Approach to Land-use Analysis in Hetao Irrigation Project of Inner Mongolia, China, Based on Satellite Image Data
Results and Discussion
Figs. 5 to 7 show the results of the supervised classifications 1 and 2 and unsupervised classification mentioned previously. Table 2 shows the areas (ha) of the respective classes in the results of classification in Figs. 5 to 7. Here, we discuss the most-likely classification method applied generally. In the area of about 247,000 ha in Linhe, 8,556 ha (3.46%) were classified into dune and 96,532 ha (39.1%) were classified into the saline soil; the area amounting to 42.56% is the land of dunes and saline soils not covered with vegetation.
Fig5 Supervised classisification1
Fig6 Supervised classisification2
Fig7 Unsupervised classification
Table2 Result of classification
| Method | Sand dune | Saline soil | Vegetation | Water | Urban | Others | Total |
| | (ha) | (ha) | (ha) | (ha) | (ha) | (ha) | (ha) |
| Supervised classification 1 | 8556 | 96532 | 111967 | 13763 | 3009 | 13135 | 246963 |
| Supervised classification 2 | 7218 | 97158 | 111884 | 13600 | 3642 | 13460 | 246963 |
| Unsupervised classification | 14458 | 92745 | 98986 | 8135 | 26602 | 6037 | 246963 |
Figs. 8 and 9 show the areas coinciding to both the result of extraction of dunes and the result of extraction of dunes and saline soils (including naked soils) from Figs. 5 and 6. Table 3 shows the results. Comparison of Tables 2 and 3 reveals decreases in dunes and saline soils. These are the results of extracting the areas common to Figs. 5 and 6.
