BathymetryA [USGS]--Offshore Aptos, California

This part of DS 781 presents data for the bathymetry and shaded-relief maps of Offshore of Aptos map area, California. Bathymetry data are provided as two separate grids depending on mapping agency and processing method. The raster data files are included in "BathymetryA_USGS_OffshoreAptos.zip," which is accessible from http://dx.doi.org/10.5066/F7K35RQB.
The bathymetry and shaded-relief maps of Offshore Aptos, California, were generated from bathymetry data collected by the U.S. Geological Survey (USGS) and by California State University, Monterey Bay (CSUMB). Mapping was completed between 2006 and 2009 using a combination of a 244-kHz Reson 8101 multibeam echosounder and a 234-kHz SEA SWATHplus bathymetric sidescan-sonar system. The mapping missions collected bathymetry data from about the 10-m isobath to beyond the 3-nautical-mile limit of California’s State Waters. NOTE: The horizontal datum of this bathymetry data (NAD83) differs from the horizontal datum of other layers in this data release (WGS84).

本数据集（DS 781）的该章节提供了加利福尼亚州阿普托斯近海制图区域的水深测量（bathymetry）数据与晕渲地貌图（shaded-relief maps）。依据制图机构与数据处理方法的差异，水深测量数据分为两个独立格网数据集。栅格数据文件封装于"BathymetryA_USGS_OffshoreAptos.zip"压缩包中，可通过链接http://dx.doi.org/10.5066/F7K35RQB获取。

加利福尼亚州阿普托斯近海的水深测量数据及晕渲地貌图，由美国地质调查局（U.S. Geological Survey，简称USGS）与加州州立大学蒙特雷湾分校（California State University, Monterey Bay，简称CSUMB）采集的水深数据生成。本次制图工作于2006年至2009年间完成，采用244kHz Reson 8101多波束测深仪与234kHz SEA SWATHplus水深侧扫声呐系统的组合方案。本次测绘任务采集了约10米等深线至加利福尼亚州管辖海域3海里边界以外区域的水深测量数据。

注意：本次水深测量数据采用的水平基准面（horizontal datum）为NAD83，与本数据发布中其他图层所使用的WGS84水平基准面不一致。