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In recent years, under the influence of multiple factors such as traditional ideas and living economic conditions, the aging population in China continues to increase. Most of the elderly are more inclined to aged at home, and the first places for elderly activities are communities and the surrounding environment, which greatly affects the convenience of life and happiness of the elderly. In this paper, Changxindian area in Fengtai District of Beijing was as the research object, and detailed calculation and analysis were carried out by using POI data and arcGIS software. The relative location of residential areas and surrounding public toilets was explored, and the best location of public toilets in the daily walking area under the model of community home-based care for the elderly was further studied. [ABSTRACT FROM AUTHOR]

[ Objective] The paper uses Geographic Information System (ArcGIS) as a platform to discuss the study of DEM data on the digital construction of rural landscape databases and the coupling relationship in geographic space of rural landscape. The aim is to further expand the coverage of China's land space digitization and provide practical theoretical basis and development possibility of quantitative planning for village level administrative zoning research. [Method] In this paper, Xiangyu Village, Junzhuang Town, Mentougou, West Beijing, is selected as the research object, and the document space database of the study area is constructed by building digital elevation model (DEM), ArcGIS stacked map weighting and visual interpretation methods. Moreover, its elevation equivalence, slope direction, and water flow direction are visually analyzed. [Result] The mountainous terrain and hydrological characteristics of Xiangyu Village are roughly consistent with the village layout; the living environment of Xiangyu Village is consistent with the terrain and texture, and it belongs to the rural landscape system of mountains, valleys and small watersheds. [ Conclusion] The results obtained through data visualization analysis are basically consistent with the traditional village planning pattern of Xiangyu Village; the rural landscape based on village level administrative divisions is still in the traditional planning stage, and there is great development space for village level geographic spatial survey. Therefore, it is necessary for relevant practitioners to make more contributions to fill the full coverage of China's land space digitization. [ABSTRACT FROM AUTHOR]

With the increasing number of western peregrinators to China, the number of travellers to Beijing and the Great Wall continued to increase, forming the north China peregrination route. This paper analyzed the concrete impression of western peregrinators on Beijing and the Great Wall, and held that the structural characteristics of western peregrinators were caused by the change of trade requirements. [ABSTRACT FROM AUTHOR]

Based on the data of residential buildings and office buildings in the built-up area of Beijing, using quantitative analysis tools such as correlation analysis, ArcGIS kernel density analysis and cluster analysis, this paper discussed the spatial agglomeration characteristics of office areas and residential areas around the rail transit station from the two levels of micro structure and macro distribution. The results showed that: (1) The spatial agglomeration of offices and residences around the rail transit station had an obvious concentric ring structure, and such concentric ring structure was most obvious in the transfer area of rail transit from 5 km to 10 km from the city center. (2) Both the residential space and office space presented distinct spatial differences and multi-center agglomeration characteristics. The office space was mainly distributed between the East Third Ring Road and West Third Ring Road as well as the South Second Ring Road to the North Fifth Ring Road, and agglomerated in the China World Tower, the Beijing Financial Street and Zhongguancun, while the residential space was spread from the center of the city to the surrounding area. (3) From the perspective of jobs-housing balance, the areas of jobs-housing balance were mainly distributed within the fourth ring of northern Beijing, while the peripheral areas and southern Beijing were mainly residential functions, and the impact of Beijing rail transit on urban spatial structure was still in its infancy. [ABSTRACT FROM AUTHOR]

In this paper, the spatial, temporal distribution, transformation and source simulation of NO3- were analyzed systematically based on the monitoring data, literature review and numerical simulation (CMAQ4.7.1). Analysis results showed that annual average concentration of NO3- in Beijing was between 6.69 and 12.48 Mg/m3 with an increasing trend in recent years; concentration of NO3- in Beijing in 2013 was higher in winter and autumn than that in spring and summer and diurnal variation of NO3- showed bimodal distribution and spatial distribution of NO3- showed significant north-south gradient distribution; annual average N0R in Beijing was between 0.12 and 0.17 while it was between 0.17 and 0.20 during heavy air pollution days in 2013; the average ratio of NO3-/S02- was between 0.97 and 1. 06 while it was between 1. 00 and 1. 07 during heavy air pollution days in 2013; the emission sources of Beijing was being changed from fixed source to both fixed and moving sources in feature development; simulated local, external transportation, background and boundary condition were 40%, 44% and 16% respectively to the annual average concentration of NO3- in Beijing in 2013 while they were 31%, 57% and 12% respectively in heavy air pollution days, which indicated that external source played an important role to the concentration of NO3- in Beijing. [ABSTRACT FROM AUTHOR]

In this paper, atmospheric environmental background, weather conditions and formation mechanism of one typical air pollution episode in Beijing during October 6th -12th, 2014 were investigated by combining observed data with numerical model CAMx. Results showed that the occurrence of heavy air pollution resulted mainly from stable atmospheric conditions regionally or locally. Observed heavy pollution episodes were characterized by a stagnant atmospheric structure with average wind speed of 1.56 m/s, high humidity of 83.13%, large inversion strength of 3.42 cC/100 m which were disadvantageous to the dispersal of air pollutants. The air pollution episode during October 8th -11th was the most serious with daily average PM25 concentration of 264 μ/m³ in Beijing, and heavily polluted land area at Beijing, Tianjin and Hebei districts was about 2 × 105 km². Model research showed that regional transmission contributions to the receptor sites in Beijing were between 61% -69% during 8th -11th, and regional transportation played a more important role in this serious air pollution episode. [ABSTRACT FROM AUTHOR]