USFS Analytical 2011 Tree Canopy Cover Standard Error Puerto Rico Virgin Islands (Image Service)

The USDA Forest Service (USFS) builds multiple versions of percent tree canopy cover data, in order to serve needs of multiple user communities. These datasets encompass CONUS, Coastal Alaska, Hawaii, U.S. Virgin Islands and Puerto Rico. There are three versions of data within the 2016 TCC Product Suite, which include:
The initial model outputs referred to as the Analytical data;
A masked version of the initial output referred to as Cartographic data;
And a modified version built for the National Land Cover Database and referred to as NLCD data, which includes a canopy cover change dataset derived from subtraction of datasets for the nominal years of 2011 and 2016.
The Analytical data are the initial model outputs generated in the production workflow. These data are best suited for users who will carry out their own detailed statistical and uncertainty analyses on the dataset and place lower priority on the visual appearance of the dataset for cartographic purposes. Datasets for the nominal years of 2011 and 2016 are available.

The Cartographic products mask the initial model outputs to improve the visual appearance of the datasets. These data are best suited for users who prioritize visual appearance of the data for cartographic and illustrative purposes. Datasets for the nominal years of 2011 and 2016 are available.

The NLCD data are the result of further processing of the masked data. The goal was to generate three coordinated components. The components are (1) a dataset for the nominal year of 2011, (2) a dataset for the nominal year of 2016, and (3) a dataset that captures the change in canopy cover between the two nominal years of 2011 and 2016. For the NLCD data, the three components meet the criterion of 2011 TCC + change in TCC = 2016 TCC. These NLCD data are best suited for users who require a coordinated three-component data stack where each pixels values meet the criterion of 2011 TCC + change in TCC = 2016 TCC. Datasets for the nominal years of 2011 and 2016 are available, as well as a dataset that captures the change (loss or gain) in canopy cover between those two nominal years of 2011 and 2016, in areas where change was identified.

These tree canopy cover data are accessible for multiple user communities, through multiple channels and platforms, as listed below:
Analytical
USFS Tree Canopy Cover Datasets (Download)
USFS Enterprise Data Warehouse (Image Service)
Cartographic
USFS Tree Canopy Cover Datasets (Download)
USFS Enterprise Data Warehouse (Map Service)
NLCD
Multi-Resolution Land Characteristics (MRLC) Consortium (Download)
USFS Enterprise Data Warehouse (Image Service)
The Puerto Rico and the US Virgin Islands TCC NLCD change dataset is comprised of a single layer. The pixel values range from -97 to 98 percent where negative values represent canopy loss and positive values represent canopy gain. The background is represented by the value 127 and data gaps are represented by the value 110 since this is a signed 8-bit image.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.

美国农业部林业服务局（USDA Forest Service，简称USFS）构建了多个版本的树木冠层覆盖率数据集，以满足多个用户群体的需求。这些数据集涵盖了美国大陆、阿拉斯加沿海地区、夏威夷、美属维尔京群岛和波多黎各。在2016年TCC产品套件中，包含三个版本的数据，具体如下：

1. 被称为分析数据的初始模型输出；
2. 被称为地图数据的初始输出掩码版；
3. 为国家土地覆盖数据库（National Land Cover Database，简称NLCD）构建的修改版数据，该数据包括从2011年和2016年名义年份的数据集中减去得到的冠层覆盖率变化数据集。

分析数据是生产流程中生成的初始模型输出。这些数据最适合用户进行详细的统计和不确定性分析，而对于地图用途的数据集视觉呈现则不太重视。2011年和2016年的名义年份数据集均可用。

地图产品通过掩码初始模型输出，以改善数据集的视觉呈现。这些数据最适合重视数据视觉呈现的用户，用于地图和插图目的。2011年和2016年的名义年份数据集均可用。

NLCD数据是对掩码数据的进一步处理结果。目标是生成三个协调组件：（1）2011年的数据集；（2）2016年的数据集；（3）捕捉2011年和2016年两个名义年份之间冠层覆盖率变化的数据库。对于NLCD数据，这三个组件满足2011年TCC加上TCC变化等于2016年TCC的标准。这些NLCD数据最适合需要协调的三组件数据栈的用户，其中每个像素值均满足2011年TCC加上TCC变化等于2016年TCC的标准。2011年和2016年的名义年份数据集均可用，以及捕捉2011年和2016年两个名义年份之间冠层覆盖率（损失或增加）变化的数据库，在变化被识别的地区。

这些树木冠层覆盖率数据可通过以下多种渠道和平台供多个用户群体访问：

分析数据
- USFS树木冠层覆盖率数据集（下载）
- USFS企业数据仓库（图像服务）

地图数据
- USFS树木冠层覆盖率数据集（下载）
- USFS企业数据仓库（地图服务）

NLCD
- 多分辨率土地特征（Multi-Resolution Land Characteristics，简称MRLC）联盟（下载）
- USFS企业数据仓库（图像服务）

波多黎各和美属维尔京群岛的TCC NLCD变化数据集由单层组成。像素值范围为-97至98%，其中负值表示冠层损失，正值表示冠层增加。背景由值127表示，数据缺失由值110表示，因为这是一个有符号的8位图像。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目录。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。