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QC1-7 DETECTION OF COLLECTED VALUES FOR SEPARATION
Gabriel Kielland
In the extended use and presentation of some observations there is a need to infere a simulated observation taken to cover a shorter time span than the one observed.
In Kvalobs the separation procedure will be implemented for precipitation, maximum temperature and minimum temperature.
The Kvalobs parameters are:
- RR_X - Amount of precipitation which has fallen during a period preceding the standard time of observation;
- TAX_X - Temperature in degrees C, maximum one minute value during a period preceding the standard time of observation;
- TAN_X - Temperature in degrees C, minimum one minute value during a period preceding the standard time of observation.
The parameter values RR_X, TAX_X and TAN_X will be entered in the database together with values to indicate commencement and ending of the period. The time parameters are:
- KLSTART - Time of phenomenon commencement, 12 digits YYYYMMDDHHmm (“measurement from”)
- KLOBS - Time of phenomenon ending, 12 digits YYYYMMDDHHmm (“measurement untill”)
The following flag values are available:
| fd=0 | Not considered as collected value |
| fd=1 | Normal observation, not collected value |
| fd=2 | The original value is a collected value not separated |
| fd=3 | Abnormal observation. The original value may be a collected value |
The rules for applying the flag values is the following:
“measurement from” minus “measurement untill” < 23 hours ⇒ fd=3
“measurement from” minus “measurement untill” >= 23 hours og
“measurement from” minus “measurement untill” ⇐ 25 hours ⇒ fd=1
“measurement from” minus “measurement untill” > 25 hours og
“measurement from” minus “measurement untill” < 47 hours ⇒ fd=3
“measurement from” minus “measurement untill” >= 47 hours og
“measurement from” minus “measurement untill” ⇐ 73 hours ⇒ fd=2
“measurement from” minus “ measurement untill” > 73 hours ⇒ fd=3
Note that whenever KLOBS or KLSTART is a non valid time indication the observationen is flagged with fd=3.
Also with KLOBS or KLSTART missing the observation is flagged with fd=3.
Automatic separation of precipitation amount
The separation algorithms is to be implemented with QC2. The observation stored as an RR_X parameter will then be translated into one or several RR_24 values. The observed value will be placed in the field data.original and the separated partial value will be placed in the field data.corrected.
Last modified: Fri Dec 31 12:47:00 GMT 2004