Temporal and Spatial Characteristics of Urban Morphological Evolution in Chenggong District of Kunming Based on GIS

Abstract

In recent years, with the acceleration of urbanization and the rapid growth of urban population, the impact of urban human activities on the ecological environment system has become more and more significant. How to scientifically to analyze the evolution characteristics of urban spatial form and demarcate the urban extension boundary scientifically and reasonably is of great significance to grasp the urban development context, construct a scientific and reasonable urban spatial form framework and guide the healthy and sustainable development of the city. This paper takes the Chenggong District of Kunming City, which has been developing rapidly in recent years, as the research object. It uses the Landsat remote sensing satellite image data onto different periods to extract the information on the land use type of the study area, and then combines the GIS technology to analyze the temporal and spatial characteristics of the urban form evolution in the Chenggong District. Finally, qualitative analysis is carried out in the aspects of the natural environment, policy orientation, economy and society in combination with the evolution of urban form. After introducing the four types of indicators: extended annual speed, extended dynamics, extended intensity and extended comprehensive index, the urban form evolution of Chenggong District was quantitatively analyzed. It was found that Chenggong District was in the stage of rapid development of urbanization in the past 15 years. There is obvious differentiation in the pattern, the southwest and northwest directions are the main expansion directions, and the southeast direction is the slowest. Natural factors have greatly restricted the expansion of Chenggong District. The development of economic construction and policy planning has become the main driving factors for urban land expansion and space-time evolution.