Bathymetry--Offshore of Tomales Point, California

This part of DS 781 presents data for the bathymetry and shaded-relief maps of the Offshore of Tomales Point map area, California. Raster data file is included in "Bathymetry_OffshoreTomalesPoint.zip," which is accessible from http://pubs.usgs.gov/ds/781/OffshoreTomalesPoint/data_catalog_OffshoreTomalesPoint.html. The bathymetry and shaded-relief maps of the Offshore of Tomales Point Map Area, California, were generated from bathymetry data collected by California State University, Monterey Bay (CSUMB), by Fugro Pelagos, and by the U.S. Geological Survey. Mapping was completed between 2004 and 2010, using a combination of 200-kHz and 400-kHz Reson 7125, and 244-kHz Reson 8101 multibeam echosounders, as well as 234-kHz and 468-kHz SEA SWATHPlus phase-differencing sidescan sonars. These mapping missions combined to collect bathymetry from about the 10-m isobath to beyond the 3-nautical-mile limit of California's State Waters. NOTE: the horizontal datum of the bathymetry data (NAD83) differs from the horizontal datum of other layers in this data series (WGS84). Some bathymetry grids within this map were projected horizontally from WGS84 to NAD83 using ESRI tools to be more consistent with the vertical reference of the North American Vertical Datum of 1988 (NAVD88). These data are not intended for navigational purposes.本数据集（DS 781）的此部分提供了加利福尼亚州托马勒斯角近海制图区域的水深图与晕渲地形图数据。栅格数据文件收录于"Bathymetry_OffshoreTomalesPoint.zip"压缩包中，可通过链接http://pubs.usgs.gov/ds/781/OffshoreTomalesPoint/data_catalog_OffshoreTomalesPoint.html获取。加利福尼亚州托马勒斯角近海制图区域的水深图与晕渲地形图，由加州州立大学蒙特雷湾分校（California State University, Monterey Bay, CSUMB）、富古罗佩拉戈斯（Fugro Pelagos）及美国地质调查局（U.S. Geological Survey）采集的水深数据生成。制图工作于2004年至2010年间完成，所用设备包括200kHz与400kHz的Reson 7125多波束测深仪、244kHz的Reson 8101多波束测深仪，以及234kHz与468kHz的SEA SWATHPlus相位差分侧扫声呐。本次测绘任务共采集了约10米等深线至加利福尼亚州领海3海里界限以外区域的水深数据。请注意：本次水深数据的水平基准面为NAD83，与本数据系列中其他图层的水平基准面WGS84不一致。本制图区域内的部分水深栅格已通过ESRI工具从WGS84投影至NAD83，以更好地匹配1988北美垂直基准面（North American Vertical Datum of 1988, NAVD88）的垂直参考系。本数据集不得用于导航用途。