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

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

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From Bakosurtanal into the BIG beranda

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

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

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 beranda

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

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

LiDAR System (1) lanjut

LiDAR System (2) lanjut

LiDAR System (3) lanjut

LiDAR System (4) beranda

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

LiDAR Workflow LiDAR Survey Path Planning LiDAR Data Acquisition LiDAR Data Processing lanjut

LIDAR FLIGHT PLAN

AT Workflow Point Selection Pricking Point Measurement beranda

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

Pricking (2)

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

RESULT (2) Aerial Triangulation (AT) RMS GCP RMS X= m RMS Y = m RMS Z= m RMS requirement RMS XY 5 m RMS Z 2 m lanjut

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

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

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

DISCUSSION (3)

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

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

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

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

CONCLUSION (4) Quality of GCP that are generated from LiDAR data is relatively good GCP RMS fulfill the specification from Bakosurtanal (now BIG) berandalanjut

THANK YOU beranda