Water plant cover IJsselmeer area — wireweed — 2020

Water plant cover IJsselmeer area. The water plant cover in the IJsselmeer area is monitored every three years. That is to say, in a three-year cycle in each part of the area, water plant cover shall be identified: in 2016 in the Markermeer and IJmeer, in 2017 in the IJsselmeer, and in 2018 in the edge lakes. NB: the Veluwemeer was not area-covered in 2018, but in a limited number of locations.For every year there is a dataset per species of aquatic plants found and a dataset with the total coverage present. These datasets are interpolated data. In addition, there is a dataset per year with the (point) locations of the field observations.In these datasets information from the years 2011 to 2018. Overall, the zone of 0-3 meters depth is calibrated. See the “Punts map field observations” layer for a view of the measuring points. Watch out! Aquatic plants can also occur outside the serrated zone.艾瑟尔湖（IJsselmeer）区域水生植物覆盖数据集。本数据集针对艾瑟尔湖区域的水生植物覆盖状况每三年开展一次周期性监测。具体而言，区域各片区按三年周期依次完成水生植物覆盖度普查：2016年覆盖马克米尔湖（Markermeer）与艾米尔湖（IJmeer），2017年覆盖艾瑟尔湖本体，2018年覆盖沿岸湖泊。注：2018年韦卢韦梅尔湖（Veluwemeer）未开展全区域普查，仅在有限点位进行观测。每年度均包含两类数据集：其一为对应观测到的水生植物物种数据集，其二为区域总覆盖度数据集，上述数据集均为插值处理后的数据。此外，每年度还附带一套野外观测（点位）坐标数据集。本数据集涵盖2011年至2018年的观测资料。整体而言，0至3米水深区间的观测数据已完成校准。可通过"Punts map field observations"图层查看测点位分布。注意！水生植物也可能出现在锯齿状划定的监测区域之外。