Vessel Density Grid 2014

This dataset contains the average weekly shipping density for the whole of the UK at a 2km grid resolution. For 2014, AIS datasets were sampled from the first seven days of each month, commencing with January,at monthly intervals.The total value for all 12 weeks were divided by 12 to determine the weekly average for each vessel group, therefore decimal values may occur for certain cells. The weekly average of all vessel groups were multiplied by 52 to provide the estimated annual average. Please note that the grid used to calculate this dataset is not consistent with that of 2011, 2012 and 2015 data. The data will be recalculated to provide consistent data as soon as possible.
The field headings in the attribute table are as follows:
0 - Unknown Vessels
1 - Non-Port service craft
2 - Port service craft
3 - Vessels engaged in dredging or underwater operations
4 - High Speed Craft
5 - Military or Law enforcement
6 - Passenger
7 - Cargo
8 - Tankers
9 - Fishing vessels
10 - Recreational vessels
Weekly_Ave - Weekly average of all vessels
Annual_Ave - Estimated annual density for all vessels

本数据集包含全英国范围内2公里网格分辨率下的周平均航运密度。2014年的自动识别系统（Automatic Identification System, AIS）数据集采样自每月的前7天，以月为间隔从1月起依次采样。将全部12周的总数值除以12，即可得到各船舶类别的周平均密度，因此部分网格单元的数值可能为小数。将所有船舶类别的周平均密度乘以52，即可得到全船舶类别的估算年度平均密度。请注意，本数据集所使用的网格与2011、2012及2015年数据的网格并不统一，相关团队将尽快重新计算以生成标准统一的数据集。

属性表中的字段名称如下：
0 - 未知船舶
1 - 非港口服务艇
2 - 港口服务艇
3 - 从事疏浚或水下作业的船舶
4 - 高速船舶
5 - 军用或执法船舶
6 - 客运船舶
7 - 货运船舶
8 - 油轮
9 - 捕捞渔船
10 - 休闲游艇
Weekly_Ave - 所有船舶的周平均密度
Annual_Ave - 所有船舶的估算年度平均密度