Research on Succession of Towns in Disaster-prone Areas Based on Open Data

• 1、School of Civil Engineering and Mechanics，Lanzhou University，Lanzhou，Gansu 730000，China
• 2、 Key Laboratory of Mechanics on Disaster and Environment in Western China，The Ministry of Education of China，Lanzhou University，Lanzhou，Gansu 730000，China

Abstract：The openness of data provides a new idea for the study of urbanization evolution models. Obtain the night light data, POI data, and remote sensing images of the Wenchuan disaster area, use GIS technology to extract the urban light area, use Python crawlers to obtain the POI density, and use satellite imagery to analyze the pre-earthquake urbanization development and discuss the urban evolution pattern after the earthquake. Studies show that: (1) There is a large difference in the urbanization area along the two sides of the Longmen Mountain fault. There is less urban area in the western part of the fault, and more urban area in the east. The development of new lighting area slowed down because of the earthquake. (2) The urban development in the disaster-stricken area can be divided into four modes: original site reconstruction, relocation, original site expansion and contraction. (3) Open data has its own advantages and disadvantages. Comprehensive comparison and analysis of each data is needed to dig out true correct and effective information to better serve post-disaster assessment.

Keywords： Open data urbanization post-disaster reconstruction