Yosemite in timelapse HD

Discussion in 'Photography' started by Savageduck, Jan 26, 2012.

  1. Savageduck

    Savageduck Guest

    This should provide some incentive for those who have yet to experience
    Yosemite, to make that trip.
    < >
    Savageduck, Jan 26, 2012
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  2. Savageduck

    PeterN Guest

    I had an invitation to go, but cannot make it. thanks for the link
    PeterN, Jan 26, 2012
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  3. Savageduck

    Mark F Guest

    I don't understand how the meteor trails work: it seems like
    meteor trails last too long. Did they:
    1. photograph many more frames than were displayed and edit
    to keep more frames from the brief times when trails were visible.
    2. the field of view is so many miles that trail of a meteor
    moving at perhaps 30 miles/second stay in view long enough
    to look like a moving object? How far apart timewise were
    the displayed frames at about 2:38? I'm bad at estimating things
    and can't decide how many degrees per second things seem to be
    moving. I couldn't find a technical description of the shoot.
    Mark F, Jan 28, 2012
  4. Savageduck

    Savageduck Guest

    I would say there are several things happening here.

    1. The time lapse set at each location is taken over a long enough
    period to include perceived movement of shadows over time, and the fact
    that the cameras are not stationary. they are track mounted and move
    throughout many of the sequences.

    2. I have a feeling that the brain has been fooled into accepting that
    all the light trails are in fact all meteor trails. I am very familiar
    with Yosemite and it is located below some of the most trafficked
    commercial & military aviation routes in the West. Routes between Los
    Angeles and Europe pass over the area, as do routes from SFO,
    Sacramento, & Fresno to and from Las Vegas, the South-West and other
    Southern States. I have many shots of Yosemite in daylight where the
    sky is filled with aircraft contrails. Also consider that there are
    many directional changes for those captured light trails.
    A check of various domestic routes show examples of Delta flights
    between LA, Seattle, Portland, & Europe over flying Yosemite, as do
    flights between SFO, Oakland & Atlanta.
    When it comes to United Airlines they have 100's of flights between
    SFO, Oakland, San Jose, Dallas, Las Vegas, Houston, Tucson, Phoenix,
    Orlando, and destinations in South America, all fly over Yosemite.
    That is just two of the many airlines flying similar routes.

    My conclusion is, that while some brief flashes of meteor trails might
    have been captured, the majority of what was seen were a mix of meteor
    and mostly aircraft navigation lights, and the brain has been led to
    believe it had seen nothing but meteor trails.
    Savageduck, Jan 28, 2012
  5. I agree. Something not right here.
    I have been an amateur astronomer for many years.
    The sky on the videos moves per earth rotation but the
    flashes continue straight. They are moving very slowly,
    what ever they are, just a few mph.

    Many are identical repeats. Meteors often never make it from
    horizon to horizon. They fade out.
    I don't see any flashing marker lights from very slow moving
    aircraft or weather balloons.
    Something tells me that many of the effects are digitally
    drawn in later. And not just on the night vids.
    Nice vids, but not real.
    Paul in Houston TX, Jan 28, 2012
  6. Savageduck

    NM5K Guest

    Most I saw were obviously aircraft flying over.
    I think the reason you don't notice the marker lights
    is that they were using long exposures and the markers
    tend to blend together to make one long streak.
    They only look like repeats because they are all flying
    the same airways. IE: J58-80 runs right across the park
    a bit north of Mammoth Lakes running E-W on a line
    pretty much from Oakland to Manteca, and then over to
    Coaldale NV. There are others, and also an intersection
    pretty much right over the park. Some may make turns
    at that intersection. The planes flying regular jet airways
    airways will not be flying perfect tracks, but pretty
    danged close to someone watching from below.
    If the planes are using RNP navigation, they will show almost
    perfect tracks over the same routes being as the lateral error
    is so low.
    The Southwest jets I run on my sim are RNP equipped.
    The lateral navigation is so accurate that if I were to
    approach an airport using an RNP approach, I won't fly
    over the same neighborhood every time, I'll fly over the
    same houses in that neighborhood every time.
    Anyway, to my beady eyeballs, those are all aircraft, with
    a few meteors thrown in every once in a while.
    Naturally, the meteors don't run from horizon to horizon
    like the aircraft do, but fizzle out pretty fast.
    NM5K, Jan 28, 2012
  7. Cool! Thank you for the information.
    Paul in Houston TX, Jan 29, 2012
  8. Savageduck

    Ray Fischer Guest

    They're not meteor trails. Yosemite is under a major air corridor
    from the Bay Area to the East. Those are jet airliners. You can also
    see the contrails in several of the daytime shots (@2:19, e.g.)
    Ray Fischer, Feb 4, 2012
  9. Beautiful! Thanks.
    James Silverton, Feb 4, 2012
  10. Savageduck

    Mark F Guest

    The daytime shot around 2:19 are contrails - they disperse over time;
    the nighttime shots don't disperse and start within the field of view.
    Mark F, Feb 5, 2012
  11. Savageduck

    Savageduck Guest

    Look again.

    They are aircraft light trails, the air traffic over yosemite is quite
    dense, and moves on several different compass points. Over Yosemite
    there are reciprocal routes running SSW-NNE, SW-NE, NW-SE, E-W, with
    several hundred flights running around the clock. Then there are
    military flights running from Beale AFB, NAS Lemore in California,
    Nellis AFB, NAS Fallon in Nevada, and the USMC Mountain Warfare
    Training Center which lies about 37 miles due North of Yosemite Valley
    and flies VSTOL and helicopter operations in the area. All of these
    military bases fly missions taking them across, and around the Sierras
    in the area of Yosemite.
    Savageduck, Feb 5, 2012
  12. Savageduck

    Mark F Guest

    I stand corrected: I looked frame by frame (or as close to that as I
    could get) and it does look like the trails run completely across the
    field of view, meaning they are aircraft lights.
    Mark F, Feb 6, 2012
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