Items | 3dsMax Traditional modeling | Oblique photogrammetry semi-automated human-computer interaction modeling | Onboard laser-scanned point clouds are modeled in conjunction with oblique photographic imagery |
Basic data | Large-scale digital line graphics, vertical photogrammetry images, and partial textures of figures obtained by manual field re-shooting. | Photogrammetry images, flight control data, ground control points, etc. | Airborne laser point cloud, oblique photogrammetry image, flight control data, ground control point, etc. |
Process flow | Manually determine the position of the figure in the 3dsMax with digital line graphics, manually generate white molds, process images, and fit textures. | Images of the top and sides of the figure are obtained through oblique photogrammetry, and only image modeling is used. | Multi-angle image fusion modeling of the top and side of the figure is obtained through on-board laser point cloud and oblique photogrammetry, and the point cloud generates structure and the image fits the texture. |
Production results | Most of them are patch structure data, that is mesh surface models. | 4D products can be generated, 3D real scene models. | 4D products can be generated, 3D real scene models. |
Production cycle | The cycle is long and inefficient, with less than one square kilometer per day. | Short cycle times, moderate efficiency, and human-machine interactive semi-automatic modeling. | The cycle time is long, the efficiency is high, the modeling is almost fully automated, and there is less manual intervention. |
Scene features | Artificially constructed digital and virtualized 3D scenarios. | The real scene digitizes the three-dimensional scene. But it is easily deformed and distorted by the occlusion position and hidden position of itself or foreign objects. | In the 3D real scene, the figure structure generated by the laser point cloud is accurate, and the texture mapping of the oblique image is clear. |
The process is cumbersome, the operation is complex, the degree of automated modeling is low, the time and experience of manual investment are more. | The process is simple, the degree of automated modeling is fast and efficient, and the workload of manual editing data is reduced. | The process is simple and the difficulty of operation is moderate. Most in-house workflows can be automated, but areas with poor aesthetic results require manual intervention to repair. |