Volume Compare calculates a volume using a previous dataset or imported design surface as the base. 

Volume Compare is useful for measuring progress and change or producing accurate measurements when a prework flight or design surface is available to use as a base level. 

Examples include:

  • Measure stockpiled material on an uneven surface using a previous flight or imported design as the base.
  • Measure earthworks progress from one claim period to another. 
  • Measure landfill cell conformance to design.
  • Create dynamic cut/fill or takeoff maps

How to use Volume Compare to compare one dataset to another

  • Select the dataset you want to use as your baseline from the Dataset dropdown list.
  • Draw a Polygon around the area of interest, then click volume measurement in the annotation panel. 
  • Select Volume Compare from the dropdown list of volume measurement types.
  • The Volume Compare tool shows the direction of the comparison, between past (older) and future (newer) volumes. Cut shows how much has been removed from the older dataset to the newer dataset, and Fill shows how much has been filled from the older dataset to the newer dataset.
  • When comparing a current dataset to an older dataset, the Fill value is the volume added to the selected area and the Cut value is the volume that has been removed. If the amount of material in the region has increased, the Net volume is shown as positive. 
  • When comparing an old dataset to a new dataset, the Cut, Net, and Fill values will be positive. Cut is the value removed from the old dataset to reach the new dataset, and Fill is the value added since the old dataset to reach the new dataset.
  • By selecting the Dynamic Cut/Fill Map toggle the same area can be visualized using a heatmap to better highlight areas of greater and lesser cut and fill, as can be seen below. The dark red areas are mounds of stockpiled filled that have been flattened in the period between datasets. The blue areas are being filled by the contractor to reach design level conformance, while uncolored areas have not changed in the period between the two datasets. 

How to use Volume Compare to a dataset against a design surface

  • Select the dataset you want to use as your baseline from the Dataset dropdown list.
  • Draw a Polygon around the area of interest, then click volume measurement in the annotation panel. 
  • Select Volume Compare from the dropdown list of volume measurement types.
  • Select a Design surface from the dropdown list.
  • The red cut value shows where material needs to be removed  to reach the levels represented by the design surface while the blue fill value indicates areas where additional volume is required to reach the design surface level. Unshaded areas represent areas that conform to the same levels as the design. 
  • Selecting the Dynamic Cut/Fill Map toggle creates a visualization with a greater level of detail, better highlight areas where greater and lesser cut and fill is required to reach the design level.

Did this answer your question?