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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 photos. A geocoded photo has the location of the photographer embedded 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 popularity of applications, such as Google Earth and Google Maps, and the possibility of posting georeferenced pictures lead to the need of geocoding photos. A geocoded photo has the location of the photographer embedded 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 practical way of geocoding photos is by doing it automatically on the camera if the camera has an embedded GNSS receiver or can be connected to an add-on GNSS receiver. GNSS-enabled [[Wikipedia:Mobile phone|mobile phones]] usually geotag photos 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 practical way of geocoding photos is by doing it automatically on the camera if the camera has an embedded GNSS receiver or can be connected to an add-on GNSS receiver. GNSS-enabled [[Wikipedia:Mobile phone|mobile phones]] usually geotag photos automatically<ref name="Geo_Safety">[http://www.nv.ngb.army.mil/Army%20Geotagging%20Safety.pdf Geotags and Location-Based Social Networking], US Army</ref>.
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Geocoding can be done in the following ways<ref name="Geo_photo"/>:
Geocoding can be done in the following ways<ref name="Geo_photo"/>:
* Automatic with embedded GNSS receiver: The GNSS receiver is embedded in the camera and when a photo is taken the photo is tagged with the position information coming from the receiver.
* Automatic with embedded GNSS receiver: The GNSS receiver is embedded 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 connected 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.
* Automatic with connected GNSS receiver: The GNSS receiver is connected to the camera either by a wired or a Bluetooth connection 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
* 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.
* Manual Geocoding: The photo coordinates are determined offline through a mapping software where the user marks the location where the photo was taken.




These applications are considered non-critical applications.
These applications are considered non-critical applications.


The precision required by these applications is low, being the current accuracy provided by civilian GPS enough.
The accuracy required by these applications is low, being the current accuracy provided by civilian GPS enough.




== Privacy Issues ==
== Privacy Issues ==


As with social networking, photo geocoding has privacy issues to be considered. GNSS-enabled [[Wikipedia:Mobile phone|mobile phones]] automatically geocode pictures by default. Usually most users are not aware that location is being embedded in all photos taken and that this will be visible when they post photo is photo sharing sites or social networks<ref name="Geo_Safety"/>.
As with [[Social Networking|social networking]], photo geocoding has privacy issues to be considered. GNSS-enabled [[Wikipedia:Mobile phone|mobile phones]] automatically geocode pictures by default. Usually most users are not aware that location is being embedded in all photos taken and that this will be visible when they post photos in photo-sharing sites or social networks<ref name="Geo_Safety"/>.




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Most GNSS-enabled phones will geocoded photos by default.  
Most GNSS-enabled phones geocode photos by default.  


Examples of photo sharing sites that used geocoded data are <ref name="Geo_photo"/>:
Examples of photo sharing sites that used geocoded data are <ref name="Geo_photo"/>:
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* [http://www.panoramio.com/ Panoramio]: Geolocation-oriented photo sharing website.
* [http://www.panoramio.com/ Panoramio]: Geolocation-oriented photo sharing website.
* [http://moblog.net/home/ moblog]: Mobile photo blog that supports geocoding.
* [http://moblog.net/home/ moblog]: Mobile photo blog that supports geocoding.
* [http://www.google.com/earth/ Google Earth] and [http://www.google.com/maps/ Google Maps]: Geocoded photos can be can be accessed as a layer in Google Earth and Google Maps.
* [http://www.google.com/earth/ Google Earth] and [http://www.google.com/maps/ Google Maps]: Geocoded photos can be accessed as a layer in Google Earth and Google Maps.




Revision as of 01:28, 9 April 2011


ApplicationsApplications
Title Photography Geocoding
Author(s) Rui Barradas Pereira.
Level Basic
Year of Publication 2011
Logo GMV.png


The popularity of applications, such as Google Earth and Google Maps, and the possibility of posting georeferenced pictures lead to the need of geocoding photos. A geocoded photo has the location of the photographer embedded 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 practical way of geocoding photos is by doing it automatically on the camera if the camera has an embedded GNSS receiver or can be connected to an add-on GNSS receiver. GNSS-enabled mobile phones usually geotag photos 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 embedded GNSS receiver: The GNSS receiver is embedded 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 connected to the camera either by a wired or a Bluetooth connection 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 through a mapping software where the user marks the location where the photo was taken.


These applications are considered non-critical applications.

The accuracy required by these applications is low, being the current accuracy provided by civilian GPS enough.


Privacy Issues

As with social networking, photo geocoding has privacy issues to be considered. GNSS-enabled mobile phones automatically geocode pictures by default. Usually most users are not aware that location is being embedded in all photos taken and that this will be visible when they post photos in photo-sharing sites or social networks[2].


Application Examples

Despite the low price of GNSS chipsets only a few cameras have built-in GNSS capabilities, such as [3][nb 1]:

  • Sony SLT-A55
  • Sony Cyber-shot DSC-HX5
  • Panasonic Lumix DMC-ZS7 (Lumix DMC-TZ10)
  • Fujifilm FinePix XP30
  • Pentax Optio WG-1 GPS
  • Canon SX230 HS
  • Samsung SH100
  • Casio Exilim EX-H20G
  • Leica V-LUX 20


Some other cameras support GNSS positioning as an option such as[3][nb 2]:

  • Recent Nikon DSLRs
  • Samsung NX11
  • Samsung NX100


Most GNSS-enabled phones geocode photos by default.

Examples of photo sharing sites that used geocoded data are [1]:

  • Flickr: Photo sharing site that supports geocoding.
  • Panoramio: Geolocation-oriented photo sharing website.
  • moblog: Mobile photo blog that supports geocoding.
  • Google Earth and Google Maps: Geocoded photos can be accessed as a layer in Google Earth and Google Maps.


Notes

  1. ^ This list is not exhaustive and was compiled in April 2011
  2. ^ This list is not exhaustive and was compiled in April 2011

References

  1. ^ a b c Geotagged photograph in Wikipedia
  2. ^ a b Geotags and Location-Based Social Networking, US Army
  3. ^ a b dpreview.com
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