Fig. 1. Spatial distribution map of AW3D30 DEM， ICESat-2 and topographic factors in Henan Province

Fig. 2. Schematic diagram of ICESat-2 laser footprint offset

Fig. 3. Neuronal structure of LSTM

Fig. 4. Workflow of RF-LSTM Hybrid Model

Fig. 5. The relationship between AW3D30 DEM error and slope， aspect

Fig. 6. The relationship between AW3D30 DEM error and landform， land use

Fig. 7. Importance ranking of terrain factor variables based on RF

Fig. 8. The AW3D30 DEM after RF-LSTN Hybrid model improvement and difference before and after modification of AW3D30 DEM

Fig. 9. AW3D30 DEM Improvement results for different improvement models