![]() Manual geotagging also introduces possibilities of error, where a photograph's location is incorrectly represented by wrong coordinates. Geocoding and reverse geocoding can be used to convert between locations and addresses. ![]() Some tools allow entry of tags such as city, postal code or a street address. The information can be entered by directly giving the coordinates or by selecting a location from a map using software tools. Location information can also be added to photos, for example via its Exif specification that has fields for longitude/latitude, even if no GPS device was present when the photo was taken. The resulting coordinates can then be added to the Exif information of the photo. Timestamps made by the camera can be compared with timestamps in the recorded GPS information, provided that the clocks in the separate devices can be synchronized. The photo is taken without geographical information and is processed later using software in conjunction with the GPS data. Most cameras sold today do not contain a built-in GPS receiver however, an external location-aware device, such as a hand-held GPS logger, can still be used with a non-GPS digital camera for geotagging. Automatic geotagging combined with real-time transfer and publishing results in real-time tagging. Many GPS-ready cameras are currently available, made by manufacturers such as Nikon, Fujifilm, Sony and Panasonic. A connected GPS will generally remain switched on continuously, requiring power, and will then have location information available immediately when the camera is switched on. Generally the relevant GPS data is automatically stored in the photo's Exif information when the photo is taken. The Samsung SH100 can connect using Wi-Fi to get position data from a GPS-enabled smartphone. Some digital cameras and camera phones support an external GPS receiver connected by cable, or inserted into the memory card slot or flash shoe. ![]() Canon uses the USB socket on the wireless file transmitter unit (WFT) as the GPS interface. Since 2009 Nikon has sold its own Geotagger GP-1. In 2006 the first special GPS receiver for Nikon was produced by Dawntech. The D1X and D1H that Nikon introduced in 2002 included a GPS interface. Geotagger "Solmeta N2 Compass" + Nikon D5000
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