Continuous and optimized 3-arcsecond elevation model for the United States west coast (32-bit GeoTiff, geographic, NAD83)

Investigations of coastal change and coastal resources often require continuous elevation profiles from the seafloor to coastal terrestrial landscapes. Differences in elevation data collection in the terrestrial and marine environments result in separate elevation products that may not share a vertical datum. This data release contains the assimilation of multiple elevation products into a continuous digital elevation model at a resolution of 3-arcseconds (approximately 90 meters) from the terrestrial landscape to the seafloor for the contiguous U.S., focused on the coastal interface. All datasets were converted to a consistent horizontal datum, the North American Datum of 1983, but the native vertical datum for each dataset was not adjusted. Artifacts in the source elevation products were replaced with other available elevation products when possible, corrected using various spatial tools, or otherwise marked for future correction.

海岸变化与海岸资源相关研究通常需要获取从海底延伸至海岸陆地区域的连续高程剖面。由于陆域与海洋环境的高程数据采集方式存在差异，由此产出的独立高程产品可能采用不同的垂直基准面（vertical datum），难以实现无缝整合。本数据集发布包含多源高程产品的数据同化成果，即针对美国本土（contiguous U.S.）的海岸界面区域，生成从陆地区域至海底的连续数字高程模型（Digital Elevation Model, DEM），分辨率为3角秒（arcseconds，约90米）。所有数据集均已转换至统一的水平基准面（horizontal datum）——1983北美基准面（North American Datum of 1983），但各数据集的原生垂直基准面未作调整。原始高程产品中的数据伪影（artifact）已在可行范围内替换为其他可用高程产品，或通过各类空间工具完成修正，其余无法即时处理的伪影则将被标记以待后续修正。