K-Axis Science Event Log with derived latitude and longitude from underway data

During the K-Axis marine voyage from mid Jan-late Feb 2016, a diverse range of sampling techniques were employed to collect specimens and data. Each sampling event was recorded by scientists and technical support staff in a logbook that was kept in the operations room on board the Aurora Australis. This is a direct digital transcription of the paper logbook with interpolated lat/lon from underway data to supplement start times as recorded in the log. The method used to obtain the supplementary position is described in the associated eventlog_matchup.html file. event_number: A unique event identifier in the log, in the order that the events were written down (usually but not always chronologically)event_type: The code defined and used by each research project to identify the types of equipment deployed or samples collected for an event. event_type_prefix: A non-mandatory prefix field used by some research projects to identify the type of an eventevent_type_number: A sequential number or alphanumeric-number combination defined and used by each research project to identify unique equipment deployment or sample collection eventsstation_number: A universal (voyage-wide) station number used across all projects to identify a nominal lat/lon position defined during voyage planningleg: A nominally straight-line section of the voyage track defined during voyage planning. The voyage track was planned as a series of roughly N-S and E-W transects that intersected in some locations. Legs start at a station and continue through more stations to a vertex-station which is the start of the next leg. Legs are numbered consecutively.waypoint: A GPS waypoint used by Aurora Australis crew, AAD science technical support and researchers to identify target lat/lon positions in the voyage. Some waypoints correspond with station numbers.start_date_utc: The start date of the event in UTCstart_time_utc: The start time of the event in UTCstart_lat_deg: The latitude (whole degrees) of the vessel at the beginning of the eventstart_lat_min: The latitude (minutes) of the vessel at the beginning of the eventstart_lat_dec_deg: The latitude (decimal degrees) of the vessel at the beginning of the eventstart_lon_deg: The longitude (whole degrees) of the vessel at the beginning of the eventstart_lon_min: The longitude (minutes) of the vessel at the beginning of the eventstart_lon_dec_deg: The longitude (decimal degrees) of the vessel at the beginning of the eventend_date_utc: The end date of the event in UTCend_time_utc: The end time of the event in UTCend_lat_deg: The latitude (whole degrees) of the vessel at the end of the eventend_lat_min: The latitude (minutes) of the vessel at the end of the eventend_lat_dec_deg: The latitude (decimal degrees) of the vessel at the end of the eventend_lon_deg: The longitude (whole degrees) of the vessel at the end of the eventend_lon_min: The longitude (minutes) of the vessel at the end of the eventend_lon_dec_deg: The longitude (decimal degrees) of the vessel at the end of the eventremarks: Comments/remarks written by researchers when completing the paper logtranscribe_comments: Comments/remarks made by the transcriber when the log was digitisedutc: The start date and time of the event in UTC start_lon_dec_deg_interp: The latitude (decimal degrees) of the vessel at the beginning of the event interpolated from the vessel underway datastart_lat_dec_deg_interp: The longitude (decimal degrees) of the vessel at the beginning of the event interpolated from the vessel underway data

2016年1月中旬至2月下旬的K轴海洋科考航次期间，研究团队采用多样化采样手段采集样本与观测数据。每一次采样作业均由科学家及技术支持人员记录于“极光南极号（Aurora Australis）”作业舱内留存的纸质科考日志本中。本数据集为该纸质日志的完整数字化转录版本，补充了通过船舶实时航行动态数据插值得到的经纬度坐标，以匹配日志中记录的作业起始时间。补充位置坐标的具体方法详见配套的eventlog_matchup.html文件。
event_number: 日志内唯一事件标识符，按照记录时序排列（通常但并非严格按时间先后）
event_type: 各研究项目自定义的编码，用于标识本次作业所布设的设备类型或采集的样本类别
event_type_prefix: 部分研究项目使用的非强制前缀字段，用于辅助标识事件类型
event_type_number: 各研究项目自定义的连续编号或字母数字组合编号，用于唯一标识单次设备布设或样本采集作业
station_number: 全航程通用的站位编号，用于标识航次规划阶段预先确定的标称经纬度位置
leg: 航次规划阶段预设的名义直线航段。本次航次规划为一系列大致呈南北向与东西向的测线断面，部分位置存在航线交点。航段以某一站位为起点，途经若干站位后抵达顶点站位，该顶点站位即为下一航段的起点。航段按顺序连续编号
waypoint: “极光南极号”船员、澳大利亚南极署（Australian Antarctic Division，AAD）技术支持人员与研究人员用于标识航程目标经纬度位置的GPS航点。部分航点与站位编号相对应
start_date_utc: 本次作业的协调世界时（UTC）起始日期
start_time_utc: 本次作业的协调世界时（UTC）起始时间
start_lat_deg: 作业开始时船舶所在纬度的整度数部分
start_lat_min: 作业开始时船舶所在纬度的弧分部分
start_lat_dec_deg: 作业开始时船舶所在纬度的十进制度数
start_lon_deg: 作业开始时船舶所在经度的整度数部分
start_lon_min: 作业开始时船舶所在经度的弧分部分
start_lon_dec_deg: 作业开始时船舶所在经度的十进制度数
end_date_utc: 本次作业的协调世界时（UTC）结束日期
end_time_utc: 本次作业的协调世界时（UTC）结束时间
end_lat_deg: 作业结束时船舶所在纬度的整度数部分
end_lat_min: 作业结束时船舶所在纬度的弧分部分
end_lat_dec_deg: 作业结束时船舶所在纬度的十进制度数
end_lon_deg: 作业结束时船舶所在经度的整度数部分
end_lon_min: 作业结束时船舶所在经度的弧分部分
end_lon_dec_deg: 作业结束时船舶所在经度的十进制度数
remarks: 研究人员填写纸质科考日志时留下的注释与备注信息
transcribe_comments: 日志数字化转录过程中，转录人员添加的注释与备注信息
utc: 本次作业的协调世界时（UTC）起始日期与时间
start_lat_dec_deg_interp: 通过船舶实时航行动态数据插值得到的作业开始时船舶所在纬度的十进制度数
start_lon_dec_deg_interp: 通过船舶实时航行动态数据插值得到的作业开始时船舶所在经度的十进制度数