uav’s in surveying: “integration/processes/deliverables a z”uav’s in surveying: ......
TRANSCRIPT
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3Dsurvey.si
TODAY‘S PROGRAM
Introduction to photogrammetry and 3Dsurvey
Theoretical facts about the technology and basics of 3dsurvey Introduction to drone mappingImagery acquisition guidelinesMapping & 3D modellingGround control points setup
Real case presentation, functionalities, hands-on live work with 3DsurveyIntroduction to 3Dsurvey softwareProcessing, modelling and analysis workflow in 3Dsurvey – small example: From 2D images to 3D model and orthophoto. General report.Quick tools – 3D measurements, profile lines, volume calculation, (single/multiple surfaces), contour lines, classification, drape orthophoto, point picking with codes, …
Q&A and conclusion
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3Dsurvey.si
Part 107 Cert. &Airspace Authorization and
Waivers
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3Dsurvey.si
SKYWARD/LAANC WORKFLOW
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3Dsurvey.si
“Low Altitude Authorization and Notification Capability”
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SOP/Checklist
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3Dsurvey.si
NEW SURVEYING TOOL
3Dsurvey
GPS
DRONE
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3Dsurvey.si
WHAT TO EXPECT FROM YOUR DRONE PROGRAM
Get you to final results: survey map, break-lines, features,
feature lines, profiles, volume calculations
Uses inexpensive drone –check obtainable results Survey grade accuracy
60% - 90% time savings Independent tool for every surveying company Standard procedures
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BENEFITS of DRONE SURVEYING
Fast return on initial investment
Huge time savings(up to 90%) Eliminate field re-visits
Survey grade accuracy Complete data acquisition Seamless solution
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3Dsurvey.si
KEY ELEMENTS OF DRONE SURVEYING
DroneGPSMission Planning
3Dsurvey
Standard operating proceduresSeamless processing workflows
HAR
DWAR
ESO
FTW
ARE
KNO
WLE
DGE
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3Dsurvey.si
HARDWARE - DRONES
Multi Rotor Multi Rotor Heavy lift Fixed-wings
Easy to useSmallReliableSafeInexpensiveNadir/oblique imagery
Any payloadDifferent camera optionsCustom solution
Covers large areaLonger flight time
Single payload option
Can be complicated to useParts can malfunction - servicingExpensive
Can be complicated to useMost have no No vertical take offNo oblique imagesExpensive
Perfect surveying tool More for custom applications Good for large areas (>10 km^2)
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HARDWARE - SENSORS
Integrated cameras Big DSL cameras LIDAR sensor
StableReliableEasy to use/prepareHigh Accuracy
High resolutionHigh Accuracy
Terrain under vegetationModerate accuracy
Low stabilityGimbal needs calibrationGimbal can breakHeavy weight – low flying time
Long flight preparation timeExpensive – is relative to scope of work
Perfect surveying tool No benefit for accuracyMore will go wrong Good for large areas
8-10 GCP per flight No. GCP per flight for survey grade accuracy: 5-8
No. GCP per flight for survey grade accuracy: 4
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SHUTTER TYPE
Rolling shutter
• One row recorded at a time• Moving causes distortion
Mechanical shutter
• All pixels recorded simultaneously
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GLOBAL SHUTTER CAMERAS
Mechanical shutter cameras
DJI Inspire 2 X4S
DJI Phantom 4 pro
Rolling shutter camerasMost CMOS sensor cameras
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FEATURE POINTS
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MATCHES
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FROM 2D TO 3D
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WHAT IS IMPORTANT – RESOLUTION
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WHAT IS IMPORTANT – RESOLUTION
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3Dsurvey.si
WHAT IS IMPORTANT – PERSPECTIVES
Basic grid flight configuration
Overlap 70% -80%
10 GCP per Flight
Horizontal Accuracy:
• 1 pixel - 2 pixel
Vertical Accuracy:
• 1 pixel - 3 pixel
• Expected accuracy range
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GEOREFERENCING
Determination of PositionRotation and Scale of photogrammetric model
Georeferencing with Ground Control Points
Georeferencing with Telemetry information
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3Dsurvey.si
GCP – GROUND CONTROL POINTS
• You gain absolute orientation of your reconstructed model using Ground Control Points or GCPs.
• A good practice is to measure several check points in the field, besides the Ground Control Points. The check points will let you calculate the accuracy of the model using regular surveying calculation methods.
HOW DO YOU KNOW IF YOUR DRONE SURVEY IS ACCURATE OR NOT?The difficulty is that an accurate orthophotomap, DEM or 3D model very often looks identical to an inaccurate one. If you have good parameters like the terrain profile, drone hardware choice, image overlap, weather conditions, stability and speed of the flight, and GPS conditions, the model should be pretty accurate.
