Fishing effort longlines 2009

This dataset describes fishing effort (hours/c-square) for longlines in 2009 based on VMS/Log book data processed by ICES Working Group on Spatial Fisheries Data (WGSFD). HELCOM requires spatially explicit information on fishing activity affecting the Baltic Sea marine ecosystem for policy purposes. In order to obtain this information a joint ICES/HELCOM/OSPAR data call was issued to relevant authorities of contracting parties to deliver information on fishing activity based on VMS/Log book data. The raw data was submitted to ICES and processed to advice data products by ICES Working Group for Spatial Fisheries (WGSFD) as requested by HELCOM. Processing of the raw data requires specific resources, knowledge and guarantee of anonymity for specific vessels, thus the process was done by ICES WGSFD following Conditions for VMS data use. In 2015 ICES collated Vessel Monitoring System (VMS) and logbook data received; data from Russia were not received. ICES provided to HELCOM advice as fishing abrasion pressure maps as well as fishing effort maps. HELCOM secretariat did the following processing to the data: - Conversion to ETRS89LAEA coordinate system - Added feature and attribute "Reported" to display unreported areas. Dataset attribute information: c-square: Unique reference of the c-square polygon mid_lat: latitude coordinate of the centroid of c-square inWGS84 decimal degrees mid_lon: longitude coordinate of the centroid of c-square inWGS84 decimal degrees Year: Year of fishing activity quarter: Quarter of the year, if applicable geargroup: Fishing gear group (Effort maps) SubsurfSAR: Subsurface swept area ratio (Intensity maps) SurfSAR: Surface swept area ratio (Intensity maps) Fishing_ho: Total fishing effort in hours within c-square (Effort maps) Reported: Yes=Reported data. No= No reported data (area that does not contain effort/intensity value due to lack of reported data.本数据集基于国际海洋考察理事会 (International Council for the Exploration of the Sea) 空间渔业数据工作组 (Working Group on Spatial Fisheries Data) 处理的船舶监测系统 (Vessel Monitoring System) 与日志数据，描述了2009年延绳钓渔业的捕捞努力量（单位：小时/平方千米格网，即c-square）。 波罗的海海洋环境保护委员会 (HELCOM) 出于政策制定需求，需获取捕捞活动的空间显性信息以支撑波罗的海海洋生态系统的相关政策工作。为此，ICES、HELCOM与奥斯陆和巴黎海洋环境保护委员会 (OSPAR) 联合向缔约方相关主管部门发起数据征集，要求提交基于VMS与日志数据的捕捞活动信息。 原始数据提交至ICES后，应HELCOM的要求，由ICES空间渔业数据工作组处理生成咨询用数据产品。原始数据的处理需要特定资源、专业知识，且需保障特定船舶的匿名性，因此该流程由ICES工作组按照《船舶监测系统数据使用规范》执行。 2015年，ICES整理了收集到的VMS与日志数据，但未获取到俄罗斯提交的相关数据。ICES向HELCOM提供了捕捞侵蚀压力地图及捕捞努力量地图作为咨询成果。 HELCOM秘书处对该数据开展了如下处理： - 转换至ETRS89LAEA坐标系 - 新增"Reported（已报告）"特征与属性，用于标注未报告区域。 数据集属性信息如下： c-square：平方千米格网多边形的唯一参考标识 mid_lat：以WGS84十进制度为单位的c-square质心纬度坐标 mid_lon：以WGS84十进制度为单位的c-square质心经度坐标 Year：捕捞活动所属年份 quarter：所属季度（如适用） geargroup：渔具组别（对应努力量地图） SubsurfSAR：水下扫海面积比（对应强度地图） SurfSAR：水面扫海面积比（对应强度地图） Fishing_ho：c-square范围内的总捕捞努力量（单位：小时，对应努力量地图） Reported："Yes"代表已报告数据；"No"代表无报告数据（指因缺乏上报数据而未包含努力量/强度值的区域）。