Federal Agency for Nature Conservation: Porpoise Monitoring Dissemination Single Years (WMS)

This service provides information on the population density of porpoises in the German offshore areas based on a 10x10 km grid (EU-GRID). The density [individuals/km²] is determined for each grid cell by adding the individual number of counting points within the respective grid cell and dividing it by the sum of the effort at the counting points. Individual layers show divided by season (March — May: Spring; June — August: Summer; September — November: Autumn; December — February: Winter) the distribution of porpoises in the respective year. In addition to porpoise density, the density of the sighted juveniles is also determined. A more detailed description of the methodology can be found in the monitoring reports of the BfN (https://www.bfn.de/wirbeltiere) or in a summary at http://www.wal-und-mensch.de/wum2006/gilles.php. The data are based on the pig whale recordings carried out within the framework of the BfN monitoring programme.本服务基于10×10公里网格（EU-GRID）提供德国近海区域的鼠海豚种群密度信息。每个网格单元的密度[单位：个体/平方公里]通过统计对应网格单元内所有计数点的个体总数，除以该些计数点的总采样投入计算得出。针对各季节分别生成单独图层：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，用于展示对应年份鼠海豚的分布情况。除鼠海豚种群密度外，本次计算还同步给出目击幼崽的种群密度。有关方法学的详细说明可参阅德国联邦自然保护局（BfN）的监测报告（https://www.bfn.de/wirbeltiere），或参见http://www.wal-und-mensch.de/wum2006/gilles.php 中的综述内容。本数据集基于BfN监测计划框架内开展的鼠海豚观测记录构建。