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Accessibility Assessment and Space Optimization of Medical Facilities in Pingshan District, Shenzhen City
WANG Hongliang, YANG Yaxuan, GAO Yining, WU Jiansheng
Acta Scientiarum Naturalium Universitatis Pekinensis    2026, 62 (1): 162-174.   DOI: 10.13209/j.0479-8023.2025.115
Abstract （673）   HTML    PDF（pc） （5497KB）（272）       Save
Taking Pingshan District of Shenzhen as an example, this study started from the relationship between supply and demand, combined with mobile phone signaling and point of interest (POI) data, and used the Gaussian two-step mobile search method and p-median model to explore the accessibility and spatial optimization strategies of three types of medical facilities: general hospitals, community health centers and community clinics. The results showed that: 1) the overall spatial distribution of medical facilities in Pingshan District is “unbalanced”. The current medical facilities are mainly located in the central and northern areas of Pingshan District, and there are few in the south. 2) There is a mismatch between the accessibility of medical resources and the distribution of demand. General hospitals and community health centers are mostly distributed in the central area of Pingshan District, and the overall accessibility shows the distribution characteristics of Pingshan Street as the center and decreasing to the outer circle. Community clinics are concentrated in densely populated areas and have uneven accessibility. 3) The areas of high urgency are mostly distributed in Shatian, Tianxin, Biling, Longtian, Jiangling and Zhukeng communities, and the shortage of medical facilities in high‑urgency areas is more severe. 4) Based on the p-median model, the optimal location of three types of medical facilities is determined. The number of optimized grids for general hospitals, community health centers, and community clinics is 30, 32, and 66, respectively, with urgent needs reduced by 71.43%, 55.17%, and 97.06%. After optimization, the three types of medical facilities are evenly distributed across the district.
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Spatial Simulation of Agricultural Land Use Change Based on Agent-Based Model: A Case Study of Tongdu Town, Dongchuan District in Kunming City
YANG Weishi, DAI Erfu, WU Jiansheng, ZHANG Hui, XING Zhaoting, FAN Fan, WANG Hongliang, GUAN Yufeng, CHEN Feng, CHEN Minglei
Acta Scientiarum Naturalium Universitatis Pekinensis    2025, 61 (5): 976-986.   DOI: 10.13209/j.0479-8023.2025.073
Abstract （535）   HTML    PDF（pc） （5000KB）（928）       Save
This study focuses on Tongdu Town in Dongchuan District, Kunming City, and constructs a model for agricultural land use change based on human-environment interactions using an agent-based model. By utilizing census data, geographical environmental data, and field survey data, the study simulates the spatially distinct processes of agricultural labor, annual income of farming households, and agricultural land use changes in Tongdu Town from 2010 to 2015. The result shows that changes in agricultural land use are strongly correlated with labor, household income, and slope, but less so with soil fertility. Approximately 63.35% of agricultural land use changes occurred among low-income farming households, particularly the conversion of farmland to grassland — 87.60% of this specific conversion took place in low-income households. The transition from farmland to forest predominantly occurred in areas with relatively higher population densities and steeper slopes. The simulation model demonstrated excellent performance, with a spatial accuracy of 92.23%. The method developed for simulating agricultural land use changes in this study can offer valuable references for other regions, and thus provide scientific support for the implementation of ecological conservation, rural revitalization, and other related projects in China.
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Evaluation and Impact Factors of Spatial Supply and Demand of Public Sports Facilities in Shenzhen
WU Jiansheng, QIAN Yun, WANG Hongliang, ZHU Huizhen, WANG Han
Acta Scientiarum Naturalium Universitatis Pekinensis    2022, 58 (6): 1101-1110.   DOI: 10.13209/j.0479-8023.2022.088
Abstract （3057）   HTML    PDF（pc） （1886KB）（1643）       Save
From the perspective of 10-minute fitness circle, points of interest (POI), mobile signal data and other data were employed in this research. The accessibility of public sports facilities was measured with network analysis in GIS and Gini coefficient was used to analyze the equity of the supply and demand matching degree of public sports facilities in Shenzhen. The influencing factors of spatial supply and demand of public sports facilities were explored by geographical detectors. The results showed that, first, the overall accessibility of public sports facilities in Shenzhen was relatively high, which basically met the requirements of 10-minute fitness circle. Second, the distribution of public sports facilities was relatively fair. The distribution of facilities in different streets of the same municipal district was highly fair while the equity between municipal districts could be further improved. Third, the relationship between supply and demand in Yantian, Pingshan, Dapeng District was well-matched while sports facilities in the subdistrict at the junction of Futian District and Luohu District were centralized distributed, which set a limitation to the ability of service. Finally, land price was the most important factor affecting the spatial supply-demand relationship of public sports facilities in Shenzhen, followed by the density of road network and the number of bus stops. The total population and the proportion of man-made surface also had a certain impact on the supply and demand relationship.
