GPX and Photo EXIF Differences

Mike_V,

Thank you for your report. What are you using to reviewing these details (Lat./Long. and Heading) about the video file?

I'm using PhotoShop to review the EXIF data in the photos and comparing the lat/lon to that found in the GPX file using the timestamp.

pedalingsquares

My apologies. I cannot reproduce the lat/lon discrepancies. I'm not sure what happened the first time.

However, the heading issue remains. The heading on one image should be 252T and it reads 4294967191/1

Mike

Thanks, MIKE_V. I'll look into this and see if I can duplicate. If you don't take a photo while recording a video is the heading information accurate?

Good question. I'll have to experiment. Where does the heading come from? Does it depend on movement?

That's the question I'm trying to answer. To my knowledge we shouldn't be writing heading information because the VIRB Elite only uses a GPS compass. This means that movement over 2.3 mph is necessary and faster speeds only improve the compass reading. The reason we wouldn't write it out is because the probability of a bad heading value being written at very low speeds or standing still is likely. Therefore we'd just remove it. I looked at several photos in PhotoShop this morning and none showed heading data. Can you tell me which tab your finding this data under? Are you looking under File > File Info > GPS Data?

I'm using PS CS4 which doesn't have a GPS tab; I look at the raw data tab.

I have two photos taken during a video while flying. The speed was 80 kts. For the first, the track was about 252T and the EXIF "Direction" was "4294967191/1". The second was taken while on a track of 74T and the direction is shown as "74".

I just looked at some of the pictures I recently took with my VIRB Elite, and I don't see heading in the EXIF data. For example (once again the lack of a fixed width font here is going to screw things up):

mp$ exiftool VIRB0066.JPG
ExifTool Version Number : 8.65
File Name : VIRB0066.JPG
Directory : .
File Size : 3.6 MB
File Modification Date/Time : 2014:03:09 19:41:16-04:00
File Permissions : rwxrwxrwx
File Type : JPEG
MIME Type : image/jpeg
Exif Byte Order : Little-endian (Intel, II)
Document Name : VIRB
Image Description : VIRB Picture
Make : Garmin
Camera Model Name : VIRB
Orientation : Horizontal (normal)
X Resolution : 96
Y Resolution : 96
Resolution Unit : inches
Software : VIRB
Modify Date : 2014:03:09 18:41:16
Y Cb Cr Positioning : Co-sited
Copyright : Copyright 2013
Exposure Time : 1/11
F Number : 2.0
Exposure Program : Aperture-priority AE
ISO : 0
Exif Version : 0210
Date/Time Original : 2014:03:09 19:41:16
Create Date : 2014:03:09 19:41:16
Components Configuration : Y, Cb, Cr, -
Compressed Bits Per Pixel : 1.765645094
Shutter Speed Value : 1/11
Aperture Value : 2.0
Exposure Compensation : 0
Max Aperture Value : 3.6
Metering Mode : Multi-segment
Light Source : Unknown
Flash : No Flash
Warning : [minor] Unrecognized MakerNotes
Flashpix Version : 0100
Color Space : sRGB
Exif Image Width : 4608
Exif Image Height : 3456
Related Sound File : RelatedSound
Interoperability Index : R98 - DCF basic file (sRGB)
Interoperability Version : 0100
Exposure Index : 1
Sensing Method : One-chip color area
File Source : Digital Camera
Scene Type : Directly photographed
Exposure Mode : Auto
White Balance : Auto
GPS Version ID : 2.3.0.0
GPS Latitude Ref : North
GPS Longitude Ref : West
GPS Altitude Ref : Above Sea Level
GPS Time Stamp : 23:41:16
GPS Date Stamp : 2014:03:09
Compression : JPEG (old-style)
Thumbnail Offset : 1536
Thumbnail Length : 4745
Image Width : 4608
Image Height : 3456
Encoding Process : Baseline DCT, Huffman coding
Bits Per Sample : 8
Color Components : 3
Y Cb Cr Sub Sampling : YCbCr4:2:2 (2 1)
Aperture : 2.0
GPS Altitude : 44.6 m Above Sea Level
GPS Date/Time : 2014:03:09 23:41:16Z
GPS Latitude : 28 deg 22' 28.66" N
GPS Longitude : 81 deg 33' 9.85" W
GPS Position : 28 deg 22' 28.66" N, 81 deg 33' 9.85" W
Image Size : 4608x3456
Shutter Speed : 1/11
Thumbnail Image : (Binary data 4745 bytes, use -b option to extract)


The only "/"s I see are in the Shutter Speed and Exposure Time. Is this an old Mac, maybe PPC? Endian problems might explain the weird value.

I'm looking at the raw data as extracted by the XMP plugin in PhotoShop.

The data is valid for one of the photos but not for the other.