Fetching the latest weather

Now that you have a Weather Station to look at, you can learn how to fetch the last weather recording from that station.
This is again handled using the RESTful API of the Weather Station database. This time, the URL you need is made up of two parts. The first tells the database that you’re requesting the latest measurements:

https://apex.oracle.com/pls/apex/raspberrypi/weatherstation/getlatestmeasurements/

You need to add the ID of the Weather Station you wish to access to the end of this. For example:

https://apex.oracle.com/pls/apex/raspberrypi/weatherstation/getlatestmeasurements/1648902

  • Enter the URL of the webstation you would like to see the data from into your web browser.

  • Create a new Python file again, by clicking on File > New File.

  • Save your program as fetch_weather.py.

  • Once again, you’ll need the requests and json modules, as well as pprint:

    from requests import get
import json
from pprint import pprint

  • Now you can define a new url variable, but using the Weather Station ID you’ve chosen:

    url = 'https://apex.oracle.com/pls/apex/raspberrypi/weatherstation/getlatestmeasurements/weather_stn_id_goes_here'

  • To get the latest measurements you need one line of code, but we’ll add a second line to pretty-print it straight away:

    weather = get(url).json()['items']
pprint(weather)

  • Run your program

You should see data from the weather station you picked appear in the shell:

[{'air_pressure': 1008.81,
'air_quality': 74.9,
'ambient_temp': 23.58,
'created_by': 'ACRG_ROOF',
'created_on': '2016-11-16T12:00:01Z',
'ground_temp': 18.69,
'humidity': 33.41,
'id': 1669238,
'rainfall': 0,
'reading_timestamp': '2016-11-16T12:00:01Z',
'updated_by': 'ACRG_ROOF',
'updated_on': '2016-11-16T12:05:02.437Z',
'weather_stn_id': 1648902,
'wind_direction': 315,
'wind_gust_speed': 0,
'wind_speed': 0}]
  • If you don’t see any data, it might be because the Weather Station is offline. Just try another Weather Station Id.
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