Bathymetric change of Central San Francisco Bay, California: 1971 to 2020

This 25-m-resolution surface presents bathymetric change of Central San Francisco Bay, California (hereafter referred to as Central Bay). This surface compares a 1-m-resolution digital elevation model (DEM) of the central portion of San Francisco Bay (Fregoso and others, 2021), comprised of bathymetry data in the Central Bay region from the time period referred to as the 2010s because the majority of the surveys were in that decade, to a 25-m-resolution DEM of Central Bay comprised of historic surveys from 1971 to 1984 (referred to as the 1980s because the majority of the surveys were in that decade). The creation of this change surface involved the resampling of the 1-m-resolution 2010s DEM to match the 25-m-resolution 1980s Central Bay DEM. Adjusting the 1990 surface to account for the modern tidal cycle while also applying a bias correction in attempts to account for interpolation uncertainties.

本25米分辨率地表模型展示了加利福尼亚州旧金山湾中部（以下简称“中央湾”）的水深变化。该模型将Fregoso等人2021年发布的、基于2010年代（多数测绘工作集中于该十年）中央湾区域水深数据构建的1米分辨率旧金山湾中部数字高程模型（Digital Elevation Model，DEM），与基于1971至1984年历史测绘数据构建的25米分辨率中央湾数字高程模型（多数测绘工作集中于1980年代，简称“1980年代模型”）进行对比。本变化地表模型的构建需将2010年代1米分辨率DEM重采样至与1980年代中央湾25米分辨率DEM匹配的分辨率，同时需对1990年地表模型进行调整以适配现代潮汐周期，并通过偏差校正尝试消除插值不确定性带来的影响。