Warnell School of Forestry and Natural Resources, University of Georgia, Athens, GA, United States of America.
PLoS One. 2019 Jul 18;14(7):e0219890. doi: 10.1371/journal.pone.0219890. eCollection 2019.
An iPhone 6 using the Avenza software for capturing horizontal positions was employed to understand relative positional accuracy in an urban environment, during two seasons of the year, two times of day, and two perceived WiFi usage periods. On average, time of year did not seem to influence the average error observed in horizontal positions when GPS-only (no WiFi) capability was enabled, nor when WiFi was enabled. Observations of average horizontal position error only seemed to improve with time of day (afternoon) during the leaf-off season. During each season and during each time of day, horizontal position error seemed to improve in general during perceived high WiFi usage periods (when more people were present). Overall average horizontal position accuracy of the iPhone 6 (7-13 m) is consistent with the general accuracy levels observed of recreation-grade GPS receivers in potential high multi-path environments.
使用 Avenza 软件捕获水平位置的 iPhone 6 被用于了解在城市环境中，在一年中的两个季节、一天中的两个时间和两个感知的 WiFi 使用时段，相对位置精度。平均而言，启用仅 GPS（无 WiFi）功能时，季节时间似乎不会影响水平位置的平均误差，启用 WiFi 时也不会。在落叶季节，仅在下午时段，观察到的平均水平位置误差似乎随着时间的推移而提高。在每个季节和每天的每个时间，在感知的高 WiFi 使用时段（当更多人在场时），水平位置误差似乎总体上有所改善。iPhone 6 的整体平均水平位置精度（7-13 米）与潜在高多径环境中娱乐级 GPS 接收器观察到的一般精度水平一致。
