Volume Calculation

Read about volume computation in SPRING

Volume Calculation:

  • select, in the "Control Panel", an IL from the numerical model which has to have either a regular grid (Grid) or a triangular grid (TIN);
  • select DTM - Volume..., in the main menu to open the associated window;
  • select Grid (rectangular grid) or TIN (triangular grid) as an option for the DTM data;
  • press the Infolayer... button to open the Categories and ILs selection window. In this window, select a Category and an IL, thematic or cadastral, which has one or more closed polygons and press the Apply button, return to the volume calculation window;
  • type in the Z Value;
  • select Total or Partial  for the Calculation option:
    • when using the Total calculation option, the application will compute the volumes for all areas and closed polygons in the IL;
    • when using the Partial calculation option one has to select, using the mouse left button, one or more polygons from the thematic or cadastral selected IL. In this case the application will compute the volume for all selected polygons;
  • press the Apply button to execute the volume calculation. After the computation, you will see a table with some results. This report is presented in the window's results area with the following information for each region (closed polygon):
    • Above Cut-off volume, which is the volume, inside the region, and above a given Basic Height;
    • Below Cut-off volume, which is the volume, inside the region, and below a given Basic Height;
    • Area which is the partial or total area inside the region;
    • Ideal Height which is the Basic Height value that makes the above cut-off volume equals the below cut-off volume.
  • press the Save... button to save the results in a file.
  • press the Delete button to clean the results area.
  • press the Copy... button to recover the results from a file and add them in the results area.

See also:

How to generate a Rectangular grid
How to generate a Triangular grid

Other DTM products in the SPRING