NLCD2006 Land Cover (NLCD2006_landcover_4-20-11_se5.zip)

National Land Cover Database 2006 (NLCD2006) is a 16-class land cover classification scheme that has been applied consistently across the conterminous United States at a spatial resolution of 30 meters. NLCD2006 is based primarily on the unsupervised classification of Landsat Enhanced Thematic Mapper+ (ETM+) circa 2006 satellite data. NLCD2006 also quantifies land cover change between the years 2001 to 2006. The NLCD2006 land cover change product was generated by comparing spectral characteristics of Landsat imagery between 2001 and 2006, on an individual path/row basis, using protocols to identify and label change based on the trajectory from NLCD2001 products. It represents the first time this type of 30 meter resolution land cover change product has been produced for the conterminous United States. A formal accuracy assessment of the NLCD2006 land cover change product is planned for 2011. Generation of NLCD2006 products helped to identify some issues in the NLCD2001 land cover and p

国家土地覆盖数据库2006年（NLCD2006）是一种应用于美国大陆并保持一致性的16类土地覆盖分类方案，其空间分辨率为30米。NLCD2006主要基于对Landsat增强型专题制图仪+（ETM+）大约2006年的卫星数据进行的无监督分类。NLCD2006还量化了2001年至2006年间的土地覆盖变化。NLCD2006土地覆盖变化产品是通过比较2001年至2006年间Landsat影像的光谱特征，逐条路径/行进行，并采用基于NLCD2001产品轨迹的识别和标签变化协议生成的。这标志着首次为美国大陆生产此类30米分辨率土地覆盖变化产品。计划于2011年对NLCD2006土地覆盖变化产品进行正式的精度评估。NLCD2006产品的生成有助于识别NLCD2001土地覆盖中的一些问题。