• ES Picture of the Day 23 2020

    From Black Panther@21:1/186 to All on Mon Nov 23 11:00:46 2020
    EPOD - a service of USRA

    The Earth Science Picture of the Day (EPOD) highlights the diverse processes and phenomena which shape our planet and our lives. EPOD will collect and archive photos, imagery, graphics, and artwork with short explanatory
    captions and links exemplifying features within the Earth system. The
    community is invited to contribute digital imagery, short captions and
    relevant links.

    Seeing the Sky in Correct Proportions

    November 23, 2020

    Acool_image001 (6)
    Image003 (2)
    Photographer: Andrew Cool
    Summary Author: Andrew Cool

    As shown above at top, stars aren’t always crystal clear on all-sky
    or fisheye imagery. While software can be written to convert
    fisheye images to equirectilinear format ( altitude-azimuth
    system of coordinates), this results in unwanted distortion. To
    counteract this distortion, I’ve written new software to create a model
    3D Hemisphere, over which I drape the equirectilinear image so that
    a 180-degree sky map is mapped onto a hemisphere image. This
    essentially reverses the distortion and produces a 3D sky with crisp,
    pinprick stars (bottom image). With new software development, such as
    described here, it's now possible to see the sky as represented on
    fisheye photos in correct proportions. For me, all-sky dewarping
    efforts derive from my interest in measuring light pollution for
    the River Murray International Dark Sky Reserve in South Australia.
    * River Murray Dark Sky Reserve, Australia Coordinates:
    -34.66829, 139.27342

    Related EPODs

    Seeing the Sky in Correct Proportions The Noose of Mars in 2018
    STEVE Observed over Orsta, Norway Comet NEOWISE Mosaic Mars
    at Opposition The Red Planet Up Close

    Night Sky Links

    * Space Weather Live
    * Space Weather Live Forum
    * About the Moon
    * American Meteor Society
    * Arbeitskreises Meteore e.V.
    * Global City Lights
    * Heavens Above Home Page
    * The International Meteor Organization
    * Lunar and Planetary Institute
    * MoonConnection
    * NASA Eclipse Web Page
    * Understanding The Moon Phases

    Earth Science Picture of the Day is a service of the Universities
    Space Research Association.


    --- up 12 weeks, 6 days, 21 hours, 20 minutes
    * Origin: -=> Castle Rock BBS <=- Now Husky HPT Powered! (21:1/186)