OJW's image locator script
From OpenStreetMap Wiki
Contents |
Introduction
This script can combine a directory full of JPEG images, with a GPX tracklog, to produce a list of latitude/longitudes for each photo.
It takes into account the differences between your camera's clock and the GPS clock if you know them - one way to find this out is to take a photo of the GPS while it's displaying a clock.
Currently, it creates an HTML file showing thumbnails of each photo, with latitude/longitude, time, and the error (the difference in seconds between photo and the the nearest GPS timestamp found)
Source code
OJW's image locator script - source code
Usage
perl ImageLocator.pl [Tracklog file] [Image directory] [GPS time] [Camera time] > output.html
Running the program
- ImageLocator.pl is the perl script (follow the source code link, and save it as a text file called ImageLocator.pl)
Options:
- Tracklog file is a GPX with tracklogs
- Image directory contains a load of JPEGs
- GPS time and camera time refer to the timestamps from GPS and camera respectively, for the same instant.
- GPS and camera times are in the format hh:mm:ss
- GPS time is likely to be using UT, so adjust accordingly.
- Output is to STDOUT as HTML, so > output.html stores that output in a file
Sample data
Bugs
- Not XML-aware, relies on gpsbabel's particular GPX output format
- Only searches backwards in time (i.e. the tracklog just before the photo was taken)
- Complete lack of commenting or neat headers
