Centre of Geographic Sciences Remote Sensing

Field Camp 2015Aerial Photography Collect of CoGS grounds

andFaro Scanning of Annapolis Royal’s Sinclair Inn

Presentation By: Joli Densmore, Alex Graser, Kristy Nicoll, Ryan Poirier and Sean WheelerPrepared For: The Centre of Geographic Sciences and The Nova Scotia Heritage Society

ScopeStudents from the 2015 Centre of Geographic Sciences Remote Sensing

Field camp will collect and process to an orthomosaic visible colour aerial photographs of the grounds of the Centre of Geographic Sciences, Nova Scotia using GoPro cameras at a minimum spatial resolution of 50cm by the 22nd of May 2015 for the purposes of mapping the grounds to within half of the output rasters cell size in positional accuracy.

Concurrently, students from the 2015 Centre of Geographic Sciences Remote Sensing Field camp will collect terrestrial LiDAR and process to a georeferenced RGB point cloud and 3D model a building or structure to be determined in Annapolis Royal, Nova Scotia using a Faro scanner at a minimum point density of 10cm by the 22nd of May 2015 for the purposes of providing measurable analytics between 2 - 5 centimetres accuracy..

Overview● Aerial Photography Preparation● Flying● Post-Processing● Final Production● Validation● The Sinclair Inn● The Faro Scanner● Scanning● Post-Processing in Scene● Post-Processing in Recap● Post-Processing in other softwares● Final floor plan● Final 3d model● Validation● Total station (not sure where I should put this)

Overview - Aerial Photography Collect Preparation (Sean/Kristy)- Aerial photography collect

- - Study area - How? (Go-Pro)- determining the Area of Interest- determining ground coverage of go-pros- the laps (side/end)- flight height- computing flight lines- Final Product - Garmin GPS integration

Study area

2013 Field Camp Mosaic

Area of Interest

Overview - Flying the Aerial Photography (Ryan/Kristy)● How?

o Control Targetso Android Optiono Garmin ultimatelyo Bernie and his Ultralite o Paul’s Go-Pro Rigo Settingso Following the flightlines o Do we want to talk about taking the oblique photos?

The Camera Setup

GoPro 3+

GoPro 3Taking a constant video of the flights

Taking pictures every half of a second

Taking pictures every 10 seconds

Post-Processing (Alex)Photo Scan

Ortho-Mosaic of the COGS grounds

RTK accuracy validation (Ryan)

Sinclair Inn - a History (Kristy?)This image cannot currently be displayed.

Faro Scanning the Sinclair Inn - Prep (Alex/Sean/Ryan?)Faro Scanner Overview- Costs- Learning how- Pieces parts? (diagram maybe?)- Include test data of boardroom? - Maybe a comparison between the Faro and

last year’s scanner?

Faro Scanner Scanner Mirror

Scanner Mount

Reference areaPower button Touch screen display

LED

Start / Stop button

SD memory card slot

Tripod

Power cable

BatteryScanner

USB card reader

Memory card case

Charging cradle

lense cleaner

Scanner Mount

Sphere Targets

Scan Post-Processing - Faro Scene (Joli)

Scans are imported into FaroSCENE where colour is applied to points and the scans are registered together.

registration of 3D scans can be done three different ways:● Target based- using targets such as spheres and walls

the scans● Cloud to cloud- using point clouds that are similar

and/or close together.● Top based- using inclinometer to determine z-axis

Registration methodAfter much trial and error the best registration

method for the project was determined.

Top based registration was used to roughly place the scans, then using the correspondence view the scans were moved to more accurate positions. Then cloud to cloud registration was run to more precisely tie the scans together.

After scans have been properly registered and colour has been applied you can view the point cloud in 3D.

In the correspondence view individual scans can be manipulated so they fit together better allowing the cloud to cloud registration to work better.

Save and Export Initial post processing has been completed:1. colour has been applied to the points from the pictures

taken at the same time2. scans have been properly registered together 3. any “noise” has been removed from the scan

The scans can now be saved and exported so they are ready for the next step of creating a 3D model and 2D floor plan.

Post-Processing in Recap - Ryan

2D Floorplan Extraction (?)

The Sinclair Inn Floorplan

3D Point Cloud Extraction

3D Model of the Sinclair Inn

RTK validation (Ryan)

Total StationTo “walk” control from outside to inside of the building.

Resection- the process of determining the position of the station by means of sights taken toward known points.

Total Station

Known location

Known location

Backsight