Calculating Volume

Volume calculation in TerraAmazon is done from areas, i.e., closed polygons of thematic or cadastral models and triangle or rectangular grids of the numeric model. From the grid is calculated the central value of each grid cell corresponding to height (z-axis), multiplied by available area value.


Select DIGITAL TERRAIN MODEL → VOLUME in the main menu.


Raster Layer Name: select the input layer.

Dummy Value: check in this box to enter the pixel dummy value. This dummy value will be ignored by the operation.

Vector Layer Name: select the vector layer.

Identifier Attribute: select the attribute to be used in the operation.

To select specific geometries in the theme click on box Use selected geometries by pointing and select wanted geometries on the presentation picture.

Base Quota: enter the maximum value for the quota base to calculate the volume.

Click on the OK button.