drones / suas unmanned aircraft systems at the flood control … · 2ft contours with orthophoto...
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Drones / sUASUnmanned Aircraft Systems at the Flood Control District
Drone Mapping
Joe Wagner
Mapping, Surveying, & CAD Manager
Engineering Division
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Greywolf Drone 1986
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Greywolf Drone 1986
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Greywolf Drone 1986
• 17ft wingspan
• 15ft in length
• 38 hp motorcycle engine
• Catapult launched
• Infrared and daylight camera
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Potential UAS use at the District
• Storm event inspection/documentation
• Surveying/mapping for engineering and design
• Volume calculations for construction projects
• Inspections:
– Dams, Levees
– Bridges
– Construction Management monitoring
– Property inspections and appraisals
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Drone types
• Multi Rotor
• Fixed Wing
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Project Planning
• Define project site and estimate ground control
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Ground Control
• Set aerial targets across project site
• Low and high spots
• Horizontal and vertical
X = easting
Y = northing
Z = elevation
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Mission Planning• Drone mission
planning apps such as DroneDeploy, PIX4D, and DJI GO
• Create flight parameters such as speed, altitude, image overlap based on specifications
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Mission Planning• 18 acres
• 11 min 46 secs flight time
• 159 images
• 200ft AGL
• 80% forward overlap
• 80% side overlap
• 1 battery
• 15 mph
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Photogrammetric processStereo pairs are made up of overlapping images – 80% - 159 images
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Photogrammetric processStereo pairs are made up of overlapping images – 80%
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Photogrammetric process
Photogrammetric mapping was doneusing 9” x 9” film in black and whiteAt a scale of 1” = 800’.
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Photogrammetric process
• Each image taken from the drone is georeferenced using it’s onboard GPS.
• The Bentley ContextCapture software imports each image into their proper location.
• The aerotriangulation process aligns each image and calculates tie points between each image. It looks for like pixels between images.
• ContextCapture merges each image to create the 3D mesh and associated data.
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Drone Flight
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Drone Flight
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Data output
• Vertical accuracy is approx. 2-4 cm
• Individual images – stereo pairs
• 3D mesh
• Orthophoto - georeferenced
• RasterDEM tif - georeferenced
• Digital Surface Model (DSM) pointcloud LAS file
• Contours
• Video – 4K mp4 or mov formats
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Output Data From Flight
• 3D mesh
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3D mesh flythrough
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3D mesh of rock slide area
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3D mesh TIN
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3D mesh
3D mesh created from Nikon DSLR images
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Aerial LiDAR pointcloud
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Aerial LiDAR pointcloud
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Drone derived pointcloud
Full LiDAR Bare earth LiDAR
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Drone derived 2ft contours
2ft Contours with orthophoto 2ft Contours
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Orthophoto comparison
County ortho.32’ pixel resolution
Drone ortho.7” pixel resolution
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Orthophoto comparison
County ortho.32’ pixel resolution
Drone ortho.7” pixel resolution
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3D pointcloud from drone
Each pixel represents X,Y, and Z values3D pointcloud with RGB values on each point
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3D pointcloud from Leica C10
3D pointcloud with RGB values from terrestrial ground scanner - notice shadows from vegetation and ground above scanner.
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Siphon Draw Fissures Flight
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Siphon Draw Fissures Flight
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Siphon Draw Fissures Flight
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Siphon Draw Fissures Flight
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Siphon Draw Fissures Flight
Without ground control With ground control
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Siphon Draw Fissures Flight
Drone flight with ground control
County orthophoto
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Siphon Draw Fissures Flight
Weir pointcloud Fissure pointcloud
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Question?
Joseph Wagner
Mapping, Surveying, & CAD Manager
Engineering Division
Flood Control District
2801 W Durango St, Phoenix, AZ 85009
602-506-2203 Office
623-297-2638 Cell