When we refer to time we can say “It’s 2 PM”. This is easy enough to understand. It is early afternoon at our current location.
Digital cameras record date and time in a similar manner. When you load a photo onto your computer, you can see the time as recorded by the camera: 2 PM. The computer, however, cannot make much sense of this information. It is missing an important clue: location or time zone. For all it knows, “2 PM” could mean early afternoon in Hawaii or early afternoon in New York. A 6-hour difference!
What’s more, the camera clock may not actually have the correct time. You could have forgotten to set it as you traveled through time zones. Your photo of the New York night sky could indeed show a “2 PM” camera time.
We thus face two tasks:
- Set the correct time on the photo. E.g. “2 PM Hawaiian time”
- Make that time look “right”. E.g. “8 PM New York time”
Let’s walk through the process.
Continue reading Correct the Date and Time of Photos using HoudahGeo 6.0
In part 1
of this blog post series, we looked at how you can use your GPS enabled smartphone to get geotags on your regular camera pictures. There is, however, a more sophisticated way to put your smartphone to use. It’s an app called gps4cam pro
Part 2 – Geocoding using the smartphone app gps4cam
Continue reading Geotag your photos automatically – part 2
Digital cameras record the exact time each photo was taken. HoudahGeo relies on this information to match photos to a GPS tracklog. Unfortunately, most digital cameras fail to specify which time zone the recorded time is expressed in. I.e for a photo taken at noon, HoudahGeo cannot tell if it was noon in Los Angeles, or in Luxembourg, etc.
HoudahGeo thus needs a little help to make sense of the camera timestamps. Getting camera clock setup right is essential for automatic geocoding to work.
Continue reading Automatic geocoding: Camera clock setup