Current Height file Netherlands (AHN) WCS

The Current Height File Netherlands (AHN) is the digital height map for the whole of the Netherlands. It contains detailed and precise height data with a minimum of 10 height measurements per square meter. Ahn is a collaboration of the provinces, government and water boards. The height is measured with laser altimetry: a technique in which a plane with a laser beam scans the Earth’s surface. The current AHN is version 4. This version was obtained for the years 2020, 2021 and 2022.For more information on the AHN see https://ahn.nl.

These WCS contain the AHN grid files with a resolution of 0.5 meters. A distinction was made between the DTM and the DSM. The DTM is intended as a ground level file, where all points classified as “moving ground” have been re-sampled to a grid based on a Squared IDW method. The DSM is intended as a raw stock, where all points except those classified as “water” have been re-sampled into a grid based on a Squared IDW method.

荷兰现行高程文件（AHN）是覆盖荷兰全境的数字高程地图。它包含详实精准的高程数据，每平方米至少包含10组高程测量值。AHN由荷兰各省、政府及水务管理部门联合打造。其高程数据通过航空激光测高技术获取：该技术借助搭载激光束的飞机扫描地球表面。现行AHN为第4版，该版本的数据采集覆盖2020、2021及2022年。如需了解AHN的更多信息，请访问https://ahn.nl。

本批WCS包含分辨率为0.5米的AHN网格文件。数据集分为数字地形模型（DTM）与数字表面模型（DSM）两类。其中DTM为地面高程文件，所有被归类为“移动地表”的点位均通过平方反距离加权（Squared IDW）方法重采样生成网格数据。DSM则作为原始数据集，除被归类为“水体”的点位外，其余所有点位均通过平方反距离加权（Squared IDW）方法重采样生成网格数据。