20160923145332001.0FALSEDempster_KM27_D1_2015_07_29.tiffile://R:\UAS\PeelPlateau\Dempster_KM27\Ortho\Dempster_KM27_D1_2015_07_29.tifLocal Area Network002467267.931711467461.6567117451238.1819077451450.7169071ProjectedGCS_North_American_1983Linear Unit: Meter (1.000000)NAD_1983_UTM_zone_8N<ProjectedCoordinateSystem xsi:type='typens:ProjectedCoordinateSystem' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xmlns:xs='http://www.w3.org/2001/XMLSchema' xmlns:typens='http://www.esri.com/schemas/ArcGIS/10.3'><WKT>PROJCS["NAD_1983_UTM_zone_8N",GEOGCS["GCS_North_American_1983",DATUM["D_North_American_1983",SPHEROID["GRS_1980",6378137.0,298.257222101]],PRIMEM["Greenwich",0.0],UNIT["Degree",0.0174532925199433]],PROJECTION["Transverse_Mercator"],PARAMETER["false_easting",500000.0],PARAMETER["false_northing",0.0],PARAMETER["central_meridian",-135.0],PARAMETER["scale_factor",0.9996],PARAMETER["latitude_of_origin",0.0],UNIT["Meter",1.0],AUTHORITY["EPSG",26908]]</WKT><XOrigin>-5120900</XOrigin><YOrigin>-9998100</YOrigin><XYScale>450445547.3910538</XYScale><ZOrigin>-100000</ZOrigin><ZScale>10000</ZScale><MOrigin>-100000</MOrigin><MScale>10000</MScale><XYTolerance>0.001</XYTolerance><ZTolerance>0.001</ZTolerance><MTolerance>0.001</MTolerance><HighPrecision>true</HighPrecision><WKID>26908</WKID><LatestWKID>26908</LatestWKID></ProjectedCoordinateSystem>8FALSELZW4TIFFTRUEcontinuousunsigned integer20160923161543002016092316164200500005000ItemDescriptionMicrosoft Windows 7 Version 6.1 (Build 7601) Service Pack 1; Esri ArcGIS 10.3.1.4959Dempster_KM27_D1_2015_07_29.tif1-135.756250-135.75171567.17827567.176348UAS photos surveys were conducted July 28 and July 29, 2015 using a Spyder PX8 Plus 1000 octocopter by XPedition Robotics. A 24 megapixel Sony a6000 mirrorless camera with Sony f/2.8 20mm lens was mounted to the octocopter. Mission Planner v1.3 software was used to create autonomous 12-13 minute missions in a grid pattern with up to 90% forward overlap and 83% side photo overlap at 90 m height above ground. This imaged each ground location with up to 60 photos at a 15 mm spatial resolution. The camera was tilted approximately 10 degrees forward to minimize the potential for doming artifacts in the Sructure-From-Motion height model that can result from incorrect radial camera calibration in a nadir-only camera orientation. Photos in JPEG format were captured at a 1/1000 second shutter interval and geotagged using the log file from the onboard 3DR UBlox GPS that provided a 5 Hz update rate.
Photos were processed using Agisoft PhotoScan v1.2.0 (build 2198) SfM software that applies proprietary algorithms to generate dense 3D point clouds and orthomosaics. Point clouds generated from PhotoScan were edited and processed into digital surface models. Steps were as follows: 1) Blurry photos were removed. 2) Scale-invariant features (keypoints) were identified and matched in overlapping photos. 3) The three-dimensional location of each keypopint and calibration parameters for each camera position were solved through a bundle block adjustment. This created a spare cloud of 3D points whereby camera calibration and georeferencing were optimized at this step (building on the 1-3 m accuracy, direct georeferencing from the UAV GPS locations) by including five GCP ground targets (red Frisbees with a painted yellow cross) measured to within 2 cm using post-differential correction to a nearby base station.(4) Generated an dense point cloud of coloured 3D points using multi-view stereo image matching. (5) Generate an orthomosaic by orthorectifying each photo to conform to a digital surface model and then mosaicking them. (6) Export the orthomosaic as a 1.5 cm resolution geoTIFF file and the dense point cloud as tiled .las files, both in UTM zone 8 projection.<DIV STYLE="text-align:Left;"><DIV><DIV><P><SPAN>Unmanned Aircraft System surveys were conducted to capture road embankment subsidence (slumping). Data captured in support of a Natural Resources Canada project funded by Polar Knowledge Canada and the TRACS project led by Steve Wolfe at the Geological Survey of Canada.</SPAN></P></DIV></DIV></DIV>ImageryorthohighwayinfrastructureDempstersubsidencepermafrostslumpNatural Resources Canada - Canada Centre for Mapping and Earth Observation - Canada Centre for Remote Sensing.
Leads: Robert Fraser (robert.fraser@canada.ca) and Ian Olthof (ian.olthof@canada.ca).
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