1. Introduction
Tourism is a multi-compound organic whole [
1]; scenic spots are the carrier of tourism supply and the cornerstone of tourism development, and they are the core components of the tourism industry. Among them, the high-level scenic spot is the key to the innovation and high-quality development of regional tourism and is also representative of the brand image of tourism spots [
2]. The spatial structure of regional scenic spots not only involves the distribution state of scenic spots and the combination of elements but also directly influences the spatial behavior of tourists and finally influences the realization of tourist benefits [
3,
4]. Pan et al. took A-class attractions as examples to analyze the spatial distribution characteristics of 2,424 A-class tourist attractions in China through methods of the nearest neighbor index, K index, and hot spot clustering based on GIS technologies. Grid cost weighted distance algorithm was applied to compute the spatial accessibility of China’s A-class tourist attractions and measure the overall accessibility of county units [
3]. The spatial distribution of scenic spots has a certain influence on tourists’ temporal–spatial behavior, regional tourism income, and the level of social development. Foreign scholars began to study the spatial structure of tourism early and mainly used the location theory, the central periphery theory, and the core edge model to explore the tourist market [
5], the spatial structure, and the evolution process of tourism destination [
6,
7]; nevertheless, there are few studies on the spatial structure of scenic spots. At present, there is a lot of research on the spatial pattern of scenic spots in China, mainly focusing on the spatial distribution characteristics of scenic spots [
8,
9], influencing factors [
10,
11], time–space evolution [
12], optimal path [
13], etc. Ma et al. combined multiplex spatial statistical methods, including standard deviation elliptic analysis, kernel density estimation, and global spatial autocorrelation, to measure the spatial distribution characteristics of Great Xiangxi high-class tourist attractions and applied the Global Regression (OLS) model and the Geographically Weighted Regression (GWR) model to analyze the spatial heterogeneity in the influential factors of Great Xiangxi high-class tourist attractions [
10]. The research areas are mainly national, regional and provincial [
14]. Guo et al. adopted the approach to combining big data and traditional geographical information systems with studying the overall spatial distribution pattern, the distribution orientations, and spatial distribution characteristics of specific cities using the POI (Point of Interest) data of Shanxi tourist attractions as the research object [
15]. Most of the research objects are all scenic spots, and some scholars have recently classified scenic spots. The main research methods are mathematical statistics and spatial analysis [
16]. Tang et al. employed the GIS spatial analysis method respectively to dissect the administrative distribution characteristics of Changsha A-class tourist attractions and unravel the distribution correlations among the five factors of Changsha, including DEM, NDVI, rivers, GDP, and transportation [
17].
Spatial accessibility refers to the ability to reach a designated place at an appropriate time and rely on traffic facilities, depending on the person’s mobility and the opportunity to achieve the goal by moving [
17,
18]. Since Hansen first proposed the concept of accessibility in 1959 [
19], the foreign scholars have carried out thorough research on the accessibility, and its research content mainly includes the social public service facilities node layout and the location [
20], the road net, and the different region accessibility relations as well as the influence factors and so on [
21]. The study area is relatively micro, mainly involving the accessibility of specific places (schools, parks, hospitals, etc.) [
22]. The main research methods are the moving search method, 2SFCA, gravitation method, gravity model, etc. [
23]. At present, the domestic scholars mostly concentrate on the public facilities [
24], green land of parks [
25], and the influential factors of accessibility [
26]. Yin et al. took 258 tourism-driven poverty alleviation key villages in the Wuling Mountain area, Hubei Province, as research samples, toward which grid cost weighted distance algorithm and the Geographically Weighted Regression (GWR) model were utilized for studies on the tourist transportation accessibility and the corresponding influence factors, as well as the influence extent spatially and the difference in influence directions [
27], the research areas are predominantly regional urban agglomeration [
27], scenic spots [
28] and railway lines [
29]. Yan et al. operated the ArcGIS spatial analysis method, accessibility model, and gravity model to investigate the impact of the launch of China’s “four vertical and four horizontal” high-speed trains on the accessibility of the cities along the railway and the economically related spatial structure [
30]. The research method is based on the network cost method [
30], network analysis [
31], and space syntax [
32]. Jia et al. optimized the model for accessibility computation with a layered grid cost method exampled by the Yangtze River Economic Belt. Indicators including weighted average travelling time, daily accessibility index and tourist utility function were applied to quantitatively measure and comprehensively analyze the “temporal-spatial compression” effect of high-speed trains on regional tourism [
31]. A correct understanding of the differences in the spatial distribution and accessibility of scenic spots is the basic work to realize the optimal allocation of tourist resources and the development of tourist industry [
33]. Zhu et al. comprehensively applied GIS spatial analysis method to establish overall assessment for the spatial structure and the accessibility for A-class tourist attractions of different categories in South Anhui International Cultural tourism demonstration Zone, and to investigate the patterns in spatial differentiation [
34]. In order to further broaden the research content of the spatial pattern of the existing scenic spots, this study combines the spatial pattern of the scenic spots with the accessible pattern in order to provide the theoretical support for the planning and layout of scenic spots.
