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# Encoding: utf-8 | |
# IN GEMFILE : gem 'wombat' #does the scraping magic | |
class WeatherData < ActiveRecord::Base | |
require 'open-uri' | |
require 'digest/md5' | |
attr_accessible :max_wind, :mean_wind, :sea_level_pressure, :station_code, :station_id, :temp, :time_stamp, :wind_direction, :conditions | |
belongs_to :station | |
def self.new_from_metar(station_code) | |
begin | |
metar_station = Metar::Station.find_by_cccc(station_code) | |
parser = metar_station.parser | |
station = Station.find_or_create_by_title(:title => metar_station.name, :latitude => metar_station.latitude, :longitude => metar_station.longitude, :code => parser.station_code) | |
data = station.weather_datas.where(:time_stamp => parser.time).first_or_create :sea_level_pressure => parser.sea_level_pressure.to_f * 1000, | |
:station_id => station.id, | |
:conditions => parser.present_weather, | |
:mean_wind => parser.wind.to_s.split('k')[0].to_i, | |
:wind_direction => WeatherData.convert_to_degrees(parser.wind) | |
rescue Exception => msg | |
logger.error msg | |
end | |
end | |
def self.north_south_pressure_difference(limit = 1) | |
lszh = Station.where(:code => "LSZH").first | |
lsza = Station.where(:code => "LSZA").first | |
lszh.weather_datas.order("time_stamp DESC").limit(limit).map { |zrh| {:pressure_gradient => (lsza.weather_datas.where(:time_stamp => zrh.time_stamp).first ? lsza.weather_datas.where(:time_stamp => zrh.time_stamp).first.sea_level_pressure - zrh.sea_level_pressure : nil), :time => zrh.time_stamp} } | |
end | |
def self.refresh_data | |
WeatherData.new_from_metar("LSZA") | |
WeatherData.new_from_metar("LSZH") | |
WeatherData.import_new_from_balise_db | |
WeatherData.new_from_scraper | |
end | |
def self.new_from_chalais | |
results = open "http://chalais.atelier-agile.ch/winds/current.json" | |
chalais = JSON.parse(results.read) | |
station = Station.find_or_create_by_title(:title => 'Chalais') | |
data = station.weather_datas.where(:time_stamp => chalais[3]).first_or_create :mean_wind => chalais[0], | |
:max_wind => chalais[1], | |
:wind_direction => chalais[2] | |
end | |
def self.conditions_for(title, limit = 1) | |
station = Station.where(:title => title).first | |
station.weather_datas.order("time_stamp DESC").limit(limit) | |
end | |
def self.import_new_from_balise_db | |
station = Station.find_or_create_by_title(:title => 'Chalais') | |
# BaliseData.where(["time > ?", (Time.now - 1.month)]).find_each do |data| | |
BaliseData.where(["time > ?", WeatherData.order("time_stamp DESC").limit(1).first.time_stamp]).find_each do |data| | |
case data.sensor_id | |
when 2 | |
new_measure = station.weather_datas.where(:time_stamp => data.time).first_or_create | |
new_measure.update_attribute(:mean_wind, data.value) | |
when 3 | |
new_measure = station.weather_datas.where(:time_stamp => data.time).first_or_create | |
new_measure.update_attribute(:max_wind, data.value) | |
when 1 | |
new_measure = station.weather_datas.where(:time_stamp => data.time).first_or_create | |
new_measure.update_attribute(:wind_direction, data.value) | |
when 4 | |
new_measure = station.weather_datas.where(:time_stamp => data.time).first_or_create | |
new_measure.update_attribute(:temp, data.value) | |
end | |
end | |
end | |
def self.new_from_scraper | |
sample = scraped_weather_data | |
set_data_for("Sion", "sion", sample) | |
set_data_for("Visp", "visp", sample) | |
set_data_for("Montana", "montana", sample) | |
set_data_for("Gütsch", "guetsch", sample) | |
end | |
# def self.wind_for_visp | |
# url = "http://api.wetter.com/forecast/weather" | |
# search = "CH0CH4146" | |
# cs = Digest::MD5.hexdigest("#{PROJEKT}#{WETTER_API_KEY}#{search}") | |
# | |
# results = open "#{url}/city/#{search}/project/#{PROJEKT}/cs/#{cs}/output/json" | |
# results.read | |
# end | |
def cardinal_points | |
case wind_direction.to_i | |
when 0..(45-22) | |
"Nord" | |
when (45-22)..(90-22) | |
"Nord-Est" | |
when (90-22)..(135-22) | |
"Est" | |
when (135-22)..(180-22) | |
"Sud-Est" | |
when (180-22)..(225-22) | |
"Sud" | |
when (225-22)..(270-22) | |
"Sud-Ouest" | |
when (270-22)..(315-22) | |
"Ouest" | |
when (315-22)..(360-22) | |
"Nord-Ouest" | |
when (360-22)..360 | |
"Nord" | |
else "Variable" | |
end | |
end | |
def self.convert_to_degrees(metar_wind) | |
direction_string = metar_wind.to_s.split(" ").last | |
case direction_string | |
when "N" | |
0 | |
when "E" | |
90 | |
when "S" | |
180 | |
when "W" | |
270 | |
when "WSW" | |
247.50 | |
when "NNE" | |
22.50 | |
else | |
-1 | |
end | |
end | |
def self.scraped_weather_data | |
Wombat.crawl do | |
base_url "http://www.meteoschweiz.admin.ch" | |
path "/web/de/wetter/aktuelles_wetter.par0010.html?allStations=1" | |
measure_date css: "p.text" | |
visp css: "#karte_data_aktueller_wind_numerisch___VIS" | |
sion css: "#karte_data_aktueller_wind_numerisch___SIO" | |
montana css: "#karte_data_aktueller_wind_numerisch___MVE" | |
guetsch css: "#karte_data_aktueller_wind_numerisch___GUE" | |
end | |
end | |
def self.set_data_for(title, key, sample) | |
date = sample["measure_date"] | |
day = date.split(" ")[2] | |
time = date.split(" ")[3] | |
time_stamp = Time.parse("#{day} #{time.gsub(".", ":")}") | |
station = Station.find_or_create_by_title(:title => title) | |
new_measure = station.weather_datas.where(:time_stamp => time_stamp).first_or_create | |
new_measure.update_attributes :max_wind => sample[key].split("|")[2].to_i, | |
:mean_wind => sample[key].split("|")[1].to_i, | |
:wind_direction => sample[key].split("|")[0].to_i | |
end | |
def time_stamp_corrected | |
if self.station_id == 5 | |
time_stamp - 2.hours | |
else | |
time_stamp | |
end | |
end | |
end |
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