Modeled Shoals

The MMIS ModeledShoals feature class is a static copy (exported summer 2023) of the dataset titled "NCCOS Assessment: Modeled Distribution of sand shoals of the Gulf of Mexico and US Atlantic Coast (NCEI Accession 0221906)", which is accessible at this web address: https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=gov.noaa.nodc:0221906. In the metadata for that dataset, the Description/Abstract reads "The sand shoals (modeled) polygons represent the hypothesized distribution of sand shoals of the Gulf of Mexico and US Atlantic Coast based on seafloor characteristics and distance to shoreline variables. Defined by Rutecki et al. (2014), a sand shoal is "a natural, underwater ridge, bank, or bar consisting of, or covered by, sand or other unconsolidated material, resulting in shallower water depths than surrounding areas." In the dataset, attributes characterize shoals with a classification scheme developed with a basis in the Coastal and Marine Ecological Classification Standard (CMECS).MMIS建模沙洲要素类（feature class）是《海岸与海洋科学国家中心（National Centers for Coastal and Ocean Science, NCCOS）评估：墨西哥湾与美国大西洋海岸沙洲建模分布（国家环境信息中心（National Centers for Environmental Information, NCEI）存档编号0221906）》的静态副本（2023年夏季导出），该数据集可通过以下网址访问：https://www.ncei.noaa.gov/access/metadata/landing-page/bin/iso?id=gov.noaa.nodc:0221906。在该数据集的元数据中，描述/摘要部分载明："建模沙洲多边形基于海底特征与距岸距离变量，表征了墨西哥湾与美国大西洋海岸沙洲的假设分布范围。根据Rutecki等人（2014）的定义，沙洲是‘由沙子或其他松散物质构成或覆盖的自然水下山脊、滩涂或沙坝，形成比周边水域更浅的水深区域’。本数据集采用以海岸与海洋生态分类标准（Coastal and Marine Ecological Classification Standard, CMECS）为基础开发的分类体系，对沙洲的属性特征进行刻画。