- Topology: Encompasses the global shape of the data, and the relations between data points or groups within the global structure
- Google Pagerank Algorithm
- Example: Cosmic Crystallography
- Torus universe (zero curvature)
- Spherical universe (positive curvature)
- Other universe (negative curvature)
- Data: Hyperspectral Imagery
- Gradient Flow Algorithm
- identify neighbor with highest density for each data point (arrow points from that point to that particular neighbor)
- gives a data field
- follow the arrows to identify clusters
- identify neighbor with highest density for each data point (arrow points from that point to that particular neighbor)
people.rit.edu/wfbsma/data/NINJA_MAIN_self_test_refl_RX.img.html
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