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Tag: EXIF

HoudahGeo 6: A New Way of Lining Up Photos with a GPS Track

Automatic geocoding in HoudahGeo matches photos to a GPS track log. A track log is a record of where you have been. A GPS app or track logger records your current position and the current time. It does so every few seconds and thus creates a breadcrumb trail of your travels.

HoudahGeo figures out where you took a photo by matching the timestamp on the photo with the times in the GPS track log. While the GPS device gets accurate time information from satellites, your camera clock is probably not accurate. Most cameras also do not record time zone information: the photo coming out of the camera may say it was taken at 12 PM, but there is no telling if that is to be understood as 12 PM east coast or west coast – a 3-hour difference.

Timestamps in HoudahGeo

HoudahGeo needs to know the exact time a photo was taken. That is why HoudahGeo asks about camera clock settings when you import images.

There are 4 ways you can tell HoudahGeo about your camera clock settings. The first 3 are found in the Load > Camera Setup… panel. This panel pops up automatically when you import photos that lack time zone information.

You can skip Camera Setup… – accept the current settings – and proceed to import more images and GPS track logs. We will correct the camera clock settings later by matching a key photo to a spot on the track log. Continue reading HoudahGeo 6: A New Way of Lining Up Photos with a GPS Track

What’s New in HoudahGeo 6.1?

HoudahGeo 6.1 builds upon last year’s HoudahGeo 6 release to bring you the most comprehensive photo geocoding and geotagging solution for Mac.

KESTREL Weather Log Files

HoudahGeo 6 can add weather information – ambient temperature, air pressure, and humidity – to your photos. Such data can be recorded using KESTREL Drop devices. HoudahGeo 6.1 adds support for more variants of the KESTREL CSV log file format.

Weather Data From GPX Files

Some GPS devices can record weather information along with tracklogs. HoudahGeo 6.1 can now read weather data from GPX files that use the Garmin TrackPointExtension format to store such data.

Scuba Dive Data From GPX Files

HoudahGeo 6 can add scuba diving information like depth below water to your photos. Typically this information is obtained from UDDF dive log files.

Some dive computers and dive logging software can create GPX tracklog files. HoudahGeo 6.1 can now dive log data from GPX files that use the Garmin TrackPointExtension format to store such data.

Apple Aperture on macOS Catalina and Big Sur

HoudahGeo now works with Aperture versions modified by Retroactive to run on recent versions of macOS. Read more…

Further Enhancements

Adobe Lightroom: HoudahGeo now supports Lightroom libraries set up with symbolic links to preview files.

Apple Photos: HoudahGeo now reads malformed XMP sidecar files created by the Export Originals function of the Apple Photos application.

Performance: HoudahGeo 6.1 improves performance when working with large projects.

Window Layout: HoudahGeo now remembers the width of the media browser and inspector panes when switching between processing steps.

Working With the File Info Pane

HoudahSpot uses the macOS Spotlight index for ultra-fast file searches. By building upon Spotlight, HoudahSpot can find files by name, text content, as well a wide variety of file properties and metadata.

Spotlight in turn relies on importer plug-ins to read all kinds of files. When indexing a file, Spotlight calls upon the plug-in that specializes in the file type at hand to extract text and metadata. Such importers are installed with the system and with applications that introduce new file formats.

The Info pane in HoudahSpot shows the information available for a given file. This is the metadata that the importer plug-in has shared with the Spotlight index.

File Info Pane: All Metadata
Photo file metadata

Continue reading Working With the File Info Pane

Using HoudahGeo 6 With Cameras That Provide Altitude or Heading Measurements

Geocoding using GPS data is arguably the quickest method of adding location information to photos. The GPS data comes in the form of a tracklog file recorded by a GPS device or smartphone app. Every few seconds a record of the current time and location is added to the tracklog.

Besides location coordinates, the GPS device can record additional information like altitude, heading, or speed. When HoudahGeo matches photos to the tracklog it can copy both location coordinates and such additional information to photo metadata.

At the same time, some cameras have sensors that can provide such additional information even when not using a GPS receiver to add location coordinates to a photo.

A compass built into the camera body can, for example, provide viewing direction information. This would be more accurate than a view direction computed from the direction of travel between to locations recorded in the tracklog.

When the same information is available from two sources – the GPS tracklog and photo metadata – you are left with the choice of which to trust.

Continue reading Using HoudahGeo 6 With Cameras That Provide Altitude or Heading Measurements

Summer: Time to Travel Reminisce

Summer is here. Summer holidays are just around the corner. This is the time of year when many of us usually plan to travel and explore the world. Not so this year.

Explore. Reminisce. Show

This year we can reminisce about past travels and adventures. This summer we can dig into our well-organized photo collections. Photos organized by location now allow us to virtually jump around the globe and through time. We can explore photos in Google Earth to feel teleported to places we had the luck to visit. With photos pinned to precise map locations, we can retrace our steps in Google Maps. Nothing refreshes the memory like photos combined with the aerial views that reveal how the individual pictures connect.

Photos on Google Maps
Photos on Google Maps: Visit to Taj Mahal

Continue reading Summer: Time to Travel Reminisce

Correct the Date and Time of Photos using HoudahGeo 6.0

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.

Photo with incorrect time

We thus face two tasks:

  1. Set the correct time on the photo. E.g. “2 PM Hawaiian time”
  2. 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

Using HoudahGeo With Cameras That Provide Altitude Measurements but No GPS Coordinates

This blog post applies to HoudahGeo 5. HoudahGeo 6 offers much more flexibility in handling multiple sources of altitude and heading information.

Some GPS cameras use a barometer to determine the current altitude. These cameras can write altitude information to photos even when the GPS feature is switched off. This is often seen in Panasonic cameras.

The camera creates photos that have altitude information, but lack latitude and longitude coordinates. This comes as a bit of a surprise to HoudahGeo and requires a few additional clicks on your part.

Continue reading Using HoudahGeo With Cameras That Provide Altitude Measurements but No GPS Coordinates

Adjust Photo Times to Match Local Time

This summer, we travelled to Florida. I did not bother to adjust the clock on my camera to match local time. I left it set to my home time zone: Central European Summer Time (CEST).

When the time came to geotag photos from the trip, I just had to tell HoudahGeo that the camera clock was set to CEST. With this extra bit of information, HoudahGeo was able to figure out at what exact time each photo was taken. It then matched these times to GPS track logs to find where the photos were taken.

This photo of a Key Deer was indeed taken on Big Pine Key, Florida.

Key deer at 4 PM EDT. Or as the camera had it: 10 PM CEST
Key deer at 4 PM in Florida. Or as the camera had it: 10 PM European time.

According to my camera, the above photo was taken at 10 PM. This is at odds with what we see in the picture: broad daylight.
Continue reading Adjust Photo Times to Match Local Time