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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. - PowerPoint PPT Presentation
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Application of LiDAR Technology for GCP Determination in PapuaTopographic Mapping Scale 1:50.000
Wildan Firdaus - 2011
Bakosurtanal >> BIGBackgroundsProblemsSolutionMethodologyResultsDiscussionsConclusions
LiDAR Photos
Our Team
From Bakosurtanal into the BIG
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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)
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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
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• 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
PROBLEMS
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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
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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
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LiDAR System (1)
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LiDAR System (2)
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LiDAR System (3)
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LiDAR System (4)
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LiDAR Workflow AT Workflow
Aerial Photo
- Digital Terrain Model- Ortho Image
GCP Determination
List of GCP Coordinate
List of Coordinate Measurement
METHODOLOGY
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Bundle Adjustment
Exterior Orientation
LiDAR Workflow
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LIDAR FLIGHT PLAN
AT Workflow
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Pricking (1)
• PrickingTransfer point from digital image LiDAR to Aerial
Photo and then performed pricking on Diapositive
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Pricking (2)
RESULT (1)
• LiDAR Data Acquisition and ProcessingDigital Surface Model (DSM)Digital Terrain Model (DTM)Ortho Image 800 GCP Coordinates
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RESULT (2)
• Aerial Triangulation (AT)RMS GCPRMS X = 2.867 mRMS Y = 3.102 mRMS Z = 0.864 mRMS requirementRMS XY ≤ 5 mRMS Z ≤ 2 m
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RESULT (3)
• Aerial Triangulation (AT)
Sigma Naught = 36,98 micronSigma Naught requirement ≤ 30 micron
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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
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DISCUSSION (2)
• Comparing between old aerial photo (90’s) and digital image from LiDAR (2010), there are many changes in detail
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DISCUSSION (3)
DISCUSSION (4)
• It is difficult to identify detail since work area is densely forested
•
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CONCLUSION (1)
• LiDAR data has a very high intensity and density
• LiDAR technology make pricking process easier
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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.
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CONCLUSION (3)
• Digital image from medium camera integrated with LiDAR make it very helpful in points identification and point transfer
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CONCLUSION (4)
• Quality of GCP that are generated from LiDAR data is relatively good
• GCP RMS fulfill the specification from Bakosurtanal (now BIG)
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THANK YOU
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