DTM 10 Terrain Model (UTM33) 2021

Digital terrain model over mainland Norway with heights in a grid of 10 x 10 meters. The terrain model is a grid model with a resolution (grid size) of 10 x 10 meters. This is a yearly version of DTM 10 as the dataset was at the end of 2021. Accuracy: ± 1 meter standard deviation in height in areas established in NDH ± 2 to 6 metres standard deviation in height in areas not yet established in NDH. Metadata file for DTM10 showing sites established in NDH can be downloaded. In the project National detailed elevation model, a nationwide detailed height model is established. In essence, detailed elevation data are established using laser scanning of approximately 230.000 km² of Norway’s land area. The new detailed height model also includes older, high-quality laser data in some areas. In addition, in some mountain areas without vegetation, elevation data is established using image matching. It is aerial images from the Circular Photography that are used for the image matching. By the end of 2021, everything will be laser scanned, a total of 230 000 km². Some work remains to be done with control of the latest projects, so these are not included in the 2021 edition of the dataset. Laser scanning is carried out with a minimum of 2 points per square meter. In selected areas, the higher point isness; 5 points per square meter. The project is ongoing in the period 2016 – 2022. The target is a nationwide height model with resolution 1x1 meter. As new data are established in the National Detailed Altitude Model (hoydedata.no), the national elevation models are updated. The data is desampled and updated DTM 10. An annual version of DTM 10 will be established as the data set was at the end of 2021. These are the files that can be downloaded here. (In the past, similar datasets have been published as it was at the end of 2020, 2019 and 2018). At any time, the latest version of DTM 10 can be obtained as a ready-made export of the nationwide terrain model from hoydedata.no. The basis for the national elevation model at heightdata.no is a previously established nationwide terrain model DTM 10. In a transition phase, this will still be available for download via Geonorge.Considerable work has been done in quality control of the old model, especially considering a good transition between land and sea/sea, but it is no longer updated and will therefore have a poorer accuracy than the DTM 10 model offered from altitude data.no. DTM 10 from hoydedata.no is automatically produced and reflects the quality of the detailed altitude data that is at all times part of the National Detailed Altitude Model. In essence, this is good data, but some height errors may occur. This is especially true of highlights in lakes and glaciers, here there may be some points with the wrong height. In many cases, water surfaces do not have the same height over the entire water. There may also be less height gaps between different projects.挪威本土范围内的数字地面模型（Digital Terrain Model, DTM），其高程数据采用10米×10米的格网存储。该地形模型为格网模型，分辨率（格网尺寸）为10米×10米。本数据集为对应2021年末状态的DTM 10年度版本。 精度说明： 在已纳入国家详细高程模型（National Detailed Elevation Model, NDH）的区域，高程标准差为±1米； 在尚未纳入NDH的区域，高程标准差为±2至6米。 可下载包含NDH已覆盖区域信息的DTM 10元数据文件。 在国家详细高程模型项目中，构建了全国范围的精细化高程模型。项目核心是通过激光扫描覆盖挪威约23万平方千米的陆地面积以获取精细化高程数据。新型精细化高程模型还纳入了部分区域已有的高质量老旧激光扫描数据。此外，在部分无植被覆盖的山区，采用影像匹配技术获取高程数据，所用影像来自环形航空摄影数据集。 截至2021年末，全域23万平方千米陆地均已完成激光扫描。但部分最新项目的控制点核验工作仍未完成，因此未纳入本2021版数据集。 激光扫描的点云密度不低于每平方米2个点；在部分选定区域，点云密度更高，可达每平方米5个点。 本项目实施周期为2016年至2022年，最终目标是构建分辨率为1米×1米的全国范围高程模型。 随着国家详细高程模型（hoydedata.no）持续更新新增数据，全国高程模型也将同步更新。本数据集为经降采样与更新后的DTM 10产品。本机构会按照每年末的数据集状态发布DTM 10年度版本，本次可供下载的即为2021年末状态的对应版本。（过往曾发布过2020、2019及2018年末状态的同类数据集。） 用户可随时从hoydedata.no获取最新版DTM 10，该版本为全国地形模型的现成导出产品。 hoydedata.no平台上的全国高程模型以早前构建的全国范围地形模型DTM 10为基础。在过渡阶段，该旧版模型仍可通过Geonorge平台下载。研究团队已针对旧版模型开展了大量质控工作，尤其注重实现海陆边界的平滑过渡，但该模型已停止更新，因此其精度将低于hoydedata.no平台提供的DTM 10模型。 hoydedata.no平台的DTM 10产品为自动生成，其精度与当前纳入国家详细高程模型的精细化高程数据质量保持一致。总体而言，该数据集质量优异，但仍可能存在少量高程误差：例如湖泊与冰川中的高亮区域可能存在部分高程错误；多数水域的高程并非全域统一；不同项目区块之间也可能存在少量高程衔接断层。