Digital Terrain Model 1 (DGM1)

The data of the Digital Terrain Model 1 (DGM1) with 1 m grid are derived from laser scan data and photogrammetric evaluations (image correlation). The position accuracy of the laser scanning process is <=30 cm. The height accuracy corresponds to ± 0.2 m. The DGM1 currently serves as “output DGM” for the derivation of digital terrain models 5, 10, 25 and 50 (DGM5, DGM25, DGM50). The Digital Terrain Model 1 was obtained using the aircraft-assisted laser scanning process. Here, 3 to 4 measuring points were generated per square metre. The coordinate dimension of DGM data is 3D.

本数据集为1米格网的数字地形模型1（Digital Terrain Model 1，DGM1）数据，其源自激光扫描数据与采用影像相关技术的摄影测量解译成果。该数据依托的激光扫描工序点位精度不超过30厘米，高程精度为±0.2米。当前DGM1作为输出型数字地形模型，用于派生DGM5、DGM10、DGM25与DGM50等数字地形模型。数字地形模型1通过机载激光扫描技术获取，每平方米可生成3至4个测量点。DGM数据的坐标维度为三维。