SHALLOW SOUNDING BATHYMETRIC USING MULTIBEAM ECHOSOUNDER AND TOPOGRAPHIC LASER SCANNER
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1 SHALLOW SOUNDING BATHYMETRIC USING MULTIBEAM ECHOSOUNDER AND TOPOGRAPHIC LASER SCANNER BY : NURSUGI, TRI PATMASARI & KHAFID GEOSPASIAL INFORMATION AGENCY AMSTERDAM, NOVEMBER 2014
2 Indonesia coastline approximately km with 80% ocean
3 Introduction Indonesia as an archipelagic country with 80% of its part covered by sea, and with a length of coastline approximately 99, 988 km. we are now at the stage where mapping, which is a well established engineering subject, has become Increasing influential to people s lives and business processes. Indonesia need technology to speed up updating coastline data including shallow bathymetric data according accuracy of IHO standard
4 Past Experience Efforts have been taken on a series of data collection, survey and marine mapping (including coastal mapping) for marine and coastal resources management. Projects realization and methods for coastlining MREP (Marine Resource Evaluation and Planning), , conventional survey for coastlining DMRM (Digital Marine Resource Mapping), , using Laser Bathymetric, Radarsat, and conventional survey for coastlining
5 Objectives to explore knowledge on using multibeam echosounder and capturing 3D coastline topographic data by laser scanner MDL-Dynascan in the coastal region The intended outcome of performing accurate surveys combining multibeam - Dynascan subsea and surface acquisition systems 'simultaneously', is to produce a georeferenced data set of what is below AND above the waterline For establishing High and Low Water Lines of the coast line
6 Scope Location : Ancol (Jakarta, West Java) Marina Ancol Glass Factory Jakarta Power Plant Volume : 2 km X 0.5 km X 3 location Duration : May, 20th-25th, 2013
7 Location 1. Marina Ancol 2. Glass Factory 3. Jakarta Power Plant
8 Methods Preparation - Mobilitation & Installation - Equipment test and Callibration (GPS and Multibeam Echosounder) - Tide data compilation Data Acquisition Data Processing Analyzing
9 Equipment Configuration Positioning System : DGPS Seastar- Fugro Heading system : Trimble SPS 361 Laser Scanning System: Dynascan MDL 500 Motion Sensor :TSS-DMS Bathymetric system :Multibeam R2 Sonic 2022 Ground Control point Measurentment : GPS Trimble R4
10 Modern multi sensor system on a ship can be equipped as follows Terrestrial Laser Scanner for 3D data acquisition above water, DGPS positioning of the laser scanner and echo sounder, Inertial Measurement Unit (IMU) for determination of the vessels orientation Multi Beam Echo Sounder To Map Seabed Structures / Topography Under Water,
11 Schematical overview of the sensors used on board Survey vessel Little Star
12 DGPS-Positioning, Heading and IMU-Attitude Determination The positioning on board is carried out by DGPS Fugro-Seastar. G2 (Horizontal accuracy: < 10cm to 95% probability Vertical accuracy: < 15cm to 95% probability) Heading system by Trimble SPS receiver with dual Zephyr antenna The accuracy of the heading is 0.09 with sparation antenna 2m Inertial Measurentment Unit (IMU) TSS-DMS 05 The accuracy of the heave = 5 cm,roll and pitch with 0.05
13 Terrestrial Laser Scanner MDL-Dynascan 500 Technical Specifications Class 1 (FDA/ IEC) (Class 2 with red dot pointer) Range up to150 m (500') with 500m (1500') Accuracy (cm): ± 5 (2.5 ) Range resolution (cm): 1 (0.4 ) Scanner field of view: 360 Scanner angle resolution: 0.01 Scanner rate: up to 30 Hz Up to 30 lines per second (1800 rpm) Measurement rate: 36,000 points per second The Dynascan is a fully integrated high speed laser scanner, high accuracy GPS positioning system and inertial measurement unit. - to acquire 3D mapping grade data of topography, urban developments, industrial plants, canal banks and much more
14 Application Examples - in coastal and waterway surveys, - coastline surveys, - environmental assessment - monitoring coastal erosion - etc. The Dynascan is an ideal solution to combine above water survey data with bathymetry surveys for a complete above and below waterline data set
15 Multi beam echo sounder R2-Sonic 2022 Frequency Bandwidth Beamwidth Swath Sector System Range Ping Rate Range Resolution Pulse Length Number of Beams 200 to 400kHz Over 20 frequency selections User selectable in real-time 60 khz, all frequency selections 1 x1 at 400kHz 2 x2 at 200kHz 10 to 160 All frequency selections User selectable in real-time 500m 60 Hz 1.25cm, all frequency selections 15μs-500μs 256
16 Data Acquisition Activity Tide : Priok (permanent tide station) Laser & Multibeam : 3 separate location 1. Marina Ancol 2. Glass Factory 3. Jakarta Power Plant Ground Control Point Measuring 4 control point (marker 1,2 3 and 4)
17 Ancol Picture
18 Ground control point
19 Base Station GPS
20 Data Processing Tide Data: computed by Least Square Adjustment Methods to determining Mean Sea Level and Chart Datum QINSy Online: real-time solution, only online filtered but not quality assured raw data in IMU position, motion and scan data, potential latencies in raw data QINSy Postprocessing DGPS: online filtered data from replay functionality, additional quality assured data in DGPS position, motion, heading tide whereas all detected latencies are compensated QINSy Postprocessing IMU: online filtered data from replay functionality, post processed and quality assured INS trajectory Control point : Trimble Business Center software provides you with the capability to efficiently edit, process, and adjust
21 GCP processing
22 ACCURACY ANALYSIS accuracy analyses could be completed by comparing control point that measured from Geodetic GPS methods (marker 1 to 4) to the feature positioned house front and at the quay wall which showed comparable results in each case (19.25cm in XY, in Z=25 cm). The coordinates of the deviating profile were continuously further distance from the ship, thus it can be assumed that systematic effects occur in this profile
23 3D bathymetry combined with orthophotos and results from a mobile laser scanning of a harbour. The data can be used in a harbour information system to derive vertical clearance information
24 Coastlining Result
25 IHO MINIMUM STANDARDS FOR HYDROGRAPHIC SURVEYS
26 Combination of 3D bathymetry combined with orthophotos and results from a mobile laser scanning of a harbour
27 Conclussions Mobile laser scanning on board a hydrographic survey vessel can be offered for numerous harbour applications 3D mapping for harbor applications, 3D corridor mapping of rivers and its biotopes, Topographic survey of coastal shores and river banks, Determining high accuracies coastline and Zero depth to provide the large scale of Marine and Nautical Base maps in special orders according to IHO Standards for Hydrographic survey
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