How to calculate the hourly radiation: Difference between revisions

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===Hourly radiation===
According to the {{Template:Heat_DPRA_Report}}:
According to the {{Template:Heat_DPRA_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."''
  ''"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>
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[[File:Tutorial_hourly_radiation_table_(Heat_Overlay).png]]
[[File:Tutorial_hourly_radiation_table_(Heat_Overlay).png]]


==Also see==
{| class="wikitable"
For more information on the KNIM historical weather data table and how to download this information please go to the [[Tutorial dutch model attributes (Heat Overlay)]]
! Column
! Name
! Unit
! Dutch Description
|-
|13/L
|Q
|J/cm2
|''Globale straling (in J/cm2) per uurvak;''
|}


{{Template:Heat_Module_buttons}}
{{article end
|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=
* [[Hourly radiation (Heat Overlay)]]
* [[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:

Tutorial hourly radiation table (Heat Overlay).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.

See also

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