The surface chart is used to represent two dimensional data in 3D map. It looks like a topographical map. The higher values are shown as high peaks. It is like a curtain on a 3d column chart.
The colors in the chart does not represent any legend like other chart. The colors represent the group to which that surface belongs. The Surface chart is best used when X and Y axis are numerical ranges.
There are four types of surface charts.
3-D Surface chart
A 3D surface chart looks like a curtain dropped on 3D column charts. This chart is best used when x and y are numerical ranges. To understand it, let's go through an example.
Let's say we have this equation:
Where -1<=x<=1 and -1<=x<=1
In above equation, x and y ranges from -1 to 1. Using this equation we have prepared a table in excel.
To create this table we used above equation. The third row represents the values of x and B column represents values of Y, both in range -1 to 1 with an interval of .5.
To create this table, follow these steps:
The table is ready.
Now the data is ready, let's plot an 3D area chart.
The colors in the chart show the data that fall between a certain range. For example, in above chart, blue color represents values between -2 to -1, orange represents -1 to 0 and grey represents 0-1.
Wireframe 3-D Surface chart
This is same as the 3-D surface chart but without filled color. It looks like frame of colored wires for 3D surface chart.
It is easy to see the backside boundaries in wireframe chart. In 3D surface chart, it was hard to see the backside area from one perspective.
To plot a wireframe surface chart, follow the exact steps as followed in 3-D surface chart. In the end choose wireframe surface chart.
You will have a chart that looks like a frame of wires.
The interpretation is same as 3D Surface chart. In wireframe it is easy to see relations between to points on 3 dimensional surface.
Contour chart is just like watching a 3D surface chart from top. In general, it is very similar to a topographical google map.
In Contour chart, the depth is not that important. You can estimate the depth by evaluating shade and light but it will be tough. The the benefit of contour chart is that you can see areas covered by other ranges.
Follow exact same steps as above and in the end choose contour chart.
Wireframe Contour Chart
The wireframe contour chart is just the contour chart without the colored areas. We can see a web of different colored wires, making a contour chart. It is like seeing a wireframe surface chart from above.
So yeah guys, this how you can use different types of surface chart in excel to represent data visually. In practice, I haven't used these charts much, I may leave some points that you might know. Feel free to add those points in the comments section below. I will include that in the article with your name.
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