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Spatial Fitness of Urban Public Resources and Population Distribution: Taking Shenzhen as an Example
WANG Hongliang, WU Jiansheng, GAO Yining, LIU Lu, YANG Weishi, PENG Zifeng, GUAN Qingchun
Acta Scientiarum Naturalium Universitatis Pekinensis    2021, 57 (6): 1143-1152.   DOI: 10.13209/j.0479-8023.2021.088
Abstract （4278）   HTML    PDF（pc） （7336KB）（1787）       Save
Based on the support of the new data environment, the spatial adaptability of urban public resources and population distribution in Shenzhen is analyzed from two aspects of adaptability and matching relationship by using various spatial quantization methods, such as kernel density estimation, nearest neighbor analysis, multidistance spatial clustering, cooperative location quotient and two-step mobile search. The results show that the spatial adaptability of public resources and population distribution in different cities has obvious similarity, which is similar in spatial morphology, distribution pattern and proximity effect. Spatial matching relationship between urban public resources and population distribution is different. The non-matching characteristics of urban public resources and population density indicate the “mismatch” and “dislocation” relationship between supply and demand of urban public resources. Aiming at the spatial adaptability of resource elements, the optimization suggestions for three kinds of public resources, such as park green space, school education and health care, are put forward from two scales of city and community.
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Construction Land Expansion and Its Driving Force in Highly Urbanization Areas: A Case Study of Shenzhen City
WANG Hongliang, GAO Yining, WU Jiansheng, WANG Na, ZHAO Yuhao, PENG Zifeng, WANG Yanglin
Acta Scientiarum Naturalium Universitatis Pekinensis    2021, 57 (4): 707-715.   DOI: 10.13209/j.0479-8023.2021.045
Abstract （2823）   HTML    PDF（pc） （1097KB）（1443）       Save
Based on the survey data of land use change, this paper studies the process and characteristics of urban construction land expansion in Shenzhen from 1996 to 2016 by analyzing the spatial and temporal changes, expansion intensity and landscape pattern of urban construction land, and reveals the spatial differentiation of urban construction land expansion in highly urbanized areas. Regression analysis model is used to explore the driving mechanism of social and economic factors on the expansion of construction land. The results show that the expansion of construction land in Shenzhen presents a continuous growth trend, and the expansion mode of new construction land is significantly different. Futian District and Luohu District are mainly expanded by interior filling, while Nanshan District and Baoan District are mainly expanded by external expansion. The difference between construction land extension intensity in different regions and the index of landscape pattern indicates that the spatial expansion of construction land is gradually changing from disorder, homogeneity, inefficient spread to orderly, heterogeneous and efficient utilization. Social and economic factors have a significant positive correlation with construction land expansion. The regression coefficient of resident population is the largest (0.578), and that of fixed assets investment is the smallest (0.000). Pearson correlation ranking is Resident population > Industrial structure >GDP> Fixed asset investment, indicating that population plays a decisive role in the expansion of construction land, and fixed asset investment is embodied in the function of connection. 
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Research on the Premium Effects of Visible Water Volume on Residential Land Price: A Case Study in Shenzhen
WU Jiansheng, ZHU Jie, LIAO Xing
Acta Scientiarum Naturalium Universitatis Pekinensis    2018, 54 (1): 197-206.   DOI: 10.13209/j.0479-8023.2017.144
Abstract （2204）   HTML （106）    PDF（pc） （21814KB）（1314）       Save

It is necessary to explore the influence of water visibility on land price under the mechanism of Bid Invitation, Auction and Listing in order to provide a reference both for the government to stabilize the market and for the market participants to make rational purchasing decisions. This research selects Shenzhen as the study area and collects the residential land transaction data released by Shenzhen Land Real Estate Trading Center and multiple POI data from Google earth and Baidu map, as well as Landsat data. The study quantitatively analyzes the influence of water visibility on residential land price and discusses the spatial differences of visual water premium effects on the basis of GWR model. The result shows that, the residential land price premium on every 10000 m2’s increase of visual sea area ranged between 0.4 to 0.79 yuan/m2, increasing 0.005%–0.009%, besides, the contribution of per level’s visual reservoir area promotion ranges between 1176 yuan/m2 to 1991 yuan/m2, increasing 13.490%–22.838%, and the visual length of the secondary river network increased every 100 m producing the premium ranges between 122 to 503 yuan/m2, increasing 1.399%–5.770%. The volume of visual water showes obvious spatial heterogeneity on the distribution of Shenzhen’s residential land price. It could be seen that visible lengths of the secondary river network gradually declined from the east to the west. The premium peaks of visible sea area distributed in Futian, Luohu and Yantian districts, and declined from those areas both eastwards and westwards. The premium peaks of reservoir visible level on the land price was mainly located in Futian, Luohu and Longgang districts, which also showed a decline trend on the direction of east-west. This study is expected to enrich the theory of factors that influence land price location and meanwhile offers a detailed instruction for quantitative analysis of landscape visibility.

