Figure 11

Each box shows a pair of NMF basis vectors \(w_{k}\) (left) and \(h_{k}\) (right). From top to bottom: \(k=1,2,3\). In each box, the left figure shows the vector components of \(w_{k}\) mapped onto a geographical map (lake and sea shown in blue), which represent how sources of the kth NMF component are distributed spatially, while the right figure shows the components of \(h_{k}\), which represent how destinations of the kth NMF component are distributed spatially. The grayscale colorbar in each figure indicates magnitudes of the corresponding basis vector’s components after normalizing the vector by its Euclidean norm. Also shown in each figure is a small circle which corresponds to the maximum vector component. City name in each box was identified with the location of the circle