Three-dimensional trend chart is a visual tool to show the changes of data intuitively, and it is helpful to better understand the data through graphic presentation.

When observing 3D charts, we need to pay attention to the following points:

1. Observe the overall trend: pay attention to the overall trend and see whether the data is up, down or fluctuating.

2. Observe the change range: pay attention to observe the change range and speed of various data to judge whether the change fluctuates greatly.

3. Correlation analysis: observing the correlation between different data through the changes of 3D charts is helpful for further data analysis.