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Essential Graphing > Contour Plots > Additional Example of Contour Plots
Publication date: 11/10/2021

Additional Example of Contour Plots

This example illustrates how to create a triangulation data table, to transform the triangulation to use Delaunay triangles, and to filter Alpha shapes of the triangles.

1. Select Help > Sample Data Library and open

2. Select Graph > Contour Plot.

3. Select OZONE and click Y.

4. Select X and Y and click X.

5. Select to Fill Areas.

6. Click OK.

7. Click the red triangle next to Contour Plot for OZONE and select the following options:

a. Transform > Range Normalized

Instead of Delaunay triangulation, this changes the method for calculating the triangulations to a normalized scale ([0,1]) in both X and Y.

b. Show Control Panel

The Alpha slider appears.

Figure 10.11 Contour Plot for OZONEĀ 

Contour Plot for OZONE

8. Click and move the Alpha slider to the right.

Figure 10.12 Alpha Shapes FilterĀ 

Alpha Shapes Filter

Using the Alpha slider filters out the larger Delaunay triangulation areas.

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