National Land Cover Database (NLCD) Tree Canopy Cover (TCC) Puerto Rico USVI

The USDA Forest Service (USFS) builds two versions of percent tree canopy cover data, in order to serve needs of multiple user communities. These datasets encompass conterminous United States (CONUS), Coastal Alaska, Hawaii, and Puerto Rico and U.S. Virgin Islands (PRUSVI). The two versions of data within the v2023-5 TCC product suite include: The initial model outputs referred to as the Science data; And a modified version built for the National Land Cover Database and referred to as NLCD data. The NLCD product suite includes data for years 1985 through 2023. The NCLD data are processed to mask TCC from non-treed features such as water and non-tree crops, and to reduce interannual noise and smooth the NLCD time series. TCC pixel values range from 0 to 100 percent. The non-processing area is represented by value 254, and the background is represented by the value 255. The Science and NLCD tree canopy cover data are accessible for multiple user communities, through multiple channels and platforms. For information on the Science data and processing steps see the Science metadata. Information on the NLCD data and processing steps are included here. Data Download and Methods Documents: - https://data.fs.usda.gov/geodata/rastergateway/treecanopycover/美国农业部森林服务局（USDA Forest Service, USFS）开发了两款百分比树冠覆盖率（Tree Canopy Cover, TCC）数据版本，以满足多类用户群体的使用需求。该数据集覆盖美国本土（CONUS）、阿拉斯加沿海地区、夏威夷、波多黎各以及美属维尔京群岛（PRUSVI）。在2023-5版TCC产品套件中，包含两类数据：一是被称为科研数据的初始模型输出结果；二是为美国国家土地覆盖数据库（National Land Cover Database, NLCD）开发的改良版本，即NLCD数据。NLCD产品套件涵盖1985年至2023年的数据集。NLCD数据经过处理，会将树冠覆盖率数值从水体、非林木作物等非林木地物中掩膜去除，同时抑制年际噪声并平滑NLCD时间序列数据。TCC的像素值取值范围为0至100%。无处理区域以数值254表示，背景区域则以数值255表示。科研版与NLCD版树冠覆盖率数据可通过多渠道、多平台向多类用户群体开放获取。有关科研版数据及其处理步骤的详情，请参阅科研元数据；有关NLCD数据及其处理步骤的信息已包含在本文档中。数据下载与方法文档：https://data.fs.usda.gov/geodata/rastergateway/treecanopycover/