Smartphones could provide weather data in poor nations.

Smartphones can now be used to collect weatherdata such as air temperatures through WeatherSignal, a crowdsourcing app developed by UK start-up OpenSignal.

This helps crowdsource real-time weather forecasts and could one day help collect climate data in areas without weather stations, its developers say.


Once installed, the app automatically collects data and periodically uploads them to a server.

The app’s ability to record air temperature is based upon the discovery that the temperature of a smartphone battery correlates closely to the surrounding air temperature, published in Geophysical Research Letters this month (13 August).

Lithium ion batteries have temperature sensors to prevent damage caused by attempts to charge them when the battery is too hot,” the paper says.

But these sensors do not provide a direct air temperature measurement — due to heat being emitted by both the smartphone and its user. So the researchers used a model that estimates the outside temperature based on smartphone readings.

The fact that battery temperature correlates with ambient air temperature was discovered by accident, James Robinson, one of the authors of the paper and co-founder of OpenSignal, tells SciDev.Net.

“When data from many phones are joined together, they become even more powerful and will allow us to make weather predictions of unprecedented detail.”

James Robinson

The team was researching energy consumption in relation to poor mobile network signal, a condition that is known to reduce battery performance.

“We started playing with the data and decided to look at average battery temperature versus historic weather temperature, and we found a really strong correlation,” says Robinson.

The data came from eight major cities around the world covering a wide range of climate zones, and including Buenos Aires, Mexico City and São Paulo.

“Many smartphones have a variety of sensors,” says Robinson. “When data from many phones are joined together, they become even more powerful and will allow us to make weather predictions of unprecedented detail.

Developing countries often invest fewer resources in collecting weather data.

“As smartphones become more popular in developing countries, WeatherSignal could provide a valuable source of weather data — either supplementing existing sources or as the only source for some places,” he says.

“We’re open to working with as many people as possible,” Robinson says. “For instance, we plan on making historic data available to academics and organisations such as the World Meteorological Organization.”

Enzo Campetella, an Argentina-based meteorologist and WeatherSignal user, tells SciDev.Net that although the app has potential, “there are still several stages to accomplish” before it is completely reliable for use in meteorology.

“In meteorology, it is essential that data are comparable, so it is essential that they are collected following the same rules or standards,” he says.

And, in countries where weather stations are scarce, “the possibility of comparing data is much lower”, he explains.

The WeatherSignal team admit that “many additional high-quality urban observations [are] needed to refine the air temperature estimates from smartphones and to expand their possibilities”.

Having more data is also crucial, so they are also working to get as many people as possible using the app.


Chicago’s new role: hub of the digital heartland.

In the thick of the industrial revolution, the city of Chicago rose as the heart and hub of production, trading and transportation, thanks to its centralized location on the North American continent. The railroads all converged there, shipping goods from East Coast ports and factories to points west.

When the St. Lawrence Seaway opened — connecting Great Lakes shipping with trans-Atlantic shipping — Chicago also became the gateway for shipping to the middle of the continent. And, again because of it’s centrality, Chicago’s O’Hare International Airport grew to become the one of the world’s busiest airports. And with the interstate highway system, the city is also a trucking hub.

Now, it is reported, Chicago’s place in the middle of the continent is turning the city into the hub of the information age. As Crain’s Chicago Business‘ John Pletz reports, in an economy where online latency can cost a lot of money, the city is ideally situated:

“Chicago is one of the half-dozen key vertebrae in the nation’s digital backbone because it lies at the center of many of the fiber optic cables that stretch between New York and California, the country’s major connection points to the rest of the world via cables under the oceans. Chicago has the third-biggest fiber optic capacity of any metro area in the country, behind New York and Washington. And three of the world’s largest data centers are in Chicago or its suburbs.”

The challenge is that the city’s fiber-optic broadband network — laid in the late 1990s and early 2000s — in now stretched to it’s limit, Pletz writes. Greater coordination between regional governments and expanding more capabilities beyond the city’s central “Loop” area.

The Chicago region’s broadband network is an attraction to companies establishing data centers that need instantaneous connections and communications with the rest of the world. For example, Pletz cites the CME Group Inc., which operates the Chicago futures and commodities exchange. Transactions are delivered and sent across the globe in about 79 milliseconds. More than 200 telecom carriers, a number of internet service providers, and many of the world’s major financial exchanges rely on a data center housed within a former printing plant in the city.

Source: smart planet