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The new methods of dense DTM creation in PHOTOMOD Andrey Sechin Scientific Director, Racurs

13 th International Scientific and Technical Conference From Imagery to Map: Digital Photogrammetric Technologies. The new methods of dense DTM creation in PHOTOMOD Andrey Sechin Scientific Director, Racurs. September 20 13 , Fontainebleau, France. DEM, DTM, DSM, nDSM.

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The new methods of dense DTM creation in PHOTOMOD Andrey Sechin Scientific Director, Racurs

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  1. 13th International Scientific and Technical Conference From Imagery to Map: Digital Photogrammetric Technologies The new methods of dense DTM creation in PHOTOMOD Andrey Sechin Scientific Director, Racurs September 2013, Fontainebleau, France

  2. DEM, DTM, DSM, nDSM DEM, DTM have different definitions in different countries. In Russian (по-русски) ЦМР, ЦМП DEM & DTM - bare earth terrain. DSM include tree canopy & buildings.nDSM = DSM - DTM

  3. PHOTOMOD. Different models (depending on algorithm) Different models for Novokuznetsk city GeoEye-1 stereopair (GSD 0.5m) • Automatic DSM (old cross-correlation algorithm) with filtering buildings and trees • Automatic DSM (old cross-correlation algorithm) • 3D semi-automatic model (with manual stereo vectorization)

  4. Local algorithms of DTM creation Local algorithms • Memory efficient • Fast • Subpixel accuracy in “smooth” regions • Problems with periodic structures and poorly textured regions • Big problem with discontinuities on images

  5. Global algorithms of DTM creation Global algorithms • Global energy minimization • Take into account discontinuities and hidden surfaces • Not memory efficient • Still require filtering and smoothing in the end of algorithm • Semi Global Matching (SGM) • Graph-cuts • Simple Tree • Iterative- deformation method (RACURS) E = E(data) + E(smooth)

  6. PHOTOMOD: iterative deformation method (IDM) • All images are taken into account simultaneously • Memory efficient • Image pyramid hierarchy is used for speed and reliability • Image resection is used to calculate occlusions • Still requires filtering and smoothing on the final step

  7. Local vs Global method CrossCorrelation SGM and Iterative deformation methods

  8. SGM example Stereopair and disparity map

  9. IDM: GeoEye example Cross Correlation IDM

  10. IDM: Pleiades example

  11. IDM: Pleiades example

  12. IDM: DMC aerial example GSD = 6 cm

  13. IDM: DMC aerial example GSD = 6 cm

  14. IDM UltraCam example GSD = 7cm RMS difference between LIDAR and DSM – 21 cm

  15. IDM UltraCam example

  16. IDM UltraCam example

  17. Thank you for attention

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