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使用1987—2011年Landsat TM/ETM+稠密时间序列数据,以南京市老山林场和紫金山森林为研究对象,通过Ledaps预处理系统生成地表反射率数据集,采用植被变化追踪模型(VCT)得到南京城市森林的干扰及恢复历史数据库产品,并对产品进行验证.结果表明:空间一致性为65.4%~95.0%,VCT产品监测森林干扰具有较高的空间一致性.2个研究区的森林干扰和恢复随着时间变化波动明显,干扰变化规律相似,但森林恢复规律明显不同.紫金山的森林覆盖率小于老山林场,但总体上,老山林场的森林干扰率和恢复率大于紫金山.
Using the dense time series data of Landsat TM / ETM + from 1987 to 2011, the Laoshan Forest Farm and the Purple Mountain Forest in Nanjing City were selected as the research object. The surface reflectance data set was generated by the Ledaps pretreatment system and the vegetation change tracking model (VCT) Urban forest interference and restoration of historical database products, and verify the product.The results show that the spatial consistency is 65.4% -95.0%, VCT product monitoring forest disturbance has high spatial consistency.The forest disturbance and The change of recovery with time is obvious and the variation of disturbance is similar, but the law of forest restoration is obviously different. The forest coverage of Zijinshan is smaller than that of Laoshan forest. However, on the whole, the rate of forest disturbance and recovery of Laoshan forest is larger than that of Purple Mountain.