USFS Cartographic 2011 Tree Canopy Cover Coastal AK (Map Service)

The National Land Cover Database 2011 (NLCD2011) percent tree canopy cover (TCC 2011) layer was produced through a cooperative project conducted by the Multi-Resolution Land Characteristics (MRLC) Consortium (www.mrlc.gov). The MRLC Consortium is a partnership of federal agencies, consisting of the U.S. Geological Survey, the National Oceanic and Atmospheric Administration, the U.S. Environmental Protection Agency, the U.S. Department of Agriculture (USDA) National Agricultural Statistics Service, the U.S. Forest Service, the National Park Service, the U.S. Fish and Wildlife Service, the Bureau of Land Management, NASA, and the U.S. Army Corps of Engineers. One of the primary goals of the project was to generate a current, consistent, and seamless national land cover, percent tree canopy cover, and percent impervious cover at medium spatial resolution. TCC 2011 is the NLCD tree canopy cover dataset at medium spatial resolution (30 m). It was produced by the USDA Forest Service Remote Sensing Applications Center (RSAC). The TCC 2011 dataset has two layers: percent tree canopy cover and standard error. For the tree canopy cover layer, the pixel values range from 0 to 100 percent. For the standard error layer, the pixel values range from 0 to 45 percent. The standard error represents the model uncertainty associated with the corresponding pixel in the tree canopy cover layer. The tree canopy cover layer was produced using a Random Forests' regression algorithm and the standard error layer was calculated from the variance of the canopy cover estimates from the random forest regression trees.This record was taken from the USDA Enterprise Data Inventory that feeds into the https://data.gov catalog. Data for this record includes the following resources: ISO-19139 metadata ArcGIS Hub Dataset ArcGIS GeoService For complete information, please visit https://data.gov.

国家土地覆盖数据库2011年（NLCD2011）的百分比树冠覆盖率（TCC 2011）层是由多分辨率土地特性联盟（MRLC Consortium，网址：www.mrlc.gov）联合实施的协作项目所生成。MRLC联盟是由联邦机构组成的合作伙伴关系，包括美国地质调查局、国家海洋和大气管理局、美国环境保护署、美国农业部国家农业统计服务局、美国森林管理局、国家公园管理局、美国鱼类和野生动物管理局、土地管理局、美国国家航空航天局以及美国陆军工程兵团。该项目的首要目标之一是生成一个当前、一致且无缝的国家土地覆盖、百分比树冠覆盖率和百分比不透水覆盖率，其空间分辨率为中等。TCC 2011是NLCD在中等空间分辨率（30米）下的树冠覆盖率数据集。该数据集由美国农业部森林管理局遥感应用中心（RSAC）生成。TCC 2011数据集包含两层：百分比树冠覆盖率和标准误差。对于树冠覆盖率层，像素值范围从0至100%。对于标准误差层，像素值范围从0至45%。标准误差代表了与树冠覆盖率层中相应像素相关的模型不确定性。树冠覆盖率层是通过随机森林回归算法生成的，而标准误差层则是从随机森林回归树中树冠覆盖率估计的方差计算得出。此记录来源于为https://data.gov目录提供数据的美国农业部企业数据清单。该记录的数据包括以下资源：ISO-19139元数据、ArcGIS Hub数据集、ArcGIS GeoService。欲获取完整信息，请访问https://data.gov。