Fig. 1. Research frame work for assessment and analysis of the phenomenon of vacancy

Fig. 2. Pre-processed night-time light and coherence of Wuhan city

Fig. 3. Classification process of function of street-block of Wuhan city

Fig. 4. Visualization of vacancy index of Wuhan city

Fig. 5. Vacancy index, night-time light, coherence, street view in four areas

Fig. 6. Visualization of influencing factors for the phenomen on of vacancy of Wuhan city

Fig. 7. Relationship between parameters of random forest model and model accuracy

Fig. 8. Refined vacancy index of Wuhan city after random forest fitting

Fig. 9. Analysis of vacancy index of subdistrict office and the importance of influencing factors for the phenomenon of vacancy