Multi-scale Spatial Analysis of Valley City in Northwest China Based on GIS - Taking Yan'an as an Example

摘要

This article takes typical Valley City in Northwest as the research object and takes Yanan as an example. Firstly, the urban space is analyzed and divided during the thinking of multi-scale science, and then the image of Yanan in 2011 is interpreted and the internal space and external morphology can be quantitatively analyzed at multiple spatial scales using the method of GIS. The analysis shows that different feature of land use types in different scale space and terrain on different land use types distribution impact. The research findings are meaningful for the spatial expansion, update and spatial layout of the valley city in Northwest and contribute to the healthy development of the city in northwest area.