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本文通过运用ASTER遥感影像数据,对不同地物进行光谱分析,根据不同地物在不同波段的光谱特征曲线,分别提取植被和水体信息,然后进行非监督分类。并结合物探试验和土样分析结果,进行聚类分析,定性和定量的评价了焉耆盆地内土壤盐渍化程度分布状况。评价结果为:在焉耆盆地的平原区内,非盐渍化土壤,457.65km2;轻度盐渍化土壤,335.61 km2;中度~重度盐渍化土壤,580.93 km2;盐土,41.11 km2。根据野外实际调查,评价结果的精度达到了85%以上。
In this paper, we use ASTER remote sensing image data to do spectral analysis on different ground objects. According to the spectral characteristic curves of different ground objects in different bands, we extract vegetation and water information separately and then do unsupervised classification. Combined with the results of geophysical test and soil sample analysis, cluster analysis was conducted to evaluate the distribution of soil salinization in Yanqi Basin qualitatively and quantitatively. The evaluation results are as follows: In the plain area of Yanqi Basin, non-saline soil, 457.65km2; mild salinized soil, 335.61 km2; moderate to severe salinized soil, 580.93 km2; saline soil, 41.11 km2. According to the actual field investigation, the accuracy of the evaluation results reached more than 85%.