This study systematically reveals the spatial distribution and accessibility of scenic spots, clarifies the characteristics of regional differentiation, and clarifies the internal relationship between the distribution and accessibility of scenic spots and the factors such as natural environment, resource endowment, transportation network, and economic level, which plays a key role in the development of tourism industry. However, there are relatively few studies on frontier ethnic areas such as Inner Mongolia, and the existing studies in Inner Mongolia mainly focus on resource evaluation [
35], image perception [
36], and the farmer’s livelihood [
37]. The research on the spatial distribution pattern and accessibility of scenic spots is relatively lacking. This study took the high-level scenic spots in Inner Mongolia as the research objects, which is an innovation in the study of the spatial distribution and accessibility of tourism, enriching the study of tourism system theory and expanding the research scope of tourism geography; which is especially a useful attempt in the study of spatial tourism structure. At the same time, this study broadened the research content of the existing spatial pattern of scenic areas; the study, combining the spatial distribution with the accessibility distribution pattern of scenic spots, can provide theoretical support for the planning layout of scenic spots. In addition, this study can also provide a scientific basis for the location, construction, and development of scenic spots, which will contribute to the planning direction of scenic spots and the renewal of urban space in the future; it can also provide a reference for the prediction and positioning of the visitor market of scenic spots. In a word, the measure and analysis of the spatial pattern and accessibility of the high-level scenic spots in Inner Mongolia are significant from three perspectives, including the macro level of governments, the medium level of enterprises, and the micro level of tourists, which has a key role in the sustainable development of these three perspectives.
Based on this study, the high-level scenic spots (3A and above) in Inner Mongolia were chosen as the research objects. First of all, this study adopted GIS spatial analysis to identify the proximity index and the kernel density of Inner Mongolia’s high-class tourist attractions, which reflected the distribution patterns of high-class tourist attractions. Subsequently, based on the distribution and the road network structure of high-class tourist attractions, GIS technologies were applied to discuss the accessibility spatial pattern of different-typed tourist attractions in Inner Mongolia. Thirdly, the accessibility factors of high-level scenic spots in Inner Mongolia were identified, and the paths for optimizing the accessibility of high-level scenic spots in Inner Mongolia were proposed in order to provide a reference for improving the accessibility of scenic spots in Inner Mongolia, promoting high-quality development facilitation and relevant policy making.
4. Conclusions and Discussion
4.1. Conclusions
This study used spatial analysis methods to scientifically identify the spatial structure of different types of tourist attractions in Inner Mongolia and measure their accessibility. On this basis, the spatial differentiation law of the overall accessibility of county units is studied. Additionally, ESDA spatial correlation analysis method was used to reveal the spatial correlation of the accessibility of different types of scenic spots in counties, and an in-depth analysis of the influencing factors of accessibility proposes an optimal path for accessibility. The result showed that this study combined the geographical spatial distribution characteristics and accessibility distribution characteristics of high-level scenic spots in Inner Mongolia to improve the accessibility of high-level scenic spots in Inner Mongolia from three aspects, including the stratified design of tourist attractions, the construction of tourist traffic and facilities, and the linkage design of tourist routes.
