When browsing the scene or analyzing it in 3D, you can use the calculation controls provided in the interface to assist you in your operations. The following is a detailed description of how to use the Calculate function.
Measurement
You can measure distance, area and height. Click on the 
buttons in the upper toolbar to perform calculations.
Spatial Measurement
- Spatial distance: Measure the straight line distance in the scene.
- Height: Measure the height in the scene. If there is terrain data in the area, the height is the height of the considered terrain; otherwise, the starting point of the height measurement is the surface of a smooth sphere.
- Spatial area: Measure the area in the scene. The area value is obtained by calculating the coordinate points of the measurement area without considering the terrain undulation.
Ground-based Measurement
- Ground-dependent distance: when the area to be measured has terrain data, it is the distance according to the terrain undulation; otherwise, it is the spherical distance.
- Ground-based area: Measure the area in the scene. If there is terrain data in the area to be measured, it is the area of terrain undulation.
- Projected Area: Measure the projected area in the scene. The area value is obtained by calculating the latitude and longitude values of the coordinate points in the measurement area without considering the topographic relief and the height of the coordinate points.