How to calculate volumes on PIX4Dcloud

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PIX4Dcloud's volume measurement tool measures the volume between a selected base surface and the digital surface model (DSM).

 
Warning
Under one of the following conditions, calculating volumes is not possible and an error is displayed:
  1. No DSM is available.
  2. The base surface is out of the area covered by the DSM.
  3. The coordinate system of the project is a projected one.

How to create a new volume

To start drawing a new volume:

  1. (Optional) On the left panel, select the Annotations group where the volume should be added.
  2. In the 2D or 3D view, select the volume tool:
    1. By clicking volume.jpg.
      Add_a_volume_in_PIX4Dcloud.jpg
    2. Alternatively, on the left panel, click add.jpg to add a new annotation to the selected Annotations group and select Volume.
  3. Draw the base surface of the volume that must be calculated, by left-clicking to mark its vertices. With each click, a vertex is created and the volume base surface is formed. Double-click to complete the polygon.
  4. (Optional) To mark the vertices more accurately, select the volume from the Annotations list on the left panel or click ic_cursor_black.png on the toolbar. Correct the position of the vertices by drag-and-drop to move a vertex or click the plus sign between two vertices to refine the perimeter.
  5. Once the polygon has been drawn, specify how the base surface elevation should be determined according to the points of the polygon.
 
Note: When changing the base surface type, a preview in the 3D view is visible.

Base surface review in the 3D view of PIX4Dcloud

Base surface 3D preview for a volume on PIX4Dcloud.

  • Average: The base surface is parallel to the XY plane with altitude at the average altitude of all vertices. 
  • Custom: The base surface is parallel to the XY plane with altitude at a custom altitude. Recommended option when the stockpile is surrounded by walls and only part or even no boundary is visible, but the altitude of the flat base surface is known. 
  • Fit Plane: Fits a plane to the vertices, so that all vertices are at the minimum distance from the base surface. Recommended option when the entire boundary of the stockpile is visible and the base surface is a hard surface, a slope, or flat with the same altitude. 
  • Triangulated (default): It connects all the vertices and triangulates the volume above and below the base surface. Recommended option when the entire boundary of the stockpile is visible and the surface is relatively flat.
  • Highest: The base surface is parallel to the XY plane with altitude at the highest altitude of all vertices. Recommended option when the desired computation is the fill volume of a bunker, a pool, a pond, etc. 
  • Lowest: The base surface is parallel to the XY plane with altitude at the lowest altitude of all vertices. Recommended option when part of the boundary is not visible, for example, the stockpile is partially surrounded by walls. 
 
Tip: For more information on which base surface is recommended to measure your volume: Which Base Surface is recommended for the Volume Calculation?

On the right, details about the volume and its base surface are displayed. For more information: 2D/3D tools and annotations.

How to calculate the volume

Once the base surface is set, click Calculate volume to trigger the volume calculation.

Calculate_volume.jpg

Triggering the volume calculation.


After the calculations are computed, they are displayed on the right panel. Changing the base surface type and editing the base surface polygon will automatically trigger a new volume calculation.

Calculated_volume.jpg

A volume calculated on PIX4Dcloud. The base surface uses the Lowest method.

 
Note: Volume surface displayed with blue areas represents the fill volume, whereas red areas represent the cut volume.

The following information is displayed:

  • Cut volume [units3]: Volume that is above the volume base. The volume is measured between the volume base and the surface defined by the DSM.
  • Cut error [units3]: Error estimation of the cut volume.
  • Fill volume [units3]: Volume that is below the volume base. The volume is measured between the volume base and the surface defined by the DSM.
  • Fill error [units3]: Error estimation of the fill volume.
  • Volume difference [units3]: Volume difference = Cut volume + Fill volume.

For more information about how the error is computed: Error estimation in volume calculation.

How to share or export the volume

Volume calculations can be exported as Annotations layers. For more information: How to export/import annotations on Pix4Dcloud.

PIX4Dcloud datasets with volumes can be shared using the link generated after clicking Share in the upper-right corner. For more information: Share.

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2 comments

  • Dominic Fillion

    Hi, 
    I am having a problem to calculate volume on this project: https://cloud.pix4d.com/dataset/781809/model

    Everything is uploaded, .xyz, obj, jpg, dsm ortho .las, I have tried to create a new project but still it's not giving a volume, only aera, thanks for your help !

  • Yuka (Pix4D)

    ​Hi Dominic, 

    The first .xyz file you uploaded was a point cloud file which was not the required offset file. 
    (I assume you have figured this out already as I can see that volumes were calculated.​)

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