z206sc_video_observations

This part of DS 781 presents video observations from cruise Z206SC for the Santa Barbara Channel region and beyond in southern California. The vector data file is included in "z206sc_video_observations.zip," which is accessible from http://pubs.usgs.gov/ds/781/video_observations/data_catalog_video_observations.html. Some of the video observations from cruise Z206SC are published in Scientific Investigations Map 3254, "California State Waters Map Series--Offshore of Ventura, California" (see sheet 6). In addition, some of the video observations will be published in three future California State Waters Map Series SIMs of the region (namely, the Offshore of Carpinteria, Offshore of Santa Barbara, Offshore of Coal Oil Point, and Offshore of Coal Oil Point map areas) [note that, at the time of this writing, one of the other three SIMs have been published: the Offshore of Carpinteria map area (SIM 3254)]. Between 2006 and 2007, the seafloor in the Offshore of Ventura, Offshore of Carpinteria, Offshore of Santa Barbara, Offshore of Coal Oil Point, Offshore of Refugio Beach, map areas in southern California was mapped by California State University, Monterey Bay, Seafloor Mapping Lab (CSUMB) and by the U.S. Geological Survey (USGS), using both multibeam echosounders and bathymetric sidescan sonar units (for example, see sheets 1, 2, and 3, SIM 3254, for details). These mapping missions combined to collect bathymetry and acoustic-backscatter data from about the 10-m isobath to out beyond the 3-nautical-mile limit of California's State Waters. To validate the interpretations of sonar data in order to turn it into geologically and biologically useful information, the USGS ground-truth surveyed the data by towing camera sleds over specific locations throughout the region. During the 2008 ground-truth cruise, the camera sled housed two video cameras (one forward looking and the other vertical looking), a high-definition video camera, and an 8-megapixel digital still camera. The video was fed in real time to the research vessel, where USGS and NOAA scientists recorded both the geologic and biologic character of the seafloor into programmable keypads once every minute. In addition to recording the seafloor characteristics, a digital still photograph was captured once every 30 seconds. This ArcGIS shape file includes the position of the camera, the time each observation was started, and the visual observations of geologic and biologic habitat.本部分内容属于DS 781数据集，包含美国加利福尼亚州南部圣巴巴拉海峡及周边海域Z206SC航次的视频观测数据。矢量数据文件包含于"z206sc_video_observations.zip"压缩包中，可通过以下链接获取：http://pubs.usgs.gov/ds/781/video_observations/data_catalog_video_observations.html。 本航次的部分视频观测数据已收录于《科学调查图》（Scientific Investigations Map）3254号，即《加利福尼亚州海域地图集——加利福尼亚州文图拉近海》（详见第6幅图幅）。此外，部分视频观测数据将收录于该区域后续发布的3幅加利福尼亚州海域地图系列科学调查图（Scientific Investigations Maps，简称SIMs）中，涵盖卡平特里亚近海、圣巴巴拉近海、科伊尔角近海、科伊尔角近海共3幅图幅（注：本文撰写时，3幅图幅中的卡平特里亚近海图幅已先行发布，即SIM 3254）。 2006年至2007年间，加利福尼亚州南部文图拉近海、卡平特里亚近海、圣巴巴拉近海、科伊尔角近海及雷富吉奥海滩近海海域的海底由加州州立大学蒙特雷湾分校海底测绘实验室（California State University, Monterey Bay, Seafloor Mapping Lab，简称CSUMB）与美国地质调查局（U.S. Geological Survey，简称USGS）联合测绘，测绘设备涵盖多波束测深仪与侧扫声呐测深装置（详细参数可参考SIM 3254的第1、2、3幅图幅）。本次联合测绘任务采集了从约10米等深线至加州州域海域3海里界限外区域的水深测量数据与声学背散射数据。 为验证声呐数据解译结果，将其转化为具有地质与生物学应用价值的信息，美国地质调查局开展了实地验证勘测：通过在研究区域内特定点位拖曳摄像雪橇完成数据采集。在2008年的实地验证航次中，摄像雪橇搭载了两台摄像机（一台前置式、一台垂直式）、一台高清摄像机以及一台800万像素数码静态相机。视频信号实时传输至科研调查船，美国地质调查局与美国国家海洋和大气管理局（NOAA）的科研人员每一分钟便通过可编程键盘记录下一次海底的地质与生物特征。除记录海底特征外，系统还每30秒拍摄一张数码静态照片。本ArcGIS形状文件包含摄像设备位置、每次观测的起始时间以及地质与生物栖息地的视觉观测记录。