FY-3a卫星数据在青海省三江源区土壤水分监测中的应用

APPLICATION ON FY-3A SATELLITE DATA TO MONITOR SOIL MOISTURE IN THE SOURCE OF THE THREE RIVERS IN QINGHAI PROVINCE

中国新一代极轨气象卫星FY-3a,搭载的中分辨率光谱成像仪(MERSI)具有5个250m分辨率通道,进一步加强了对地表地物的反演能力。本研究利用FY-3a250m分辨率卫星资料,采用植被供水指数法,建立了青海省三江源区土壤水分监测模型,利用气象部门地面常规监测点土壤水分资料,验证了植被供水指数与土壤水分之间的关系,从验证结果看:当植被指数为0.3～0.5时,遥感反演出的土壤水分值与实测值较为接近。

MERSI boarded on the new generation polar olution channel that improves inversional capability on orbit meteorological satellite FY - 3 a has 250 meters res- ground objects in China. This study based on 250 meters resolution satellite data and vegetation water supply index built soil moisture monitoring model in the source of the three rivers in Qinghai province. The relationship of vegetation water supply and soil moisture was verified by using surface conventional observation soil moisture data. The results showed： Soil moisture on remote sens- ing retrieval and observation data coincided rather well, when vegetation index is 0.3 - 0.5.