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Author Topic: Abyssal Plain  (Read 425 times)

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Offline Truth is Eternal

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Abyssal Plain
« on: May 16, 2018, 04:49:59 PM »
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    An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3,000 metres (9,800 ft) and 6,000 metres (20,000 ft). Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains cover more than 50% of the Earth’s surface.[1][2] They are among the flattest, smoothest and least explored regions on Earth.[3] Abyssal plains are key geologic elements of oceanic basins (the other elements being an elevated mid-ocean ridge and flanking abyssal hills).
    https://en.wikipedia.org/wiki/Abyssal_plain

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    Offline happenby

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    Re: Abyssal Plain
    « Reply #1 on: May 19, 2018, 11:52:03 AM »
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  • https://en.wikipedia.org/wiki/Abyssal_plain


    Abyssal plains cover more than 50% of the Earth’s surface.[1][2] They are among the flattest, smoothest and least explored regions on Earth.[3]


    Excellent info TIE


    Offline happenby

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    Re: Abyssal Plain
    « Reply #2 on: May 19, 2018, 11:59:26 AM »
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  • Regarding the oceans, linked within the related content of the abyssal plain, is a link suggesting the ocean floor curves. And NASA's view. 



    Sadly, two of the links go nowhere, and the other is incomplete. 


    Globers clean up as they go, recreating the lie to fit.  Right now, they haven't got a plausible explanation for the flat sea floor. 

    Offline Neil Obstat

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    Re: Abyssal Plain
    « Reply #3 on: May 26, 2018, 01:11:02 PM »
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  • Regarding the oceans, linked within the related content of the abyssal plain, is a link suggesting the ocean floor curves. And NASA's view.  



    Sadly, two of the links go nowhere, and the other is incomplete.  


    Globers clean up as they go, recreating the lie to fit.  Right now, they haven't got a plausible explanation for the flat sea floor.
    .
    There are a multitude of pages on the Internet for past, present and future satellite programs, missions and operations.
    Here is a site with a long selection represented by thumbnail images you can click on:
    .
    https://science.nasa.gov/missions-page?field_division_tid=103&field_phase_tid=All
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    This one has a current downloadable image from a geosynchronous satellite view of the spherical earth:

    Source
    SPECIAL MESSAGE:
    This NOAA site will no longer provide GOES-East imagery. For access to high resolution GOES-East imagery from GOES-16, please go to the site: https://www.star.nesdis.noaa.gov/GOES/index.php. We apologize for the inconvenience and appreciate your patience.
    .
    https://www.star.nesdis.noaa.gov/GOES/index.php

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    The geosynchronous altitude, which is much higher than LEO of ISS, gives an angle of view that enables the entire earth to be viewable in one camera frame, however, it is not far enough away from earth to enable the satellite to see very close to the hemisphere line, to give a 180-degree coverage of the hemisphere in view. (IOW less than a full view of half the globe is seen at any time, but much more than can be seen from the LEO of the ISS for example.) So it will appear to cut off a small ring all around the perimeter of the image such that you won't be able to see Antarctica or much of the arctic ocean in the north. You can get an idea of this angle of view by looking at a 12" diameter globe model from a distance of 10 inches, or through a camera with a macro lens. You can only see about 41% of the surface, not 50%. Even from the moon a viewer would only see about 48% of the earth. The proportions of the continents won't look just right because a wide angle lens entails some inherent distortion. So in the image above, if viewed from further east over the Atlantic Ocean (where this satellite doesn't go anyway because it is always in the same position in the sky), South America would appear to the left and a bit smaller than it does here. Since this is a geosynchronous satellite, however, its position in the sky remains constant and so North and South America will appear in the same position at all hours. What would change in different time frames is the area lit by the sun, such that at sunrise from let's say Texas, the dark shadow of night will cover more of the left side than it does in this image, and later at sunset, the dark shadow will cover from Texas to the right, the Atlantic Ocean and western Africa.
    .

    Full Disk Infrared, Channel 4 Loop: GOES-West version  <---- See the above image in a 10-frame continuous loop.

    HAniS (HTML5 AnimationS), an HTML5-based animator for the web is Copyright© 2014-2017 by StormQuest Technologies and Tom Whittaker.

    Note:   Imagery and loops on this site are intended for informational purposes only, they are not considered "operational".  This web site should not be used to support operational observation, forecasting, emergency, or disaster mitigation operations, either public or private.  In addition, we do not provide weather forecasts on this site — that is the mission of the National Weather Service.  Please contact them for any forecast questions or issues.
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    Offline Neil Obstat

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    Re: Abyssal Plain
    « Reply #4 on: May 26, 2018, 01:52:45 PM »
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  • .
    The above images of earth contain large areas of the Pacific and Atlantic oceans, much of which are featureless vast abyssal plains.
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    When observed by any of the technological means available (they're too deep under water to be seen by eye), they appear flat in any immediate area of say less than 300 square nautical miles in area, something like the Bonneville salt flats.
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    In order to get an idea of what the earth's curvature looks like on an abyssal plain you have to consider a much larger area.
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    Take the area of the Pacific Ocean bounded by Hawaii on the north, and Tahiti and Easter Island on the south.
    That would be a 1-inch diameter circle in the middle of this picture:


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    That would have the area roughly equivalent to the area of the 48 contiguous States and Mexico combined, or 32 million square nautical miles.
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    That means an area 100,000 (one hundred thousand) times larger than the Bonneville salt flats.
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    To view such an area from above ground you would need to be higher up than LEO of the ISS.
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    But nonetheless, the abyssal plain it covers has no appreciable features to speak of.
    If you were on the ocean floor anywhere inside this area it would appear "flat" in all directions.
    But when viewed from above or anywhere outside the earth's curvature would be evident.
    Except for the fact that the water of the ocean would be in the way so you wouldn't be able to see the abyssal plain directly.
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