利用MODIS资料监测和预警干旱新方法

为了提高遥感监测土壤水分和干旱的技术水平,在对常用遥感监测土壤水分和干旱方法进行评价的基础上,根据土壤热力学理论,提出了利用EOS/MODIS资料遥感监测农业干旱的新方法———能量指数模式。实际监测应用结果表明,能量指数模式更适合农作物土壤水分和干旱的监测,监测效果明显优于已经业务化的其它模式。农作物生长季节干旱的预警应当在土壤水分遥感监测的基础上,考虑未来预警期内的预报降水量和最高气温,并且把这个预报降水量和最高气温定量转化为土壤水分订正值,按照当地的标准划分成干旱预警等级。

New Method for Drought Monitoring and Prewarning with EOS/MODIS

In order to improve soil moisture and drought monitoring with remote sensing technology,on the basis of commonly used methods and soil thermodynamics,a new way of drought monitoring with EOS/MODIS data,the energy index method,is proposed.The outcome of application shows that the method performs well in soil moisture and drought monitoring,obviously superior to presently used methods.It is pointed out that drought prewarning should be base on soil moisture and remote-sensing drought monitoring measurements,as well as precipitation and temperature forecasts,which need to be converted into the corrected soil moisture and added into the resulting drought level according to the related standards.