IPアドレスから、緯度、経度を取得するスクリプト

ip_to_lat_lon.rb

#!/usr/bin/env ruby

require 'rubygems'
require 'geoip'
require 'optparse'
require 'pp'

GEOIP_REGION_TO_JAPAN_PREFECTURE = {
  JP01: 23, JP02:  5, JP03:  2, JP04: 12, JP05: 38, JP06: 18,
  JP07: 40, JP08:  7, JP09: 21, JP10: 10, JP11: 34, JP12:  1,
  JP13: 28, JP14:  8, JP15: 17, JP16:  3, JP17: 37, JP18: 46,
  JP19: 14, JP20: 39, JP21: 43, JP22: 26, JP23: 24, JP24:  4,
  JP25: 45, JP26: 20, JP27: 42, JP28: 29, JP29: 15, JP30: 44,
  JP31: 33, JP32: 27, JP33: 41, JP34: 11, JP35: 25, JP36: 32,
  JP37: 22, JP38:  9, JP39: 36, JP40: 13, JP41: 31, JP42: 16,
  JP43: 30, JP44:  6, JP45: 35, JP46: 19, JP47: 47,
}

PREFECTURES = {
   1 => '北海道',  2 => '青森県',  3 => '岩手県',  4 => '宮城県',  5 => '秋田県',  6 => '山形県',
   7 => '福島県',  8 => '茨城県',  9 => '栃木県', 10 => '群馬県', 11 => '埼玉県', 12 => '千葉県',
  13 => '東京都', 14 => '神奈川県', 15 => '新潟県', 16 => '富山県', 17 => '石川県', 18 => '福井県',
  19 => '山梨県', 20 => '長野県', 21 => '岐阜県', 22 => '静岡県', 23 => '愛知県', 24 => '三重県',
  25 => '滋賀県', 26 => '京都府', 27 => '大阪府', 28 => '兵庫県', 29 => '奈良県', 30 => '和歌山県',
  31 => '鳥取県', 32 => '島根県', 33 => '岡山県', 34 => '広島県', 35 => '山口県', 36 => '徳島県',
  37 => '香川県', 38 => '愛媛県', 39 => '高知県', 40 => '福岡県', 41 => '佐賀県', 42 => '長崎県',
  43 => '熊本県', 44 => '大分県', 45 => '宮崎県', 46 => '鹿児島県', 47 => '沖縄県',
}

PREFECTURES_LON_LAT = {
  1 =>	[[141,20,49],[43,3,51]],
  2 =>	[[140,44,24],[40,49,28]],
  3 =>	[[141,9,9],[39,42,13]],
  4 =>	[[140,52,19],[38,16,8]],
  5 =>	[[140,6,9],[39,43,7]],
  6 =>	[[140,21,48],[38,14,26]],
  7 =>	[[140,28,4],[37,45,0]],
  8 =>	[[140,26,48],[36,20,29]],
  9 =>	[[139,53,1],[36,33,57]],
  10 =>	[[139,03,39],[36,23,28]],
  11 =>	[[139,38,56],[35,51,25]],
  12 =>	[[140,7,24],[35,36,17]],
  13 =>	[[139,41,30],[35,41,22]],
  14 =>	[[139,38,33],[35,26,52]],
  15 =>	[[139,1,25],[37,54,8]],
  16 =>	[[137,12,41],[36,41,43]],
  17 =>	[[136,37,32],[36,35,40]],
  18 =>	[[136,13,19],[36,3,55]],
  19 =>	[[138,34,6],[35,39,50]],
  20 =>	[[138,10,52],[36,39,5]],
  21 =>	[[136,43,20],[35,23,28]],
  22 =>	[[138,22,59],[34,58,37]],
  23 =>	[[136,54,24],[35,10,49]],
  24 =>	[[136,30,31],[34,43,49]],
  25 =>	[[135,52,6],[35,0,16]],
  26 =>	[[135,45,20],[35,1,17]],
  27 =>	[[135,31,12],[34,41,11]],
  28 =>	[[135,10,59],[34,41,29]],
  29 =>	[[135,49,58],[34,41,7]],
  30 =>	[[135,10,3],[34,13,34]],
  31 =>	[[134,14,18],[35,30,13]],
  32 =>	[[133,3,2],[35,28,20]],
  33 =>	[[133,56,6],[34,39,42]],
  34 =>	[[132,27,34],[34,23,47]],
  35 =>	[[131,28,17],[34,11,9]],
  36 =>	[[134,33,34],[34,3,57]],
  37 =>	[[134,2,36],[34,20,25]],
  38 =>	[[132,45,58],[33,50,30]],
  39 =>	[[133,31,52],[33,33,35]],
  40 =>	[[130,25,5],[33,36,23]],
  41 =>	[[130,17,56],[33,14,58]],
  42 =>	[[129,52,25],[32,44,41]],
  43 =>	[[130,44,30],[32,47,23]],
  44 =>	[[131,36,45],[33,14,17]],
  45 =>	[[131,25,26],[31,54,40]],
  46 =>	[[130,33,29],[31,33,37]],
  47 =>	[[127,40,52],[26,12,45]]
}

def sexsig_to_decim arr
  a = arr[0].to_f + (arr[1].to_f / 60) + (arr[2].to_f / 3600)
  a.round(3)
end

options = {
  dat_path: './GeoLiteCity.dat'
}
OptionParser.new do |opt|
  opt.on('-f'){|v| options[:dat_path] = v }
end

unless File.exists? options[:dat_path]
  raise ArgumentError, "No such file: #{options[:dat_path]}"
end

ip_or_hostname = ARGV.shift

geoip = GeoIP.new(options[:dat_path]).city(ip_or_hostname)
key = geoip.country_code2 + geoip.region_name

if prefecture_code = GEOIP_REGION_TO_JAPAN_PREFECTURE[key.to_sym]
  lon = sexsig_to_decim(PREFECTURES_LON_LAT[prefecture_code][0])
  lat = sexsig_to_decim(PREFECTURES_LON_LAT[prefecture_code][1])
  puts "#{ip_or_hostname} -> #{prefecture_code}:#{PREFECTURES[prefecture_code]} (#{lon}, #{lat})"
else
  puts "#{ip_or_hostname} -> UNKNOWN"
end