Tile-Based Semisupervised Classification of Large-Scale VHR Remote Sensing Images

Figure 2

Illustration of graph Laplacian building. (a) Sample graph with 6 vertices and 7 edges. (b) Laplacian matrix. (c) Spectral graph Laplacian. Each tile (a node in the graph) is connected to the k-most similar tiles. (d) Spatial graph Laplacian, each tile (a node in the graph) is connected to its 8 neighbours.