Ensemble Digital Terrain Model (EDTM) of the world

Layers include: Ensemble Digital Terrain Model (EDTM) in 250-m resolution. Unit is in metre(m) and precision is in decimetre (dm). Maps are downscaled from 30-m resolution to 250-m in order to fit the size limit. We provide 30-m EDTM and its standard deviation as links: 30-m EDTM https://s3.eu-central-1.wasabisys.com/openlandmap/dtm/dtm.bareearth_ensemble_p10_30m_s_2018_go_epsg4326_v20230221.tif Standard deviation https://s3.eu-central-1.wasabisys.com/openlandmap/dtm/dtm.bareearth_ensemble_std_30m_s_2018_go_epsg4326_v20230221.tif Derived using ALOS AW3D, GLO-30, MERITDEM, and national DTMs. We derived a lower 10% quantile from all maps. In order to create bare earth data, we used canopy height (canopy height > 2m) and standard deviation (sd > 6m) to mask building and forest in AW3D and GLO-30. Practical processing is written here in Python. To access and visualize maps use: OpenLandMap.org If you discover a bug, artifact or inconsistency, or if you have a question please use some of the following channels: Technical issues and questions about the code: https://gitlab.com/openlandmap/global-layers/-/issues General questions and comments: https://disqus.com/home/forums/landgis/ All files internally compressed using "COMPRESS=DEFLATE" creation option in GDAL in Cloud Optimised GeoTiff (COG). File naming convention: dtm.bareearth = variable: digital terrain model (m), bare earth ensemble = determination method: ensemble of mutli-source dsm and dtm p10/std = aggregation/statistics method: 10th percentile / standard deviation 250m = spatial resolution / block support: 250 m, s = vertical reference: at surface, go = bounding box: global land without Antarctica epsg.4326 = ESPG code: epsg.4326 v20230221 = version code: creation date 20230221本数据集包含250米分辨率的集成数字地形模型（Ensemble Digital Terrain Model，EDTM），其单位为米（m），精度可达分米（dm）。为适配尺寸限制，该地图从30米分辨率降采样至250米。我们提供了30米分辨率EDTM及其标准差的下载链接： 30-m EDTM https://s3.eu-central-1.wasabisys.com/openlandmap/dtm/dtm.bareearth_ensemble_p10_30m_s_2018_go_epsg4326_v20230221.tif Standard deviation https://s3.eu-central-1.wasabisys.com/openlandmap/dtm/dtm.bareearth_ensemble_std_30m_s_2018_go_epsg4326_v20230221.tif 本数据集基于ALOS AW3D、GLO-30、MERITDEM及国家数字地形模型（Digital Terrain Model，DTM）数据推导生成。我们从所有原始地图中提取了下10%分位数。为生成裸地地形数据，我们通过冠层高度（冠层高度>2米）与标准差（sd>6米）对AW3D和GLO-30数据中的建筑与森林区域进行掩膜去除。具体的处理流程已通过Python代码实现。 若需访问并可视化地图，请访问OpenLandMap.org。 若您发现数据存在错误、伪影或不一致性，或有相关疑问，请通过以下渠道反馈： 代码相关技术问题与疑问：https://gitlab.com/openlandmap/global-layers/-/issues 通用问题与建议：https://disqus.com/home/forums/landgis/ 所有文件均采用GDAL的"COMPRESS=DEFLATE"创建选项进行内部压缩，格式为云优化GeoTIFF（Cloud Optimised GeoTiff，COG）。文件命名规则说明如下： dtm.bareearth：变量为数字地形模型（Digital Terrain Model，DTM），即裸地地形 ensemble：确定方法，即多源数字表面模型与数字地形模型的集成结果 p10/std：聚合/统计方法，即10%分位数/标准差 250m：空间分辨率/区块支撑范围：250米 s：垂直参考基准：地表基准 go：边界范围：全球陆地（不含南极洲） epsg.4326：EPSG编码：epsg.4326 v20230221：版本编码：生成日期20230221