Table 1
Information conducive to SAR 3D imaging
| Contents | Descriptions | Information |
| Target identification, semantic segmentation | Key focus targets such as buildings, bridges, oil tanks, vehicles, ships, and power facilities are identified. | Semantic information aids in selectively choosing more suitable methods and parameters for different targets, for example, artificial targets and natural features. |
| The segmentation process involves distinguishing between the identified targets and the background of natural features, as well as segmenting the areas occupied by individual instances of similar targets. | Target identification and instance/semantic segmentation also lay the foundation for subsequent extraction of spatial structural elements and other related tasks. | |
| Elevation inference | Inferring pixel heights by learning SAR images, such as top-bottom inversion and shadows, for example. | Providing a prior for height estimation reduces solution space in the height direction. |
| Large-scale spatial structures | Extract spatial structural elements, including line elements such as straight lines, curved lines, etc., and surface elements such as horizontal planes, vertical planes, etc., from the visual content of images and the initial point cloud in 3D imaging. | Providing prior information on 3D positions helps reduce the solution space in the elevation direction, facilitating the 3D imaging of overall structures. |
| Small-scale spatial structures | For complex targets where it is not possible to directly extract structural elements on the aforementioned large-scale structures, numerous local surface elements are extracted to constitute the complex structure. | Providing local position priors and constraints on correlation and continuity contributes to the three-dimensional imaging of fine structures. |
| Micron-scale microwave scattering elements | Identification and parameter inversion of microwave scattering mechanisms through the analysis of spatial-temporal-frequency-polarization multidimensional data. | Providing structural parameters of scattering mechanisms aids in the reconstruction of local fine three-dimensional structures. |
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