GIS Based Analysis on Emergency Shelters Capacity of Urban Greenspaces in Sanming City

The sheltering capacity of the greenspace refuge system in the builtup urban area of Sanming City was analyzed by means of applying ARCGIS spatial data management and spatial data analysis tool interfaces. The results showed that only 47 pieces of greenspace out of the total 106 were located within the safe urban space, whose total area was 126.32hm2. The effective refuge area in built-up area of Sanming City was 84.65hm2 in total, and the per capita index was 2.72m2. When the people of the five population groups of Sanming City were superimposed, the synergetic rate per capita of the five population groups was 1∶2∶2∶8∶5. Inside the builtup area, the residential area covered by the buffer zone that was extracted from the emergency shelters by 500m as service radius was 2311hm2 The refuge shelters were unevenly distributed, the unit area index in some sections in the builtup area was 50% lower than the average. The analysis on the refuge shelter greenspce distribution by 3min, 5min, and 10min escape distance after disaster occurrence showed that there was still 5.4% of the population would not be covered by the refuge shelter system and the accessibility among the population groups was comparatively weak.