photogrammetry for architecture and construction

Session 3.1: Photogrammetry for Site and Exterior/Interior Architecture

Dat Lien and Xavier LoayzaAxoscape

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AgendaTopicsPhotogrammetry 101Data captureData processingInformation Sharing and Sample outputs

Photogrammetry 101DefinitionMeasure of physical objects (geometry) from images.

Computer visionStereoscopy ->“Depth illusion”

object point coordinate

Photogrammetry 101DefinitionMeasure of physical objects (geometry) from images.

Computer visionStereoscopy ->“Depth illusion”

common pointcommon point

object point coordinate

Image 01:x,y,z camera coordinatespitch,yaw,roll camera orientationcamera characteristics

Image 01:x,y,z camera coordinatespitch,yaw,roll camera orientationcamera characteristics

ApplicationsSurveying, City PlanningClash DetectionGamificationAR/VRFacade reconstructionSun analysisProject monitoringProject PlanningProject Safety

PhotogrammetryModern Workflow (Walkthrough)

Data capture Data processing Output

Data Capture

VehiclePayloadsMission Plan

OverlapOther Sensors

Data CaptureVehicles Payloads

VS.

WING MULTI-ROTOR

WING MULTI-ROTOR

Data Capture - PayloadsFrom

NON-VISIBLE SPECTRUM STEREO

LASER

VISIBLE SPECTRUM

Videos Images

EXISTING 3D DATA

NEAR INFRARED (NIR)

Data Capture - UAVsLegal Aspect: 333 ExemptionBy law, any aircraft operation in the national airspace requires

1.Certificated and registered aircraft 2.A licensed pilot3.Operational approval 4.Small Unmanned Aircraft Regulations (Part 107)

Updated as of June 21, 2016!

Data Capture - UAVsLegal Aspect: 333 ExemptionSection 333 of the FAA Modernization and Reform Act of 2012 grants the Secretary of Transportation the authority to determine whether an airworthiness certificate is required for a UAS to operate safely in the NAtional Airspace System (NAS)

Data Capture - UAVsLegal Aspect: 333 Exemptionhttps://www.faa.gov/uas/legislative_programs/section_333/

Come visit our booth for a usb thumb drive with a section333 exemption template.

Small Unmanned Aircraft Regulations (Part 107)

Small Unmanned Aircraft Regulations (Part 107)Summary of Part 107:

400’

Data Capture - UAVsUAV Table

UAV Name Photo Price Flight Time Features

Solo (3DR) $999-$1500 20 minAuto-pilot for

planning missions

Iris+ (3DR) $599-$1200 15 minAuto-pilot for

planning missions

Data CaptureMission Plan

Can you Identify the potential issues?

Data CaptureMission Plan

Data CaptureAlways plan...

Photogrammetry 101Always plan...

Photogrammetry 101Mission Plan

Data CaptureOverlapExterior environments Interior environments

Data CaptureOverlapFor Exteriors

• 75% Frontal overlap (FO)

• 60% Side overlap (SO)

For Interiors• 90% overlap

75%

60%

FRONT OVERLAP

SIDE OVERLAP

Data CaptureOverlapUrban mapping (Orthomosaic)

• Single Grid• Not suitable for 3d outputs• NADIR camera angle

Data CaptureOverlapUrban 3d reconstruction

• Double Grid• 10° - 35° camera angle

camera angle

Building 3d reconstruction• Multiple heights• 30° - 45° camera angle• Every 5° - 10° (around)

camera angle

Data CaptureFrom Existing 3D DataBIM Contest 2016

Screen capture (Fly SIM)

Collected from 3d Data

Data Capture - Existing DataFrom Existing 3D DataBIM Contest

WORKFLOW FOR BUILDINGS(.fbx)

PHOTOGRAM. WORKFLOW (.fbx-.obj)

Data Capture - PayloadExisting ConditionsCamera trigger

By time frequencyBy distanceBy coordinates

Weather conditionsLightWind

Easy/Difficult surfaces

Data Capture - PayloadExisting ConditionsCamera trigger

By time frequencyBy distanceBy coordinates

Weather conditionsLightWind

Easy/Difficult surfaces

Data Capture - PayloadExisting ConditionsCamera trigger

By time frequencyBy distanceBy coordinates

Weather conditionsLightWind

Easy/Difficult surfaces

Data Capture - PayloadExisting ConditionsCamera trigger

By time frequencyBy distanceBy coordinates

Weather conditionsLightWind

Easy/Difficult surfaces

Data Capture - PayloadExisting ConditionsCamera trigger

By time frequencyBy distanceBy coordinates

Weather conditionsLightWind

Easy/Difficult surfaces

Data Capture - PayloadExisting ConditionsCamera trigger

By time frequencyBy distanceBy coordinates

Weather conditionsLightWind

Easy/Difficult surfaces

Data Capture - PayloadExisting ConditionsCamera trigger

By time frequencyBy distanceBy coordinates

Weather conditionsLightWind

Easy/Difficult surfaces

Data Capture - PayloadExisting ConditionsCamera trigger

By time frequencyBy distanceBy coordinates

Weather conditionsLightWind

Easy/Difficult surfaces

Data Capture - PayloadExisting ConditionsCamera trigger

By time frequencyBy distanceBy coordinates

Weather conditionsLightWind

Easy/Difficult surfaces

Photogrammetry 101Modern Workflow

Data capture Data processing Output

Data ProcessingData ProcessingValid imagesCommon pointsCamara estimations

Data ProcessingSoftwareRecap 360Pix4dPhotoscanOpen Drone MapContext Capture

Data ProcessingRecap 360

• Cloud processing and Off-line• Few steps -> Less user control• Autodesk compatibility

Recap 360 -> Upload photos

Photo to 3D

Recap 360 -> Locate survey points

Photo to 3D

Recap 360 -> Setting up Output

Recap 360 -> Setting up Output

Autodesk Remake

Data ProcessingPix4D

• Off-line processing• More user control• Generic compatibility

Pix4D -> New Project

Pix4D -> Select Images

Pix4D -> Image Properties

Pix4D

Data ProcessingComparison Matrix

Price Dataset size OS

Pix4D Medium 2000 images* Win, Mac (Beta), Linux

Recap 360 PRO Low 250 images Cloud

Agisoft Low 10000 images* Win, Mac, Linux

ContextCapture High no limit Win, Mac

OpenDroneMap Open source - Ubuntu

Data ProcessingPricing

Data ProcessingPricing

Data ProcessingResulting Mesh Comparison

Recap vs Pix4d

PhotogrammetryModern Workflow

Data capture Data processing Output

Output

OrthomosaicPoint cloud3d mesh

Orthomosaic Point cloud 3d mesh

What are my options from now?

Mesh to Revit - Meshlab

Mesh to Revit - Meshlab

Mesh to Revit - Meshlab

Mesh to Revit - Meshlab

Mesh to Revit - OBJ/FBX to DXFInsert DXF link (Check units)Toposurface - Create from importCreate material using orthomosaic

Mesh to Revit - OBJ/FBX to DXF

PointCloud-DEM-Civil3d-Revit

OutputClash detection/Modeling

Output

OrthoplaneFacade

Information SharingPotreeWeb basedOpen source

Information SharingSketchfab

Information SharingSketchfab

Information SharingRECAP

Information Sharing - A360RECAP

Axoscape

Thank You!

Questions?

3.1. Photogrammetry for Site and Exterior/Interior Architecture

xavier.loayza@axoscape.comSocial Media Contact Details (if desired)