Altitude-based indoor or outdoor detection

Using estimates of a receiver's altitude to determine where a receiver (120) is located and to refine a positioning system's estimate of a receiver's position. Systems and methods determine whether areceiver (120) is inside or outside a building (190), and may use the determination to confirm or adjust an initial estimate of the receiver's position. Various approaches for making the determinationand for assessing the initial estimate of the receiver's position are described. 使用对接收器的海拔的估计来确定接收器(120)位于何处并且改进定位系统对接收器的位置的估计。系统和方法确定接收器在建筑物(120)内部还是外部，并且可以使用上述确定来确认或调整对接收器的位置的初始估计。描述了用于进行上述确定和用于评估对接收器的位置的初始估计的各种方法。