Oh, that are very interesting data. Jacques Terrettaz schrieb am Montag, 13. Mai 2024 um 18:36:27 UTC+2:
Globally the data derived from the formula give a higher sunshine duration. We cannot expect to get the same values from that different measurement principles, I guess. Nevertheless, I find it useful to compare and to discuss about it. But I am not sure if your sunshine duration sensor is located at the same place or near the Davis radiation sensor . If it is not the case , any comparison will be useless ! No, it is not at same place. The Davis weather station (and with it the radiation sensor) is located at 2 meters above the ground, as the rules say. There is some shadow from a tree at about 15:00 o'clock in winter. The sunshine duration sensor is mounted on a mast at about 10 meters above the ground (near the wind sensor). No shadow is around there. You can "browse" your data here , with the "ticks" calculates bye the formula : http://meteo-sciez.fr/site/graph_frame_karen.php and by choosing the date of interest, and clicking at the legend of each series to show or hide . I will have a look at it. I guess, we should validate the measurements by checking sunshine manually at different points of the day and the sunshine condition. Actually the sky is blue, and no cloud is to be seen. So we have to wait for clouds to get some useful data. -- You received this message because you are subscribed to the Google Groups "weewx-user" group. To unsubscribe from this group and stop receiving emails from it, send an email to weewx-user+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/weewx-user/6444183f-adac-4e54-aba3-66f176ed9d52n%40googlegroups.com.
