Evaluating the Attraction of Scenic Spots Based on Tourism Trajectory Entropy

With the development of positioning technology and the widespread application of mobile positioning terminal devices, the acquisition of trajectory data has become increasingly convenient. Furthermore, mining information related to scenic spots and tourists from trajectory data has also become increasingly convenient. This study used the normalization results of information entropy to evaluate the attraction of scenic spots and the experience index of tourists. Tourists and scenic spots were chosen as the probability variables to calculate information entropy, and the probability values of each variable were calculated according to certain methods. There is a certain competitive relationship between scenic spots of the same type. When the distance between various scenic spots is relatively close (less than 8 km), a strong cooperative relationship can be established. Scenic spots with various levels of attraction can generally be classified as follows: cultural heritage, natural landscape, and leisure and entertainment. Scenic spots with higher attraction are usually those with a higher A-level and convenient transportation. A considerable number of tourists do not choose to visit crowded scenic destinations but choose some spots that they are more interested in according to personal preferences and based on access to free travel.


Introduction
The attraction of a scenic spot can be defined as the degree to which it meets tourist expectations in terms of entertainment opportunities, food and accommodation, cultural richness, natural beauty, and other convenient facilities [1].The concept of "tourism attraction" proposed by Formica, S. is a good tool for exploring supply-demand relationships [2].The attraction of a destination is defined as "an individual's perceived ability be provided by a destination that meets their special vacation needs" [3].
Although destination attraction has become one of the most popular topics in tourism research [4], the composition of destination attraction is complex, and its basic logic has not been fully explained [5].The attraction of tourist destinations is the driving force for tourists to perceive value [6].The most important matter is that the attraction of a destination encourages the public to visit and spend time there, which is foundational for encouraging tourist loyalty.Destination attraction also plays a crucial role in determining destination competitiveness [7].
Several researchers have attempted to determine the attraction of a destination and the factors that influence tourist decision-making processes in order to assess whether a region is an ideal vacation destination.The attractiveness of a region not only depends on its corresponding place and the characteristics of the local population but also on the cognitive image of the destination perceived by tourists [8].Most researchers evaluate The attraction of tourism has been modeled in different contexts, but few have attempted to examine the overall attraction of a city from the perspective of tourists.The factors that attracted tourists the most were investigated with the aim of illustrating the attraction of urban tourism [9].The relationships between destination attraction, satisfaction, the sense of reliving, and loyalty were explored among American tourists who experienced Silk Road tourism in Uzbekistan [10].The determinants of the attraction of hot spring tourism destinations were explored in Taiwan from a demand-side perspective [11].Themes, products, and designs were identified as the three most important attributes that contribute to enhancing the attraction of salt industry destinations and influencing the decision-making processes of tourists.The combination of theme and design was considered the most prominent feature of the attraction of salt heritage sites [12].The effects of cognitive and affective images were examined in relation to destination attraction [13].A study attempted to identify the determining factors of tourist destination attraction based on tourist expectations, experiences, and satisfaction with tourism-related attributes [14].
Entropy 2024, 26, 607 3 of 18 Some researchers have studied the attraction of industrial tourism, especially in relation to factory tourism [15].Finally, exploratory factor analysis was conducted to determine the most important factors involved in the attractiveness of tourist destinations, which were outlined as follows: tourism infrastructure, historical and cultural attractors, natural attractors, and communication facilities and lifestyle [16].The uniqueness of forest landscapes and unique climate phenomena are the two most important factors determining the attractiveness of forest leisure tourism [17].Paying attention to their independence is the main indicator determining tourism attractiveness [18].
A unique model designed to capture the antecedents of local attractiveness was developed in the context of crowded tourism hotspots [19].The relative attractiveness of competing tourist destinations and the views of individual tourists have been evaluated in relation to vacation destinations [20].Every improvement and development of attraction variables, such as the location and facilities provided by scenic spots, will have an increasing impact on the intentions of tourists to revisit a destination [21].The winners in the tourism industry will be those countries with attractive tourist destinations that attract large numbers of tourists [22].

