| 霍艾迪,康相武,张广军,李薇.基于MODIS数据的毛乌素沙地土壤水分模型的建立[J].干旱地区农业研究,2010,28(4):19~23 |
| 基于MODIS数据的毛乌素沙地土壤水分模型的建立 |
| Study on soil moisture model in Mu Us desert using MODIS image |
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| DOI：10.7606/j.issn.1000-7601.2010.04.04 |
| 中文关键词: MODIS 土壤湿度 TVDI |
| 英文关键词:MODIS Band 7 soil moisture temperature vegetation drought index(TVDI) |
| 基金项目:科技部科研院所社会公益研究项目(2005DIA3J006) |
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| 中文摘要: |
| 采用MODIS数据,根据水的吸收率曲线提出使用MODIS影像数据的第6波段和第7波段的反射率来监测土壤湿度,并与温度植被旱情指数(Temperature Vegetation Dryness Index,TVDI)进行对比。通过在毛乌素沙地沙漠化地区准同步实地验证,表明MODIS第7波段的反射率与地表土壤湿度之间有较好的负线性相关关系,并建立了回归方程。分析结果表明使用MODIS数据第7波段的反射率可以大面积对沙漠化地区土壤湿度进行监测。 |
| 英文摘要: |
| Soil moisture is the most important parameter in hydrology, meteorology as well as in the fields of agricul-tural sciences. This paper proposes that the reflectivity of the 6th and the 7th wave band of MODIS image can be used to monitor soil moisture according to the water absorption rate curve. By detailed comparisons and analysis with temperature vegetation drought index(TVDI), we confim that reflectivity of band 7 of MODIS image covering the desertification area in Mu Us desert of China performs good negative correlations characteristics，close to the relations between MODIS band 7 reflectivity and surface humidity. It is also verified that the reflectivity of band 7 from MODIS image is very effective for large scale soil moisture monitoring in the desertification areas. |
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