Navigation

    Windy Community

    • Register
    • Login
    • Search
    • Unread
    • Categories
    • Groups
    • Go to windy.com

    Feature request: Global Sun Elevation Isolines

    Your Feedback and Suggestions
    2
    4
    726
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • T
      torianus last edited by

      The layer of Sun Elevation Isolines would help to interpret current temperatures in relation to the position of the sun in the sky.
      In the link below I provide a picture with the example:
      https://drive.google.com/file/d/1pf-VtOLIstrhQiZGxXO_c-VyFJQrKrF1/view?usp=sharing
      The owner of the picture is www.jgiesen.de

      Thanks for your attention.

      idefix37 1 Reply Last reply Reply Quote 2
      • idefix37
        idefix37 Sailor Moderator @torianus last edited by

        @torianus
        At least an overlay (as option) showing the limit of night and day should be nice. As already requested by @MetallicPoison
        https://community.windy.com/topic/6044/day-night-overlay

        It would give an image looking to
        https://www.star.nesdis.noaa.gov/GOES/GOES16_CONUS_Band.php?band=GEOCOLOR&length=48

        Of course adding isolines of sun elevation would be even better.

        1 Reply Last reply Reply Quote 1
        • T
          torianus last edited by

          @idefix37
          There are some examples of real-time maps:
          https://www.timeanddate.com/worldclock/sunearth.html?iso=20180706T1620
          or
          http://www.spacew.com/www/zenith.html

          But I don't know what algorithms they use for drawing those contours.
          I would use the Sun Position Algorithm and A General Algorithm For The Construction Of Contour Plots developed By NASA.
          1.https://rredc.nrel.gov/solar/codesandalgorithms/spa/
          2. http://www.pdas.com/conplot.html
          Could be that some coordinate transformation applies to the result of the SPA algorithm before feeding it to the contour plotting.

          Ciao guys

          1 Reply Last reply Reply Quote 2
          • T
            torianus last edited by torianus

            One more thing.
            The equations in the SPA algorithm are of trigonometric nature, therefore it shouldn't be that hard to solve them when Elev.Angle=Const. Thus you get a contour function.Then after applying a coordinate transformation you end up with a compact mathematical function which subsequently can be expressed in the Javascript language.

            1 Reply Last reply Reply Quote 0
            • First post
              Last post
            Windyty, S.E. - all rights reserved. Powered by excellent NodeBB
            NodeBB & contributors, OSM & contributors, HERE maps
            Terms and Conditions     Privacy Policy