Fig. 1. Schematic of linear whiskbroom camera imaging

Fig. 2. Calculation process of iteration photogrammetry method

Fig. 3. Situation of iterative non-convergence of coordinate projection calculation. (a) α=θ; (b) α<θ

Fig. 4. Improved iterative calculation method. (a) Convergent situation; (b) non-convergent situation

Fig. 5. Basic principle of visual vector segmentation iterative calculation

Fig. 6. Flow chart of visual vector segmentation iterative calculation

Fig. 7. DEM thumbnails and DOM partial enlarged drawing in experimental area. (a) Plain; (b) hill; (c) mountain

Fig. 8. Four methods of imaging simulation results. (a),(b),(c) Result of ordinary iteration calculation method; (d),(e),(f) result of improved iteration calculation method; (g),(h),(i)result of partial exhaustion method; (j),(k),(l) result of visual vector segmentation iteration coordinate projection calculation method

Table 1. Calculation times of collinear condition equation required for different section intervals

Table 2. Information of simulated image experimental area

Table 3. Error statistical results of image coordinate calculated by visual vector segmentation iteration

Table 4. Iteration time statistical results of four methods