Image Processing Reference
urban structures was calculated as 33.7 ha in difference between 1998 and 2002.
In this calculation the urban pixels surrounding marshland (in red, upper right
corner) were not included.
To evaluate the compatibility of the urban structures extracted from the IKONOS
NDVI image, the urban classes in Mimarsinan (urban & industry) obtained using
maximum likelihood classification of LANDSAT TM (1998) image (Fig. 15.7c )
were overlaid on the IKONOS NDVI (2002) image. Thus, the areal extent of the
urban growth in 2002 was compared with the LANDSAT TM classification result
(1998) revealing a difference of 28.3 ha in greenness between these two dates and
which can be attributed to a subtle trend towards an increase in urbanization espe-
cially in southern and eastern coastline of Mimarsinan.
As the earth's population increases, cities will continue to grow and spread.
However, this continual growth comes with a range of environmental drawbacks
which are typically magnified in developing countries. Rapid and haphazard
urban sprawl and increasing population pressure in megacities often infringes
upon agricultural and/or forest land. Analyzing agricultural and urban land use
is important for ensuring that development does not encroach on productive
agricultural land, and to likewise ensure that agriculture is occurring on the most
appropriate land and will not degrade due to improper adjacent development or
infrastructure. The multi-temporal multi-spectral analysis of satellite remote
sensing data facilitates this process of monitoring land use in both agricultural
and urban settings. In this study, in Büyükçekmece, in a sub-district of Istanbul
in Turkey located 50 km far from city centrum, parallel to the continuous popu-
lation growth (>40% in some regions) due to (i) intensive migration from the
other parts of Turkey, (ii) good transport network such as Trans-European
Motorway (TEM) which crosses Büyükçekmece, and (iii) natural population
growth, rapid urbanization over a period of 15 years has been detected. Also, a
decrease or total loss of agricultural fields in various sections of the region due
to the rapid increase of settlement areas (mainly mass housing) has been deter-
mined. Besides, industrialized areas, which did not exist in 1984 have been
extended due to good urban planning, convenient air, highway (TEM) and sea
connections in the district.
Today, for Büyükçekmece, all these would not be considered as a negative
condition due to the great areal extent (22,500 ha) of this sub-district and due to
the still existing uninhabited areas, which can still be used for construction of new
buildings. Thus, construction of the multi storey mass houses still continue rap-
idly. Nowadays, there are some suggestions regarding to applying visa for the city
Istanbul which will also include Büyükçekmece to prevent this intensive