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Data Data format for 223 daily time series for the territory of CIS

Data format for 223 daily time series for the territory of CIS

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The data set contains 223 data files in ASCII format named as IIIIII.dat,where IIIII is the synoptic index of a station (WMO index).

 

Data files contain fixed-length records, 54 bytes, with the line end character. Each record contains 14 fields with a fixed position in the record and a fixed length (see Table 1). Besides, all the fields in the record are separated from each other by character “blank”.

This “dual” record formatting makes it possible to use any of the most common ways of field separation (“comma separate” or “fixed length fields”) in performing data entry into the storage software environment (DBMS), electronic tabular processors, statistical packets and graphical data representation tools.

Records in data files are arranged by increasing key elements:  year, month, day.

The record format is described below, in Table 1.

Table 1

Record format of the data files

Field number

Position

Field length

Field name

Notes

1

1-5

5

WMO index of station

Fixed for the file

 

6

1

Blank

 

2

7-10

4

Year

 
 

11

 

Blank

 

3

12-13

2

Month

 
 

14

1

Blank

 

4

15-16

2

Day

 
 

17

1

Blank

 

 

5

18

1

TFLAG – group quality flag for air temperature indices

 

See Table 2

 

19

1

Blank

 

6

20-24

5

TMIN-minimum daily air temperature

In 0C, accurate within
0.10C

 

25

1

Blank

 

7

26

1

QTMIN- quality flag for TMIN

See Table 3

 

27

1

Blank

 

8

28-32

5

TMEAN – mean daily air temperature

In 0C, accurate within
0.10C

 

33

1

Blank

 

9

34

1

QTMEAN – quality flag for TMEAN

See Table 3

 

35

1

Blank

 

10

36-40

5

TMAX – maximum daily air temperature

In 0C, accurate within
0.10C

 

41

1

Blank

 

11

42

1

QTMAX – quality flag for TMAX

See Table 3

 

43

1

Blank

 

12

44-48

5

R – daily total precipitation

In mm accurate within
0.1 mm

 

49

1

Blank

 

13

50

1

CR - additional flag to R

See Table 4

 

51

1

Blank

 

14

52

1

QR - quality flag for R

See Table 3

 

53-54

2

Line end character ‘\n’

 

A fragment of the data file is given below:

20674 2001 12 27 0 -23.2 0 -19.7 0 -17.3 0   8.0 0 0  
20674 2001 12 28 0 -26.5 0 -25.1 0 -23.2 0 1.0 0 0
20674 2001 12 29 0 -32.5 0 -30.3 0 -26.4 0 0.0 2 0
20674 2001 12 30 0 -35.3 0 -34.3 0 -32.0 0 0.0 2 0
20674 2001 12 31 0 -35.1 0 -33.3 0 -31.5 0 0.0 2 0
--------------------------------------- --------- ----
RECORD KEY | AIR TEMPERATURE DATA | PRECIPITATION AMOUNT
--------------------------------------- --------------

TFLAG, a group quality flag for air temperature indices, is included in the record to keep users aware of erroneous data in the archives that were used in creating a data set. Efforts are being made to remove erroneous values, despite the great time consumption required to refer to initial observation materials (KM-1 books at meteorological stations).

Table 2

TFLAG (group quality flag for air temperature characteristics)values

TFLAG

Situation coded

QTMIN

QTMEAN

QTMAX

Conditions

 

 

 

0

0

9

9

 

No conditions

9

0

9

9

9

0

0

0

9

TMIN < TMEAN

0

9

0

TMIN < TMAX

9

0

0

TMEAN < TMAX

0

0

0

TMIN < TMEAN < TMAX

 

 

1

0

0

9

If at least one of the following relations is violated: TMIN < TMEAN
TMEAN < TMAX
TMIN < TMAX

0

9

0

9

0

0

0

0

0

9

9

9

9

-

 

 

Table 3

QTMIN, QTMEAN, QTMAX, and QR values

Q- flags

Values of Q-flags

0

The value is reliable

9

The value is rejected or no observations were made.

 

Table 4

CR values

CR

 

0

Measured precipitation amount equal to or higher than 0.1 mm

1

Precipitation measured for a few days

2

Precipitation measurements were made, but no precipitation occurred (R = 0)

3

Only precipitation traces were observed (< 0.1 mm)

R = 0

9

The value is rejected or no observations were made.