Windy Community
    • Unread
    • Categories
    • Groups
    • Go to windy.com
    • Register
    • Login

    GFS temperature VS Weatheronline

    Bug Reports
    2
    15
    2.2k
    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.
    • Z
      zhaoy @idefix37 | Premium
      last edited by

      @idefix37 There are 38 color classifications in the temperature legend of Weatheronline,I have modified the color according to legend on Windy, but there are still differences between the two images. So I guess Windy's data may have been processed.
      069b8a07-1e3f-48e1-aa41-984294bc58d4-image.png

      idefix37I 1 Reply Last reply Reply Quote 0
      • idefix37I
        idefix37 Sailor Moderator @zhaoy
        last edited by

        @zhaoy
        Could you show your code.

        Z 1 Reply Last reply Reply Quote 0
        • Z
          zhaoy @idefix37 | Premium
          last edited by zhaoy

          @idefix37 I picked up steps with numerical values on color legend, and other steps were interpolated by numerical values
          [[245,[136,136,136,255]],[246.5,[176,176,176,255]],[248,[204,204,204,255]],[249.5,[228,228,228,255]],[251,[119,51,119,255]],[253.4,[170,51,170,255]],[255.8,[204,51,204,255]],[258.2,[255,51,255,255]],[260.6,[255,153,255,255]],[263,[21,0,204,255]],[265,[51,102,255,255]],[267,[51,153,255,255]],[269,[51,204,255,255]],[271,[51,255,255,255]],[273,[0,119,0,255]],[275.4,[0,153,0,255]],[277.8,[0,187,0,255]],[280.2,[0,221,0,255]],[282.6,[0,255,0,255]],[285,[255,255,51,255]],[286.75,[255,238,51,255]],[288.5,[255,221,51,255]],[290.25,[255,204,51,255]],[292,[255,187,51,255]],[293.75,[255,170,0,255]],[295.5,[255,153,0,255]],[297.25,[255,119,0,255]],[299,[255,0,0,255]],[301,[238,0,0,255]],[303,[204,0,0,255]],[305,[187,0,0,255]],[307,[170,0,0,255]],[309,[153,0,0,255]],[311,[136,0,0,255]],[313.5,[114,0,0,255]],[316,[91,0,0,255]],[318.5,[66,0,0,255]],[321,[29,0,0,255]]]

          idefix37I 1 Reply Last reply Reply Quote 0
          • idefix37I
            idefix37 Sailor Moderator @zhaoy
            last edited by idefix37

            @zhaoy
            Thank you.
            Could you try

            [[245,[136,136,136,255]],[247.9,[176,176,176,255]],[248,[204,204,204,255]],[250.9,[228,228,228,255]], [251,[119,51,119,255]], …etc

            It should improve the scale, but not sure you get exactly what you want.

            Z 1 Reply Last reply Reply Quote 0
            • Z
              zhaoy @idefix37 | Premium
              last edited by

              @idefix37 thank you! the result is not yet which I wanted,I think the same data source (GFS 0.25°) should render the same results,but the Weatheronline image has many small patches,and the boundary is quite sharp.
              WeatherOnline Result:
              b72829d3-5ee7-4021-9530-460ec2eabf15-image.png

              so,I guess Windy did some smoothing on the data, I don't know if it's appropriate.
              such as this picture
              4ee3e094-1cd8-46ce-9f5d-f21d881d3be8-image.png

              idefix37I 1 Reply Last reply Reply Quote 0
              • idefix37I
                idefix37 Sailor Moderator @zhaoy
                last edited by idefix37

                @zhaoy
                You are being picky. I find the granularity to be pretty good.
                At boundary between the value ranges the limit is jagged. Can you try taking a screenshot of the Icing layer of the same device.
                Then could you explain the 2 squares with numbers. How did you make them ?

                Z 1 Reply Last reply Reply Quote 0
                • Z
                  zhaoy | Premium
                  last edited by zhaoy

                  The temperature data(GFS 0.5°) render result on meteoblue,which also has many small patches,and the boundary is quite
                  https://www.meteoblue.com/en/weather/maps/#coords=5.65/37.766/99.822&map=temperature~hourly~GFS05~2 m above gnd~none

                  81ea7421-afcc-4397-b2d3-90c1d660f96a-image.png

                  1 Reply Last reply Reply Quote 0
                  • Z
                    zhaoy @idefix37 | Premium
                    last edited by

                    @idefix37 I'm just guessing if Windy smoothed the source data to make it look better

                    idefix37I 1 Reply Last reply Reply Quote 0
                    • idefix37I
                      idefix37 Sailor Moderator @zhaoy
                      last edited by idefix37

                      @zhaoy
                      I didn't realize you didn't apply the correct coding.

