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Table 1 Top nodes by numbers of datapoints included, and average node feature values, of the tree species data with 400 datapoints from each tree sample

From: A topological data analysis based classification method for multiple measurements

Node number

Datapoints

Purity

Branch order

Branch length

Branch height

Branch angle

17

23479

0.405

2.570

0.612

14.202

1.532

18

22887

0.604

2.627

0.655

17.436

1.511

14

22668

0.581

2.481

0.543

11.141

1.505

22

17634

0.766

2.710

0.650

20.322

1.494

10

13763

0.634

2.264

0.559

8.145

1.467

7

4481

0.536

1.641

0.758

5.076

1.393

6

3535

0.778

2.956

0.392

4.864

1.485

26

2614

0.600

1.947

0.860

23.349

1.453

2

2317

0.556

1.634

0.669

2.129

1.237

25

1821

0.784

3.484

0.439

23.041

1.543

9

1523

0.724

4.292

0.298

7.843

1.520

3

839

0.770

2.771

0.390

2.594

1.851

12

781

0.647

4.702

0.289

11.031

1.933

  1. 1Purity is defined as the highest proportion of datapoints in the node that come from a single class.
  2. 2Branch order is the level of branching: 0 for trunk, 1 for branches originating from trunk etc.
  3. 3Branch length is the branch length in meters.
  4. 4Branch height is the height of branch’s starting point above ground in meters.
  5. 5Branch angle is defined as the angle between branch’s direction at its starting point and upward z-direction in radians