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Author Topic: Norwich City Question - did the ship or shoreline move?  (Read 21090 times)

Monty Fowler

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Re: Norwich City Question
« Reply #15 on: June 05, 2012, 05:43:39 PM »

For what it's worth, the shoreline moving gets my vote.

And at the end of the day, well, it's only a picture. That and $5 will get you a cup of coffee in DC.

LTM,
Monty Fowler, TIGHAR No. 2189CER
Ex-TIGHAR member No. 2189 E C R SP, 1998-2016
 
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Tom Bryant

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Re: Norwich City Question
« Reply #16 on: June 10, 2012, 01:02:25 PM »

Before getting too excited I would want to have the photos orthocorrected. There is so much skew introduced in them that you cannot take a good measurement. This is especially true when dealing with dynamic elements like reef based features.
You would need to get some pics from as top down as you could get and then find non dynamic fiducial points to work from to flatten the image. When working with highly variable edges like shorelines the tide level, surf edges and wave action, erosion fronts, vegetation encroachment or withdrawal, and a host of other factors means if you were actively trying to get images to work with you would have to go inland or more likely have to place artificial fiducial points.
Given that the wreck was so far onto the reef and no longer buoyant - I would suspect that it was pretty solidly fixed.
On the other hand if you take the ship as a fixed point and plot changing shoreline against it you might get some ideas on potential debris trains or burial dynamics.
"Well... it seemed like a good idea at the time"
 
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Heath Smith

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Re: Norwich City Question
« Reply #17 on: June 10, 2012, 01:08:17 PM »


An interesting point to consider when it comes to analyzing the Bevington photo and the "Bevington Object" (aka Nessie), if only the position of the ship is static, and the shoreline is moving by perhaps as much as 300ft, shouldn't the ship be used as the single reference point assuming that it is the only object in the photo that didn't move?
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Tom Bryant

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Re: Norwich City Question
« Reply #18 on: June 10, 2012, 01:26:39 PM »

It would make for an interesting study for sure. There may be some photogrametric things that can be tried using the knowns on the ship size etc to get implied shoreline dynamics. Things like sand deposition and erosion. It isn't just the water levels that could be exposing and hiding artifacts. Cover a piece of landing gear with 2 feet of sand and to the visual search it may as well be invisible even when walking right over it. Two years later somebody glides over that same spot in their canoe and asks "Where the heck did THAT come from??!!"
"Well... it seemed like a good idea at the time"
 
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John Ousterhout

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Re: Norwich City Question
« Reply #19 on: June 10, 2012, 10:37:54 PM »

Shorelines are known to change a LOT, whereas reef edges change slowly.  Looking at the various aerial photos of Niku over the years, the tree line can be seen to change distance from the "beach".  Also, there is an easily observable change in vegitation at some distance from the beach, likely due to storms washing away the intermediate foliage, which also changes the observed shoreline.

I think the shoreline is a poor choice for reference.  The Norwich City location is a better reference, but may have changed heading.  The reef edge will also have changed, but slowly, as I understand.  We need an expert on the subject.
Cheers,
JohnO
 
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Doug Giese

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Re: Norwich City Question - did the ship or shoreline move?
« Reply #20 on: September 01, 2012, 06:19:18 PM »

Take a look at This post to see a dramatic shift in the Southern coastline.
------
Doug
 
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