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SOCIÉTÉ CANADIENNE DE TÉLÉDÉTECTION (CRSS-SCT) – SECTION ATLANTIQUE
Les membres du CRSS-SCT sont cordialement invités à assister au webinaire du 26 janvier à 14h00 heure de l’Atlantique et 14h30 heure de Terre-Neuve-et-Labrador, présenté par Melanie Irvine (Commission géologique de Terre-Neuve-et-Labrador, ministère des Ressources naturelles, St. John’s, T-N, Canada) intitulé:
From Eroding Cliffs to Mine Tailings: Using UAVs in Geoscience
Unmanned Aerial Vehicles (UAVs) provide an effective tool to study the physical environment, as they cover a large area in a time-efficient manner while collecting a significant quantity of accurate data. The UAV operates by flying at a low altitude, typically 40 to 60 m, and collects overlapping aerial images. Using photogrammetry software, the two-dimensional images are processed to produce three-dimensional objects using an algorithm that finds matching points on adjacent photos. To increase data accuracy, topographic survey equipment is used to georeference the data. Outputs include orthophotos, digital surface models, three-dimensional models, point clouds, aerial photographs and videos.
In dynamic environments, repeated UAV surveys over multiple-year timespans are providing insight into rates and causes of change, generating data that are used to inform management decisions and land use planning. Annual rates of coastal erosion are being quantified, and factors influencing erosion along coastal cliffs determined. Volumetric changes in coastal dunes are calculated, providing an assessment of the long-term rate of coastal migration. Potential landscape hazards are being studied, leading to better risk assessment. UAVs are being repeatedly flown over mine tailings and berms to detect movement, and over low-lying coastal areas to map flood risk. UAV imagery is used in bedrock mapping; providing valuable insights into structural and stratigraphic features on outcrops. UAV surveys of fossil-bearing surfaces on coastal outcrops and sea stacks provide visuals for geotourism applications, and surveys of glacial landforms provide data for surficial mapping and aid in ice-flow delineation for mineral exploration and the reconstruction of glacial environments.
If you would like to attend, please send an email to me (Raymond.Jahncke@SMU.ca) so that I can send you a WebEx invitation
Raymond Jahncke, Research Associate
Saint Mary’s University
Halifax, Nova Scotia
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