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Subsurface, Photos and Depth

Discussion in 'Dive Software' started by divinh, Jun 5, 2019.

  1. divinh

    divinh Photographer

    # of Dives: 100 - 199
    Location: San Francisco
    720
    279
    63
    A dive trip ago, I discovered the Media feature in Subsurface, which allows adding Photos and Videos into Subsurface and having them appear in a dive graph. With the feature in mind, I decided to try my hand at doing some citizen science, i.e. take photos of critters and provide as much info as I could, like date, time, dive site location and depth, for scientists to use.

    Getting the depth information is what's eluding me. I can hover over a photo with the pointer and get it to enlarge, but I can't get the depth "exactly" when I took the photo. The depth is updated as I move the pointer, so I'm getting the depth under the pointer, not of when the photo was taken. I want the depth at the timestamp of when the photo was taken.

    Is there a way in Subsurface for me to see the depth of a photo based on the timestamp of the photo?
     
  2. caruso

    caruso Banned

    # of Dives: 200 - 499
    Location: Long Island, NY
    1,663
    1,190
    113
    Right click on the photo and click "add setpoint change" or "add bookmark".

    A little yellow triangle or dive flag will appear directly below the photo almost right on to of the depth graph. Perhaps not exact but close enough.
     
  3. divinh

    divinh Photographer

    # of Dives: 100 - 199
    Location: San Francisco
    720
    279
    63
    Thanks for the tip, but when I hover over the dive flag bookmark, it still changes value over a range in the graph.

    Since I sync'ed the time between the dive computer and the camera, I was hoping that the depth could be shown "exactly" when the photo was taken.
     
  4. caruso

    caruso Banned

    # of Dives: 200 - 499
    Location: Long Island, NY
    1,663
    1,190
    113
    When I hover over the newly placed dive flag/bookmark nothing happens. I can estimate the depth of the photo to within about 5' or so. I don't think you'll be able to get it closer than that unless you zoom way in, capture it as a screen shot, print it out and use a ruler to measure and place more precise markings on the graph.
     
  5. divinh

    divinh Photographer

    # of Dives: 100 - 199
    Location: San Francisco
    720
    279
    63
    Since the dive computer sampling is already 20 or 30 seconds (depending on which dive computer I'm looking at), I already know it's not going to be precise, but being able to get the depth at the photo timestamp would be at least closer than hovering, I'm hoping.
     
  6. caruso

    caruso Banned

    # of Dives: 200 - 499
    Location: Long Island, NY
    1,663
    1,190
    113
    I laid a mm ruler against my subsurface logbook screen and using the provided markings and simply dividing them up into equal segments I was able to figure out the depth at the picture location to the nearest foot.

    Not only is sampling rate going to effect the result along with the "ruler against the screen" method but odds are your dive computer time and your camera time are not going to be exactly the same either. You're going to have to accept some slop in the numbers. Only way to get around that is to check your depth during the dive at the exact moment that you snap a picture. Or take a second picture of the face of your computer showing the depth.
     
  7. divinh

    divinh Photographer

    # of Dives: 100 - 199
    Location: San Francisco
    720
    279
    63
    I'm willing to accept slop in the data. I don't think I have a choice given how infrequently the data was sampled. I'm just looking for a way to get the depth at the photo timestamp, to minimize the slop of just hovering the pointer.
     
  8. atdotde

    atdotde Solo Diver

    # of Dives: 200 - 499
    Location: Munich, Germany
    140
    108
    43
    Somebody in the past had exactly that problem. To this end, an option „export image depths“ was added to the dive export menu. This writes. File listing all the images and their corresponding depths.
     
    Schwob and divinh like this.
  9. divinh

    divinh Photographer

    # of Dives: 100 - 199
    Location: San Francisco
    720
    279
    63
    Nice! This will do for now. Thanks!
     

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