Figure 6
From: Protein surface representation and analysis by dimension reduction
Hemisphere and its 2D mappings: A hemi-spherical surface (left) is obtained by cutting the sphere with a plane through its center. The hemisphere is mapped using PCA (middle) and using sinusoidal cartography (right). Both PCA and sinusoidal cartography are able to preserve the local geometric properties of the points better than the spherical mapping case.