LSI LASTEM Alpha-Log - Penman-Monteith Evapo-Transpiration Elaborated Data Files

Alpha-Log – User manual
LSI LASTEM SRL
INSTUM_03388
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2017-10-20T12:11:00; 17110023; 45.4558; 9.3919; 108; 17110023; Settala; 3600; 25.00
2017-10-20T12:12:00; 17110023; 45.4558; 9.3919; 108; 17110023; Settala; 3600; 25.00
2017-10-20T12:13:00; 17110023; 45.4558; 9.3919; 108; 17110023; Settala; 3600; 24.90
2017-10-20T12:14:00; 17110023; 45.4558; 9.3919; 108; 17110023; Settala; 3600; 24.98
2017-10-20T12:15:00; 17110023; 45.4558; 9.3919; 108; 17110023; Settala; 3600; 24.82
2017-10-20T12:16:00; 17110023; 45.4558; 9.3919; 108; 17110023; Settala; 3600; 24.87
2017-10-20T12:17:00; 17110023; 45.4558; 9.3919; 108; 17110023; Settala; 3600; 24.76
2017-10-20T12:18:00; 17110023; 45.4558; 9.3919; 108; 17110023; Settala; 3600; 24.89
2017-10-20T12:19:00; 17110023; 45.4558; 9.3919; 108; 17110023; Settala; 3600; 24.99
2017-10-20T12:20:00; 17110023; 45.4558; 9.3919; 108; 17110023; Settala; 3600; 24.86
Fig. 38 – Processed data files example
Referring to the HEADER section in Fig. 37, the meaning of each value is obtained:
Datetime
Serial
Latitude
Longitude
Altitude
UserSerial
SiteName
TimeZone
Temperature
Ave ('C)
2017-10-20
T12:11:00
17110023
45.4558
9.3919
108
17110023
Settala
3600
25.00
4.2.6 Penman-Monteith evapo-transpiration elaborated data files
The result of evapo-transpiration calculations according to Penman-Monteith (§4.2.3.4) are contained in text
files (*.txt) identified as follows:
Name: penman_yyyy
1
MM
1
dd
1
hh
1
mm
1
ss
1
_yyyy
2
MM
2
dd
2
Example: penman_2020122000124_20201222.txt
The name shall contain the following information:
penman
File identification prefix containing evapo-transpiration computations
according to the Penman-Monteith algorithm
yyyy
1
MM
1
dd
1
hh
1
mm
1
ss
1
File creation date/time (in the example: 20/12/2020 00:01:24)
yyyy
2
MM
2
dd
2
Date referenced by the data contained (in the example: 20/12/2020)
The file is created by Alpha-Log once a day as soon as all the data needed for the calculation is available.
Normally this happens shortly after 0:00, or even later, depending on the operating conditions of the data
logger (power mode, low battery, etc.).
The file contains two lines. The first line has a descriptive character; the second one has the actual values.
The information contained is:
- PenmanValue: Penman-Monteith index value (main result).
- MinTair: minimum air temperature value.
- SiteElev: elevation above sea level.
- MaxTair: maximum value of air temperature.
- MinRH: minimum relative humidity value.
- UseTAvgForEA: flag indicating whether the average temperature has been used for the calculation.
- Id: unique id of the calculation.
- Timestamp: date/time of data production.