ASTER遥感影像数据在土壤盐渍化评价中的应用

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.

Application of ASTER image to soil salinization assessment

In this paper, ASTER image was used to analyze the spectral characteristics of different ground objects. According to the spectral characteristic curves of different ground objects in different bands, the information on plants and water bodies were picked up, and unsupervised classification was carried out. Based on the results of geophysical tests and soil samples analysis, contiguity analysis was also undertaken. Finally, the soil salinization grade and distribution were assessed qualitatively and quantitatively in the Yanqi Basin. The assessment results show that, in the plain of the Yanqi Basin, the non-salinazation soil area is 457.65 km^2, low-grade salinization soil area is 335.61 km2 , middle to heavy-grade salinization soil area is 580.93 m^2 , salt soil area is 41.11 km^2 . Compared to the results of field investigation, the assessment precision was more than 85 % .