BedrockDepthOD

This data layer consists of a polygon coverage (BRDPxx2D) derived from 1:250,000-scale source materials, containing depth-to-bedrock estimates and related information used in preparing the Groundwater Contamination Susceptibility Model (GCSM) for Wisconsin. The primary source for the Bedrock Depth data layer is a 1973 map at 1:1,000,000 scale published by the Wisconsin Geological & Natural History Survey (WGNHS) and USGS. Where more recent information was available, the USGS updated the 50-foot and 100-foot contours of the depth-to-bedrock map at a scale of 1:250,000. Soil associations data, and other information, were used to add a 5-foot contour to the data layer.本数据图层为基于1:25万比例尺源资料生成的多边形覆盖区（BRDPxx2D），包含基岩埋深估算值及相关辅助信息，用于构建威斯康星州的地下水污染敏感性模型（Groundwater Contamination Susceptibility Model, GCSM）。该基岩埋深数据图层的主要数据源为1973年由威斯康星州地质与自然历史调查局（Wisconsin Geological & Natural History Survey, WGNHS）与美国地质调查局（USGS）联合发布的1:100万比例尺地图。在可获取更新资料的区域，美国地质调查局对该1:25万比例尺基岩埋深图的50英尺与100英尺等高线进行了修订。研究团队还结合土壤组合数据及其他相关信息，为该数据图层新增了5英尺等高线。