According to the distribution pattern of Inner Mongolia tourist attractions, the spatial distribution of tourist attractions of different categories in Inner Mongolia all exhibits a distribution state of “small-scaled aggregation and large-scaled dispersion” relative to fewer core attraction groups and variations in the aggregation degree of the spatial distribution of the attractions within the same category. In Inner Mongolia, natural attractions show the highest aggregation degree, while humanities attractions have the lowest. The capital city of Inner Mongolia, Hohhot, and the surrounding union cities have forged a relatively strong bond in attraction correlation and a good trend on synergetic and codependent development, whereas no high kernel density aggregation areas take shape in other union cities. Overall, tourist attractions of all categories aggregate to a relatively low extent, and the attraction distribution is scattered.
Based on the accessibility distribution of Inner Mongolia tourist attractions, spatial accessibility distribution patterns of all attractions, humanities attractions, and natural attractions in Inner Mongolia are in general accord, showing a relatively poor overall accessibility. Accessibility of natural attractions is better than that of humanities attractions. In the accessibility grade distribution of different types of attractions, the number of attractions for each time period basically remains the same, which is close to the distribution pattern of the transportation network. The accessibility spatial distribution of county units of all types of attractions in Inner Mongolia varies significantly, exhibiting an oblique distribution pattern of “low in the west, high in the east”, where accessibility of the northeast and southwest counties is relatively poor while relatively good accessibility is observed in the southeast counties in Inner Mongolia with an inverted U-shaped distribution over time. A strong positive spatial correlation exists in the accessibility of county units of all types of attractions in Inner Mongolia, showing a highly aggregated state in the spatial distribution of high values and low values of county accessibilities.
The accessibility of high-level scenic spots in Inner Mongolia varies spatially, and its influencing factors can be examined mainly from the following four aspects, namely, resource endowment, transportation network, natural environment, and economic level. Resource endowment and transportation network are the direct factors of regional tourist attractions accessibility, while the natural environment and the economic level are the indirect factors of tourist attractions accessibility, which mainly influence tourist attractions accessibility by acting on the first two factors. Resource endowment is the key element of tourism development, and the balanced degree and the number of tourist attractions are the key factors affecting accessibility. The number and balance of tourist attractions are positively correlated with their accessibility. The more tourist attractions are distributed, the more balanced the distribution of tourist attractions is, and the better their accessibility is. Transportation is an important fulcrum connecting the source and destination, and the density of developed transportation networks greatly reduces the spatial barriers to travel. The distribution level and density of the transportation network have an important influence on the accessibility of scenic spots. Generally, the more mature the development of the road network and the better the system, the better the accessibility of the spots. The level of socio-economic development is not only the dependent condition for the function of tourism but also the development basis for the scale of the tourism market and market potential of the source place. The more developed the economy of the region, its residents’ tourism demand is stronger, and the more money invested in improving roads and other infrastructure construction is bound to improve the accessibility of attractions. The distribution of tourist attractions is to some extent limited by the natural environment, different topography, rivers, etc., which will affect the layout and development of tourist attractions. Natural scenic spots are mostly distributed around mountains and rivers, and humanistic scenic spots are mostly distributed in flat terrain areas.
4.2. Implications
The measurement of the spatial pattern and accessibility of high-level scenic spots in Inner Mongolia in this study is closely related to the sustainable development of tourism. First, it can provide a reasonable reference for the government to optimize the layout of high-level tourist attractions in Inner Mongolia, improve the road network near high-level tourist attractions, formulate tourism development plans and publicity and marketing plans, and improve social transportation accessibility in a targeted manner. Secondly, it is beneficial for tourism enterprises to make reasonable site selection before investing and select suitable and profitable sites for investment and operation according to the distribution density and accessibility of scenic spots. In addition, in the process of daily travel consumption, residents can reasonably arrange the time, method, and route of travel, make travel preparations before travel, and efficiently realize their own travel purposes.
