# Using TIN – interpolation plugin – to calculate volume

Geographic Information Systems## How to calculate volumes in QGIS?

**Calculate Volume from Interpolated/Best Fit Surface.**

- After opening a new QGIS project, we will start by importing a DEM/DSM raster into the map.
- Create Clip Feature Layer.
- Digitize Clip Area.
- Add Z-Values to Clip Layer.
- Create Interpolated Surface.
- Clip TIN Surface to Clip Area Polygon.
- Calculate Elevation Change.

## How to calculate raster surface volume in QGIS?

**How to Calculate Raster Surface Volume in QGIS**

- Open Processing Toolbox, then select Raster analysis and choose Raster surface volume as in figure 5. Figure 5.
- The Raster surface volume window will appear as in figure 6. In Input layer parameter, select a DEM to be calculated, for my case pile_dem.
- Click Run button.

## How to install interpolation plugin in QGIS?

**Using the plugin**

- Start QGIS and load a point vector layer (e.g., elevp.
- Load the Interpolation plugin in the Plugin Manager (see Section Loading a QGIS Core Plugin) and click on the
^{Interpolation} - Select an input layer (e.g., elevp.

## How do you calculate volume in GIS?

**Cut and fill volumes are calculated from the difference between the digitized feature and the defined base surface**. Ground features below the base surface result in fill values, and above ground features result in cut values. The total volume measurement is cut value + fill value.

## How do you calculate all volumes?

Whereas the basic formula for the area of a rectangular shape is length × width, the basic formula for volume is **length × width × height**. How you refer to the different dimensions does not change the calculation: you may, for example, use ‘depth’ instead of ‘height’.

## How do you calculate volume from dem?

**v = (DEM _{2} – DEM_{1}) * A**, where A is the pixel area. The total volume change is the sum of all resulting pixel values.

## How do you find the volume of a raster?

Convert the raster to a polygon so you can calculate the area of the raster. Then convert the raster to a point shapefile to calculate the average depth. **The volume is the area multiplied by the average depth**.

## How do you find volume with coordinates?

Quote from video: *Minus x1 squared plus y2 minus y1 squared plus z2 minus z1 squared.*

## How do you calculate volume from dem?

**v = (DEM _{2} – DEM_{1}) * A**, where A is the pixel area. The total volume change is the sum of all resulting pixel values.

## How to do calculations in QGIS?

**This can be done very easily with the Field Calculator tool.**

- Open Field Calculator. Open the field calculator by clicking the icon on the attribute table toolbar.
- Define Name and Data Type for a New Field.
- Enter an Expression to Calculate Geometry.
- Run the Expression.
- Turn off Editing Mode.

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