You can then convert the orthomosaic into a 3D mesh (right-hand graphic) to better visualise the stockpile. Taking the stockpile highlighted above, the first step is to draw around its boundary (left image). The map - built by converting imagery captured during a single 15 minute drone flight - provides a real-time view of the entire site, which is useful for a range of insights over and above stockpile calculations.ģ - Analyse: The crux of the issue - conducting the stockpile measurements. The stockpile which will be measured in step three (below) is highlighted by the orange circle. ![]() In this case, SUEZ used the drone data and Esri Site Scan to create an orthomosaic of the whole site, including stockpiles. The DJI GS RTK app - as well as drone mapping software such as DJI Terra or Esri Site Scan - can be used to pre-plan flights on the P4 RTK to automate data collection.Ģ - Process The Data: Input the data into a drone mapping software platform, such as DJI Terra or Esri Site Scan, to create high-resolution 2D maps and 3D models. SUEZ used DJI's low-altitude mapping solution, the Phantom 4 RTK, to collect their stockpile data. Using heliguy™ client SUEZ as a case in point, here's an overview of the drones for stockpile management workflow.ġ - Fly: Automate your drone flight and capture imagery to turn into maps and 3D models. But in truth, drones and drone mapping software simplify matters - providing rich data in the process. If you're new to using drones for stockpile management, the process might seem complicated or daunting. Drones For Stockpile Measurements: Workflow This blog will explore the benefits of using drones for stockpile management and the best workflows for this operation. But using the drone, we can fly over the compound in 15 minutes and process the model in about two hours." The data from these aerial surveys is processed to build visual 2D maps and 3D models for insights, analysis and calculations.Īs Craig Matthews, of Balfour Beatty says: "It would take a surveyor, using traditional handheld equipment, about a day to measure the stockpiles and process the data. Thankfully, a new solution has emerged to eliminate these issues: Volumetric Drone Surveys.ĭrones automate this process, making it safer, easier and quicker to obtain highly-accurate data. Whether you work in construction, mining or aggregates, stockpile management is a crucial operation on any jobsite.īut traditionally, this process has involved manual data collection, resulting in time-consuming, costly, and potentially dangerous ground-based surveys. Drone software uses the drone data to build visual maps and models for analysis, calculations and team-wide collaboration.Terra Drone Europe Case Study: DJI Phantom 4 RTK drone requires fewer GCPs, while still achieving 3cm accuracies during stockpile data collection.Balfour Beatty Case Study: Handheld methods = one day to manually collect the stockpile data and process it Drones = 2 hours and 15 minutes to autonomously collect the stockpile data and process it.Drones have become a key tool for stockpile measurements and volumetric analysis.For example, flatter stockpiles will benefit more from a high GSD than taller stockpiles. Vertically, they lower the uncertainty in Z values, which is proportional to the resolution. Horizontally, high-resolution photogrammetric results create more precise stockpile models, and thus better volume measurement accuracy than ones interpolated from certain measured points. ![]() ![]() ![]() A photogrammetric survey with a fine ground sampling distance (GSD, which indicates the actual distance each pixel represents) is able to better describe irregular stockpiles in detail. When it comes to stockpile volume measurements, stockpiles do not conform to a perfect shape. Why use photogrammetry for stockpile volume measurements? High-resolution images give you more details of the mapped stockpiles These top mining companies claim that by applying the photogrammetry workflow with Pix4Dmapper, they can achieve measurement accuracies of around 2-5% for their stockpile volumes. Of the biggest 40 mining companies announced in PWC’s mining report, nearly half of them use Pix4Dmapper photogrammetry software for stockpile measurement and volume comparison as part of their mining workflow.Ĭalculating and managing stockpile inventory, that is, finding a solution for accurate volume measurement and easy inventory management, is one of the biggest challenges in the mining industry. Speed and accuracy: that's the reason why most of the largest mining companies use drones and photogrammetry software in their workflow.
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