NLCD 2001 Land Cover (2011 Edition, amended 2014) - National Geospatial Data Asset (NGDA) Land Use Land Cover

The National Land Cover Database 2001 Land Cover 2011 Edition layer is produced through a cooperative project conducted by the Multi-Resolution Land Characteristics (MRLC) Consortium. The MRLC Consortium is a partnership of federal agencies (www.mrlc.gov), consisting of the U.S. Geological Survey (USGS), the National Oceanic and Atmospheric Administration (NOAA), the U.S. Environmental Protection Agency (EPA), the U.S. Department of Agriculture - Forest Service (USDA-FS), the National Park Service (NPS), the U.S. Fish and Wildlife Service (FWS), the Bureau of Land Management (BLM) and the USDA Natural Resources Conservation Service (NRCS). One of the primary goals of the project is to generate a current, consistent, seamless, and accurate National Land Cover Database (NLCD) circa 2001 for the United States at medium spatial resolution. This land cover map and all documents pertaining to it are considered "provisional" until a formal accuracy assessment can be conducted. For a detailed definition and discussion on MRLC and the NLCD 2001 products, refer to Homer et al. (2004) and http://www.mrlc.gov/mrlc2k.asp. The NLCD 2001 is created by partitioning the U.S. into mapping zones. A total of 66 mapping zones were delineated within the conterminous U.S. based on ecoregion and geographical characteristics, edge matching features and the size requirement of Landsat mosaics. This update represents a seamless assembly of updated NLCD 2001 Land Cover (2011 Edition) for all 66 MRLC mapping zones. Questions about the NLCD the NLCD 2001 Land Cover 2011 Edition can be directed to the NLCD 2001 land cover mapping team at USGS EROS, Sioux Falls, SD [phone] or [e-mail].

2001年国家土地覆盖数据库2011版土地覆盖图层，由多分辨率土地特征联盟（Multi-Resolution Land Characteristics, MRLC）牵头的合作项目研发完成。MRLC联盟是多家美国联邦机构组成的合作联合体（官网：www.mrlc.gov），成员包括美国地质调查局（U.S. Geological Survey, USGS）、美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）、美国环境保护署（U.S. Environmental Protection Agency, EPA）、美国农业部森林服务局（U.S. Department of Agriculture - Forest Service, USDA-FS）、美国国家公园管理局（National Park Service, NPS）、美国鱼类及野生动物管理局（U.S. Fish and Wildlife Service, FWS）、美国土地管理局（Bureau of Land Management, BLM）以及美国农业部自然资源保护服务局（USDA Natural Resources Conservation Service, NRCS）。本项目的核心目标之一，是为美国本土制作一套现势性强、标准统一、无缝衔接且精度可靠的约2001年国家土地覆盖数据库（National Land Cover Database, NLCD），空间分辨率为中等尺度。该土地覆盖图及所有相关文档均被视为"暂定版本"，需待正式精度评估完成后才可正式发布。如需了解MRLC及NLCD 2001产品的详细定义与说明，请参阅Homer等人（2004）的研究成果及http://www.mrlc.gov/mrlc2k.asp 网页。NLCD 2001产品通过将美国划分为制图分区的方式生成：基于生态区域与地理特征、边缘匹配要素以及陆地卫星（Landsat）镶嵌图的尺寸规范，美国本土范围内共划定66个制图分区。本次更新实现了66个MRLC制图分区的2001年土地覆盖数据（2011版）的无缝拼接。若对NLCD 2001土地覆盖2011版存在疑问，请联系位于南达科他州苏福尔斯市美国地质调查局EROS中心的NLCD 2001土地覆盖制图团队，联系电话：[phone]，电子邮箱：[e-mail]。