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基于MODIS数据的干旱区土壤水分反演

DOI: 10.6046/gtzyyg.2014.01.14, PP. 78-82

Keywords: 土壤水分,MODIS,热惯量,表观热惯量

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Abstract:

为了更好地研究内蒙古额济纳盆地的土壤水分时空分布及动态变化,基于MODIS数据,利用热惯量模型,计算了表观热惯量,并与实测数据进行回归分析建模,反演了内蒙古额济纳盆地的土壤水分。结果表明,利用MODIS数据产品,反演参量获取简单,可降低反演土壤含水量的复杂性,有利于大、中尺度的实际应用;砂土对应的表观热惯量均值较大,粘土次之,壤土最小;相比粘土,壤土和砂土的表观热惯量值比较大且分散;绿洲区表观热惯量值比戈壁和沙漠区大;热惯量模型在20cm左右深度土壤水分反演效果最好,可有效反演干旱区土壤水分。

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