Potential of UAVs for Beach Profiles of Low Lying Islands Pacific Islands GIS&RS User Conference...
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Transcript of Potential of UAVs for Beach Profiles of Low Lying Islands Pacific Islands GIS&RS User Conference...
Potential of UAVs for Beach Profiles of Low
Lying Islands
Pacific Islands GIS&RS User Conference 2012, Suva
Wolf Forstreuter
Image to Image Correction of Historical Photos
Image to Image Correction of Historical Photos
19681968 20002000
Secondary Base Station at the Beach
Line of sight to rover unit
5 hours recording parallel to base station at high school
Line of sight to rover unit
5 hours recording parallel to base station at high school
Position Recording
Locating the position Adjusting the pole
Locating the next positionRecording
Extre
mely
time co
nsum
ing,
every
point ~ 5 m
inutes
UAVs Alternative ?
• Can be transported easily to and reassembled on the Pacific Island
• Only needs one SOPAC operator• Operator based at SOPAC could
service one island after the other
The Requirements
• 20 – 30 cm contour lines– About 5 – 7 cm vertical accuracy
• Volume calculation and volume change detection after 5 years– Absolute orientation to WGS84
• DTM calculation on the island
Talks with Different UAV Companies (fixed wing)
• Trimble Navigation• AVI System• MAVINICI• FOTOMAPY• GeoScan• AGISOFT• Drone METREX
The Virtual 3D Environment
• Calibrated cameras
• Relative -• Inner -• Absolute
orientation• Manual
analysisSoftware
has deve
loped
New Software
• Calibrates the camera from the points detected in images
• Handles the relative and inner orientation
• Needs ground reference points called image reference points
• Creates absolute oriented DTM
Image Reference Points
• Flat disks• Black cross• ~ 16 distributed over the block
covering all height levels• Survey grade GPS survey!
Overlap of Images
• 80 % in flight direction
• 60 % between flight strips
• 4 parallel flight strips necessary
Every RIP must be visible on 15 images
UAV Height over Ground
• Time between exposures and pixel size determines flight height
• 80 % overlap is a must
100 – 120 m
Est. Time Requirements
• Installation of main base station• Installation of secondary base
station• Establishment of RIP 1.5 h/block• Preparation of UAV incl. flight
planning 0.5• Flying UAV 0.5• DTM establishmentThree block
s / day
Three blocks /
day
Position UAV Handling
Requirements:• Handling & maintenance of UAV• Handling and updating flight
planning software• Handling survey grade GPS• Handling DTM software (photo-
grammetric knowledge)
Political Requirements:
A. Countries have to allow operating UAVs on outer islands
B. Countries have to address demand