Fishing Activities And Trajectories For 2 Fishing Vessels

This data set provides the pseudo-positions in space and time of two fishing vessels and the associated activities (fishing, cruising, stopped, recorded by an on board observer). It supports the analyses provided in a paper published in Methods in Ecology and Evolution and the methods of the R package m2b (https://cran.r-project.org/package=m2b). For privacy concerns, original latitude, longitude, time and vessels id were modified. Spatial data were scaled and centred to a fictional position (R'lyeh position, Lovecraft 1928) keeping the relative geometry unchanged (acceleration, time between two positions....). Time and vessel id were modified in the same manner, keeping the relative properties of the tracks unchanged (time succession, different vessel id...). Vessel id and time are purely fictional and follow the historical context proposed by Lovecraft (1928) in the R'lyeh surroundings. Again, if the absolute spatial and temporal description of the fishing track were changed, their relative mathematical properties are conserved and can support behaviour detection based on relative movement analysis. For the data_vessel.csv file (csv file with header), the variables are x : pseudo longitude y : pseudo latitude t : pseudo time in year-month-day hour:minutes:second format b: fishing activity, namely "fishing", "cruising", "stopped" id: unique id by vessels (fictional names). <br> Reference H. P. Lovecraft, "The Call of Cthulhu" (1928)本数据集提供了两艘渔船在时空维度下的伪位置，以及对应的作业活动（捕捞、巡航、停泊，由船载观察员记录）。本数据集可支持发表于《Methods in Ecology and Evolution》（生态学与进化方法）的一篇论文中的分析，以及R包m2b（https://cran.r-project.org/package=m2b）的相关方法实现。出于隐私保护需求，原始的纬度、经度、时间及渔船ID均已完成脱敏处理。空间数据被缩放并中心化至虚构位置拉莱耶（R'lyeh），出自洛夫克拉夫特（Lovecraft）1928年的作品，且保留了相对几何关系不变，包括加速度、两位置间的时间间隔等信息。时间与渔船ID亦以相同方式进行修改，保留了航行轨迹的相对属性，如时间序列、不同渔船ID标识等。渔船ID与时间均为虚构内容，遵循洛夫克拉夫特1928年作品中拉莱耶周边的设定背景。即便捕捞轨迹的绝对时空描述已被修改，其相对数学特性仍得以保留，可支持基于相对运动分析的行为检测。 针对data_vessel.csv文件（带表头的CSV格式文件），其变量说明如下： x：伪经度 y：伪纬度 t：伪时间，格式为年-月-日 时:分:秒 b：捕捞作业活动，取值为捕捞（fishing）、巡航（cruising）、停泊（stopped） id：渔船唯一标识符（虚构名称） 参考文献 H. P. 洛夫克拉夫特，《克苏鲁的呼唤（The Call of Cthulhu）》（1928）