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EXIF File Header information from ExifTool on Mac OS X

I've recently got quite excited by photographs that have been geotagged with location information. This is an example of EXIF file header which can be found in files. I have highlighted the GPS location information which is stored by the Apple iPhone 3G.

ExifTool is useful tool. It is essentially a file editor that enables this information to be modified.

 


 

ExifTool Version Number 7.41
File Name jamboree-small.jpg
Directory /Users/jonathan/Desktop
File Size 28 kB
File Modification Date/Time 2008:08:30 23:54:50
File Type JPEG
MIME Type image/jpeg
JFIF Version 1.01
Exif Byte Order Big-endian (Motorola, MM)
Make Apple
Camera Model Name iPhone
Orientation Horizontal (normal)
X Resolution 72
Y Resolution 72
Resolution Unit inches
Modify Date 2008:08:01 20:21:27
F Number 2.8
Date/Time Original 2008:08:01 20:21:27
Create Date 2008:08:01 20:21:27
Color Space Uncalibrated
Exif Image Width 360
Exif Image Height 263
Gamma 2.2
GPS Latitude Ref North
GPS Longitude Ref West
Compression JPEG (old-style)
Thumbnail Offset 191
Thumbnail Length 5904
Date/Time Digitized 2008:08:01 20:21:27+00:00
Profile CMM Type ADBE
Profile Version 2.1.0
Profile Class Display Device Profile
Color Space Data RGB
Profile Connection Space XYZ
Profile Date Time 2000:08:11 19:51:59
Profile File Signature acsp
Primary Platform Apple Computer Inc.
CMM Flags Not Embedded, Independent
Device Manufacturer none
Device Model  
Device Attributes Reflective, Glossy, Positive, Color
Rendering Intent Perceptual
Connection Space Illuminant 0.9642 1 0.82491
Profile Creator ADBE
Profile ID 0
Profile Copyright Copyright 2000 Adobe Systems Incorporated
Profile Description Adobe RGB (1998)
Media White Point 0.95045 1 1.08905
Media Black Point 0 0 0
Red Tone Reproduction Curve (Binary data 14 bytes, use -b option to extract)
Green Tone Reproduction Curve (Binary data 14 bytes, use -b option to extract)
Blue Tone Reproduction Curve (Binary data 14 bytes, use -b option to extract)
Red Matrix Column 0.60974 0.31111 0.01947
Green Matrix Column 0.20528 0.62567 0.06087
Blue Matrix Column 0.14919 0.06322 0.74457
Image Width 360
Image Height 263
Encoding Process Baseline DCT, Huffman coding
Bits Per Sample 8
Color Components 3
Y Cb Cr Sub Sampling YCbCr4:2:2 (2 1)
Aperture 2.8
GPS Latitude 51 deg 51' 18.00" N
GPS Longitude 1 deg 14' 32.40" W
GPS Position 51 deg 51' 18.00" N, 1 deg 14' 32.40" W
Image Size 360x263
Thumbnail Image (Binary data 5904 bytes, use -b option to extract)

 

Comments

What a dream - does it do altitude? Does it do 'the direction I am facing'? Then it could label my photos with what is in the view too. But, as always, data is subject to human cock-up - a salutary reminder in these days of storing data for everything. In this case I reckon you are E not W at Thorpe le Soken!

Richard,

Only you could spot that and I wondered if anyone might! When I first played with the mapping tool, it put a pointer on the map at Oxford, curiously in a farmers field which was VERY similar to the Jamboree site, but something about the land and boundaries didn't look quite right. Take a look.

That's when I figured something was awry and then needed to use ExifTool to see if I could edit the file header information... but then it was easier just to edit the database... lol. I'm clearly back to quick hacks rather than getting the original data right. Oh dear. Of course a dear work colleague and mentor at a certain lab in Chelmsford wouldn't have let me get away with such things.

There seems to be some GPS fault with the iPhone's understanding of E and W, and N and S.

Someone has written an AppleScript to script changing the N/S and E / W variables here...

 

Fix iPhone geotagged images for certain geographies

 

J

 

 

 

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