Module: KNMI

Defined in:
lib/knmi.rb,
lib/knmi/station.rb,
lib/knmi/parameters.rb,
lib/knmi/httpservice.rb,
lib/knmi/calculations.rb

Defined Under Namespace

Classes: Calculations, HttpService, Parameters, Station

Class Method Summary collapse

Class Method Details

.convert(parameters, request) ⇒ Hash

Input data request object and return array of hashes converted from storage to operable units.

Parameters:

    • Parameters object
    • Data object from HttpRequest

Returns:

    • Hash containing climate data in operable units


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# File 'lib/knmi.rb', line 122

def convert(parameters, request)
  
  if parameters[0].period == "daily"        
    KNMI::Calculations.convert_daily(request.data)
    
  elsif parameters[0].period == "hourly"
    KNMI::Calculations.convert_hourly(request.data)
    
  end    
end

.get_data(station, parameters, starts = nil, ends = nil, seasonal = false) ⇒ KNMI::HttpService

Retrieve climate data from a weather station

Parameters:

    • station object retrieved with KNMI.station_by_id() or KNMI.station_by_location()
    • parameters object retrieved with KNMI.parameters()
  • (defaults to: nil)
    • Time object e.g. Time.utc(2010, 6, 28)
  • (defaults to: nil)
    • Time object e.g. Time.utc(2010, 6, 29)
  • (defaults to: false)

Returns:



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# File 'lib/knmi.rb', line 105

def get_data(station, parameters, starts = nil, ends = nil, seasonal = false)
  
  if parameters[0].period == "daily"        
    HttpService.get_daily(station, parameters, starts, ends, seasonal)
    
  elsif parameters[0].period == "hourly"        
    HttpService.get_hourly(station, parameters, starts, ends, seasonal)
    
  end
end

.parameters(period, params = nil, categories = nil) ⇒ Array<KNMI::Parameters>

Get an array of parameter objects

All details in daily_data_key.yml and hourly_data_key.yml

Examples:

Get daily station data and a single parameter

KNMI.parameters("daily", "TX")

Get hourly station data and a multiple parameters

KNMI.parameters("hourly", ["TX", "TG"])

Get hourly station data and a multiple categories

KNMI.parameters("daily", nil, ["WIND", "TEMP"])

Parameters:

    • "daily" or "hourly"
  • (defaults to: nil)
    • array of parameters e.g ["TX", "TG"]
  • (defaults to: nil)
    • array of categories e.g. ["WIND", "TEMP"]

Returns:

    • array of KNMI::Parameters objects


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# File 'lib/knmi.rb', line 67

def parameters(period, params = nil, categories = nil)
  if params.nil? and categories.nil?
    
    list = Parameters.all(period)
  
  elsif categories.nil?
    
    # Parameters by name
    list = []
    params = unique_params(params, list) #ensure params are unique to list 
    list << Parameters.find(period, params)        
    list.flatten!
    list.compact!
  else 

    # Parameters by category
    list = []
    list << Parameters.category(period, categories)
    list.flatten!
    
    # Parameters by name
    params = unique_params(params, list) #ensure params are unique to list 
    list << Parameters.find(period, params)        
    list.flatten!
    list.compact!
  end
  return list
end

.station_by_id(station_id) ⇒ KNMI::Station

Get station object by station ID

Examples:

Get station by ID

KNMI.station_by_id(210)

Parameters:

    • number of station of interest, station_ids can be found in

Returns:

    • Object with details about the requested station


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# File 'lib/knmi.rb', line 46

def station_by_id(station_id)
  Station.find(station_id)
end

.station_by_location(lat, lng) ⇒ KNMI::Station

Get nearest station by lat lng

Examples:

Get nearest station by lat, lng

KNMI.station_by_location(52.165, 52.165)

Get nearest station by [lat, lng]

KNMI.station_by_location([52.165, 52.165])

Get nearest station with GeoKit object

KNMI.station_by_location(GeoKit::LatLng.new(52.165, 4.419))

Parameters:

    • latitude e.g. 52.165
    • longitude e.g. 52.165
    • [lat, lng] e.g. [52.165, 4,419] eqivalent to (lat, lng)

  • Geokit object e.g. GeoKit::LatLng.new(52.165, 4.419) eqivalent to (lat, lng)

Returns:

    • Object with details about the station nearest to the requested lat/lng


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# File 'lib/knmi.rb', line 34

def station_by_location(lat, lng)
  Station.closest_to(lat, lng)
end