Circalittoral hard substrate

Broad-scale habitat maps for the Baltic Sea have been produced in the EUSeaMap project in 2016. For German and Estonian marine areas, national (more accurate) datasets were used. German data included both substrate and light information (division into infralittoral/circalittoral). Estonian data included only substrate and the division into light regimes was obtained from the EuSeaMap data. Here, the habitat class “circalittoral hard substrate” includes classes “Rock and other hard substrate” and “Coarse substrate” of the original data, in the circalittoral zone. The original polygon maps have been converted to 1 km x 1 km grid. The scale of the substrate data used in broad-scale habitat maps varies from 1:250 000 to 1:1M (data from EMODnet Geology). Coarser resolution data has been used in areas, where 1: 250 000 substrate data has not been available. Due to different scales used, the habitat classes may show different sized patterns in different areas.2016年，EUSeaMap（欧盟海图）项目完成了波罗的海大范围生境地图的编制工作。针对德国与爱沙尼亚海域，研究采用了精度更高的国家级数据集。德国数据集涵盖底质（substrate）与光照信息，并将区域划分为潮下浅带（infralittoral）与潮下深带（circalittoral）两类；爱沙尼亚数据集仅涵盖底质信息，其光照分区数据则取自EUSeaMap项目的数据集。 本数据集的“潮下深带硬质底质（circalittoral hard substrate）”生境类，整合了原始数据中潮下深带范围内的“岩石及其他硬质底质”与“粗粒底质”两个分类。原始的多边形矢量地图已被转换为1km×1km的网格单元。 本次大范围生境地图所使用的底质数据比例尺介于1:250 000至1:1M之间，数据源自EMODnet Geology（欧盟海洋地质观测网）。在未获取1:250 000比例尺底质数据的区域，均采用了分辨率更低的数据集。由于所采用的比例尺存在差异，不同区域的生境类斑块会呈现出不同的尺寸特征。