Surface volume

Instructions for use

Used to compute the grid surface volume, that is, the volume in space between the Raster Dataset fitted 3D surface and a datum plane within the selected polygonal area.

To calculate the surface volume, you need to specify Datum Elevation. The datum elevation is the elevation value of the datum level, which is the starting datum for measuring the height of the volume. As shown in the figure below, when the datum elevation is given as 50m, the volume after measurement and calculation includes the volume of three areas A, B and C enclosed by the grid on the datum plane, that is, volume = A + B + C; when the datum elevation is given as 100m, the volume after measurement and calculation is the volume of area A.

Figure: Surface volume for different base elevation values

Operation steps

Surface Volume

  1. Open the Raster Dataset in Map for which you want to calculate the surface volume. Note: In Current Workspace, if there is no open Raster Data, this function cannot be used.
  2. In the Spatial Analysis tab-> Raster Analysis-> Surface Analysis-> " Surface Volume" subitem, the Output Window prompts: "Please draw a polygon on the map with the mouse. Then right-click to analyze.
  3. Draw a polygon on the map, and click the right mouse button to pop up the Surface Volume Parameter Settings "dialog box. Enter the base elevation in the dialog box. The program defaults that the given datum elevation is the minimum elevation of the specified area. When the datum elevation value specified by the user is greater than maximum elevation of the current measurement range, the program will give an overrun prompt and a range of values.
  4. Click the Calculate button to calculate the volume covered by the temporarily drawn polygons. The Output Window prompts for the set datum elevation and the volume of the analysis area. The default volume unit is cubic meter. The default volume unit is cubic meters. Hold down the Esc key to clear temporary polygon objects drawn in the Map.

Selected Polygon Object Measurement

  1. In the Spatial Analysis tab-> Raster Analysis-> Surface Analysis-> Select Polyon Volume sub-item, A prompt will pop up in the map, "Select one or more surface objects for Surface Measure, and right-click to end the selection.".

    Or You can select one or more polygon objects in Map (hold down the Shift key to select multiple polygon objects), and then click the Select Polyon Volume subitem. The Surface Volume Parameter Settings "dialog box will pop up directly.

  2. Pop up the Surface Volume Parameter Settings "dialog box, and enter the datum elevation in the dialog box. The program defaults that the given datum elevation is the minimum elevation of the specified area. When the datum elevation value specified by the user is greater than maximum elevation of the current measurement range, the program will give an overrun prompt and a range of values.
  3. Click the Calculate button to calculate the volume covered by the selected polygon. The Output Window prompts for the set datum elevation and the volume of the analysis area. The default volume unit is cubic meter. The default volume unit is cubic meters.

Note: When multiple polygon objects are selected, the measurement result is the sum of the surface volumes of the multiple polygon objects. The default volume is in cubic meters. Press and hold the Esc key to clear the polygon object selection in the Map.