How to calculate the hourly radiation: Difference between revisions
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''"De globale straling van het KNMI station is een som van het afgelopen uur. Om de hoeveelheid straling op het hele uur te schatten wordt de straling van het komende uur en afgelopen uur gemiddeld."'' | ''"De globale straling van het KNMI station is een som van het afgelopen uur. Om de hoeveelheid straling op het hele uur te schatten wordt de straling van het komende uur en afgelopen uur gemiddeld."'' | ||
So the [[Hourly_radiation_(Heat_Overlay)|global radiation for the hour]] has to be calculated as the average of the past hour and the next hour. | So the [[Hourly_radiation_(Heat_Overlay)|global radiation for the hour]] has to be calculated as the average of the past hour and the next hour. We use the ''Q'' column from the [[KNMI weather data]] for this. Additionally, the global radiation is in J / cm<sup>2</sup> and has to be converted to W / m<sup>2</sup> by multiplying: | ||
Additionally, the global radiation is in J / cm<sup>2</sup> and has to be converted to W / m<sup>2</sup> by multiplying: | |||
<math>radiation_{hourly} = \frac{Q_{t}+Q_{t+1}}{2} \cdot \frac{10000}{3600}</math> | <math>radiation_{hourly} = \frac{Q_{t}+Q_{t+1}}{2} \cdot \frac{10000}{3600}</math> | ||
[[File:Tutorial_hourly_radiation_table_(Heat_Overlay).png]] | [[File:Tutorial_hourly_radiation_table_(Heat_Overlay).png]] | ||
{| class="wikitable" | |||
! Column | |||
! Name | |||
! Unit | |||
! Dutch Description | |||
|- | |||
|13/L | |||
|Q | |||
|J/cm2 | |||
|''Globale straling (in J/cm2) per uurvak;'' | |||
|} | |||
{{article end | {{article end | ||
|notes= | |notes= | ||
* The values at each hour regard the measurement over the preceding hour up to that time. To obtain the value for 10:00 UTC, the values at 10:00 UTC and 11:00 UTC must be used. | |||
|seealso= | |seealso= | ||
* [[Hourly radiation (Heat Overlay)]] | |||
* [[KNMI weather data]] | * [[KNMI weather data]] | ||
}} | }} | ||
[[Category:How-to's]] | |||
Latest revision as of 08:26, 5 February 2024
According to the DPRA Heat stress report:
"De globale straling van het KNMI station is een som van het afgelopen uur. Om de hoeveelheid straling op het hele uur te schatten wordt de straling van het komende uur en afgelopen uur gemiddeld."
So the global radiation for the hour has to be calculated as the average of the past hour and the next hour. We use the Q column from the KNMI weather data for this. Additionally, the global radiation is in J / cm2 and has to be converted to W / m2 by multiplying:
.png)
| Column | Name | Unit | Dutch Description |
|---|---|---|---|
| 13/L | Q | J/cm2 | Globale straling (in J/cm2) per uurvak; |
Notes
- The values at each hour regard the measurement over the preceding hour up to that time. To obtain the value for 10:00 UTC, the values at 10:00 UTC and 11:00 UTC must be used.