Image Processing Reference
In-Depth Information
Table 15.5
LANDSAT TM image classiication accuracy analysis
1984
a
Ground truth data (%)
Forest
Class
Settlement
Stone quarry
Field
Lake + sea
Total
Forest
100.0
0.00
0.00
31.33
0.00
12.28
Settlement
0.00
87.74
0.00
0.00
0.00
6.60
Stone quarry
0.00
12.26
100.0
13.67
1.55
12.35
Field
0.00
0.00
0.00
55.00
0.00
11.45
Lake + sea
0.00
0.00
0.00
0.00
98.45
57.32
Total
100.0
100.0
100.0
100.0
100.0
100.0
1998
b
Ground truth data (%)
Stone
quarry
Class
Forest
Settlement
Industry
Field
Lake + sea
Total
Forest
76.00
0.00
0.00
0.00
0.00
0.00
1.67
Settlement
0.00
97.17
13.85
43.90
0.00
0.00
32.43
Stone quarry
0.00
0.00
21.54
0.00
0.00
0.00
1.23
Industry
0.00
2.83
64.62
56.10
0.00
0.00
6.57
Field
24.00
0.00
0.00
0.00
100.00
0.00
19.89
Lake + sea
0.00
0.00
0.00
0.00
0.00
100.00
38.21
Total
100.0
100.0
100.0
100.00
100.0
100.00
100.00
a
Kappa coefficient: 0.8201; overall accuracy: 88.8%
b
Kappa coefficient: 0.8953; overall accuracy: 92.5%
sub-districts Esenyurt (1,252.3 ha, 40.4%), Yakuplu (507.8 ha, 35.2%), Mimarsinan
(259.4 ha, 31.1%), Kıraç (293.7 ha, 33.2%) and Kavaklı (306.6 ha, 31.1%), most
of which are located on the eastern side of Bütyükçekmece Lake. An opposing
trend could be observed in the settlements of Ahmediye and Karaağaç, where the
built area in each district increased only by about 1%, which corresponds to a
total area of less than 100 ha. Analysis of the land classified as “field” in
Büyükçekmece revealed a loss of 26.4% of agricultural fields over the period of
14 years. The areas with maximum loss of fields were again located on the east-
ern side of Büyükçekmece Lake: Esenyurt (1,340.4 ha, 43.3%), Yakuplu (612.5
ha, 42.4%), Kıraç (349 ha, 39.4%), and Kavaklı (328.1 ha, 33.2%). Apparently,
there is a correlation between the loss of fields and the increase in settlement
areas (Fig.
15.6
).
As for fame lands, it is evident from the analysis that villas and new apartment
houses in Büyükçekmece rapidly depleted agricultural lands, an observation sup-
ported by ground truth data. Using the same analytical methods, it was found that
Ahmediye experienced a 49% loss of fields but only a 1% increase of settlements.
Interpreting the two different years of LANDSAT TM images, one can easily detect
that a significant portion of land in Ahmediye had been submerged by the water of
the Büyükçekmece Lake over the study period. The reason for this interesting event
is the enlargement of the Büyükçekmece Lake from a lagoon to a lake following
