CCAP Water Cover 2020-2021

The NOAA Coastal Change Analysis Program (C-CAP) produces national standardized land cover and change products for the coastal regions of the U.S. C-CAP products inventory coastal intertidal areas, wetlands, and adjacent uplands with the goal of monitoring changes in these habitats through time. The timeframe for this metadata is 2020 through 2021, depending on the latest date of available imagery. These maps were developed utilizing high resolution 30cm or better aerial imagery. In addition, a digital surface model (DSM) derived from the stereo imagery was used to determine vegetation heights. This information provides managers with a detailed accounting of current landscape conditions related to impervious surface, woody canopy, and water feature extents.美国国家海洋和大气管理局（National Oceanic and Atmospheric Administration, NOAA）海岸变化分析项目（Coastal Change Analysis Program, 简称C-CAP）为美国沿海地区制作全国标准化的土地覆盖与变化产品。C-CAP产品对沿海潮间带、湿地及邻近高地进行清查，旨在长期监测此类生境的动态变化。本元数据的时间跨度为2020年至2021年，具体取决于可用影像的最新拍摄日期。此类地图依托分辨率不低于30厘米的高分辨率航空影像制作而成。此外，项目还利用由立体影像提取的数字表面模型（Digital Surface Model, DSM）来测算植被高度。该数据集可为管理者提供关于当前与不透水面、木本冠层及水域范围相关的景观现状的详细统计数据。