Comparing geocoders: Google vs Nominatim

geocoding.rb

require 'geocoder'

# (b-a)*prng.rand + a
def random(a,b)
  (b-a) * rand() + a
end

# -90 -> 90
def random_lat
  random(-90, 90)
end

# -180 -> 180
def random_lng
  random(-180, 180)
end

def locs
  @locs ||= 50.times.map {  { location: "#{random_lat}, #{random_lng}" } }
end

def lookup(service)
  locs.map! do |loc|
    sleep 1
    r = Geocoder.search(loc[:location]).first
    if r.nil?
      loc.merge "#{service}" => nil
    else
      loc.merge  "#{service}" => r.address
    end
  end
end

def print_results
  locs.each_with_index do |loc, i|
    next if loc['google'].nil? && loc['nominatim'].nil?
    puts "\n*** #{i} ***\ngoogle    : #{loc['google']}\nnominatim : #{loc['nominatim']}"
  end
end

puts "Looking up google"
Geocoder.configure(
  lookup: :google,
  timeout: 10
)
lookup('google')

puts "Looking up nominatim"
Geocoder.configure(
  lookup: :nominatim,
  timeout: 10
)
lookup('nominatim')

print_results

results.txt

*** 1 ***
google    : Antarctica
nominatim : 

*** 3 ***
google    : Indonesia
nominatim : South Sulawesi, Indonesia

*** 5 ***
google    : Panna Khajuraho Road, Panna National Park, Madhya Pradesh 488001
nominatim : Hinnauta, Panna, Madhya Pradesh, India

*** 7 ***
google    : Antarctica
nominatim : Antarctica

*** 8 ***
google    : Oymyakonsky District, Sakha, Russia
nominatim : Нелькан, Оймяконский улус, Sakha (Yakutia) Republic, Far Eastern Federal District, Russian Federation

*** 9 ***
google    : Antarctica
nominatim : 

*** 12 ***
google    : Antarctica
nominatim : 

*** 13 ***
google    : Antarctica
nominatim : 

*** 14 ***
google    : Antarctica
nominatim : 

*** 17 ***
google    : Antarctica
nominatim : 

*** 19 ***
google    : Antarctica
nominatim : 

*** 21 ***
google    : Antarctica
nominatim : Ross Dépendency (New Zealand Claim)

*** 24 ***
google    : Range Road 103, Youngstown, AB T0J 3P0, Canada
nominatim : Range Road  103, Alberta, Canada

*** 25 ***
google    : Olenekskiy Natsionalnyy ulus, Sakha, Russia
nominatim : Olenyoksky Ulus, Sakha (Yakutia) Republic, Far Eastern Federal District, Russian Federation

*** 26 ***
google    : DJ225, Romania
nominatim : DJ225, Mireasa, Constanța, 907279, Romania, European Union

*** 27 ***
google    : 
nominatim : Арзан

*** 30 ***
google    : Foot Trail, Gambell, AK 99742, USA
nominatim : Gambell, Nome, Alaska, United States of America

*** 33 ***
google    : Antarctica
nominatim : 

*** 35 ***
google    : Alto Amazonas, Peru
nominatim : Alto Amazonas, Department of Loreto, Peru

*** 37 ***
google    : 
nominatim : Hawaii, United States of America

*** 38 ***
google    : Antarctica
nominatim : Antarctica

*** 40 ***
google    : Antarctica
nominatim : 

*** 41 ***
google    : Antarctica
nominatim : 

*** 44 ***
google    : 
nominatim : South Sandwich Islands, South Georgia and the South Sandwich Islands

*** 46 ***
google    : ĐT723, Đạ Sar, Lạc Dương, Lam Dong, Vietnam
nominatim : 723, Dalat, Lam Dong province, Vietnam

*** 47 ***
google    : 
nominatim : Krasnoyarsk Krai, Siberian Federal District, Russian Federation

*** 49 ***
google    : 
nominatim : Luba, Bioko Sur, Región Insular, Equatorial Guinea