The Application of GPS in Tourism
In recent years, the use of GPS trajectory data in tourist scenic spots has received significant attention.Researchers have explored various aspects of their application, including understanding tourist behavior, optimizing travel routes, and enhancing overall tourist experiences.Tourism mobility has attracted widespread attention from tourism scholars.In recent years, advances in information technology have enabled tourism researchers to obtain detailed information about the digital footprint of tourism.GPS devices are used to track different groups of tourists around scenic spots to determine where they have gone and how long they have visited specific locations.Tracking data have been combined with survey data to explore whether different types of tourists behave differently when visiting scenic spots.Most tourists follow similar routes and exhibit strong "main path inertia" [23,24].
Passive mobile GPS positioning records were used to study the travel behaviors of tourists, particularly the number of trips, time spent at each destination, and mode of transportation [25,26].Bicycle trajectory data were used to analyze the spatio-temporal behavior of Chinese bicycle tourists in the Xizang Autonomous Region [27].Global positioning system technology has been used to compare and contrast the behavioral patterns of first-time and repeat visitors to Hong Kong [28].A data management platform was presented to handle heterogeneous data, including taxi data, social media data, and venue data, to analyze the behavior of tourists.This can provide insights into tourism trajectories, activities for governments, and businesses relevant to the tourism industry and will help predict future tourism trends [29].

Network Analysis in Tourism
Network analysis has been used in many different disciplines of social sciences and fields, including organizational sociology, political science, and organization theory [41,42].The use of network analysis in tourism may be more important than in other fields because a network refers to sets of elements and the ties and relations among them, which is relevant to the study of tourism.
In recent years, the tourism literature has witnessed an increasing amount of research focused on network analysis.Tourism research has studied supply, destinations, and policy systems through the use of network analysis, as well as analyzed the movements of tourists and their behavior patterns [43][44][45][46].Network analysis between scenic spots can be further expanded to collaborative cooperation between scenic spots, collaborative marketing between scenic spots, and the sustainable development of the tourism industry [47,48].

The Application of Information Entropy
The concept of entropy originates from thermodynamics and is a function that describes the ability of an energetic system to work.It also has philosophical connotations and can be used to evaluate the status of other disciplinary systems.The connotation of entropy has been extended and applied in disciplines such as information theory and the life sciences.Shannon first introduced the concept of entropy to information theory in 1948 with the definition of information entropy.The information entropy proposed by Shannon has the advantage of being able to characterize the disorder of a system based on the uncertainty of the information source using probability measures and mathematical statistics.The emergence of information entropy marked the generalization of entropy.Subsequently, concepts such as social entropy, economic entropy, and ecological entropy also emerged.
In the case of researching cities, the use of information entropy is mainly reflected in the following applications: analyzing the spatio-temporal distribution of water resources in search of sustainable urban water resource management [49]; scenario analysis of environmental impacts in energy strategies to achieve reasonable urban energy planning [50]; landscape pattern change analysis to examine the relationships between landscape planning and chaotic entropy change [51]; and studying the evolution of urban household energy consumption structures [52].Land use information entropy was used to analyze the dynamic changes and degree of transformation of various land use types within a certain period of time [53].However, few studies have applied information entropy to research to tourism behavior.Based on previous research, this article applied information entropy to study the attraction of scenic spots, and the results of the final analysis can be used to assist tourists in making decisions.

Methodology
In this study, information entropy and linear normalization were used to evaluate the attraction of scenic spots, and the experience index of tourists was obtained through the use of GPS trajectories.

Study Area and Data
Sanya City is the second largest city in Hainan Province.It is located at the southernmost point of Hainan Island, covering a geographic extent from 18 • 09 ′ 34 ′′ to 18 • 37 ′ 27 ′′ N and from 108 • 56 ′ 30 ′′ to 109 • 48 ′ 28 ′′ E (as shown in Figure 1).The city is 91.6 km long from east to west and 51.8 km wide from north to south.Sanya City has a total land area of 1921 square kilometers and a total sea area of 3226 km 2 .
The existing trajectory data for this study were provided by Six Legs (http://www.foooooot.com/accounts/login/,accessed on 10 July 2023), which is an outdoor travel software platform developed by Beijing Genghi Technology Co., Ltd.(Beijing, China).It provides users with powerful GPS trajectory recording capabilities, enables the convenient sharing of travel, allows diverse offline map downloads, and can be used to browse millions of outdoor travel routes at any time.The personal trajectory section was collected by the author during her research trip to Sanya using the Six Legs app (as shown in Figure 2).The existing trajectory data for this study were provided by Six Legs (http://www.foooooot.com/accounts/login/,accessed on 2023.07.10), which is an outdoor travel software platform developed by Beijing Genghi Technology Co., Ltd.(Beijing, China).It provides users with powerful GPS trajectory recording capabilities, enables the convenient sharing of travel, allows diverse offline map downloads, and can be used to browse millions of outdoor travel routes at any time.The personal trajectory section was collected by the author during her research trip to Sanya using the Six Legs app (as shown in Figure 2).

