National Land Cover Data set 1992 (NLCD1992)

National Land Cover Dataset 1992 (NLCD1992) is a 21-class land cover classification scheme that has been applied consistently across the lower 48 United States at a spatial resolution of 30 meters. NLCD92 is based primarily on the unsupervised classification of Landsat Thematic Mapper (TM) circa 1990's satellite data. Other ancillary data sources used to generate these data included topography, census, and agricultural statistics, soil characteristics, and other types of land cover and wetland maps. NLCD1992 is the only NLCD dataset that can be downloaded by state and by user defined area from the MRLC Consortium Viewer.

1992年全国土地覆盖数据集（National Land Cover Dataset 1992，简称NLCD1992）是一套包含21个类别的土地覆盖分类体系，已在美国本土48州以30米的空间分辨率实现统一应用。该数据集常被简称为NLCD92，其生成主要基于20世纪90年代左右的陆地卫星专题制图仪（Landsat Thematic Mapper，简称TM）卫星数据的无监督分类。此外，制作该数据集还辅以其他多类数据源，包括地形数据、人口普查与农业统计数据、土壤特性数据，以及各类土地覆盖和湿地地图。NLCD1992是目前唯一一款可通过MRLC联盟查看器（MRLC Consortium Viewer）按州以及用户自定义区域进行下载的NLCD系列数据集。