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3Dsurvey.si

UAV’s in Surveying:

“Integration/processes/deliverables A-Z”

Info@eGPS.net

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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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Part 107 Cert. &Airspace Authorization and

Waivers

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SKYWARD/LAANC WORKFLOW

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“Low Altitude Authorization and Notification Capability”

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SOP/Checklist

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NEW SURVEYING TOOL

3Dsurvey

GPS

DRONE

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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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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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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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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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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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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

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ORIENTATION

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POINTCLOUD

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DSM

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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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WHAT TO EXPECT – QUICK REPORTS

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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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TIME EFFICIENCY COMPARISON

Drone Survey is 60% more time effective!

Field Work Office Work Time Saving

TraditionalSurvey Drone Survey

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• 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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This is not a “cloud based” solution

YOU control the QA/QC of the

Deliverables!

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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)

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Start your mapping project today!

info@eGPS.netwww.eGPS.net

Questions?