Gridded (1km) physical river characteristics for the UK v2

The 1 km x 1 km outflow drainage direction and catchment areas datasets are generated from a 50 m x 50 m resolution digital terrain: IHDTM (Integrated Hydrological Digital Terrain Model). Bankfull river widths on a 1 km x 1 km grid are generated using the OS MasterMap Water Network Layer width data in a regression relationship with catchment area and rainfall characteristics. The 1km × 1km gridded bankfull river depth dataset is generated using observed measurements from a range of sources in a regression relationship with catchment area and rainfall characteristics. Finally, the NRFA (National River Flow Archive) gauging station location dataset on a 1 km x 1 km grid is generated by identifying the location (easting, northing) on the catchment areas dataset that best represents the true gauging station location. An indication of the quality of these data is provided by the percentage error between the 1km-derived and the IHDTM catchment areas. See supporting information for more details.

1千米×1千米分辨率的径流流向数据集与汇水区数据集，均由50米×50米分辨率的数字地形模型IHDTM（Integrated Hydrological Digital Terrain Model，水文综合数字地形模型）生成。1千米×1千米网格的满岸河宽数据集，通过结合汇水区面积与降雨特征的回归关系，利用OS MasterMap水系图层的宽度数据构建生成。1千米×1千米网格的满岸河深数据集，则通过整合多源实测数据，结合汇水区面积与降雨特征的回归关系生成。最后，1千米×1千米网格的NRFA（National River Flow Archive，国家河流水文档案）测站位置数据集，通过在汇水区数据集中定位最贴合真实测站东向、北向坐标的点位生成。上述数据集的质量可通过1千米分辨率汇水区数据与原始IHDTM汇水区数据间的百分比误差进行表征。更多细节请参阅补充材料。