Fig. 1. Illustration of calculating pixel's spectral anomaly index and spatial structure anomaly index

Fig. 2. Flow chart of SSAD algorithm

Fig. 3. Experimental data 1. (a) Grey-scale map of the 130th band image; (b) spatial distribution map of targets

Fig. 4. Experimental data 2. (a) Grey-scale map of the 30th band image; (b) spatial distribution map of targets

Fig. 5. Experimental data 3. (a) Grey-scale map of the 100th band image; (b) spatial distribution map of targets

Fig. 6. Comparison of detection results on data 1 with different anomaly detection algorithms. (a) RX algorithm; (b) CRD algorithm; (c) LSMAD algorithm; (d) SSAD algorithm

Fig. 7. Comparison of detection results on data 2 with different anomaly detection algorithms. (a) RX algorithm; (b) CRD algorithm; (c) LSMAD algorithm; (d) SSAD algorithm

Fig. 8. Comparison of detection results on data 3 with different anomaly detection algorithms. (a) RX algorithm; (b) CRD algorithm; (c) LSMAD algorithm; (d) SSAD algorithm

Fig. 9. Comparison of ROC curves for different anomaly detection algorithms. (a) Data 1; (b) data 2; (c) data 3