Add NDBC simple web service

docs/api/simplewebservice.rst

@@ -20,16 +20,23 @@
    :members:
    :special-members: __init__
 
-======================================
+====================================
 :mod:`siphon.simplewebservice.igra2`
-======================================
+====================================
 .. automodule:: siphon.simplewebservice.igra2
    :members:
    :special-members: __init__
 
-======================================
+===================================
 :mod:`siphon.simplewebservice.acis`
-======================================
+===================================
 .. automodule:: siphon.simplewebservice.acis
+   :members:
+   :special-members: __init__
+
+===================================
+:mod:`siphon.simplewebservice.ndbc`
+===================================
+.. automodule:: siphon.simplewebservice.ndbc
    :members:
    :special-members: __init__

docs/installguide.rst

@@ -14,7 +14,7 @@ This includes:
 * Core Python developers will
   `stop support for Python 2.7 January 1, 2020 <https://pythonclock.org/>`_
 * NumPy feature releases will be
-  `Python 3 only starting January 1, 2019 <https://docs.scipy.org/doc/numpy/neps/dropping-python2.7-proposal.html>`_,
+  `Python 3 only starting January 1, 2019 <http://www.numpy.org/neps/nep-0014-dropping-python2.7-proposal.html>`_,
   and support for the last release supporting Python 2 will end January 1, 2020.
 * XArray will drop
   `2.7 January 1, 2019 as well <https://github.com/pydata/xarray/issues/1830>`_

examples/ndbc/README.txt

@@ -0,0 +1,7 @@
+.. _ndbc_examples:
+
+National Data Buoy Center (NDBC)
+--------------------------------
+
+Examples of requesting data from the National Data Buoy Center latest and realtime
+data sources.

examples/ndbc/buoy_met_request.py

@@ -0,0 +1,42 @@
+# Copyright (c) 2018 Siphon Contributors.
+# Distributed under the terms of the BSD 3-Clause License.
+# SPDX-License-Identifier: BSD-3-Clause
+"""
+NDBC Buoy Meteorological Data Request
+=====================================
+
+The NDBC keeps a 45-day recent rolling file for each buoy. This examples shows how to access
+the basic meteorological data from a buoy and make a simple plot.
+"""
+
+import matplotlib.pyplot as plt
+
+from siphon.simplewebservice.ndbc import NDBC
+
+####################################################
+# Get a pandas data frame of all of the observations, meteorological data is the default
+# observation set to query.
+df = NDBC.realtime_observations('41002')
+df.head()
+
+####################################################
+# Let's make a simple time series plot to checkout what the data look like.
+fig, (ax1, ax2, ax3) = plt.subplots(3, 1, figsize=(12, 10))
+ax2b = ax2.twinx()
+
+# Pressure
+ax1.plot(df['time'], df['pressure'], color='black')
+ax1.set_ylabel('Pressure [hPa]')
+
+# Wind speed, gust, direction
+ax2.plot(df['time'], df['wind_speed'], color='tab:orange')
+ax2.plot(df['time'], df['wind_gust'], color='tab:olive', linestyle='--')
+ax2b.plot(df['time'], df['wind_direction'], color='tab:blue', linestyle='-')
+ax2.set_ylabel('Wind Speed [m/s]')
+ax2b.set_ylabel('Wind Direction')
+
+# Water temperature
+ax3.plot(df['time'], df['water_temperature'], color='tab:brown')
+ax3.set_ylabel('Water Temperature [degC]')
+
+plt.show()

examples/ndbc/buoy_type_request.py

@@ -0,0 +1,23 @@
+# Copyright (c) 2018 Siphon Contributors.
+# Distributed under the terms of the BSD 3-Clause License.
+# SPDX-License-Identifier: BSD-3-Clause
+"""
+NDBC Buoy Data Request (of any type)
+====================================
+
+The NDBC keeps a 40-day recent rolling file for each buoy. This examples shows how to access
+the other types of data available for a buoy.
+"""
+
+from siphon.simplewebservice.ndbc import NDBC
+
+####################################################
+# Request the types of data available from a given buoy.
+data_aval = NDBC.buoy_data_types('41002')
+print(data_aval)
+
+####################################################
+# Get a pandas data frame of all of the observations, meteorological data is the default
+# observation set to query.
+df = NDBC.realtime_observations('41002', data_type='supl')
+df.head()

examples/ndbc/latest_request.py

@@ -0,0 +1,42 @@
+# Copyright (c) 2018 Siphon Contributors.
+# Distributed under the terms of the BSD 3-Clause License.
+# SPDX-License-Identifier: BSD-3-Clause
+"""
+NDBC Latest Data Request
+========================
+
+This example shows how to use siphon's `simplewebswervice` support query the most recent
+observations from all of the NDBC buoys at once.
+"""
+
+import cartopy.crs as ccrs
+import cartopy.feature as cfeature
+import matplotlib.pyplot as plt
+
+from siphon.simplewebservice.ndbc import NDBC
+
+####################################################
+# Get a pandas data frame of all of the observations
+df = NDBC.latest_observations()
+df.head()
+
+####################################################
+# In this case I'm going to drop buoys that do not have water temperature measurements.
+df.dropna(subset=['water_temperature'], inplace=True)
+
+####################################################
+# Let's make a simple plot of the buoy positions and color by water temperature
+proj = ccrs.LambertConformal(central_latitude=45., central_longitude=-100.,
+                             standard_parallels=[30, 60])
+
+fig = plt.figure(figsize=(17., 11.))
+ax = plt.axes(projection=proj)
+ax.coastlines('50m', edgecolor='black')
+ax.add_feature(cfeature.OCEAN.with_scale('50m'))
+ax.add_feature(cfeature.LAND.with_scale('50m'))
+ax.set_extent([-85, -75, 25, 30], ccrs.PlateCarree())
+
+ax.scatter(df['longitude'], df['latitude'], c=df['water_temperature'],
+           transform=ccrs.PlateCarree())
+
+plt.show()