基于Worldview-2数据的东洞庭湖湿地区域植被覆盖度估算研究

Research on Vegetation Fractional Coverage Estimation of East Dongting Lake Wetland Area Based on Worldview-2 Satellite Data

利用Worldview-2卫星数据八波段多光谱数据特点,分析与近红外波段重叠并具有更高信息量的近红外2新波段特征构建植被指数(VI)的关系。以湖南东洞庭湖湿地区域为研究区,建立近红外2新波段参与的归一化植被指数(NDVI)植被覆盖度估算模型。通过与实测样点结果比较发现:近红外2波段参与改良后的NDVI法的估算结果与实测值验证结果更加匹配,精度达到87.8%;原始近红外波段参与的NDVI法的估算结果精度最低。研究表明运用Worldview-2数据,并采用改良后的NDVI法可以大区域、准确、快速的进行植被覆盖度估算。

A new band named near-infrared 2 band to build vegetation fractional coverage （VFC） estimate model is researched. The near-infrared 2 band is a special band of Worldview-2 satellite eight band spectrum, which has higher information and overlaps original near-infrared band. Near-infrared 2 band is used to participate in the establishment NDVI （The normalized difference vegetation index） , and applyed to VFC estimate of wetland area of East Dongting Lake . With the sample points comparing results show that, Near-infrared 2 band improved VFC estimate model based optimization NDVI method, and the precision is 87.8%. This improved method can be used to accurately and quickly monitor the VFC of large area based on Worldview-2 data.