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Geotagging workflow with the Amod AGL3080 and Lightroom

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Bryan Villarin says:

Hi everybody,

I'm new to the group and catching up on old episodes.

I just got back from Hawaii and sick of the manual geotagging I had to do. So, I listened to Episode #23 "Listener Questions" and saw that the Amod AGL3080 was specifically mentioned as a good GPS data logger.

I bought it, wrote up a workflow for it and wanted to share.

allnarfedup.com/2008/06/25/my-new-geotagging-workflow-wit...

I hope I didn't leave any gaps. If I did, I'm sure you'll reply back here.

Thanks for the great info!
7:14AM, 25 June 2008 PDT (permalink)

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gunnarsteinn says:

Hi

Excellent workflow.

Mine is very similar except that I use a Mac and use HoudaGeo instead of GeoSetter.
In GPS Babel+ I merge points closer than 10m as the GPX file tends to get very large after a 10 hours.

I also make sure not to mess (keywords, flags, develop,...) with the photos in Lightroom before I set the geo tags as most of it will get lost when you reread the files.

Gunnar Steinn
82 months ago (permalink)

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k2pi says:

It is a good workflow. I also bought the same datalogger after listening to the TWIP podcast, and it's a really nice accessory. I pretty much turn it on whenever I have the camera backpack, and am geotagging everything.

I use Robogeo as software, however. I think it was well worth the purchase price, since some of the really cool things are very automated with this software.

A really neat aspect of this datalogger and the SIRF chipset is that, in many cases, it works just fine indoors! The waypoints tend to wander because of the signal levels sometimes, but has really helped me pinpoint where in some old Castle here in England I was when I took the shot. Very neat device. So far, I've convinced two others to buy one after showing what I could do with mine!
82 months ago (permalink)

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Bryan Villarin says:

Thanks guys!

In GPS Babel+ I merge points closer than 10m as the GPX file tends to get very large after 10 hours.

gunnarsteinn: How do you do this? (Or can you point to a page that explains it?)
I also make sure not to mess (keywords, flags, develop,...) with the photos in Lightroom before I set the geo tags as most of it will get lost when you reread the files.

gunnarsteinn: Personally, this didn't affect pre-existing metadata. Odd. Now I'm a bit scared. =/
A really neat aspect of this datalogger and the SIRF chipset is that, in many cases, it works just fine indoors!

k2pi: Unfortunately, this hasn't been the case for me unless its right next to the window. But, it's only been a day since I've owned it.
82 months ago (permalink)

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Morgan4761 says:

Hi,

Thanks for the input it will help me in the future. Now my question to you that have been geotagging.

I bought the GISTEQ CD110BT as data logger and I don't know if it works as it should (or has the sensitivity that should have).

I got the same strange routes that you can see on the Richard’s Tech Reviews photos, that sometimes your are in the middle of the block when you are really going straight on a street (city maps)

Is it normal to get those points or should I buy a better datalogger/gps tracker.

What I want is simple, if I am standing on a corner of two streets the logger should record the corner coordinates and not some where else.

I know these are "cheap" (around 100 dollar) gps/loggers but a dedicated gps tagger for my D300 cost between 280/330 dollar and I would hate to have the same kind of error/misalingmnet on a dedicated equipment.

Any advise, any suggestion.

Thks.
Carlos
82 months ago (permalink)

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k2pi says:

The accuracy of most GPS devices is 3-10 meters or so under normal conditions. Certain military quality GPS units, or those that use differential navigation (a supplmental radio frequency signal) can do better, but 10 meters is normal, 3 meters very good.

Don't compare these dataloggers to the ones used in vehicles. These have the same accuracy, but through some software trickery, they "lock" the closest GPS waypoint to the nearest road on the map that is displayed, even though that is not where the gps has geo-located you. This can give the impression that these are highly accurate, when it's really a best guess.

If you gather enough waypoints, and your geotagging software supports averaging, you will find that it will very closely show where you were, but this requires collection of more than a few points. Short and sweet: I think yours is fine, but you are expecting dead-on accuracy, and that's not going to be achievable with consumer GPS systems.
Originally posted 82 months ago. (permalink)
k2pi edited this topic 82 months ago.

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Morgan4761 says:

Thanks k2pi,

I think you are right, the problem is my expectation and not the gear. I'll have to keep on testing it.

Really usefull the explanation on the vehicle gps, seing the error on my logger I thought that some kind of software correction was made on the car gps and you confirm it.
82 months ago (permalink)

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koffiejunkie says:

@bryanvillarin, I'm curious, why do you import into Lightroom before you geotag the images? Or do you transfer directly from the camera/card into Lightroom?

I prefer to have a folder structure that I'm in control of, so I copy the files off the card (with a card reader) to the designated folder, run the logs through GPSBabel+, Then load the logs and images into GPSPhotoLinker and run the batch mode. Then only do I import it into Aperture (works the same in Lightroom).
82 months ago (permalink)

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gunnarsteinn says:

@brianvillarin I'm not sure how to merge in the Windows version as the GUI seem's quite different but on the Mac I select Filters and then "Merge waypoints...". I think it is the Waypoint Position option. url: www.gpsbabel.org/htmldoc-1.3.5/filter_position.html

Also I'm not sure why I lost all the metadata, I've probably not used the sidecars when that happened to me. I just make sure now since I don't want to do the same 1-2 hour work twice.

Gunnar Steinn
82 months ago (permalink)

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