Now, when you compare those measurements, you will be comparing the same area, location and volume, thus resulting in the most accurate change-over-time calculations! Understanding the Calculations
This is done in the same way we copy annotations simply select that option from the drop-down menu.Ĭongrats! You have now copied annotations from a previous flight. You now also have the ability to import annotations from a selected map into a current map.
Finally, from the drop-down menu within the Copy Annotations field, select "Copy selected annotations to" and then select the appropriate map date.In this case, all annotations have been selected. You will want to select the annotations that you wish to copy from one map to another.Go to Annotations and the option to copy annotations will be at the bottom of the menu. Navigate to the map you wish to copy annotations to. When you fly the site again, you will have a second map that you can now copy annotations to. Select the first map and pile you'd like to measure and create your initial measurements.This can be done natively within our app! For instance, if you have piles changing on a daily, weekly, or monthly basis you may want to consider copying annotations from map to map. Copying AnnotationsĬreating identical annotations is important for change-over-time mapping. Here, the Elevation Toolbox is useful when defining perimeters. Notice the pile to the left of the main stockpile which is nearly invisible in the orthomosaic. Using the Elevation Toolbox (on the right), the small pile becomes easily viewable, enabling you to avoid defining a point of the base on top of the rocks.
Defining the base layer on top of the small rock pile would lead to inaccurate volume calculations. In the Orthomosaic (on the left) it is difficult to see the small pile of rocks to the left of the stockpile. To more easily see the nuances in the terrain, we recommend using the Elevation Toolbox as the base layer of the map when computing volumes.īelow is an example that demonstrates why using the Elevation Toolbox is a best practice when calculating volumes. Sometimes it can be difficult to see the base of a stockpile when looking at the Orthomosaic image, due to shadows or similarly colored surrounding areas. For example, accidentally selecting a point on a pile of rocks, as opposed to on the ground, will change the volume calculation and its accuracy. This means that the elevation of the points you select is very important. This is perfect for long thin stockpiles, or for large stockpiles over 0.5 acres in size.Īs you'll see in () - the volume is calculated by creating a surface which fits within the area you define. Triangulated joins up all of the edge points to create a 3D surface under your stockpile. If the ground is slightly sloped then, this can distort results. The lowest point base plane is very sensitive to the vertices of the volume annotation being created and assumes the ground under the annotation is very flat. This option is more suited to calculate the volume of benches or stockpiles on flat ground in bins, or where there are neighboring piles right up against each other. Lowest Point calculates a horizontal base plane from the lowest edge point. It's great for stand-alone stockpiles in most situations on flat ground. Linear Fit (formerly "Best Fit") defines the base plane by fitting a perfectly flat plane, in 3D, through the chosen edge points. There are three base-plane options available for volume calculation Linear Fit, Lowest Point and Triangulated.
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