Journal of Geo-information Science >
Point Pattern Analysis of Urban Buildings in Nanjing old Town
Received date: 2015-04-10
Request revised date: 2015-06-02
Online published: 2015-11-10
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Urban architecture is an important ingredient of urban morphology, and the building height has an important influence on 3D urban morphology. Nowadays, many researches have focused on 2D urban morphology, but only a few studies focus on the 3D morphological characteristics and the spatial distribution pattern of urban cities. Also, studies on utilization and organization of the air space above cities are scarce. Based on urban digital elevation model (UDEM) of Nanjing old town, the urban architectures were simplified and transformed from rectangle representations into 3D point elements, and then were classified into four types of point groups according to the building height. The 3D macroscopic characteristics and spatial distribution pattern of the Nanjing old town architectures were studied using point pattern analysis method. The results showed that: (1) the building distribution pattern in Nanjing old town was clustered in the order shown as follows: low-rise buildings > high-rise buildings > multistory buildings>ultra-tall buildings. Except for super-tall buildings, the cluster degree for the other three types of buildings increased firstly and then decreased, and the highest value appeared at 1.5km, indicating that the block unit at this spatial scale was the most appropriate unit for urban planning in Nanjing old town. (2) The building height distribution in Nanjing old town showed three high-valued areas which were in the New Model Road, Xin Jiekou District and Zhu Jiang Road, and one low-valued area which appeared in the Jiqing Arch Street. All of them have good corresponding relations with the city center in different historical periods, and the distribution of building height also has a correlation with urban benchmark land price. The above results further demonstrated that the point pattern analysis is an effective method to analyze the characteristics of urban construction in planar and three-dimensional space, which is helpful for studying urban morphology characteristics.
Key words: point pattern analysis; building height; space scale; Nanjing old town
YE Juanjuan , YANG Xin , XIONG Liyang , YAN Yanzi , WANG Tingting . Point Pattern Analysis of Urban Buildings in Nanjing old Town[J]. Journal of Geo-information Science, 2015 , 17(11) : 1404 -1411 . DOI: 10.3724/SP.J.1047.2015.01404
Fig. 1 Distribution of construction points in study area图1 实验样区建筑点图 |
Tab. 1 Details of different types of buildings表1 不同种类建筑情况表 |
建筑类型 | 低层建筑(<10 m) | 多层建筑(10~24 m) | 高层建筑(24~100 m) | 超高层(>100 m) |
---|---|---|---|---|
建筑数量(栋) | 9485 | 11 680 | 1238 | 18 |
所占比例(%) | 42.3 | 52.1 | 5.5 | 0.1 |
Fig. 2 Global polynomial profile sketch图2 全局多项式剖面示意图 |
Tab. 2 NNI of different types of buildings表2 建筑平均最邻近比率 |
建筑类型 | 低层建筑 | 多层建筑 | 高层建筑 | 超高层建筑 |
---|---|---|---|---|
最邻近比率(NNI) | 0.41 | 0.72 | 0.47 | 0.91 |
Fig. 3 Construction points distribution and Ripley's K results图3 建筑点分布及其多距离空间聚类图 |
Fig. 4 Construction trend of Nanjing old town图4 南京市老城区建筑总体趋势图 |
Fig. 5 The fitting trend surface of Nanjing old town图5 趋势面拟合图 |
Fig. 6 Standard land price of Nanjing old town图6 南京市老城区基准地价图 |
Fig. 7 Statistical figures of land level for different types of buildings in Nanjing old town图7 南京市老城区不同类型的土地级别统计图 |
The authors have declared that no competing interests exist.
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