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Dinner & Class ‐ Geotagging 2/18/2012
www.HoustonPhotowalks.com 1
GPS Photo‐ / Geotagging
Houston PhotowalksHouston PhotowalksGerard Gaal
Dinner & ClassSaturday, February 18, 2012Railroad Crossing BBQ
http://www.houstonphotowalks.com
Agenda
• GPS – What is it?
• GPS – How does it work?
• Is / Is not
• Geotagging in the film days
• Geotagging today
• Workflow
• Devices
• Tips & Tricks
Dinner & Class ‐ Geotagging 2/18/2012
www.HoustonPhotowalks.com 2
GPS – What is it?
• 1970s ‐ Developed for the military
• Global Positioning System
• 1983 – Reagan ‐ available for civilian use;
• Precision – pre 2000: 330ft
– Clinton – 2000 – 66ft
– today: 15ft
GPS – How does it work?
• Concept
• Data– Time
– Almanac – app position all satellites
– Ephemeris – detailed position single satellite
Dinner & Class ‐ Geotagging 2/18/2012
www.HoustonPhotowalks.com 3
GPS – How does it work?
• Reduced Precision– Inside buildings
– Urban corridors
– Tunnels
– High‐powered electrical lines
– TreesTrees
– Mountains
– Cell phone
Is / Is not
• Is not– No data feed directly into camera
• Is– Separate deviceSeparate device
– Download data to computer
Dinner & Class ‐ Geotagging 2/18/2012
www.HoustonPhotowalks.com 4
Geotagging in film days
Geo tagging today
Dinner & Class ‐ Geotagging 2/18/2012
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Workflow – part 1
• (Synchronize camera clock)
• Turn on GPS tracker– Waypoint frequency
• Shoot photos
• Download GPS data from GPS d iGPS device– Software / direct feed
Workflow – part 2
• Merge GPS data with photos– Freeware – Geosetter.de
– Sidecar file / Raw file
– Ignore DST
– Digital coordinates• 52.552089 vs. N52°33’7.52”
Dinner & Class ‐ Geotagging 2/18/2012
www.HoustonPhotowalks.com 6
Workflow – part 3
• Import Lightroom / Aperture
• Export to e.g. Flickr or Panoramia, Picasa
Devices
• Manufacturers– Sony, Wintec, Gisteq, Amod, Qstarz and Garmin
• Differences– Battery life (AA 14hr / Lithium 32hr)
– Frequency (fixed vs. user configurable)
– Memory (4MB – 128 MB)– Memory (4MB – 128 MB)
– Software to export files / Direct feed• http://scilib.typepad.com/techreviews/2008/01/gps‐logger‐comp.html
• Google search for: Richard’s Tech reviews gps logger comparison
Dinner & Class ‐ Geotagging 2/18/2012
www.HoustonPhotowalks.com 7
Tips &Tricks
• Do not geotag photos from your home.
• Some cell phones geotag photos automatically;
• Synchronize camera clock– http://www.time.gov
T l• Travel maps– http://www.gpsvisualizer.com/
Travel Map
• http://www.gpsvisualizer.com/
Dinner & Class ‐ Geotagging 2/18/2012
www.HoustonPhotowalks.com 8
Questions