Geography Reference
In-Depth Information
Table 6.3 The areas rates of the three wide existing general classes and the various agriculture
features based on the irrigated areas level
1975
1987
2005
2007
Cultivated
areas
249,681
301,517
458,288
596,612
Trees ? shrubs
2,137
26,148
27,206
Herbaceous
(permanent- and
winter-crops)
163,402
162,211
262,294
Alfalfa
23,608
Vetch
2,328
Wheat
53,013
131,881
188,688
Barley
4,902
19,423
16,299
Sugar beet
2,349
7,683
1,803
Rain-fed crops
37,707
Other crops
39,495
3,224
55,504
Fallow
135,978
269,929
307,112
Herbaceous
(summer-crops)
111,968
183,334
126,207
Cotton
67,881
136,392
37,475
Corn
33,519
31,198
25,481
Other crops
10,568
15,744
63,251
Fallow
189,549
274,954
470,405
Cropped_total
301,517
371,693
415,707
Uncultivated
areas
673,992
607,925
430,129
294,633
Water
52,030
65,980
87,284
84,347
between irrigated barely and the rest of the rain-fed crops is good to some extent
(1.83).
There was difficulty in the separation between the light fallow lands (as the
training samples were selecting on purely fallow areas) and the uncultivated areas,
including the artificial surfaces within the irrigation areas, to build the mask that
represents the cultivated areas, under which the classification was carried out for
agriculture features. To overcome this, the merging of training samples of both
fallow and cropped areas offered better results in separation.
The differentiation in the spectral response of the winter crops (and the varia-
tion within each type) was limited by the early periods of vegetative germination
of crops (March), which increased continuously until they reached their peak/s
during April and early May, and then began to decline and disappear.
LANDSAT-TM-August-1987 data (Fig. 6.7 ). The problem of spectral corre-
lation and separation between the uncultivated areas and the fallow was raised
whether using remotely sensed data of May or August. It was, in general, less
effective in August-data, where the separability reached 1.85, and where the most
correlation was seen within the artificial surfaces. Here the question was raised
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