Class: Barometer::WebService::NoaaStation

Inherits:
WebService
  • Object
show all
Defined in:
lib/barometer/web_services/noaa_station_id.rb

Overview

Web Service: NOAA Station ID

uses noaa to find the closest station id

Class Method Summary collapse

Class Method Details

._fetch_via_noaa(latitude, longitude) ⇒ Object

http://forecast.weather.gov/MapClick.php?textField1=LATITUDE&textField2=LONGITUDE



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# File 'lib/barometer/web_services/noaa_station_id.rb', line 26

def self._fetch_via_noaa(latitude, longitude)
  response = self.get(
    "http://forecast.weather.gov/MapClick.php?",
    :query => { :textField1 => latitude, :textField2 => longitude },
    :format => :html,
    :timeout => Barometer.timeout
  )

  # parse the station id from the given page
  station_id = nil

  begin
    doc = Nokogiri::HTML.parse(response.body)
    if doc && links = doc.search(".current-conditions-extra a")
      sid_link = links.detect{|link| link.attr("href").match(/sid=(.*)&/)}
      begin
        station_id = sid_link.attr("href").match(/sid=(.*?)&/)[1]
      rescue
      end
    end
  rescue
    puts "[ERROR] finding NOAA station near #{latitude}, #{longitude}" if Barometer::debug?
  end
  station_id
end

.fetch(latitude, longitude) ⇒ Object

get the closest station id for given coordinates



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# File 'lib/barometer/web_services/noaa_station_id.rb', line 11

def self.fetch(latitude, longitude)

  begin
    require 'nokogiri'
  rescue LoadError
    puts "\n****\nTo use this functionality you will need to install Nokogiri >= 1.3.3\n****\n\n"
    return nil
  end

  puts "fetching NOAA station ID near #{latitude}, #{longitude}" if Barometer::debug?
  return nil unless latitude && longitude
  _fetch_via_noaa(latitude, longitude)
end