CUT AND FILL VOLUME ANALYTIC
DataHub creates 3D models of your sites based on the point clouds generated by our photogrammetry engine. Thousands to millions of points are interpolated to create a high-resolution reconstruction of your captured area. The outputs are then made available for DataHub tools that can help you analyze your data further.
In this article we will explain how to use the cut and fill volume tool in DataHub to compare volumes of two terrain surfaces or a surface versus a design file.
How to use the Cut and Fill Volume Analytic
You may access the Analytics section of DataHub either through the quick menu in the lower right corner (Blue + Button) or by clicking on the add button beside Analytics menu in the left sidebar (Create New Analytic - Cut and Fill Volume):
1. You can upload a geometrics file that contains the corner coordinates the area you would like to select. This will automatically generate the polygon of the area of interest.
To download a geometrics file from an old analytic, open the analytic and click on the menu options inside the analytic drawer. Choose between downloading a .csv or .geojson file.
On the other hand, you can also start from scratch by first naming your analytic. In the example below, we are starting from scratch:
2. The app will display an Instruction banner at the top of the 3D map panel. You may now start clicking the map to draw the polygon. Clicking three points will generate a closed polygon.
3. When the initial polygon is created, drag the large circles to a desired shape. To add points, drag the smaller dots in the middle of each polygon side. To delete points, click them once then click the Delete button that is displayed at the point.
4. You can manually adjust the coordinates of the points by selecting the three dots menu of the point you wish to update and choosing Set Coordinates. Additionally, you can click the row in the drawer and look for the red point in the 3D map panel.
5. In the bottom drawer make selections for each of the two surfaces that will be compared. For each surface, you can choose a dataset that has terrain, or a 3D surface design file. This enables the following three configurations:
- Terrain compared with terrain: useful for calculating the change between two data captures.
- Terrain compared with a design: useful for calculating the amount of work remaining to meet the design.
- Design compared with design: useful for calculating the difference between two designs.
Note that the "Compared Surface" is the initial volume while the "Reference Surface" is the end result when the Compared Surface is cut or filled.
6. When done, click Done to save your progress and calculate the volume measurements for the polygon. These values will be displayed in the bottom drawer.
7. To enter a density and get mass values, click the Edit button at the top right of the bottom drawer to enter edit mode. Click Add Density, enter the value, then click Done. The calculated mass value will be displayed for each volume value.
Editing the Cut and Fill Volume Analytic
- To edit the points of the polygon (move, delete, or add more points) or edit the selected surfaces, enter edit mode and make the changes then click Done.
- To change the elevation value associated with each color of the heatmap (“thresholds”), enter edit mode and click the value you wish to change, then click Done. The heatmap will update accordingly.
- To rename or delete the analytic, click Done, then click the three dots button to the right of the Edit button.
- To download the calculation results in a CSV file, click the three dots button to the right of the Edit button and choose Download Results.
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