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pacx.rb
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pacx.rb
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require 'json'
require 'net/http'
require 'date'
require 'time'
require 'awesome_print'
BOTS = %w(Benjamin PapaMau FontaineMaru PiccardMaru)
# find position of a glider
def glider_position(glider)
# query position for the past 24 hrs, grab latest position
time_start = (DateTime.now.to_time.utc-(60*60*24)).strftime("%Y-%m-%dT%H:%M:%SZ")
data = fetch_data("basic#{glider}",">=#{time_start}")
position = {:lat => data['table']['rows'][1][0], :long => data['table']['rows'][1][1], :time => data['table']['rows'][1][2]}
return position
end
def find_ships
# latest observation of AIS data for the past 48 hrs
time_start = (DateTime.now.to_time.utc-(60*60*48)).strftime("%Y-%m-%dT%H:%M:%SZ")
data = fetch_data("ship",">=#{time_start}")['table']['rows']
ships = {}
data.each do |row|
mmsi_id = row[4]
ships[mmsi_id] = {:lat => row[0], :long => row[1], :time => row[2]} unless mmsi_id == "0"
end
return ships
end
def fetch_data(dataset,time)
base_url = "http://data.liquidr.com/erddap/tabledap"
url = "#{base_url}/#{dataset}.json?&time#{time}"
resp = Net::HTTP.get_response(URI.parse(URI.encode(url)))
data = resp.body
result = JSON.parse(data)
if result.has_key? 'Error'
raise "API error"
end
return result
end
def build_triples(dataset, time)
collection = Array.new
pacx = fetch_data(dataset,time)
columns = pacx['table']['columnNames']
raise "time column is wrong" if columns[2] != 'time'
pacx['table']['rows'].each_with_index do |record,index|
triples = Array.new
columns.each_with_index do |column, i|
triples << { :time => DateTime.parse(record[2]), :metric => "#{dataset}.#{column}", :value => record[i] }
end
collection << triples
end
return collection
end