C-ROD with water elevations - SWCE 2070 1 Percent Risk of Flood Polygon

Multi-part polygon showing water elevation values, with precision of 0.1 feet. This layer was created from the Woods Hole Group's approved SWCE 2070 1% approach. The Significant Wave Crest Elevation layer is based on the MC-FRM raster for the 2070 1% chance flood event, developed by Woods Hole Group. All 999x values (which denote areas of uncertainty) were set to No Data before the SWCE formula was run. In the formula below, WSE represents Water Surface Elevation, and DFE represents Design Flood Elevation: SWCE = [WSE + (DFE - WSE)/2.27] After running the formula, a polygon layer was created from the raster layer by Jess November in the Salem Engineering Department.多部件多边形图层展示水位高程数值，精度为0.1英尺。本图层基于伍兹霍尔集团（Woods Hole Group）审定通过的有效波峰高程（Significant Wave Crest Elevation，SWCE）2070年1%概率方法制作。有效波峰高程图层以伍兹霍尔集团开发的2070年1%概率洪水事件对应的MC-FRM栅格数据为基础构建。在运行SWCE计算公式前，所有标记不确定性区域的999x类数值均被设置为无数据（No Data）。下述公式中，WSE代表水面高程（Water Surface Elevation），DFE代表设计洪水高程（Design Flood Elevation）：SWCE = [WSE + (DFE - WSE)/2.27]。完成公式计算后，塞勒姆工程部门（Salem Engineering Department）的杰斯·诺沃（Jess November）基于该栅格图层生成了本多边形图层。