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Thread: Strange Symbol - Alaskan Lake discussion

  1. #1
    Administrator GEHFileBot's Avatar
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    Default Strange Symbol - Alaskan Lake discussion

    This is a discussion thread for the following file:

    Strange Symbol - Alaskan Lake

    Strange Red & Black Symbol in an Alaskan forest. Strange overlap of map segments as well.


  2. #2
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    These are called fiducial marks, and are (in some older processes) used as part of the orthorectification process to warp the image onto the surface of the earth. This and the poor overlap are signs of sloppy work.

  3. #3
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    Cool Strange mark

    Quote Originally Posted by Jason Birch
    These are called fiducial marks, and are (in some older processes) used as part of the orthorectification process to warp the image onto the surface of the earth. This and the poor overlap are signs of sloppy work.

    Thank you. It seems you learn something everyday.

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    You can see them as well here:

    http://www.googleearthhacks.com/dlfi...rd-Map-Cut.htm

    just have a closer look to the cutting edge

  5. #5
    ṨῤἵḋểṙẊƻƻ SpiderX22's Avatar
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    Default targeting lock

    looks alot like half of somekind of targeting for a fighter jet

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    I was going to make a remark about headshots, but they are indeed meant to get the map texture on the earth frame

  7. #7
    Senior Member Felippo's Avatar
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    I agree with Jason Birch.
    In the attachment you can see a part of the edge of a 50 MB satellite image with a similar fiducial mark.

    Felippo
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