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Originally Posted by navin I know the landmark by what it is called. The Singapore Zoo is the Singapore Zoo. I dont need GPS to tell me that.
I assume the "kunzum pass" will be marked too. Or is that the "kunzum pass" wil be called something else or is not marked correctly? I am still confused. |
I just used that as an example. <ets say you are driving from village A to village B which are 60kms apart. In between there a 3 mountain passes.
As you drive, you keep clicking pics.
With GPS tagging a year later I will know which pic was taken where. As for kunzum pass, there is a signboard, but what about pics 100 meters before the signboard, and 100 meters after the signboard.
A zoo, a theater etc., is very different. I never geotag such pics. for example if on my trip I visit a zoo, only 1 pic taken outside the zoo with have geotag. Once I am out of my vehicle, and moving around inside the zoo, there will be no geotags.
However, even there if I have a pocket gps, I can take pics of the animals, and later, each pic will show the approximate location of each animal enclosure!
Moreover, this information is hidden in the EXIF. User is not shown that information unless the user actually goes through the IPTC or EXIF completely
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I respect TSK (he knows that) hence I wonder what does he know that I dont. I hate to use technolgoy just for the sake of it (also becuase I not very good with technology - atleast not as good as the youngsters here). It has to solve a real world problem otherwise it just slows me down.
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No slowing down here. All I need to do is run the program, and it does the photo tagging. Very little effort on my part
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Ok 3 questions.
a. how does your camera know and where does you camera log in this information? The information is appended to the EXIF information?
b. When I upload pics from my camera I get a serial number not a name. How do I get it to say "Singapore Zoo 17/8/10 12:10:07" instead of "DSC-0001".
c. why would a user want to go to Google Maps? If I label a pic as "Chushul and Rezang-la War memorials" I assume the user would takt that as face value na?
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Your answers
a. Camera only knows what time and date the picture is taken. So before taking pics, I align my camera clock to exactly 5.5 ahead of GMT as shown by my GPS clock.
b. I also get just a number. You have to look at the EXIF information to see the date and time of picture taken. EXIF is embedded inside the JPEG(or RAW). Most software programs like photoshop/Gimp/Canon DPP show complete EXIF. Many other free software programs also show complete EXIF
c. Yes, I can label that. but what if while driving from Chushul to Rezangla, I climb a narrow uphill unmarked road, and click a pic of an intersting plain.
If a user wants to know the exact location where I clicked that pic from, the GPS information embedded inside the EXIF will tell the user that.
Again, to explain what exactly is Geotagging.
There are two devices.
1. the Camera - Whenever the camera clicks the pic, it embeds the date and time taken. For example, lets say I took a pic on 2009-09-01T03:35:55Z This means 1 September 2009 03:35:55 UTC which is 9:05:55am India Time
2. The GPS - It keeps dumping "Latitude/Longitude/Altitude" with time stamp in a file. Here is a snippet
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<trkpt lat="32.779725000" lon="78.974696700">
<ele>4293.351840</ele>
<time>2009-09-01T03:35:46Z</time>
</trkpt>
<trkpt lat="32.779610000" lon="78.974735000">
<ele>4292.041200</ele>
<time>2009-09-01T03:35:51Z</time>
</trkpt>
<trkpt lat="32.779481700" lon="78.974776700">
<ele>4291.035360</ele>
<time>2009-09-01T03:35:55Z</time>
</trkpt>
<trkpt lat="32.779295000" lon="78.974845000">
<ele>4289.633280</ele>
<time>2009-09-01T03:35:57Z</time>
</trkpt>
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Now the software program will load this file, and look at my picture. it will see the time. Then it will search for the trkpt which is the nearest in time to the picture taken time. That is the GPS location where picture was taken.
At my end, all extra I have to do is
1. Download all pictures to my PC - This we all do
2. Download GPX track from my GPS on my PC
3. run GPICSYNC giving it path to pictures folder, and the GPX file
All pictures are embedded with the GPS information, whenever the nearest trackpoint is within 300 seconds of picture taken.
The 300 sec thingy can be tuned in software. If you want more accuracy, then you can use 50 seconds.