grdimage(grid=grid, cmap="lajolla")
+fig.colorbar(position="JMR+o0.5c/0c+w8c")
+
+fig.show()