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Volume between TIN models - from drawing

Use this tool to calculate volumes between two TIN models (Triangle surface models)

MOUS_ICO Menu: Landscape > Quantities > Volume between TIN models - from drawing
MOUS_ICO Toolbar: Quantities: Volume between TIN models - from drawing

The function calculates volumes between two TIN (Triangle) surface models available in AutoCAD drawing. One surface is considered to represent the designed surface and the second surface is considered to represent the existing terrain surface. Layers where TIN models locate may be frozen or turned off.

  • The triangle models must be available in the drawing in separate layers and triangle object type must be 3D Face.
  • Program uses surface elevations on both the models as well as the positions where triangle edges of the two TIN surface models intersect, if any.

The function will create a calculation boundary by creating a vertical interpolation of selected triangle models and detecting positions where two models have common position in X and Y (See Illustration Picture 1 shown below).

In case of partial overlap surfaces, a boundary line will be created automatically, as union of two models. User may use additional boundary line as well; outer boundary and island (inner) boundary line are accepted.

Description of how the volume is calculated in the "background"

Volume difference of two models is calculated by first creating volume for both TIN models using zero level as reference surface and then deducting one surface model volume from the other (see illustration pictures 2, 3 and 4).

This method gives accurate volumes between the two triangle models. Accuracy is depended on the quality of primary data used for generating triangle models.

Calculate dig area under given depth

This option will report the theoretical area (Square metre) of cut areas for given depth. Method is useful for calculating rock blasting areas that requires special drilling pattern. Solid volumes of dig (cut) under given depth is also reported.

To get the Volume and Area where the depth is under the specified depth, insert data to the report template. Mark the check box Calculate dig area under and define the depth. Click on the button Edit report template to define the report set-up.

Scroll down to the line that says: 'Dig 2D area where dig depth is below specified threshold'. Click insert to put the calculated information in to the Report.

Procedure

  1. Create triangle model for designed surface and existing terrain surface. Select Novapoint Terrain Model Triangle Model. Draw both models are to be drawn in separate layers. Use descriptive layer names like “TIN_designed_Surface” and “TIN_Existing_Terrain”. For detailed help on Generating Triangle Models, see the help file of the menu Novapoint.
  2. Run the function Volume between TIN Models from Drawing.
  3. Select the Layers on which TIN models are located to calculate using the button 'Select' for each surface model respectively. Execute calculation by clicking OK.

After calculation the following information is displayed in the pop up window 'Report':

  • New Surface: Name of designed surface layer, 2D and 3D areas (m2)
  • Existing Surface: Name of existing surface layer, 2D and 3D areas (m2)
  • Fill: The amount of material that has to be removed.
  • Cut: The amount of material that has to be added.
  • Total difference: Volume difference between the cut and the fill. For example, if a volume is 9400.0cubic metre (cum) of cut and 2300.0cum of fill, the net is –7100.0cum (cut will be shown as negative net and fill as positive net).

en/np/landscape/menu/quantities/volume_between_tin_models.txt · Last modified: 2009/07/17 06:24 by vn_se_spe