Users download and run an Android app. Anytime you see a piece of interesting
infrastructure, net.tagger lets you "tag": it snaps a picture, makes a note of
the latitude/longitude, and uploads the result. The net.tagger site aggregates
all of these crowdsourced measurements to build a global map of network infrastructure.
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The physical network is critical infrastructure -- a cut cable can affect multiple
service providers or even disrupt service to an entire region. By understanding
the physical properties of communication networks, we can learn how to make them
The app requires certain sensor, file, and networking permissions, however net.tagger does not collect any data beyond user submissions and crash reports. At no time does net.tagger attempt to access personal files, change settings, or track users without their consent.