換K660i有一陣子了，前幾天無聊，看看手機上有一個google maps，就順手玩了一下
嘿，定位還蠻準的耶，我在哪裡就出現附近的地圖...
可是我用的系統商沒有跟google合作啊，這支手機也沒有AGPS...
那...Cell ID的位置是誰提供給Google的呢？
PS: K660i的Google maps是原生在手機裡的，不是我去抓下來的.....
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telecatw wrote:
基地台三點定位? 誤差200~800公尺...(恕刪)
一隻手機一次只能註冊到一個基地台的信號。
Google Maps沒有那麼厲害，可以用什麼三角定位法定位。
況且三角定位法要直線距離且需有時間訊號才可以定位。
Google Maps很簡單地只是取得一些公開的基地台位址資訊。
靠著你現在手機註冊的基地台的Cell ID得知你所在約略位置。
詳細見底下Google的官方回答，
http://maps.google.com/support/bin/answer.py?answer=81873
Mobile towers are placed by operators throughout an area to provide coverage for their users. Each of these towers has its own individual coverage area, usually split into three non-overlapping sections known as "cells." These cells come with identification numbers, but no location information. Google takes geo-contextual information [from anonymous GPS-readings, etc] and associates this information with the cell at that location to develop a database of cell locations. Based on this information, Google uses various algorithms to approximate your location relative to the cells nearest you. The accuracy of this information depends on how big an individual cell is. Thus, areas with a denser concentration of mobile towers allow for a more accurate My Location reading. Additionally, as our database of cell locations continues to improve, so too does the accuracy and coverage of the My Location feature.
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