UAV s in Surveying: Integration/processes/deliverables A-Z. 3Dsurvey.si
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1 UAV s in Surveying: Integration/processes/deliverables A-Z Info@eGPS.net
2 TODAY S PROGRAM Introduction to photogrammetry and 3Dsurvey Theoretical facts about the technology and basics of 3dsurvey Introduction to drone mapping Imagery acquisition guidelines Mapping & 3D modelling Ground control points setup Real case presentation, functionalities, hands-on live work with 3Dsurvey Introduction to 3Dsurvey software Processing, 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
3 Part 107 Cert. & Airspace Authorization and Waivers
4 SKYWARD/LAANC WORKFLOW
5 Low Altitude Authorization and Notification Capability
6 SOP/Checklist
7 NEW SURVEYING TOOL GPS 3Dsurvey DRONE
8 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
9 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
10 KNOWLEDGE SOFTWARE HARDWARE KEY ELEMENTS OF DRONE SURVEYING Drone GPS Mission Planning 3Dsurvey Standard operating procedures Seamless processing workflows
11 HARDWARE - DRONES Multi Rotor Multi Rotor Heavy lift Fixed-wings Easy to use Small Reliable Safe Inexpensive Nadir/oblique imagery Single payload option Any payload Different camera options Custom solution Can be complicated to use Parts can malfunction - servicing Expensive Covers large area Longer flight time Can be complicated to use Most have no No vertical take off No oblique images Expensive Perfect surveying tool More for custom applications Good for large areas (>10 km^2)
12 HARDWARE - SENSORS Integrated cameras Big DSL cameras LIDAR sensor Stable Reliable Easy to use/prepare High Accuracy 8-10 GCP per flight High resolution High Accuracy Low stability Gimbal needs calibration Gimbal can break Heavy weight low flying time No. GCP per flight for survey grade accuracy: 5-8 Terrain under vegetation Moderate accuracy Long flight preparation time Expensive is relative to scope of work No. GCP per flight for survey grade accuracy: 4 Perfect surveying tool No benefit for accuracy More will go wrong Good for large areas
13 SHUTTER TYPE Mechanical shutter All pixels recorded simultaneously Rolling shutter One row recorded at a time Moving causes distortion
14
15 GLOBAL SHUTTER CAMERAS Mechanical shutter cameras Rolling shutter cameras Most CMOS sensor cameras DJI Phantom 4 pro DJI Inspire 2 X4S
16 FEATURE POINTS
17 MATCHES
18 FROM 2D TO 3D
19 WHAT IS IMPORTANT RESOLUTION
20 WHAT IS IMPORTANT RESOLUTION
21 WHAT IS IMPORTANT PERSPECTIVES Basic grid flight configuration Expected accuracy range Overlap 70% -80% 10 GCP per Flight Horizontal Accuracy: 1 pixel - 2 pixel Vertical Accuracy: 1 pixel - 3 pixel
22 GEOREFERENCING Determination of Position Rotation and Scale of photogrammetric model Georeferencing with Telemetry information Georeferencing with Ground Control Points
23 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.
24 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).
25 GCP Markers
26 3Dsurvey GCP Marker
27 GCP SETUP - AREA
28 GCP SETUP LINEAR OBJECT (ROAD)
29 WHAT IS IMPORTANT MISSION PLANNING-GRID Image Acquisition: MISSION: GRID 70% - 80% frontal overlap 70% - 80% side overlap
30 WHAT IS IMPORTANT MISSION PLANNING - LINE Image Acquisition: MISSION: Road, Railway, River,
31
32 FLIGHT - TO - DESKTOP
33 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 Create textured models with realistic colours, calculate orthophotos / Customizable results and 3D visualization Build high-density, geo-referenced and spatially orientated 3D point cloud Use 3Dsurvey s tools to manipulate 2D or 3D data, create survey maps and industry-tailored outputs / Recalculate, apply corrections or change layouts anytime
34 IMAGE IMPORT
35 BUNDLE ADJUSTMENT
36 BUNDLE ADJUSTMENT
37 ORIENTATION
38 POINTCLOUD
39 DSM
40 LOW ALTITUDE PHOTOGRAMMETRY APPLICATIONS Survey Construction Mining Inspection Environmental monitoring Forensics Emergency response
41 Survey SURVEY
42 CONSTRUCTION
43 OPEN-PIT MINING QUARRY STOCKPILE MANAGEMENT
44 INSPECTION Defect mapping Cost - effective access to inaccessible areas HD visual control Orthophoto Analyze in the office
45 ENVIRONMENTAL MONITORING Changing environment Track Changes Measurable results
46 HYDRO/BATHYMETRICS Erosion Studies Mining/Quarry Tailings O&G ponds River Surveys
47 HYDRO USV
48 LiDAR vs. Photogrammetry
49 LiDAR
50 EMERGENCY RESPONSE Actionable results Damage control Fast response
51 FORENSICS
52 WHAT TO EXPECT - ORTHOIMAGE
53 PROGRESS REPORTS Stand alone web application coming soon for presentation of side-by-side slide comparison i.e. weekly progress reports.
54 WHAT TO EXPECT CONTOUR LINES
55 WHAT TO EXPECT CAD
56 LINE EXTRACTION FEATURE
57 WHAT TO EXPECT PROFILES
58 WHAT TO EXPECT VOLUMES
59 WHAT TO EXPECT QUICK REPORTS
60 DRONE SURVEY EFFICENCY Topo (planning and design) Cadastre Volume calculations 20% 80% 50% 50% 5% 95% Drone Survey Traditional survey Drone Survey Traditional survey Drone Survey Traditional survey
61 TIME EFFICIENCY COMPARISON Field Work Office Work Time Saving TraditionalSurvey Drone Survey Drone Survey is 60% more time effective!
62 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.
63 This is not a cloud based solution YOU control the QA/QC of the Deliverables!
64 What updates are ahead: GPU/CPU dual processing (Sept 1 st 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: 4 th quarter)
65 Questions? Start your mapping project today!
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