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Pocket GPS World :: View topic - DashCam Footage - How to Check for GPS Data
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DashCam Footage - How to Check for GPS Data
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Kremmen
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Joined: Mar 03, 2006
Posts: 6391
Location: West London & Reading

PostPosted: Tue Sep 25, 2018 8:53 am    Post subject: Reply with quote

Thumbs Up Yes, M8 told me that yesterday.

The bottom line here seems to be that the data is held per frame but getting at it is something else.

Need a hexadecimal display tool to investigate, and some knowledge of what you're looking at, which I don't have.
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M8TJT
The Other Tired Old Man
The Other Tired Old Man


Joined: Apr 04, 2006
Posts: 10118
Location: Bexhill, South Sussex, UK

PostPosted: Tue Sep 25, 2018 10:36 am    Post subject: Reply with quote

Kremmen wrote:
M8 calculated that at 60mph the position will change by about 200 feet each second.
No he didn't. 60MPH is 88 ft/sec. What he did say was that 1 second of latitude is about 100 ft. and 1 second of longitude is about 100 x Cos(lat) which at 50 degrees N or S is about 65 ft.

Rough calculation 1 degree of latitude = 60 nautical miles (nm) by early definition. Therefor 1 min of lat = 60nm/60mins =1 nm. 1nm is approximately 6,000 ft. so 1 second of latitude is 6,000ft/60secs = 100 ft.
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pcaouolte
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Joined: Dec 27, 2006
Posts: 998
Location: South Lincs, UK.

PostPosted: Tue Sep 25, 2018 11:05 am    Post subject: Reply with quote

Kremmen wrote:
Need a hexadecimal display tool to investigate, and some knowledge of what you're looking at, which I don't have.
If you want to upload a short video somewhere that I can get it I could have a look later to see if I can find the GPS data. I have a hex editor and knowledge of the layout of the mp4 files and several dashcam data formats. Are you just trying to verify that the GPS data is being recorded or do you need to extract the data?
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Kremmen
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Joined: Mar 03, 2006
Posts: 6391
Location: West London & Reading

PostPosted: Tue Sep 25, 2018 11:18 am    Post subject: Reply with quote

M8TJT wrote:
Kremmen wrote:
M8 calculated that at 60mph the position will change by about 200 feet each second.
No he didn't. 60MPH is 88 ft/sec. What he did say was that 1 second of latitude is about 100 ft. and 1 second of longitude is about 100 x Cos(lat) which at 50 degrees N or S is about 65 ft.

Rough calculation 1 degree of latitude = 60 nautical miles (nm) by early definition. Therefor 1 min of lat = 60nm/60mins =1 nm. 1nm is approximately 6,000 ft. so 1 second of latitude is 6,000ft/60secs = 100 ft.


You were above my head and I only remembered the highlights Embarassed
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Kremmen
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Joined: Mar 03, 2006
Posts: 6391
Location: West London & Reading

PostPosted: Tue Sep 25, 2018 11:19 am    Post subject: Reply with quote

pcaouolte wrote:
Kremmen wrote:
Need a hexadecimal display tool to investigate, and some knowledge of what you're looking at, which I don't have.
If you want to upload a short video somewhere that I can get it I could have a look later to see if I can find the GPS data. I have a hex editor and knowledge of the layout of the mp4 files and several dashcam data formats. Are you just trying to verify that the GPS data is being recorded or do you need to extract the data?


Again, above my head. I think MaFt might like a dabble though (not)
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Garmin 2599 LMT-D (Indoor test rig)
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