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3D mapping of a quarry

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High resolution UAV survey of a quarry using 3D flight planner

Published in: Engineering

3D mapping of a quarry

  1. 1. High resolution 3D UAV mappingHigh resolution 3D UAV mapping of a quarryof a quarry Hytola Engineering Oy matti.hytola@gmail.com Suolahdentie 692 +358407776513 FIN-44330 HYTÖLÄ hytola.com Hytola Engineering Oy did 3D UAV mapping of Nordkalk Lappeenranta, Finland quarry in November 2017. Task was to take images of almost vertical walls with 1 cm GSD (Ground Sampling Distance → resolution). This means 10 000 pixels / m². A 3D meshes and point clouds were processed from images with average point density of 1250 3D-points / m². A multicopter type of a UAV (drone) was used for taking the images in four days. Short light time of a day and rainy weather were limiting operation hours in a day. With optimal weather condititions imaging would have taken less than two days. As area of the quarry was about 50 ha, 125 acres, it was clear that amount of data would be huge. Over 10000 20 Mpix pictures were taken and 3D point cloud had over 1 000 000 000 points! This report will descripe used method and results achieved.
  2. 2. Kuvaspisteiden sijainnit Hytola Engineering Oy matti.hytola@gmail.com Suolahdentie 692 +358407776513 FIN-44330 HYTÖLÄ hytola.com Image capture positions The greatest challenge was to plan flight route so that distance from UAV to pit wall would stay optimal for desired resolution with minimized risk of collision. A 3D flight planning software by Hytola Engineering Oy was used to plan optimal flight route for UAV. With this software it was possible to optimize UAV's camera angle and tilt to match the slope to be mapped. Whole quarry was divided to sectors. Size of each sector was defined by operation time and and range of UAV with capacity of one battery. With speed of 5 m/s and GSD of 1 cm UAV will fly a 6 km long route which converts to 12 ha area and 600 images. High resolution 3D UAV mappingHigh resolution 3D UAV mapping of a quarryof a quarry
  3. 3. Hytola Engineering Oy matti.hytola@gmail.com Suolahdentie 692 +358407776513 FIN-44330 HYTÖLÄ hytola.com 3D model of the quarry was wanted to be in ETRS GK28 coordinate system. Because of this and to match images taken in different time of day, 11 signal plates, used as 3D ground control points, were placed in quarry area. 4 plates were placed at top, 4 at medium height and 3 at bottom. Quarry measurement team did measure coordinates of the center point for each signal plate. High resolution 3D UAV mappingHigh resolution 3D UAV mapping of a quarryof a quarry
  4. 4. Hytola Engineering Oy matti.hytola@gmail.com Suolahdentie 692 +358407776513 FIN-44330 HYTÖLÄ hytola.com Image capture positions in 3D- ja 2D- pictures. UAV did fly automatically all routes needing high accuracy. Over 10 000 images were taken. High resolution 3D UAV mappingHigh resolution 3D UAV mapping of a quarryof a quarry
  5. 5. Hytola Engineering Oy matti.hytola@gmail.com Suolahdentie 692 +358407776513 FIN-44330 HYTÖLÄ hytola.com A photogrammetry program was used for processing images. Dimensionally accurate ortoimage and ortomosaic were generated. And high resolution 3D models and 3D point clouds for each sector. High resolution 3D UAV mappingHigh resolution 3D UAV mapping of a quarryof a quarry
  6. 6. Hytola Engineering Oy matti.hytola@gmail.com Suolahdentie 692 +358407776513 FIN-44330 HYTÖLÄ hytola.com 3D-model makes it possible to do many kind of analysis to target area. Here are three different ways to display data. Single color shaded Color gradient by altitude Realistic surface texture High resolution 3D UAV mappingHigh resolution 3D UAV mapping of a quarryof a quarry
  7. 7. Hytola Engineering Oy matti.hytola@gmail.com Suolahdentie 692 +358407776513 FIN-44330 HYTÖLÄ hytola.com A screen shot from 3D model Part of image zoomed 3D point cloud. High density of point cloud visible in here. High resolution 3D UAV mappingHigh resolution 3D UAV mapping of a quarryof a quarry
  8. 8. Hytola Engineering Oy matti.hytola@gmail.com Suolahdentie 692 +358407776513 FIN-44330 HYTÖLÄ hytola.com Our company is specialised in UAV- mapping and will produce material for your needs: Area and volume measurements, ortophotos, ortomosaics, surface models, elevation models, 3D point clouds an 3D models. Cost effective and with quality quarantee! High resolution 3D UAV mappingHigh resolution 3D UAV mapping of a quarryof a quarry

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