Elevation file Oosterschelde 2007

Height model of the plates in the Oosterschelde in the form of a grid with a resolution of 2 meters where the height value is recorded in meters. On behalf of dir Zeeland, the Rogge Plate has been reduced by 10 cm A digital height model (DHM) is a file in which the height is displayed according to a regular, rectangular grid. Each cell of the grid (also called a grid cell) gets a height value. This height is calculated from the surrounding laser points of the filtered base file. The technique used for this purpose is a so-called weighted average interpolation. More information and explanations about the interpolation can be found in the manual on the grids of the AHN at www.ahn.nl. If there are no laser points near a grid cell, the cell remains empty (the cell gets a nodata value). Important to know is that the value of a 2x2 meter grid cell is calculated from multiple laser points (the number depends on the point density of the base file). As a result, the influence of the measurement noise and outliers decreases and a slight degree of flattening occurs. For further information see Quality Document奥斯特谢尔德国湾（Oosterschelde）区域海床板块的高程模型采用分辨率为2米的网格形式，高程值以米为单位记录。 受泽兰省（Zeeland）主管部门委托，罗格板块（Rogge Plate）的高程已被下调10厘米。 数字高程模型（Digital Height Model, DHM）是一种依据规则矩形网格展示高程信息的数据文件。网格中的每个单元格（亦可称为网格单元）均对应一个高程值，该值由过滤后的原始数据文件中的周边激光点云计算得到，所用插值技术为加权平均插值法。有关该插值方法的更多详细说明，请参阅荷兰通用高程数据库（AHN）的网格手册，网址为www.ahn.nl。若某网格单元格周边无可用激光点云，则该单元格将保留无数据值（nodata）。 需特别说明的是，2米×2米的网格单元高程值由多个激光点云计算得到（具体数量取决于原始数据文件的点云密度），此举可降低测量噪声与异常值的影响，但同时会产生轻微的高程平坦化现象。 更多信息请参阅质量文档。