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Photography Geocoding: Difference between revisions
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The popularity of applications such as Google Earth and Google Maps and the possibility of posting georeferenced pictures lead to the need geocoding photographies. A geocoded photography has the location of the photographer embeded in the files. This information includes at least latitude and longitude but might include also altitude and the bearing of the camera<ref name="Geo_photo">[Wikipedia:Geotagged photograph|Geotagged photograph in Wikipedia]. | The popularity of applications such as Google Earth and Google Maps and the possibility of posting georeferenced pictures lead to the need geocoding photographies. A geocoded photography has the location of the photographer embeded in the files. This information includes at least latitude and longitude but might include also altitude and the bearing of the camera<ref name="Geo_photo">[Wikipedia:Geotagged photograph|Geotagged photograph in Wikipedia]</ref>. | ||
The most pratical way of geocoding photographies is by doing it automatically on the camera if the the camera has an embeded GNSS receiver or can be connected to an add-on GNSS receiver. GNSS-enabled [[Wikipedia:Mobile phone|mobile phones]] usually geotag photographies automatically<ref name="Geo_Safety">[http://www.nv.ngb.army.mil/Army%20Geotagging%20Safety.pdf Geotags and Location-Based Social Networking], US Army</ref>. | The most pratical way of geocoding photographies is by doing it automatically on the camera if the the camera has an embeded GNSS receiver or can be connected to an add-on GNSS receiver. GNSS-enabled [[Wikipedia:Mobile phone|mobile phones]] usually geotag photographies automatically<ref name="Geo_Safety">[http://www.nv.ngb.army.mil/Army%20Geotagging%20Safety.pdf Geotags and Location-Based Social Networking], US Army</ref>. | ||
Revision as of 02:12, 8 April 2011
| Applications | |
|---|---|
| Title | Photography Geocoding |
| Author(s) | Rui Barradas Pereira. |
| Level | Basic |
| Year of Publication | 2011 |
The popularity of applications such as Google Earth and Google Maps and the possibility of posting georeferenced pictures lead to the need geocoding photographies. A geocoded photography has the location of the photographer embeded in the files. This information includes at least latitude and longitude but might include also altitude and the bearing of the camera[1].
The most pratical way of geocoding photographies is by doing it automatically on the camera if the the camera has an embeded GNSS receiver or can be connected to an add-on GNSS receiver. GNSS-enabled mobile phones usually geotag photographies automatically[2].
Application Architecture
Photography geocoding depends normally on GNSS-enabled camera or mobile phone.
Geocoding can be done in the following ways[1]:
- Automatic with embeded GNSS receiver: The GNSS receiver is embeded in the camera and when a photo is taken the photo is tagged with the position information coming from the receiver.
- Automatic with connected GNSS receiver: The GNSS receiver is conected to the camera either by a wired or a bluetooth connection or and when a photo is taken the photo is tagged with the position information coming from the receiver.
- Synchronizing with GNSS logger: The photographer carries with him GNSS logger that logs the position at regular intervals and the photo is tagged offline by comparing the photo timestamp with the GNSS logger timestamps and position
- Manual Geocoding: The photo coordinates are determined offline with the help of a mapping software where the position is marked .
These applications are considered non-critical applications.
The precision required by these applications is low, being the current accuracy provided by civilian GPS is enough.
Privacy Issues
As with social networking, photo geocoding has privacy issues to be considered. GNSS-enabled mobile phones automaticaly geocode pictures by defaullt. Usually most users are not aware that location is being embeded in all photos taken[2].
Application Examples
Example of location-based social networks[3]:
- foursquare: Allows to check in on location, share information about the location and to know where your friends are.
- Gowalla: Allows to check in on location, share information about the location and to know where your friends are.
- Facebook: Facebook Places provides check in functionality in Facebook.
- Google Latitude: Google service that allows the user to share its location with selected users.
- Twitter: The Twitter API allows to add latitude and longitude information to every twit.
Notes