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Application of LiDAR Technology for GCP Determination in Papua Topographic Mapping Scale 1:50.000

Application of LiDAR Technology for GCP Determination in Papua Topographic Mapping Scale 1:50.000. Wildan Firdaus - 2011. LiDAR Photos. Bakosurtanal >> BIG Backgrounds Problems Solution Methodology Results Discussions Conclusions. Our Team. From Bakosurtanal into the BIG. beranda.

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Application of LiDAR Technology for GCP Determination in Papua Topographic Mapping Scale 1:50.000

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  1. Application of LiDAR Technology for GCP Determination in Papua Topographic Mapping Scale 1:50.000 Wildan Firdaus - 2011

  2. LiDAR Photos Bakosurtanal >> BIG Backgrounds Problems Solution Methodology Results Discussions Conclusions

  3. Our Team

  4. From Bakosurtanal into the BIG beranda

  5. BACKGROUND (1) • Bakosurtanal (now BIG) has responsibility to provide Topographic Map for all area in Indonesia at different scale • Bakosurtanal (now BIG) has many old aerial photos in Papua (photo scale 1:20.000) lanjut

  6. BACKGROUND (2) • Since topography of Papua is unchanged for last 20 years, it is possible to create Topographic Map at map scale 1:50.000 by using old aerial photograph data • Aerial photo data acquisition years: 1990 – 1996 beranda

  7. PROBLEMS • There is no Ground Control Point (GCP) on aerial photo • Aerial Triangulation (AT) need GCP • It is very expensive and inefficient to collect GCP by terrestrial survey since it is very large area and difficult to access some places in Papua beranda

  8. SOLUTION (1) • LiDAR (Light Detection and Ranging) is a latest technology in remote sensing • LiDAR provide elevation data at very high accuracy and density at a relatively short time for large area lanjut

  9. SOLUTION (2) • LiDAR combined with medium format digital camera to provide image data • It is possible to use LiDAR data for GCP determination on old aerial photo beranda

  10. LiDAR System (1) lanjut

  11. LiDAR System (2) lanjut

  12. LiDAR System (3) lanjut

  13. LiDAR System (4) beranda

  14. METHODOLOGY Aerial Photo AT Workflow LiDAR Workflow List of Coordinate Measurement - Digital Terrain Model - Ortho Image Bundle Adjustment GCP Determination List of GCP Coordinate Exterior Orientation lanjut

  15. LiDAR Workflow lanjut

  16. LIDAR FLIGHT PLAN

  17. AT Workflow beranda

  18. Pricking (1) • Pricking Transfer point from digital image LiDAR to Aerial Photo and then performed pricking on Diapositive lanjut

  19. Pricking (2)

  20. RESULT (1) • LiDAR Data Acquisition and Processing Digital Surface Model (DSM) Digital Terrain Model (DTM) Ortho Image 800 GCP Coordinates lanjut

  21. RESULT (2) • Aerial Triangulation (AT) RMS GCP RMS X = 2.867 m RMS Y = 3.102 m RMS Z = 0.864 m RMS requirement RMS XY ≤ 5 m RMS Z ≤ 2 m lanjut

  22. RESULT (3) • Aerial Triangulation (AT) Sigma Naught = 36,98 micron Sigma Naught requirement ≤ 30 micron beranda

  23. DISCUSSION (1) • LiDAR data can be generate to become DSM and DTM • LiDAR data result have good quality of precision that fulfill the specification • This methodology which used for collect GCP from LiDAR data able to meet requirement lanjut

  24. DISCUSSION (2) • Comparing between old aerial photo (90’s) and digital image from LiDAR (2010), there are many changes in detail lanjut

  25. DISCUSSION (3)

  26. DISCUSSION (4) • It is difficult to identify detail since work area is densely forested beranda

  27. CONCLUSION (1) • LiDAR data has a very high intensity and density • LiDAR technology make pricking process easier lanjut

  28. CONCLUSION (2) • Inaccurate measurement in AT caused by many changes in detail between old aerial photo and digital image, Hard to identify the point on old aerial photograph. lanjut

  29. CONCLUSION (3) • Digital image from medium camera integrated with LiDAR make it very helpful in points identification and point transfer lanjut

  30. CONCLUSION (4) • Quality of GCP that are generated from LiDAR data is relatively good • GCP RMS fulfill the specification from Bakosurtanal (now BIG) lanjut beranda

  31. THANK YOU beranda

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