The filtered points are used to create a mesh of data points. The app then filters the points on the 3D model that are inside the polygon from other points on the model. When the user draws a polygon around a stock pile, the app records the points clicked by user to draw the polygon and the elevations at those points. The base plane is not a single plane, but a set of triangles. It will run triangulation algorithm on the polygon, and calculate volume based on triangulated base planes. Triangulated Fit : It works for large and long stockpiles.Manual options can be used for stockpiles that are in slope OR on a inclined plane. Manual allows you to enter custom elevations, Grade and Azimuth values by rotating the base plane either by directly input Elevation, Grade and Azimuth values or by dragging in the 3D model.It sets the bottom plane as a horizontal plane with an average elevation of all the clicked points. Average Fit works for stockpiles which sits on a flat ground and have a clear visible boundary.On the other hand, if polygon points are clicked on the top of a stock pile, it could bring a larger difference. If you are not certain about the stock pile boundary, just include more ground area. Including extra ground area will not bring any significant difference for this method. Note: You can always select points on the surrounding ground surface. It will generate a best fit plane from all clicked points and calculate the volume based on best fit plane. Linear Fit is the best method for stockpiles which have clear boundaries and located on a flat ground.It will set the bottom horizontal plane at the elevation of the lowest point has been clicked. Lowest Fit means a horizontal base plane at the lowest elevation of the boundary points. Lowest Fit is the most common used type for stockpiles which are heaped against a bench or other objects. Strayos platform provides five different base plane for volume calculation for stockpile reporting. The Digital Terrain Model excludes the conveyor belts. Due to this nature, the DTM is very useful for measuring stockpile volumes accurately when there are conveyor belts overhead.Ĭomparison of Digital Surface Model (left) and Digital Terrain Model (right). The DTM contains only the terrain elevation values. The Digital Terrain Model (DTM) is also a computer generated representation of the terrain’s surface but unlike the DSM, the DTM excludes any objects on the surface like buildings,trees,vegetation and equipment. DSM provides accurate elevation values with more resolution and therefore provides accurate volume measurements. DSM takes into consideration the objects on the terrain like cars, conveyors, buildings, trees,vegetation and other equipment. The Digital Surface Model (DSM) is a computer generated representation of the terrain’s surface. This model can be used for both visualization of the surveyed site as well as for volume measurements. The 3D Model is a high quality reconstruction of the surveyed area generated by stitching together the images captured by the drone. Strayos provides three different volume calculation surfaces - 3D Model, Digital Surface Model (DSM) and Digital Terrain Model (DTM). Users can select among a combination of different surface layers and base planes to accurately calculate the volume in different use cases. Strayos provides multiple options for calculating the volumes of stockpiles.
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