Science Tree Canopy Cover (TCC) Hawaii

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（United States Department of Agriculture Forest Service, USFS）开发了两款百分比树木冠层覆盖率数据集，以满足多类用户群体的需求。此类数据集覆盖美国本土（conterminous United States, CONUS）、阿拉斯加沿海地区、夏威夷以及波多黎各和美属维尔京群岛（Puerto Rico and U.S. Virgin Islands, PRUSVI）。在2023-5版树木冠层覆盖率（Tree Canopy Cover, TCC）产品套件中，包含两款数据：其一为初始模型输出成果，称为科学版数据；其二为针对国家土地覆盖数据库（National Land Cover Database, NLCD）开发的优化修改版数据，即NLCD数据。NLCD产品套件涵盖1985年至2023年的数据集。NLCD数据会经过预处理流程：掩膜去除水体、非林木作物等非植被区域的TCC数值，同时抑制年际噪声以平滑NLCD时间序列数据。TCC像素值的取值范围为0至100%，无有效处理的区域以像素值254表示，背景区域则以像素值255表示。科学版与NLCD版树木冠层覆盖率数据可通过多渠道、多平台面向多类用户群体开放获取。有关科学版数据及其处理流程的详细信息，请参阅科学版元数据文档；有关NLCD数据及其处理流程的说明已包含在本文档中。数据下载与方法文档链接：https://data.fs.usda.gov/geodata/rastergateway/treecanopycover/