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LIDAR vs Photogrammetry?

LIDAR vs Photogrammetry?. Lewis Graham GeoCue Corporation 9668 Madison Blvd., Suite 202 Madison, AL 35758 256-461-8289 lgraham@geocue.com www.geocue.com. The Fight is On!!. Nomenclature - DSM. First Reflectance Surface. Nomenclature - DTM. “Bare” Earth. Why LIDAR?.

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LIDAR vs Photogrammetry?

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  1. LIDAR vs Photogrammetry? Lewis Graham GeoCue Corporation 9668 Madison Blvd., Suite 202 Madison, AL 35758 256-461-8289 lgraham@geocue.com www.geocue.com

  2. The Fight is On!! Ohio UAS Test Center - LIDAR vs Photogrammetry

  3. Nomenclature - DSM First Reflectance Surface Ohio UAS Test Center - LIDAR vs Photogrammetry

  4. Nomenclature - DTM “Bare” Earth Ohio UAS Test Center - LIDAR vs Photogrammetry

  5. Why LIDAR? • The original primary goal was to directly collect accurate digital elevation data at very high speeds • Primary initial goal was rapid/accurate floodplain mapping • Since its inception, the role of LIDAR has expanded to include: • LIDAR “Images” for direct true ortho generation • Extraction of data that is very difficult via photography (e.g. Transmission Line modeling) • Building extraction • 3D asset collection • General purpose mapping Ohio UAS Test Center - LIDAR vs Photogrammetry

  6. Why PCDSM?(Photo-Correlated Digital Surface Models) • The original primary goal was to automatically derive accurate digital elevation data at very high speeds • Primary driver was “one source” orthophoto generation • Since its inception, the role of PCDSM has expanded to include: • 3D Visualization • Building extraction • 3D asset collection • General purpose mapping Ohio UAS Test Center - LIDAR vs Photogrammetry

  7. iSTAR True Ortho (1999) Ohio UAS Test Center - LIDAR vs Photogrammetry

  8. Photo-Correlated Digital Surface Models Ohio UAS Test Center - LIDAR vs Photogrammetry

  9. High X, Y Spatial Resolution Ohio UAS Test Center - LIDAR vs Photogrammetry

  10. But Axial Depth is Derived At least two images from different locations must see the same object space point Ohio UAS Test Center - LIDAR vs Photogrammetry

  11. Spatial Filtering by Design Ohio UAS Test Center - LIDAR vs Photogrammetry

  12. Correlation Noise Ohio UAS Test Center - LIDAR vs Photogrammetry

  13. Voids Trees Voids Robert Bussard Occlusion, shadows, other correlation failures Ohio UAS Test Center - LIDAR vs Photogrammetry

  14. Eyeball Aliasing PCDSM – Color by Z PCDSM - RGB Ohio UAS Test Center - LIDAR vs Photogrammetry

  15. No Ground… Ohio UAS Test Center - LIDAR vs Photogrammetry

  16. LIDAR Ohio UAS Test Center - LIDAR vs Photogrammetry

  17. LIDAR directly measures X, Y ,Z(sort of…) Ohio UAS Test Center - LIDAR vs Photogrammetry

  18. Only a single ray required Ohio UAS Test Center - LIDAR vs Photogrammetry

  19. Modern LIDARs can detect Multiple Returns & Waveform Ohio UAS Test Center - LIDAR vs Photogrammetry

  20. Laser Return Intensity Corridor mapper  1.541 microns Wide area mapper  1.064 microns Ohio UAS Test Center - LIDAR vs Photogrammetry

  21. Optech Gemini Ohio UAS Test Center - LIDAR vs Photogrammetry

  22. Aliasing is common Spatial filtering must be configured by the operator - Usually not understood/considered in flight planning Ohio UAS Test Center - LIDAR vs Photogrammetry

  23. Comparing correlators Ohio UAS Test Center - LIDAR vs Photogrammetry

  24. ~50 Image Mosaic Ohio UAS Test Center - LIDAR vs Photogrammetry

  25. Comparing Contours Lower Noise Higher Noise Ohio UAS Test Center - LIDAR vs Photogrammetry

  26. Flat surface noise Ohio UAS Test Center - LIDAR vs Photogrammetry

  27. LIDAR vs PCDSM Ohio UAS Test Center - LIDAR vs Photogrammetry

  28. Comparison Factors LIDAR Ohio UAS Test Center - LIDAR vs Photogrammetry

  29. Optimal Uses LIDAR (1) Excellent if completely illuminated. Poor in shadows (2) Both have advantages/disadvantages. We are investigating. Ohio UAS Test Center - LIDAR vs Photogrammetry

  30. And the winner is… There is no winner. They are completely different technologies with little overlap in applicability Ohio UAS Test Center - LIDAR vs Photogrammetry

  31. Thank You! Ohio UAS Test Center - LIDAR vs Photogrammetry

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