Chapter 17. Positioning: accelerometers and location
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When we first introduced the iPhone, we highlighted a number of its unique features. Among them were two components that allow the iPhone to figure out precisely where it is in space: a trio of accelerometers, which give it the ability to sense motion in three dimensions, and a locational device (using either GPS or faux GPS), which lets it figure out where in the world it is.
Other than accessing some basic orientation information, we haven’t done much with these features. That’s because most of the functionality isn’t available to the web interface, and because it lies beyond the basic concepts of the SDK ...
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