Digital off-road model NW grid width 0.25 m — Schummerung-NO

A rubble is the plastic reproduction of the terrain shapes in a color or grayscale image. The spatial impression is created by lighting with an imaginary light source. Hd foaming is the visualisation of a high-resolution digital terrain model (DGM). One pixel in the debris image corresponds to 0.25 m x 0.25 m on the Earth’s surface. Objects such as buildings and vegetation are not represented, as the DGM describes the natural terrain shape of the earth’s surface. In the case of hd foam, the imaginary light source is located in the northwest. An elevation appears bright on the northwest slope and dark on the southeast slope. Layers are colored with medium brightness. This expresses how strongly the surface of the light source is facing. By means of DGM1 foam, the natural terrain shape can be represented very plastically. Possible uses include, for example, merging with other geobase and/or geospatial data (e.g. presentation with leisure information), as well as overlaying with digital topographic maps or digital orthophotos to create a plastic terrain impression. The data can also be used as a basis for spatial planning, geomorphological analyses, as well as the detection of terrain structures of historical buildings (e.g. Roman roads or fortified ramparts). Hd foaming is not available throughout NRW. It is available for parts of the country for which an airborne laser scanning measurement density of 4 points per square meter is available (see metadata information ‘Points per square meter’)地形浮雕图像（rubble）是基于彩色或灰度图像实现的地形形态立体复刻，其空间立体感通过虚拟光源照明构建。高清地形晕渲（hd foaming）是高分辨率数字地形模型（Digital Terrain Model，DGM）的可视化呈现形式。该晕渲图像（debris image）中的单个像素对应地表0.25米×0.25米的范围。由于数字地形模型仅描述地表自然地形形态，因此建筑、植被等地物不会在图像中体现。在高清地形晕渲中，虚拟光源位于西北方向，西北向坡面的高程区域会呈现高亮效果，东南向坡面则呈现暗调效果。各图层采用中等亮度配色，以此体现地表坡面与虚拟光源的朝向贴合程度。通过DGM1晕渲（DGM1 foam），可高度逼真地呈现自然地形形态。其应用场景包括：与其他地理基础数据及/或地理空间数据融合（如结合休闲娱乐信息进行可视化展示），与数字地形图或数字正射影像（digital orthophotos）叠加以生成具有立体视觉效果的地形呈现。该数据还可作为空间规划、地貌分析，以及历史建筑相关地形结构（如古罗马道路或防御工事壁垒）探测的基础数据。高清地形晕渲数据并非覆盖北莱茵-威斯特伐利亚州（NRW）全境，仅在该州满足机载激光扫描（airborne laser scanning）测量密度为每平方米4个点的区域提供该数据，详见元数据（metadata）信息‘每平方米点数’。