Class: WrfForecast::Threshold::TemperatureThreshold

Inherits:
BaseThreshold
  • Object
show all
Defined in:
lib/wrf_forecast/threshold/temperature_threshold.rb

Overview

This class determines the significant temperature thresholds for a forecast day. That means that this class can only work correctly if the data represents a time span of up to 24 hours. The indicators and thresholds are bases on the climate indicators of the german (weatherservice):

  • ice day: the temperature of the day did not exceed 0.0 degrees celsius

  • frost day: the temperature was below 0.0 degress celsius at least once

  • summer day: the temperature did exceed 25.0 degress celsius at least once

  • hot day: the temperature did exceed 30.0 degress celsius at least once

  • tropical night: the temperature of the day did not fall below 20.0 degrees celsius

Instance Attribute Summary

Attributes inherited from BaseThreshold

#indicators

Instance Method Summary collapse

Methods inherited from BaseThreshold

#add_indicator, #change_indicator, #check_data_values, #initialize

Constructor Details

This class inherits a constructor from WrfForecast::Threshold::BaseThreshold

Instance Method Details

#determine_indicators(data_values) ⇒ Object (private)

method to determine the indicators based on the input data

Parameters:

  • data_values (Array) —

    the input values



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# File 'lib/wrf_forecast/threshold/temperature_threshold.rb', line 31

def determine_indicators(data_values)
  data_values.each { |value|
    change_indicator(:ice_day, false, value > 273.15)
    change_indicator(:frost_day, true, value < 273.15)
    change_indicator(:summer_day, true, value > 298.15)
    change_indicator(:hot_day, true, value > 303.15)
    change_indicator(:tropical_night, false, value < 293.15)
  }
  nil
end

#initialize_indicators ⇒ Object (private)

initialization of the required indicators



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# File 'lib/wrf_forecast/threshold/temperature_threshold.rb', line 20

def initialize_indicators
  add_indicator(:ice_day, true, I18n.t("threshold.temperature.ice_day"))
  add_indicator(:frost_day, false, I18n.t("threshold.temperature.frost_day"))
  add_indicator(:summer_day, false, I18n.t("threshold.temperature.summer_day"))
  add_indicator(:hot_day, false, I18n.t("threshold.temperature.hot_day"))
  add_indicator(:tropical_night, true, I18n.t("threshold.temperature.tropical_night"))
  nil
end