Conceptual Framework
Buffer radius of each scenic spot (Rj): The buffer radius of each scenic spot was calculated based on its area Si, and then the buffer of each scenic spot was established to conform to its corresponding buffer radius.The specific buffer is shown in Figure 3.Because the area of each scenic spot is different, the buffer radii are also different.

Conceptual Framework
Buffer radius of each scenic spot (Rj): The buffer radius of each scenic spot was calculated based on its area Si, and then the buffer of each scenic spot was established to conform to its corresponding buffer radius.The specific buffer is shown in Figure 3.Because the area of each scenic spot is different, the buffer radii are also different.

Conceptual Framework
Buffer radius of each scenic spot (R j ): The buffer radius of each scenic spot was calculated based on its area S i , and then the buffer of each scenic spot was established to conform to its corresponding buffer radius.The specific buffer is shown in Figure 3.Because the area of each scenic spot is different, the buffer radii are also different.
The scenic spots visited by trajectory (Tr i S j ): Calculate whether each trajectory Tr i (i = 1, 2,. ... .., 1553) intersects with the buffer of each scenic spot S j (j = 1, 2,. ... .., 17).If it intersects, it is considered that trajectory Tr i has visited the scenic spot S j and Tr i S j = 1; otherwise, Tr i S j = 0.A trajectory can visit 0 or more scenic spots.Calculate the number of scenic spots visited by each trajectory and the specific scenic spots visited.
The number of visiting trajectories for each scenic spot (N Tr S j ): Generate buffers (as shown in Figure 3) using the area of each scenic spot, and then perform spatial overlay analysis on all trajectories and the buffers.The number of trajectories N Tr S j that intersect with the buffer of each scenic spot is the number of visiting trajectories for that scenic spot S j .The number of visiting trajectories for each scenic spot (NTrSj): Generate buffers (as shown in Figure 3) using the area of each scenic spot, and then perform spatial overlay analysis on all trajectories and the buffers.The number of trajectories NTrSj that intersect with the buffer of each scenic spot is the number of visiting trajectories for that scenic spot Sj.
The number of scenic spots for each trajectory (NSTri): Perform spatial overlay analysis on all trajectories and the buffers.NSTri is the number of scenic spots visited by trajectory Tri, and the calculation formula is shown below, and the final result of this value ranges from 0 to 7; for the convenience of its subsequent representation, this value is represented by Sm (m = 0, 1, 2, ..., 7).
Number of trajectories corresponding to the number of scenic spots visited by a trajectory (NTrSm): After calculating the number of scenic spots Sm visited by each trajectory, the number of trajectories NTrSm corresponding to the number of scenic spots Sm visited by a trajectory is calculated.Let NTrSm be the variable with an initial value of 0; the calculation formula is shown below, and the specific distribution is shown in Table 1.The number of scenic spots for each trajectory (NSTr i ): Perform spatial overlay analysis on all trajectories and the buffers.NSTr i is the number of scenic spots visited by trajectory Tr i , and the calculation formula is shown below, and the final result of this value ranges from 0 to 7; for the convenience of its subsequent representation, this value is represented by Sm (m = 0, 1, 2, . .., 7).
Number of trajectories corresponding to the number of scenic spots visited by a trajectory (N Tr Sm): After calculating the number of scenic spots Sm visited by each trajectory, the number of trajectories N Tr Sm corresponding to the number of scenic spots Sm visited by a trajectory is calculated.Let N Tr Sm be the variable with an initial value of 0; the calculation formula is shown below, and the specific distribution is shown in Table 1.In this study, of a total of 1553 trajectories, nearly half (a total of 775) did not visit any of the scenic spots listed.These trajectories are considered non-sightseeing visits.The remaining 778 trajectories visited at least one scenic spot.From the distribution table shown above, it can be seen that most trajectories (totaling 620) only visited one scenic spot.As the number of scenic spots increases, the corresponding number of trajectories gradually decreases.Only one trajectory visited 6 scenic spots, and one trajectory visited 7 scenic spots; however, it is worth noting that the two trajectories may represent continuous records across multiple days.
The total visiting number of all scenic spots (ToS): Multiply the number of scenic spots (Sm) by the corresponding number of trajectories (N Tr Sm), add them up, and finally calculate the total visiting number of all scenic spots (ToS).The calculation formula is shown below, and the result is 1025.
The average visiting number of each scenic spot (N A ): By dividing the total number of visits to all scenic spots (ToS) by the number of scenic spots 17, the average visiting number of each scenic spot (N A ) can be calculated using the formula presented below, and the result is approximately 60.
The average visiting rate of each scenic spot (R A ): The average visiting rate of each scenic spot is calculated by dividing the average visiting number of each scenic spot (N A ) by the total number of trajectories (1553).The calculation formula is shown below; the result is approximately 3.86%.If the visiting rate of a scenic spot is higher than 3.86%, it is considered to have a relatively high visitation rate.
In this study, there were a total of 7 scenic spots with a relatively high visiting rate.The visiting rates of 7 scenic spots were ranked from high to low: the Coconut Dream Corridor (13%), the Yalong Bay Tropical Paradise Forest Park (9%), the Tianya Haijiao Tourist Area (6%), the Dadonghai Tourist Area (6%), the Nanshan Cultural Tourism Zone (6%), the Luhuitou Peak Park (5%), and the Daxiao Dongtian Tourist Area (4%).
Number of tourists visiting each scenic spot (N To S j ): Calculate the number of trajectories and the corresponding trajectories for visitations to each scenic spot and analyze the tourist code of the trajectories (ToCTr i ).If the trajectory belongs to various tourists, accumulate the quantity; otherwise, do not count it.Use the summary function of Excel to count the number of different tourists visiting the same scenic spot.

