IoT integrated into our daily lives. Smart cities are a great example of IoT integrated society. A smart city is an urban development vision that integrates Information and Communication Technology (ICT) and IoT technology within the city. Integrating IoT into cities results in

          Better security and public safety
          Smart transportation system
          Smart information and communication
          Building smart economy and finer system
          Providing better health and education.
          Environmental monitoring
          Water Safety
          Species protection

The definition of Smart City varies from city to city and country to country, depending on the level of development. So, basically smart cities is about an intelligent platform that includes technology within the society.
Juniper Research reveals the top 10 smart cities
The Smart City Vision 2017
Rank    City Country

1          Singapore        Singapore
2          London UK
3          New York         US
4          San Francisco  US
5          Chicago           US
6          Seoul   South Korea
7          Berlin  Germany
8          Tokyo   Japan
9          Barcelona        Spain
10        Melbourne      Australia
Let’s see some examples from these cities and how these cities are using IoT technology to be smart.

Singapore’s Smart Nation Vision:

Singapore took the smart city initiative in 2014 by establishing Smart Nation Vision. It focuses on five domains:
          Transportation
          Home
          Environment
          Business productivity
          Health
          Public sector services.


Singapore developed a software called Virtual Singapore, where a dynamic 3D model that enables city planners to run virtual tests for different projects. The Smart Nation Vision of Singapore included a large number of sensors and cameras, to be deployed across the island for tracking purposes. The city is very known  for the preparation of wireless communication at intervals the various sectors.

Singapore is a world leader when it comes to transportation networks. Singapore has implemented plans and investments in road sensors, smart traffic lights, and smart parking. It also has an open data platform related to data collected by sensors located on the island.
Here are some examples of the different applications for transportation side.
One Motoring is a portal for serving all drivers and vehicle owners in Singapore. Land Transport Authority (LTA) uses surveillance cameras to look out for road incidents, Speed Sign, Speed Sign, which is a smart electronic device that displays real time speed of vehicles. MyTransport.SG is a smartphone application provides real time information for commuters.

Barcelona’s Smart information management system:

Barcelona is using sensors extensively to monitor and manage traffic. The Barcelona’s government has installed smart parking technology, smart street lights and sensors for monitoring air quality and noise, and to provide smart transportation system, and also providing a network of free Wi-Fi in public spaces.

Barcelona’s developed a transport System application called Transports Metropolitans de Barcelona (TMB) ,which is an application to help the travelers to make one transfer between any two points in Barcelona. 95% of journeys in Barcelona uses this application.
And also Barcelona’s bus stops uses solar panel to activate screen that shows arrival time and a seat for waiting travelers.

Some of the other examples of apps used in Barcelona are
CityOS, which is a municipal smart information management system. This operating system is designed to collect and analyze data that's collected across the network of various sensors within the city.

Apps4Bcn, a collection of apps for everyday life in Barcelona.
Barcelona contactless, a contactless technology that provides real time local information to users. Barcelona is also known for its environmental sustainable projects. Sustainable energy, smart grid, pilot projects, and smart meters, in which IoT projects are applied.
San Francisco’s smart city technology:

San Francisco is one in every of the primary cities in North America to adopt good town technology. The city has several good comes like public transportation network, sustainability and smart urban development initiatives. It also has one of the highest densities of LEED-certified buildings in the United States. The city has been a frontrunner in terms of good parking. The San Francisco Park Initiative that was launched in 2011, wherever an oversized range of sensors square measure wont to monitor parking areas.

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