1. Using DSS digital camera images and DТM from ALS50 laser scanner for creating orthomosaics in PHOTOMOD system Dmitry V. Кochergin (Racurs), Maxim V. Skorniakov (Mosgiprotrans)

2. On-board data + software Digital aerial images Exterior orientation parameters DTM from Laser scanner TerraScan software PHOTOMOD software

3. PHOTOMOD 4.1 – automatic interior orientation of images from the digital camera

4. PHOTOMOD 4.1 – importing exterior orientation parameters from Applanix format

5. PHOTOMOD 4.1 – block layout creation from the exterior orientation parameters

6. PHOTOMOD 4.1 – automatic tie points measurements using the block layout

7. PHOTOMOD 4.1 – import of laser scanner data from LAS format

8. + automatic tie points measurements + automatic tie points measurements + ground control points Digital aerial images, Exterior orientation parameters, DTM from Laser scanner Orthomosaics of different accuracy Input, processing, output direct georeferencing block adjustment

9. reconstruction of existing highways and railroads and projecting new ones aerial survey: DSS camera (focal length = 35 mm) Applanix ALS 50 Flight height 300 m Air vehicle Mi-8 helicopter Total length 180 кm Aerial survey productivity 150 km per day Velocity 120-150 km\h one of the projects in 2006: output products: DEM Orthomosaics of 1:1000 scale 3D vector objects MOSGIPROTRANS Co. is the biggest Russian institute of exploration and projecting of transportation objects

10. How does it look like

11. Calibration of DSS-ALS50 system was done in accordance with standard Applanix technology on the special polygon

12. Project geodetic works GCPs (also for more precise field survey and calculation of accurate local datum parameters) Tacheometry Base stations for ALS and DSS (Applanix postprocessing) “Moscow” coordinate system

13. PHOTOMOD 4.1. One of project strips (35 images)

14. PHOTOMOD 4.1. Automatic interior orientation

15. PHOTOMOD 4.1. Block layout after importing Applanix data

16. PHOTOMOD 4.1. Automatic tie points measurements

18. PHOTOMOD 4.1. Block adjustment

19. TerraScan. All points ~8 points / sq.m ~720 000 points / image

20. TerraScan. “Ground” points ~2 points / sq.m ~180 000 points / image

21. TerraScan. “Model key” points ~0.2 points / sq.m ~18 000 points / image

22. PHOTOMOD 4.1

23. PHOTOMOD 4.1 Laser scanner data The biggest LAS file imported to PHOTOMOD was about 5 000 000 points

24. PHOTOMOD 4.1

25. PHOTOMOD 4.1 DEM from laser scanner data

27. PHOTOMOD 4.1 Orthomosaic

29. + automatic tie points measurements + automatic tie points measurements + ground control points orthomosaic accuracy by check points (max residual) 30 cm25 cm15 cm Digital aerial images, Exterior orientation parameters, DEM from Laser scanner Accuracy and productivity  Total time for 35 images project processing is about 10 hours direct georeferencing block adjustment

30. Thank you for attention!