In terms of theoretical implications, most of the existing research cases are concentrated at the city or national level. This study takes the high-level scenic spots in Inner Mongolia as the research object. It is an innovation in the research on the spatial distribution characteristics and accessibility of tourism and enriches the tourism system theory. The research has expanded the research scope of tourism geography, especially a useful attempt in the research of spatial tourism structures. This study broadens the research content of the existing spatial pattern of scenic spots, and the research that combines the spatial distribution of scenic spots with the distribution pattern of accessibility can provide theoretical support for the planning and layout of scenic spots.
With respect to managerial implications, the exploration of the spatial distribution characteristics of scenic spots is conducive to breaking the shackles of the original spontaneous organization and provides strong support and a scientific basis for the rational and orderly construction of scenic spaces. This study provides a scientific basis for the location, construction, and development of scenic spots, which is helpful for the planning direction, resource allocation, and management guarantee of scenic spots in the future, as well as the shaping and renewal of urban space. It can also provide services for tourists to design high-quality circular tourism routes and provide a reference for the market forecast and positioning of existing scenic spots.
This study combined the geospatial distribution characteristics and accessibility distribution characteristics of high-level scenic spots in Inner Mongolia to enhance the accessibility of high-level scenic spots in Inner Mongolia from the following three aspects. The first one is the circle design of tourist attractions. Combining the spatial pattern of accessibility of high-level scenic spots in Inner Mongolia with the spatial distribution of circles and the different spatial distribution of natural and human attractions in different geomorphological zones, the development and construction of scenic tourism spots will be targeted according to the types of scenic resources in the circles. The second one is tourism transportation and facilities construction. It should not only optimize the external railroad, highway, and air traffic and take the initiative to integrate into the regional transportation system but also open up the internal traffic and pay attention to the construction of scenic tourism roads in Inner Mongolia. The third one is tourism line linkage design. According to the spatial layout of Inner Mongolia tourism, traffic pattern, planning convergence, and other factors, through product mix, traffic combination, etc., to adapt to the different needs of group tourists and casual tourists, comprehensive consideration of the travel needs of each market segment, integrated consideration to create a diverse tourism experience, the formation of multiple boutique theme tourism routes.
5. Future Research Directions
This study explored the spatial pattern and accessibility of various scenic spots in Inner Mongolia in depth, which has reference significance for future research on resource integration and accessibility in Inner Mongolia and other regions, but there are still some shortcomings in this study that need to be improved. First, regarding the calculation of accessibility values, there are various methods for measuring accessibility, including the cost method [
31], network analysis [
32], and spatial sentence method [
33] based on road networks, and this study used the shortest cost-weighted distance to measure accessibility values. However, accessibility is not only influenced by time and traffic but also by attractiveness, comfort, and cost, so it should focus on judging the accessibility of scenic spots from multiple perspectives and methods to improve the scientific and precise accessibility measurement in future research. Secondly, the analysis of existing studies on spatial patterns includes both ephemeral data analysis [
35] and cross-sectional data analysis of a single year [
41], and this study selected data of a single year in Inner Mongolia for spatial and temporal pattern analysis. However, the spatial pattern of accessibility of tourist attractions is a process of continuous dynamic change, and it would be more scientific and reasonable to explore its evolution pattern by conducting comparative analysis and research on the spatial pattern of accessibility of tourist attractions at multiple time points in a region. Therefore, the quantitative research method of multiple time nodes will be the next research direction for the accessibility research of scenic tourism spots. In addition, the existing studies focus on exploring the spatial pattern of tourism scenic area distribution, accessibility measurement [
3,
15], and influencing factors [
8,
10], while this study not only analyzed the spatial layout and influencing factors of accessibility of scenic tourist areas in Inner Mongolia, but also put forward some countermeasure suggestions for spatial structure optimization in a relatively shallow way. Therefore, it should analyze in depth the reasons for the unreasonable spatial structure of tourist scenic spots, and at the same time, it should specifically offer reasonable suggestions for the optimization of the spatial structure of scenic spots in order to provide a reference for the improvement of accessibility of other similar areas in the future research.