13.3.2.2 Sun Angle
In order to avoid the inverse effects of shadow for land cover determination, the sun
angle should be more than 27
. The following map shows the regions, and the table
shows the number of days in which the sun angle is above 27
(Table 13.3)
(Fig. 13.8).
Table 13.3 Number of days of sun angle above 27
in Turkey
Region
Sun angle !27 degrees
March
April
May
June
July
Aug
Sep
Oct
Nov
1
6
8
8
9
9
8
6
6
4
2
6
8
8
8
8
8
7
5
3
3
6
7
9
9
9
8
7
5
3
4
7
7
8
8
8
7
7
5
4
5
6
8
8
8
8
8
6
5
3
6
6
7
8
9
9
8
6
5
2
7
6
8
8
8
8
8
7
5
3
8
6
7
8
8
8
8
7
5
3
9
6
7
8
9
9
7
7
5
2
10
6
8
8
8
8
8
6
5
3
11
6
7
8
9
9
8
6
4
2
12
6
8
8
8
8
8
6
5
2
13
6
7
8
8
8
8
7
5
2
14
5
7
8
9
9
7
6
4
2
15
6
7
8
9
8
8
6
4
2
Fig. 13.8 (a) Sun angle illustration. (b) Sunlight classification regions (Table 13.3)
250
H. Erden and M. Aslan