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    Currents...wrong data ??

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    • N
      nikonstantinou last edited by nikonstantinou

      Pls, be advised that the figures of currents in the specific location are wrong. If you interpolate the data in the area you have to reconsider that.

      Best Regards.

      0_1524124903083_7b99b80a-bc85-4a76-b1b7-4cfd48a0ac19-image.png

      0_1524124168382_1849f0ce-9252-4ac9-8e08-22f4e2d1917b-image.png

      Gkikas LGPZ TZ 3 Replies Last reply Reply Quote 0
      • Gkikas LGPZ
        Gkikas LGPZ Moderator @nikonstantinou last edited by

        @nikonstantinou
        Yes, it seems you are right. Over-interpolation is problematic.
        http://polar.ncep.noaa.gov/global/nc/?-indonesia-curr-000-small-rundate=latest
        Also ...
        I observed that the problem is bigger in the equator (locations A,B,C).
        Kuroshio current (east from Taiwan) seems to be OK.
        0_1524210594432_0e56b391-7e80-4efc-be22-3c8db1b27117-εικόνα.png

        1 Reply Last reply Reply Quote 0
        • Gkikas LGPZ
          Gkikas LGPZ Moderator @nikonstantinou last edited by

          @nikonstantinou
          Κύριε Κωνσταντίνου,
          ελπίζω οι διαχειριστές να διορθώσουν αυτή την ατέλεια.
          Σας εύχομαι "καλές θάλασσες"!

          1 Reply Last reply Reply Quote 0
          • TZ
            TZ Administrator @nikonstantinou last edited by TZ

            @nikonstantinou Hi, I checked it and these values are contained in the original data.
            We use the following source: "OSCAR third degree resolution ocean surface currents".
            Link: https://podaac.jpl.nasa.gov/dataset/OSCAR_L4_OC_third-deg
            It is analysis which is calculated once per 5 days. The actual one is from the 17th of April.
            Sea currents is not our major feature, but if you have a tip/link to better data, please share it and we will consider replacement of the data source (maybe there is available even forecast).

            Gkikas LGPZ 2 Replies Last reply Reply Quote 2
            • Gkikas LGPZ
              Gkikas LGPZ Moderator @TZ last edited by

              @tz
              @nikonstantinou
              I think we compare apples and oranges!
              Sea currents from OSCAR are calculated (mostly) from satellite real time data
              while NCEP/EMC/MMAB curents are forecast products calculated from NOAA's Global Ocean Model.
              https://podaac.jpl.nasa.gov/dataset/OSCAR_L4_OC_third-deg
              http://polar.ncep.noaa.gov/global/

              1 Reply Last reply Reply Quote 0
              • Gkikas LGPZ
                Gkikas LGPZ Moderator @TZ last edited by

                @tz
                Link to sea currents forecasts:
                http://polar.ncep.noaa.gov/global/nc/?-global-curr-000-small-rundate=latest

                Data access (in GRiB2) :
                http://polar.ncep.noaa.gov/global/data_access.shtml?

                1 Reply Last reply Reply Quote 0
                • jaffadog
                  jaffadog API developers last edited by

                  The OSCAR source data is provided in a 20NM grid and typically has gaps at coastlines and in shallow bank areas. @meteo-GR, I think you are right - that the interpolation in windy.com visualization is creating artifacts that are not supported by the source data. See the comparison below:

                  Raw data:
                  alt text

                  Windy.com:
                  alt text

                  The raw OSCAR data can be visualized here:
                  https://podaac-tools.jpl.nasa.gov/soto/#b=BlueMarble_ShadedRelief_Bathymetry&l=oscar_l4_oc_third_deg___oceancurrent_speed___1088_x_544___daynight(la=true,lo=0.55),oscar_l4_oc_third_deg___oceancurrent_dir_color(la=true)&ve=115.71814649149786,-1.8398349416397783,123.10095899149786,1.6977627146102217&pl=false&pb=false&d=2018-04-17&ao=false&as=2018-04-11&ae=2018-04-18&ass=1/day&afr=500&tlr=days

                  1 Reply Last reply Reply Quote 1
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