 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
    More...

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

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