230
E. Iwasaki et al.
Fig. 7 Percentage of land
use classes in 2003. Source
See Table 2
2%
50%
5%
40%
3%
Built-up land
Agricultural land
Sand dunes
Desert
Water bodies
As a result of the expansion of the built-up and agricultural lands, the desert area
decreased in average −25.2 ha per year.
Although the increased ratio of the built-up land was higher than that of agricultural land (1,386.4 and 3% respectively), the annual increase rate of agricultural land
was higher than that of built-up land (8.1 and 2.2 ha/year respectively).
4.8 Land Use Change Detection from 1988 to 2003
Built-up land increased in average 1.3 ha per year during 1988–2003. This ratio is
lower than during 1968–1988. On the other hand, the agricultural land increased
40.0 ha per year. This ratio is higher than during 1968–1988.
As the built-up and agricultural lands increased, the desert decreased in average
31.4 ha per year (by 471 ha). In addition, sand dune decreased in average 15.3 ha
during this year. This loss of desert land and sand dune on one hand and the expansion
of agricultural land on the other hand took place in higher pace than during 2003–
2018. Therefore, it can be pointed out that the land use change mainly of the expansion
of agricultural land at the expense of desert land and sand dune took place in the
highest pace during 1988–2003.
In this period, the conversion of agricultural land at the expense of the desert was
estimated to be 502.2 ha of desert land. This conversion of agricultural land occurred
in the southern part of the study area as shown in Fig. 11.
The built-up area also expanded at the expense of the desert by 8.9 ha. Some bad
indicators were found during this period, such as conversion of some agricultural
lands to either built-up areas or sand dunes with 7.6 and 0.5 ha. respectively.
Interestingly, the water bodies (drainage pond/lakes) increased 5.4 ha every year
during this period. It can be pointed out that the conversion of desert land to
agricultural land is accompanied by the expansion of water bodies.
E. Iwasaki et al.
Fig. 7 Percentage of land
use classes in 2003. Source
See Table 2
2%
50%
5%
40%
3%
Built-up land
Agricultural land
Sand dunes
Desert
Water bodies
As a result of the expansion of the built-up and agricultural lands, the desert area
decreased in average −25.2 ha per year.
Although the increased ratio of the built-up land was higher than that of agricultural land (1,386.4 and 3% respectively), the annual increase rate of agricultural land
was higher than that of built-up land (8.1 and 2.2 ha/year respectively).
4.8 Land Use Change Detection from 1988 to 2003
Built-up land increased in average 1.3 ha per year during 1988–2003. This ratio is
lower than during 1968–1988. On the other hand, the agricultural land increased
40.0 ha per year. This ratio is higher than during 1968–1988.
As the built-up and agricultural lands increased, the desert decreased in average
31.4 ha per year (by 471 ha). In addition, sand dune decreased in average 15.3 ha
during this year. This loss of desert land and sand dune on one hand and the expansion
of agricultural land on the other hand took place in higher pace than during 2003–
2018. Therefore, it can be pointed out that the land use change mainly of the expansion
of agricultural land at the expense of desert land and sand dune took place in the
highest pace during 1988–2003.
In this period, the conversion of agricultural land at the expense of the desert was
estimated to be 502.2 ha of desert land. This conversion of agricultural land occurred
in the southern part of the study area as shown in Fig. 11.
The built-up area also expanded at the expense of the desert by 8.9 ha. Some bad
indicators were found during this period, such as conversion of some agricultural
lands to either built-up areas or sand dunes with 7.6 and 0.5 ha. respectively.
Interestingly, the water bodies (drainage pond/lakes) increased 5.4 ha every year
during this period. It can be pointed out that the conversion of desert land to
agricultural land is accompanied by the expansion of water bodies.