Density map Harbour Porpoise (uncorrected) - WMS

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（EEZ）内港湾鼠海豚（harbor porpoises）的种群密度信息。种群密度以[个体/平方千米]为单位，计算方式为：将对应网格单元内的个体总数除以该单元的调查努力量（即调查覆盖区域与采样时段的总和）。按季节划分的多个独立图层（3-5月为春季、6-8月为夏季、9-11月为秋季、12月至次年2月为冬季）可展示对应年份港湾鼠海豚的分布情况。由于当前BSH服务仅采用数字飞行观测技术采集的数据，因此与BfN服务"各年度鼠海豚监测分布（Porpoise monitoring distribution in individual years）"中的数据进行直接对比存在一定局限性。