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ABSOLUTE vs. RELATIVE ACCURACY
• In photogrammetry, accuracy is always relative to positional accuracy, which is defined as the degree to which the information on the map created from the data captured matches the actual real world.
• Accuracy, if you cannot define it and deliver it, you would end up offering your clients nothing more than a pretty picture from above.
• RELATIVE AND ABSOLUTE ACCURACY
• This is where things start to become interesting, as well as more complicated. It is one thing to generate an accurate photogrammetric model, but fitting it accurately to a geodetic coordinate system is a different ball game altogether.
• Relative accuracy is the measurement of how objects are positioned relative to each other in a reconstructed model (Orthophotomap, Digital Surface Model or 3D point cloud).
• Absolute accuracy refers to the difference between the location of the objects on the reconstructed model and their true position on the Earth (or a geodetic coordinate system).
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GCP Markers
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3Dsurvey GCP Marker
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GCP SETUP - AREA
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GCP SETUP – LINEAR OBJECT (ROAD)
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WHAT IS IMPORTANT –MISSION PLANNING-GRID
Image Acquisition:MISSION: GRID
70% - 80% frontal
overlap
70% - 80% side
overlap
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WHAT IS IMPORTANT – MISSION PLANNING - LINE
Image Acquisition:MISSION: Road, Railway, River,…
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FLIGHT - TO - DESKTOP
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3Dsurvey.si
HOW IT WORKS
• Capture images and geospatial data by drone or plane / 3Dsurvey automatically processes and matches images
• Generate 3D mesh & calculate digital terrain model
• Build high-density, geo-referenced and spatially orientated 3D point cloud
• Create textured models with realistic colours, calculate orthophotos / Customizable results and 3D visualization
• Use 3Dsurvey’s tools to manipulate 2D or 3D data, create survey maps and industry-tailored outputs / Recalculate, apply corrections or change layouts anytime
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IMAGE IMPORT
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BUNDLE ADJUSTMENT
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BUNDLE ADJUSTMENT
3Dsurvey.si
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ORIENTATION
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POINTCLOUD
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DSM
3Dsurvey.si
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LOW ALTITUDE PHOTOGRAMMETRY APPLICATIONS
Survey Construction Mining Inspection
Environmental monitoring Forensics Emergency
response
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SurveySURVEY
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CONSTRUCTION
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OPEN-PIT MINING
QUARRY
STOCKPILE MANAGEMENT
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INSPECTION
Analyze in the office
Defect mapping
Cost - effective access to inaccessible areas
HD visual control
Orthophoto
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ENVIRONMENTAL MONITORING
Changing environment
Track Changes
Measurable results
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HYDRO/BATHYMETRICS
Erosion Studies
Mining/Quarry Tailings
O&G ponds
River Surveys
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HYDRO
USV
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LiDAR vs. Photogrammetry
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LiDAR
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EMERGENCY RESPONSE
Actionable results
Damage control
Fast response
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FORENSICS
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WHAT TO EXPECT - ORTHOIMAGE
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Stand alone web application coming soon for presentation of
“side-by-side” slide comparison i.e. weekly progress reports.
PROGRESS REPORTS
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WHAT TO EXPECT – CONTOUR LINES
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WHAT TO EXPECT – CAD
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LINE EXTRACTION FEATURE
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WHAT TO EXPECT – PROFILES
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WHAT TO EXPECT – VOLUMES
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3Dsurvey.si
WHAT TO EXPECT – QUICK REPORTS
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3Dsurvey.si
DRONE SURVEY EFFICENCY
20%
80%
50% 50%
95%
5%
Topo (planning and design) Cadastre Volume calculations
Drone Survey Traditional survey Drone Survey Traditional survey Drone Survey Traditional survey
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3Dsurvey.si
TIME EFFICIENCY COMPARISON
Drone Survey is 60% more time effective!
Field Work Office Work Time Saving
TraditionalSurvey Drone Survey
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3Dsurvey.si
• 3Dsurvey is a versatile solution, able to analyze and/or process any kind of spatial data, whether it is lidar or a photogrammetric point cloud or combination of both.
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3Dsurvey.si
This is not a “cloud based” solution
YOU control the QA/QC of the
Deliverables!
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3Dsurvey.si
What updates are ahead:
• GPU/CPU dual processing – (Sept 1st ’18)
• Enhanced CAD functions; 3D linework
(Oct. ‘18)
• Color/Coding within Classification process
Features i.e. towers, lines (Oct. ‘18)
• Pilot App (in Beta, ETA: 4th quarter)