blocks|key|872988|text|在火狐浏览器中，打开一个新标签，输入地址about:config。跳过警告消息并在过滤器框中键入geo.wifi.uri，您现在看到的是Firefox用于确定您的位置的web服务。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|872989|entityMap^0|K|C|1C|C|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]|$9|K|A|L|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|M|8|@]|D|@]|E|$]]]|G|$]]

In Firefox open a new tab and type in the address <code>about:config</code>. Go past the warning message and type <code>geo.wifi.uri</code> into the filter box, you are now looking at the web service Firefox uses for determining your location.

blocks|key|1087759|text|无论如何，API规范本身对地理位置实现是不可知的。因此，虽然Mozilla+Firefox和Google+Chrome都依赖于通过Google的位置服务数据库实现的网络地理定位，但这并不是标准的要求。例如，iPhone上的Mobile+Safari在某些情况下将使用全球定位系统，而不是WiFi三角测量或蜂窝站点地理定位，这取决于在给定时刻最准确和可访问的位置服务。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1087760|我们希望未来的浏览器能提供一些位置提供商的选择。我同意，如果浏览器支持不需要向第三方发送GPS+it列表的地理定位技术，对用户隐私和功能将是有好处的；我怀疑，随着WiFi传感器更多地集成到智能手机和笔记本电脑中，我们将看到允许您使用W3C地理定位API的浏览器。如果能为台式机提供一个可以在浏览器设置中手动指定位置的功能，也会更好，这也将与当前规范兼容。|1087761|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|F|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|G|8|@]|9|@]|A|$]]|$1|D|3|-4|5|6|7|H|8|@]|9|@]|A|$]]]|E|$]]

For what it's worth, the API specification itself is agnostic to the geolocation implementation. So while it's true that Mozilla Firefox and Google Chrome both rely on network-enabled geolocation via Google's Location Service database, that's not a requirement of the standard. For example, Mobile Safari on your iPhone will in some cases use GPS rather than WiFi-triangulation or cell-site geolocation, depending on what location service is most accurate and accessible at a given moment.

And we can hope that future browsers will provide some choice of the location provider. I agree that it would be good for user privacy and functionality if browsers supported geolocation technologies that didn't require sending a list of WiFi IDs to a third party; I suspect that as GPS sensors are more often integrated into smartphones and laptops, we'll see browsers that let you use GPS sensing for the W3C Geolocation API. It might also be nice to have a feature for desktop computers where the location can be manually specified in browser settings, this would also be compatible with the current spec.

blocks|key|873126|text|我对update4最后一个问题的猜测是，他们可能会根据你使用的设备不时地更新你的位置。例如，如果您只使用您的PC访问网络，而附近没有已知的wifi网络，那么您的位置将由IP地址确定，但是有关您的网络的信息将被收集，稍后假设您将iPhone或任何其他带有GPS的设备连接到您的同一wifi网络，并在其上使用GPS，谷歌会将这些GPS坐标与您的wifi+SSID或IP地址进行匹配。因此，在此之后，每当你的PC上的浏览器发送地理定位请求时，它都会检查IP和SSID是否匹配(可能还有一堆其他东西，比如附近的SSID等等)，如果它们匹配，它将返回先前由配备GPS的设备确定的位置。当然，这只是一种猜测，但也可能是这样的..此外，即使你从未将任何配备GPS的设备连接到你的网络，但它仍然可以准确地确定它，这可能是因为附近的wifi网络，这是谷歌已经知道的。毫无疑问，这是他们做的一项了不起的工作:)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|873127|更新：|873128|Firefox|offset|length|873129|Google+Chrome|873130|entityMap|0|LINK|mutability|MUTABLE|url|http://www.mozilla.org/en/firefox/geolocation/|1|http://support.google.com/chrome/bin/answer.py?hl=en&answer=142065^0|0|0|0|7|0|0|0|D|1|0^^$0|@$1|2|3|4|5|6|7|T|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|U|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|V|8|@]|9|@$F|W|G|X|1|Y]]|A|$]]|$1|H|3|I|5|6|7|Z|8|@]|9|@$F|10|G|11|1|12]]|A|$]]|$1|J|3|-4|5|6|7|13|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q]]|R|$5|M|N|O|A|$P|S]]]]

My guess to the last question in update4 is that supposedly they are updating your location from time to time, based on what device you use. For example if you used only your PC to access the web, and there is no known wifi networks nearby then your location will be determined by IP address, however information about your network will be gathered, later say you connect iPhone or any other device with GPS to your same wifi network, and use GPS on it, google will match those GPS coordinates to your wifi SSID or IP address. So, after then whenever your browser on PC sends a request for geolocation, it will check if the IP and SSID match (and maybe bunch of other things too, like SSID's in neighborhood and so on), and if they match, it will return the location that was previously determined by your GPS equipped device. This is just a guess of course, but it could be so.. also, even if you have never connected any GPS equipped device to your network, but it still determines it accurately, that might be because of the wifi networks in neighborhood, that are already known by google.. that's an awesome work they do, for sure :)

Update:
 
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="http://www.mozilla.org/en/firefox/geolocation/" rel="nofollow">Firefox</a>
 
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a href="http://support.google.com/chrome/bin/answer.py?hl=en&amp;answer=142065" rel="nofollow">Google Chrome</a>

Chrome and Firefox have HTML Geolocation implemented.

My question is: how does it work? Do they have a Database locally and get the information from the provider then try to match it?

Where is the DB stored ?
Can it be accessed ?

Update1: the only downside to geolocation is the browser has to ask the user for permission and this is really a bad thing for usability. I understand the security issue but still I don't see how this will become a popular solution.

Update2 : Firefox is using a Google WebService to detect the location. Now this seems very strange considering they are competitors now. Also this behavior it's really unexpected for me... I hopped each browser will have it's on (maybe offline) solution.

Update3 : So the browsers actually sniff for routers using your wireless network card?

Update4 : In the end what informations is the browser sending to the the google webservice ? The detected SSID seems ok ( and it makes sense that if they are tracked by google based on their physical position to make a lookup in the database for matching informations ) but how does it work so well in country where google didn't scanned this ? The other info your browser is sending is your ip but this is not enough to pin point your exact location right ? 

Regarding other browsers that might implement this. How should they do it ? The api is not documented only the old deprecated GEAR api gives some clue. So this is not really public.

How does HTML5 Geolocation Work?

数据库

路由器

路由

Chrome和Firefox都实现了HTML地理定位。我的问题是:它是如何工作的？他们是否在本地有一个数据库，并从提供商那里获取信息，然后尝试匹配它？数据库存储在哪里？它能被访问吗？Update1:地理定位唯一的缺点是浏览器必须请求用户的许可，这对可用性来说真的是一件坏事。我理解安全问题，但我仍然不认为这会成为一个流行...

问HTML5地理定位是如何工作的？
EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问HTML5地理定位是如何工作的？EN

社区

活动

资源

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问HTML5地理定位是如何工作的？
EN