How do I read raw computer dive data?

[XS-NRG]

Hi there,

Without getting into a long story, I had a major computer (laptop) failure and have lost everything including my scuba logbook. I have a backup dump file that shows the raw profile data for each dive and I was wondering if anyone knows what the numbers mean and how I can turn them into a readable graph.

An example dive shows the following profile:

000000000000007920000000012800000000012500000000012800000000010970000000011280000000011580000000009750000000006100000000006710000000011580000000011890000000011580000000012800000000013110000000010060000000010670000000014020000000015240000000015240000000017070000000017070000000017370000000015850000000014940000000015850000000014330000000010670000000010970000000009450000000007010000000006710000000008840000000007620000000008530000000007010000000003350000000007320000000008230000000008230000000009140000000010360000000010970000000009140000000009140000000009750000000009750000000009450000000010360000000010360000000008530000000008840000000008840000000007620000000005490000000005790000000006100000000006100000000006400000000006400000000005180000000003660000000004880000000004880000000003960000000004270000000004570000000005180000000000000000000

It was a 35 minute dive to a max of 57 feet. I'm trying to determine what these numbers mean. At 0:30 into the dive it was approx 18.5 feet. I'm wondering how the first number in this raw info (792) converts to 18.5 ft. Is it PSI, BAR, cm, mm?? Just trying to understand the correlation of each number in the above output to an appropriate depth so I can create a usable graph in a new online log book I'm creating.

Anyone know the answer to this? Any programmers or manufacturers on here that can help me out with the info?

Many thanks

 

[elmo]

A good starting point would be to say what software this came from, and what dive computer. That it is in decimal numbers should make the job a little easier.

 

[MargaritaMike]

On the 4th row of numbers the third set of non-zero numbers is 1737. 1.737*33' =57.3 feet. I just spent a few minutes, but I would want to do some more modeling to come up with the profile. I don't know what the sample rate of your computer is so I'm not sure when you were at what depths other than the 18.5 feet which doesn't fit anything right off. It would also help to know if you have any other data to compare. Did you do a safety stop? What depth? How long? There are 68 non-zero groups. At one every 30 seconds that would equal 34 minutes.

The correlation that I found may be meaningless. Just a shot. I like puzzles, especially math puzzles.

Cheers - M²

 

[XS-NRG]

Sample rate is every 30 seconds from a Suunto EON Steel and Suunto Zoop. Looks like everything is grouped in 12. This is from Diving Log by Sven Knoch

 

[Oz Chris]

Have you tried contacting Sven. By all reports he’s incredibly helpful. He fixed a corrupted dive log for me.

 

[XS-NRG]

I haven't, but I've also now just figured this out.

Take the whole string and break into segments of 12. Then take the first 5 numbers of each set of 12. Divide by 100 and that's your depth in meters. Then multiply by 3.2808399 to get depth in feet.

 

[Neilwood]

Apologies to butt in here as I can't help with analysing the data but it is worth making the comment to anyone that reads this thread (and apologies for the emphasis but I think there is a good point to it)

Always back up your data to at least one additional place.

If you have a digital log on a PC, back it up to an external drive or a cloud based system. This is one reason I use Subsurface - I have access on PC and phone and it backs up to the cloud (which is free). This means my log gets saved 3 times - once to the PC, once to Subsurface cloud and once in my PC backup.

 

[MargaritaMike]

Where is the cloud? Who provides it and stores your data for you? Have you ever complained about the NSA eavesdropping? They don't have to eavesdrop. People GIVE them their info.
@XS-NRG I'm glad you figured it out. That's kind of where I was heading. Two good points have been made. 1. Contact Sven. 2. Back up your data in multiple places. My rule of thumb is to back it up twice. Real important data gets backed up to three diferent places none of which are the "cloud".

Cheers - M²

 

[atdotde]

The cloud is a git server operated by the maintainer of Subsurface. But if you don't trust him, you should never run any binary software provided by him: The software can access the data your are worried about and much more. As long as you run his software (and of course that holds for any software) he does not need your data on his cloud server to do evil things. Being afraid just because something is called a "cloud" does not really make sense.

 

[XS-NRG]

Yes I agree about the backing up. Have never really liked the idea of cloud stuff before but this might have changed my mind.