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Mattsahib
I am using my Asus P535 phone that has a GPS in it as my GOS I have software that will export a .gpx file to my computer. I shoot images with a Canon 5D in RAW (.crw) But I have finding that the location seems to be off. sometimes a lot. With what little I know about this whole thing of geo tagging images, I am assuming that it is because my clock in my camera and the clock in my GPS are not exact. Could there be another reason? If I am right, how can you sync the two clocks?

Matt

PS I wrote a shot review of sorts on this whole idea of geo tagging using HoudahGeo here: http://thedigitaltrekker.com/news
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houdah
HI!

You are right, clock error is one of the reasons geotagging might be off.

GPS devices usually get exact time from the satellite. Thus you only need to make sure your camera clock is correct. The best source for correct time is a radio controlled clock. If your computer syncs time with a time server, then you may also use the computer's clock as a reference.

If you fin a consistent error, you may want to try adjusting "Clock Error" in "Camera Setup" in the "Images" menu.

Also GPS accuracy varies by receiver brand, location, weather, ...
You may want to check the quality of your track log by using the freeware HoudahGPS to convert the GPX to a KML viewable in Google Earth.

BTW, Google Earth imagery may be off too. Errors happen when images are stitched together. Turn on the "Roads" layer to see if these match up with the roads on the satellite image. If not, the images got shifted.

Best,
Pierre Bernard
Houdah Software s.à r.l.
Houdah Software s. à r. l.
https://www.houdah.com

HoudahGeo: One-stop photo geocoding
HoudahSpot: Advanced file search utility
Tembo: Easy and effective file search
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Mattsahib
I there anyway to make a tracking point and make it link, so to speak, with the first image? In other words, When I start shooting for the day I make some of tracking point where I took the first pictures and then I can go back and compare the time on the tracking point and the time on the exif data of the image. Then I will know how much to adjust the time on the images. Make any since?

Matt
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houdah
Hi!

For now, you would have to open the track log file in a text editor and look for yourself. Remember, the times in the GPX file are expressed in GMT time zone.

In the future, HoudahGeo should display the timestamp alongside the name of the waypoint.

Best,
Pierre Bernard
Houdah Software s.à r.l.
Houdah Software s. à r. l.
https://www.houdah.com

HoudahGeo: One-stop photo geocoding
HoudahSpot: Advanced file search utility
Tembo: Easy and effective file search
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lud
Hi,

I am also having problems to sync my photos with a GPX file using the "camera setup". My camera is "exactly" 1 year behind the GPS, but when i entered -31536000 seconds the new time stamp would vary in time of the day but not in day of the year, the new timestamp would remain one year behind. I have played around and I "think" that HoudaGeo cannot really set up the camera time if the difference in time between the photo file and GPX file is greater than one day.
Am I correct? Is this a bug? or am i using the "camera setup" wrongly.

thanks in advance for the help
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houdah
Hi!

The clock error setting is designed for correcting for clocks running fast or slow. You cannot use it to correct for clocks set to a completely wrong time.

The reason is that the clock error field has no room to store really large numbers.

If you want to correct the times on your photos, I suggest you use the time shift feature of exiftool: [URL=http://www.sno.phy.queensu.ca/~phil/exiftool/#shift]http://www.sno.phy.queensu.ca/~phil/exiftool/#shift[/URL]

Best,
Pierre Bernard
Houdah Software s.à r.l.
Houdah Software s. à r. l.
https://www.houdah.com

HoudahGeo: One-stop photo geocoding
HoudahSpot: Advanced file search utility
Tembo: Easy and effective file search
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lud
Ok,

thank you very much for the prompt reply, I will follow your suggestion.

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