MODIS资料在2005年陕西春旱过程监测中的应用

从可业务化的角度,在近年研究开发的NOAA/AVHRR遥感干旱监测业务化模型的基础上,充分考虑引起干旱的水热条件以及土壤覆盖类型等因子,结合陕西的地形、气候、植被覆盖特征,建立了基于MODIS数据的区域性干旱遥感监测的业务化模型和资料处理流程.通过对陕西2005年3-5月发生严重春旱过程的监测,结果表明使用基于MODIS数据的热惯量和植被供水指数两种模型进行区域性遥感干旱监测是可行的,修正后的植被供水指数模型在干旱面积估算精度和图像的可视化效果方面有了明显提高.

Application of MODIS Data on Drought Monitoring in Shaanxi Province for Spring of 2005

Based on the work of routine operation on the drought monitoring applying remote sensing model by NOAA/AVHRR data in recent years,the regional drought monitoring model by MODIS and the process of data treatment was established,considering the factors related to drought,such as water,land use/cover,topographic factor,climate and vegetation coverage in Shaanxi Province.By using the established model and work flow,the severe spring drought of 2005 in Shaanxi Province was successfully monitored.The results showed that the drought monitoring applying remote sensing,based on the MODIS data by the thermal inertia method and vegetation supply water index(VSWI),was feasible.The modified VSWI model could improve the precision and visual effect of the estimated drought area.