                      0309D9EB-32EC-4880-A2C3-C31569678643.jpeg

                      As already said, your coding should be like this theoretical diagram

                      97BA89E3-6C5F-4AD8-8D53-12FE10EC7482.jpeg

                      Z 1 Reply Last reply Reply Quote 0
                      • Z
                        zhaoy @idefix37 | Premium
                        last edited by

                        @idefix37 I guess it's not a color rendering issue, Did Windy lose a lot of details in smoothing the source data(GFS 0.25°)

                        [[245,[136,136,136,255]],[246.4,[136,136,136,255]],[246.5,[176,176,176,255]],[247.9,[176,176,176,255]],[248,[204,204,204,255]],[249.4,[204,204,204,255]],[249.5,[228,228,228,255]],[250.9,[228,228,228,255]],[251,[119,51,119,255]],[253.3,[119,51,119,255]],[253.4,[170,51,170,255]],[255.7,[170,51,170,255]],[255.8,[204,51,204,255]],[258.1,[204,51,204,255]],[258.2,[255,51,255,255]],[260.5,[255,51,255,255]],[260.6,[255,153,255,255]],[262.9,[255,153,255,255]],[263,[21,0,204,255]],[264.9,[21,0,204,255]],[265,[51,102,255,255]],[266.9,[51,102,255,255]],[267,[51,153,255,255]],[268.9,[51,153,255,255]],[269,[51,204,255,255]],[270.9,[51,204,255,255]],[271,[51,255,255,255]],[272.9,[51,255,255,255]],[273,[0,119,0,255]],[275.3,[0,119,0,255]],[275.4,[0,153,0,255]],[277.7,[0,153,0,255]],[277.8,[0,187,0,255]],[280.1,[0,187,0,255]],[280.2,[0,221,0,255]],[282.5,[0,221,0,255]],[282.6,[0,255,0,255]],[284.9,[0,255,0,255]],[285,[255,255,51,255]],[286.65,[255,255,51,255]],[286.75,[255,238,51,255]],[288.4,[255,238,51,255]],[288.5,[255,221,51,255]],[290.15,[255,221,51,255]],[290.25,[255,204,51,255]],[291.9,[255,204,51,255]],[292,[255,187,51,255]],[293.65,[255,187,51,255]],[293.75,[255,170,0,255]],[295.4,[255,170,0,255]],[295.5,[255,153,0,255]],[297.15,[255,153,0,255]],[297.25,[255,119,0,255]],[298.9,[255,119,0,255]],[299,[255,0,0,255]],[300.9,[255,0,0,255]],[301,[238,0,0,255]],[302.9,[238,0,0,255]],[303,[204,0,0,255]],[304.9,[204,0,0,255]],[305,[187,0,0,255]],[306.9,[187,0,0,255]],[307,[170,0,0,255]],[308.9,[170,0,0,255]],[309,[153,0,0,255]],[310.9,[153,0,0,255]],[311,[136,0,0,255]],[313.4,[136,0,0,255]],[313.5,[114,0,0,255]],[315.9,[114,0,0,255]],[316,[91,0,0,255]],[318.4,[91,0,0,255]],[318.5,[66,0,0,255]],[320.9,[66,0,0,255]],[321,[29,0,0,255]]]

                        Windy (GFS 0.25°):
                        cd7deff2-9664-424a-acd1-9caa5ff2d2fc-image.png

                        Meteoblue (GFS 0.5°):
                        9f875cfe-b173-4213-b8df-f234db48a6e6-image.png

                        WeatherOnline (GFS 0.25°):
                        1bf39bd8-cb58-47dd-b151-abbd5c25f554-image.png

                        idefix37I 1 Reply Last reply Reply Quote 0
                        • idefix37I
                          idefix37 Sailor Moderator @zhaoy
                          last edited by

                          @zhaoy
                          You already posted the same screenshots.
                          You can guess what you want.
                          End

                          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 of Use     Privacy Policy