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.本数据集DS 781的这一部分，收录了针对美国加利福尼亚州南部圣巴巴拉海峡区域及周边海域的Z206SC航次视频观测数据。其矢量数据文件包含于"z206sc_video_observations.zip"压缩包中，可通过链接http://pubs.usgs.gov/ds/781/video_observations/data_catalog_video_observations.html获取。 Z206SC航次的部分视频观测数据已发表于《科学调查地图集3254：加利福尼亚州水域地图系列——加利福尼亚州文图拉近海》（详见第6幅图幅）。此外，该航次的部分视频观测数据将收录于该区域后续发布的3幅加利福尼亚州水域地图系列科学调查地图（即卡平特里亚近海、圣巴巴拉近海、科伊尔角近海的图幅）[注：本文撰写时，上述3幅图幅中的1幅已正式发布：卡平特里亚近海图幅（科学调查地图集3254）]。 2006年至2007年间，加利福尼亚州立大学蒙特雷湾分校海底测绘实验室（CSUMB）与美国地质调查局（USGS）联合对加利福尼亚州南部的文图拉近海、卡平特里亚近海、圣巴巴拉近海、科伊尔角近海、雷夫吉奥海滩近海区域开展海底测绘工作，所用设备涵盖多波束测深仪与测深侧扫声呐装置（详细信息可参见《科学调查地图集3254》的第1、2、3幅图幅）。此次联合测绘任务采集了从约10米等深线至超出加利福尼亚州3海里领海范围区域的水深数据与声学背散射数据。为验证声呐数据解译结果，将其转化为具备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：通过在区域内指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（一台正向拍摄、一台垂直拍摄）、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研究船，美国地质调查局与美国国家海洋和大气管理局（NOAA）的科研人员每分钟通过可编程按键面板记录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秒捕获一张数码静态照片。本ArcGIS形状文件包含摄像机位置、每次观测的起始时间，以及地质与生物栖息地的目视观测记录。