A Reference Level Volume allows you to measure a volume from a predefined horizontal plane at a specific known height above your site's datum. 

A Reference Level Volume is useful for measuring sections from a known base or toe. Examples include:

  • Cut volumes from the base of an excavation.
  • Benches, pit walls, and ramps in mines, quarries, or landfills. 

How to use Reference Level Volume: 

  • Draw a Polygon around the area of interest, then click volume measurement in the annotation panel. 
  • Select Reference Level Volume from the dropdown list of volume measurement types.
  • Enter a height (the Reference Level) relative to your site's vertical datum into the textbox below the measurement type. 
  • The below measurement compares the selected ballast material to an RL of 0m based on the site's defined datum. A horizontal plane is drawn at 0m and shows the difference between the selected feature and the RL of 0m.
  • By changing the reference level used for the measurement it's possible to model a situation where material needs to be added or removed to a greater or lesser depth. Below the same area is measured, this time using an RL of 2.33m, showing considerably less volume due to being 2.33m shallower than the RL of 0m in the first measurement.   
  • In the example, 576m³ of material would need to be removed to reach the reference level of 2.33m so the net value is shown as a negative value of -576m³ cubic meters.

The difference between Smart Volume and Reference Level Volume

  • Smart Volumes allow for the measurement of stockpiles on ground that has a slope. (e.g., gravel dumped on a ramp or other sloping surface).
  • A Smart Volume takes into account the sloped surface by using polygon triangulation to interpolate the base of the stockpile from the elevation of the surrounding terrain.
  • A Reference Level Volume uses a horizontal plane projected from a a Reference Level. Measuring material stockpiled on a slope using this tool would include a slice of the terrain beneath the stockpile as can be seen in the diagram below.  

Learn more about the three types of volume measurement.

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