Monitoring of volcanic activity is important for learning about the properties of each volcano and for providing early warning systems to the population. Monitoring equipment can be expensive, and thus the degree of monitoring varies from volcano to volcano and from country to country, with many volcanoes not being monitored at all. This paper describes the development of a wireless sensor network (WSN) capable of collecting geophysical measurements on remote active volcanoes. Our main goals were to create a flexible, easy-to-deploy and easy-to-maintain, adaptable, low-cost WSN for temporary or permanent monitoring of seismic tremor. The WSN enables the easy installation of a sensor array in an area of tens of thousands of m 2 , allowing the location of the magma movements causing the seismic tremor to be calculated. This WSN can be used by recording data locally for later analysis or by continuously transmitting it in real time to a remote laboratory for real-time analyses. We present a set of tests that validate different aspects of our WSN, including a deployment on a suspended bridge for measuring its vibration.
Tourism is a major social and cultural activity with relevant economic impact. In an effort to promote their attractions with tourists, some cities have adopted the open-data model, publishing touristic data for programmers to use in their own applications. Unfortunately, each city publishes touristic information in its own way. A common Application Programming Interface (API) for accessing this information would enable applications to seamlessly use data from several cities, increasing their potential market while reducing the development costs. This would help developers in making cross-city applications, lowering the overhead of supporting new cities and providing them with increased exposure. Finally, tourists will also benefit from better and cheaper applications due to the boosted competition. This paper provides an overview of the design, deployment and utilization of the CitySDK Tourism API, which aims to provide access to information about Points of Interest, Events and Itineraries. It was designed in order to be used by municipalities, regional or national governments as well as other public or private entities interested in publishing touristic information. The API comprehends a delegation model, allowing applications to access worldwide information by only knowing a single API endpoint. The API was created and validated in the context of the CitySDK project, through which a server reference implementation, client libraries and a set of demonstration applications have also been made available. The API is currently available for the cities of Amsterdam, Helsinki, Lamia, Lisbon and Rome. Several companies have developed mobile applications that use this API.
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