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Real-time geotagging is a name given to the automatic technique of acquiring media (such as photos, audio or video), associating a specific location with the media, transferring the media to an online map and publishing the media in real time. It is thus an extension of an automatic geotagging process, requiring an in-built or attached location acquisition device (such as GPS or Wi-Fi positioning system), but also requires communication with a wireless data transfer device (such as mobile phone networks or Wi-Fi networks). Several modern cell phones and digital cameras already integrate camera, aGPS, and wireless data transfer into one device, thus directly producing a geotagged photograph. Real-time geotagging is sometimes referred to as "mobile geotagging" or "autogeotagging", but this does not imply the real-time publishing step.
Geotagging is gaining popularity with photographers to produce geotagged photographs. A few cameras have built-in geolocation capability. Most, apart from smartphones, do not, so many photographers rely on external GPS receivers to determine location. Location may be inserted immediately into the picture file by tethering with Bluetooth or suitable wired connection, which are about as rare in cameras as the built-in autogeotagging feature.
GPS units, internal or external, require a lock from at least three satellites (for position), which usually requires up to 60 seconds. However, acquisition time is decreasing rapidly with hardware improvements. Some 21st-century GPS receivers use cell tower location and one global positioning satellite to obtain a faster lock on location. This technology known as assisted GPS (aGPS) is becoming more popular in cellular phones, since it leverages cell tower locations.
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