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Spatialization of Demographic Data at Medium Scale Based on Remote Sensing Images: Regarding Beijing-Tianjin-Hebei as an Example
WU Jiansheng;XU Duo;XIE Wudan;PENG Jian
   2015, 51 (4): 707-717.   DOI: 10.13209/j.0479-8023.2015.100
Abstract （1752）      PDF（pc） （5407KB）（990）       Save
This study selects Beijing-Tianjin-Hebei region as the study area and attempts to realize the population spatialization with the data of DMSP/OLS, land use, socio-economic and ecological environmental factors related to population distribution at the medium scale. Firstly, the authors obtain the census data of Beijing-Tianjin-Hebei region in 2010, and then calculated the probability coefficient based on these factors (selected roads, railways, rivers, slope, land use and nighttime light), and finally assign the census data to each pixel using all related variables and their probability coefficients with the software of geographic information system (GIS). City census data was chosen to test the research result, and the results showed that the accuracy rate of the population spatialization in the Beijing-Tianjin-Hebei region is more than 74% in the urban scale. The method for population spatialization can be well applied to the spatialization of demographic data at medium scale.
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Urban Water Landscape Fragmentation and the Change of Ecological Values in Shenzhen
LIU Zhenhuan,WANG Yanglin,PENG Jian,LI You,WU Jiansheng
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract （1270）            Save
With the aid of theory of landscape ecology, analysis of traj ectories and assessment of ecosystem service, this paper takes the water body in Shenzhen as the research object, analyzing the dynamic process of water body fragment and the corresponding changes of the ecosystem service. The results show that: 1) the process of water body fragment is so clear that the shrink of water body is the main characteristic. During 2000 and 2006, rivers became segment and channelization, pond and wetland were shrinking. In addition, the processes of fragment are different between each kind of water body. 2) The endpoint of the trajectories of change of water is developed land, and the changing process from water to developed land impose the trend of fragmentation and shrinking. 3) Water fragmentation restricts the ecological service. The direct service value increases continuously, while the indirect service value decreases, which leads to the increase of the proportion of the direct service value.
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Ore Body Spatial Data Interpolation in 3D Visualization Environment
WU Jiansheng,WANG Yanglin,ZENG Xinping,HE Zhijun,CHEN Zhenghui
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract （1293）            Save
The spatial data interpolation in geosciences is mostly in two-dimensional space. With three-dimensional environment the three-dimensional spatial data interpolation is possible. Most of ore body grade was calculated by hand, but in 3D visualization environment it can be calculated quickly and precisely. This method includes three parts. The first is that the three surface model is built with visualization technology. The geology body is simulated correctly and its shape is easy to analyze. The second is that the body is disassembled using block model. The inner of ore can be modeled by block model. The third is that inverse distance and Kriging methods are used in spatial data interpolation. The result from example researching shows that the spatial data interpolation methods in 3D environment are reasonable. The tonnage and metal reserve can be calculated.
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Research on Landscape Ecology and Sustainable Land Use
PENG Jian,WANG Yanglin,LIU Song,WU Jiansheng,LI Weifeng
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract （316）            Save
Sustainable land use is always the research topic of land science and related disciplines. In this paper, we make research on sustainable land use under the guide of newly landscape ecology. It is a beneficial attempt to extend the research scope on sustainable land use. Based on the analysis of the relations hip between land, landscape and landscape ecology, we make a new annotation of the connotation of sustainable land use according to such landscape ecology theories as structure and function, ecological holism and spatial heterogeneity, hierarchy and scale, and landscape change and stability.
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Research on Landscape Ecology and Sustainable Land Use
PENG Jian,WANG Yanglin,LIU Song,WU Jiansheng,LI Weifeng
Acta Scientiarum Naturalium Universitatis Pekinensis   
Abstract （1451）            Save
Sustainable land use is always the research topic of land science and related disciplines. In this paper, we make research on sustainable land use under the guide of newly landscape ecology. It is a beneficial attempt to extend the research scope on sustainable land use. Based on the analysis of the relations hip between land, landscape and landscape ecology, we make a new annotation of the connotation of sustainable land use according to such landscape ecology theories as structure and function, ecological holism and spatial heterogeneity, hierarchy and scale, and landscape change and stability.
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