基于多源数据的城市休闲旅游空间特征及时空演变分析——以南昌市为例

Spatial characteristics and spatial-temporal evolution of urban leisure tourism based on multi-source data:a case study of Nanchang

基于从百度地图爬取的POI数据以及27年间的夜间灯光遥感影像,利用核密度估计法、多距离空间聚类分析法、最近邻指数法和标准差椭圆算法,以及将POI和夜间灯光数据耦合分析等方法对南昌市中心城区的休闲旅游空间分布进行分析并探讨它的分布特征。通过ArcGIS可视化观察区域各类别服务设施的集聚程度,利用夜间遥感影像数据绘制1992—2018年南昌市重心迁移轨迹对时空演变进行分析。研究发现,南昌市休闲旅游空间各分类NNI均小于1,整体呈现空间集聚;总体空间的椭圆中心分布于东湖区,整个趋势是沿“西北向东南”方向发展,且有显著方向性;南昌市休闲旅游空间的集聚存在空间尺度效应,空间尺度效应随地理距离衰减而变化,POI数据和夜光遥感数据的空间耦合性表现也整体较好;南昌市休闲旅游空间的重心先向西北偏移,再向西南偏移,空间增长以西南部城市为主。

Based on POI data and 27 years of night lighting remote sensing images in Nanchang from Baidu,Ker-nel density estimation method,distance space clustering analysis method,neighbor index method,standard devia-tion ellipse algorithm and the POI and night light data coupling analysis method were used to analyze the leisure tourism spatial distribution and its characteristics of Nanchang.And through ArcGIS visualization,the agglomera-tion degree of various service facilities in the region can be laid out.The gravity center of migration track of Nan-chang from 1992 to 2018 was plotted by night remote sensing image data to analyze the spatial-temporal evolution.It is found that the NNI of all categories of leisure tourism space in Nanchang is less than 1.Moreover,the center of the ellipse of the overall space is distributed in the East Lake area.The whole trend is developing along“north-west to southeast”.The agglomeration of leisure tourism space in Nanchang has spatial scale effect,which changes with the geographical distance.The spatial coupling performance of POI data and noctilucent remote sensing data in Nanchang city is also good.The gravity center of Nanchang leisure tourism space is shifted to the northwest first,and then to the southwest,and the space grows mainly to the west and south.