本文介绍了地理标记照片的概念及其应用，探讨了如何利用智能手机应用程序为照片添加地理信息，并概述了一种能够识别照片拍摄地点的技术系统。
geotagged images：地理标记照片，是指带有地理位置信息的照片，通常通过内置GPS的数码相机或智能手机拍摄得到。
①《谷歌智能照片识别系统能识别任何照片的拍摄地点》http://www.wtoutiao.com/p/2ff0oBr.html
从Flickr中选取了 230万张带有地理标记的照片看 PlaNet 能否对这些照片的拍摄地点进行准确识别（验证）。
②Geotagging、geotagged photograph 的 维基百科解释：
Geotagging (also written as GeoTagging) is the process of adding geographical identification metadata to various media such as a geotagged photograph or video, websites, SMS messages, QR Codes[1] or RSS feeds and is a form of geospatial metadata. This data usually consists of latitude and longitude coordinates, though they can also include altitude, bearing, distance, accuracy data, and place names, and perhaps a time stamp.
A geotagged photograph is a photograph which is associated with a geographical location by geotagging. Usually this is done by assigning at least a latitude and longitude to the image, and optionally altitude, compass bearing and other fields may also be included.
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