gps photo geotagging - meetupfiles.meetup.com/1483309/gps photo-tagging.pdf · 2012-02-21 · gps...

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



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



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



Geotagging in film days

Geo tagging today



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”



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



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/



Questions

gps photo geotagging - meetupfiles.meetup.com/1483309/gps photo-tagging.pdf · 2012-02-21 · gps...

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