Data on porpoise encounter durations (from CPODs) for analyses of responses of porpoises to piling activity

Data on porpoise encounter durations (from CPODs) for analyses of responses of porpoises to piling activity (see Fig. 7i,l). Filename = “porpoise encounter durations CPOD data 2013-2014.txt” Fourteen columns = Location, Year, Durations, Date & Time, Hour, Latitude, Longitude, Line_sight, Dist_impact, Julday, Block, Impact, Vibration, Area. Durations is the duration (s) of each porpoise encounter that started between 06:00 to 18:00. Date & Time is the start time of each encounter. Hour is the hour in which each encounter started. Line_sight indicates whether or not a location is within line of sight of the piling location (coded 1 or 0). Dist_impact is the minimum at-sea distance between each location and the piling location in meters. Julday is Julian day. Block is the year concatenated with Julian day, used as the grouping factor for the GEEs (at the larger temporal scale). Impact is coded as two levels: 1 (impact piling), 0 (no impact piling). Vibration is coded as two levels: 1 (vibration piling), 0 (no vibration piling). Area is coded as two levels: 1 (within the Cromarty Firth), 0 (outside the Cromarty Firth).本数据集包含源自CPOD的鼠海豚遭遇时长数据，用于分析鼠海豚对打桩活动的响应（详见图7i、l）。 数据集文件名为"porpoise encounter durations CPOD data 2013-2014.txt"。 该数据集共包含14列字段，依次为：Location（观测位置）、Year（年份）、Durations（遭遇时长）、Date & Time（开始日期与时间）、Hour（遭遇开始小时）、Latitude（纬度）、Longitude（经度）、Line_sight（可视范围标记）、Dist_impact（影响距离）、Julday（儒略日）、Block（分组因子）、Impact（打桩影响状态）、Vibration（打桩振动状态）、Area（海域区域）。 其中，Durations字段记录每日6:00至18:00间开始的每一次鼠海豚遭遇的时长，单位为秒（s）；Date & Time字段记录每一次遭遇的开始时间；Hour字段记录每一次遭遇开始的具体小时；Line_sight字段用于标记某一观测位置是否处于打桩位点的可视范围内，编码为1或0；Dist_impact字段记录各观测位置至打桩位点的最小海上距离，单位为米（m）；Julday字段为儒略日；Block字段由年份与儒略日拼接而成，作为广义估计方程（GEE，Generalized Estimating Equations）在更大时间尺度上的分组因子；Impact字段分为两个水平：1代表存在打桩影响，0代表无打桩影响；Vibration字段分为两个水平：1代表存在打桩振动，0代表无打桩振动；Area字段分为两个水平：1代表位于克罗马蒂湾（Cromarty Firth）范围内，0代表位于克罗马蒂湾范围外。