Medroplan Guidelines SPI Help File
Convert precipitation data into a text file (.txt) in 3 columns:
Year
Month
Precipitation (x10)
Save in a folder in C:/SPI
Your name file must not exceed 8 characters (E.g. 3408p.txt)
1940
1940
1940
1940
1940
1940
1940
1940
1940
1940
1940
1940
1941
1941
1941
1941
1941
1941
1941
1941
1941
1941
1941
1941
1942
1942
1942
1942
1942
1942
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
4
5
6
2963
4416
1501
1187
394
278
0
322
468
1711
1044
387
518
450
4648
622
634
692
56
47
506
38
1832
208
988
516
3642
1134
578
61
Open SPI software and determine:
-
Number of time scales: Number of aggregation periods desired for the
calculation (E.g. 3)
-
timeScale1, 2 and 3: duration of the 3 aggregation periods selected (E.g. 3, 12
and 24 months each). Just write the number
-
Input file: C:\SPI\yourfile.txt (your file name must not exceed 8 characters, e.g.
3408p.txt)
Output file: C:\SPI\yourfile.txt (your file name must not exceed 8 characters,
e.g. 3408s.txt). The txt obtained should look similar to the following one without
the column headings.
-
Year Month
1899
4
1899
5
1899
6
1899
7
1899
8
1899
9
1899
10
1899
11
1899
12
1900
1
1900
2
1900
3
1900
4
1900
5
1900
6
1900
7
1900
8
1900
9
1900
10
SPI 3
-99
-99
-99
-0.87
0.17
-0.16
0.7
0.39
0.31
0.23
-0.29
-0.14
-0.72
-0.35
-0.5
-0.59
-0.76
-0.07
-0.16
SPI 12
-99
-99
-99
-99
-99
-99
-99
-99
-99
-0.37
-0.2
-0.3
-0.2
-0.08
-0.18
-0.25
-0.73
-0.24
-0.75
SPI 24
-99
-99
-99
-99
-99
-99
-99
-99
-99
-99
-99
-99
-99
-99
-99
-99
-99
-99
-99
1900
1900
1901
1901
1901
1901
1901
1901
1901
1901
1901
1901
1901
1901
1902
1902
1902
11
12
1
2
3
4
5
6
7
8
9
10
11
12
1
2
3
-0.45
-1.11
-0.73
-1.08
-1
-0.12
0.3
0.72
0.63
0.64
-0.02
-0.26
0.15
-0.05
-0.48
0.58
0.7
-0.65
-1.27
-1
-1.36
-0.97
-0.32
-0.17
-0.26
-0.21
-0.55
-0.9
-0.33
0.23
0.41
-0.01
0.76
0.55
-99
-99
-1.12
-1.22
-0.98
-0.43
-0.24
-0.38
-0.38
-0.97
-0.88
-0.83
-0.35
-0.61
-0.82
-0.39
-0.3
With these results SPI graphs can be obtained in Excel defining the threshold level for
drought identification as the same value for the whole series (e.g. -2)
SPI a 3 meses. Est.3504. Hervas
3
2
1
-2
-3
-4
99
19
94
96
19
19
90
92
19
19
85
87
19
19
81
83
19
19
76
78
19
19
72
74
19
19
67
69
19
19
63
65
19
19
58
60
19
19
54
56
19
19
49
51
19
19
45
47
19
-1
19
19
19
40
42
0