Density map Harbour Porpoise (uncorrected)

This service contains information on the population density of harbor porpoises in German Exclusive Economic Zone (EEZ) based on a 10x10 km grid (EU-GRID). Density [individuals/km²] is calculated for each 10x10 km grid cell by adding the number of individuals within the respective grid cell and dividing by the sum of the effort (area surveyed and period the area was sampled). Individual layers subdivided by season (March-May: spring; June-August: summer; September-November: fall; December-February: winter) show the distribution of harbor porpoises in the respective year. Direct comparability with the data in the BfN service "Porpoise monitoring distribution in individual years" is limited, since the current BSH service only used data collected using the digital flight observation technique.本数据集包含基于10×10千米网格（EU-GRID）的德国专属经济区（Exclusive Economic Zone，EEZ）内港湾鼠海豚（Harbor Porpoise）的种群密度数据。种群密度以[个体/平方千米]为单位，针对每个10×10千米网格单元，通过将对应网格内的个体总数除以该区域的调查工作量总和（含采样覆盖区域与采样时段）计算得出。各数据图层按季节细分（3月-5月为春季；6月-8月为夏季；9月-11月为秋季；12月-2月为冬季），用以展示对应年份港湾鼠海豚的分布情况。与BfN服务中"Porpoise monitoring distribution in individual years"数据集内的数据进行直接对比存在局限性，原因在于本次BSH数据集仅采用了数字化航空观测技术采集的数据。