Information Entropy
For an uncertain system, if the state characteristics are represented by a random variable X, for a discrete random variable, set the value of X to X = {x 1 , x 2 , . . .x n }(n ≥ 2), and the probability corresponding to each value is then the information entropy of the system is shown below: Generally speaking, there is just one category that dominates the system.Assuming that this state is an extreme state, the minimum value of information entropy occurs as follows: S min = 0; on the contrary, if the number of various categories in the system is equal, then However, in practice, both of these situations are basically non-existent.Generally, the size of information entropy is situated between them, and its size directly reflects the complexity of the system.

Linear Normalization
Min-max normalization, for example, can be used to transform a value x of a numeric attribute A to x ′ in the range [0,1] by computing where min A and max A are the minimum and maximum values of attribute A.

The Identification of Local Tourists (Lo-Tour) and Visiting Tourists (NLo-Tour)
Whether a tourist is a local tourist or a visiting tourist can be determined based on the following factors: the degree of concentration (most trajectories overlap) and dispersion (trajectories are scattered without overlapping) of their trajectories, the number of scenic spots visited, and the distribution of trajectory times.In this study, individuals whose trajectory time span is less than or equal to 15 days are considered visiting tourists, while those whose time span exceeds 15 days are considered local tourists.If the number of visiting scenic spots is 0, it is considered a trip to a non-scenic spot; if it is greater than 0 but less than 5, it is considered to be a trip with a few scenic spots; if it is greater than or equal to 5, it is considered to be a trip with multiple scenic spots.In this study, the average number of trajectories per tourist is 2.6.In this study, only tourists with three or more personal trajectories were analyzed, mainly focusing on the following aspects: analysis of tourist attractions, trajectory distribution, and trajectory generation time.
Finally, local tourists and visiting tourists are divided into the following categories: non-scenic spot concentration, few scenic spots concentration, and multiple scenic spots concentration, as well as non-scenic spot dispersion, few scenic spots dispersion, and multiple scenic spots dispersion.In this study, 125 tourists were satisfied in that the number of personal trajectories was greater than or equal to 3. The final classification results are shown in Table 2 below.The following conclusions can be drawn from Table 2: (1) Among the 125 tourists, 67 were local tourists, and 58 were visiting tourists, with local tourists slightly exceeding visiting tourists.(2) For tourists that visit zero scenic spots, the trajectory distribution of local and visiting tourists is often more concentrated, which means that most local tourists choose to relax during their rest time and travel around their homes.However, visiting tourists choose to relax and explore the surrounding areas near the hotel.(3) For tourists that visit a few scenic spots, the trajectories of local tourists are often scattered, while the trajectories of visiting tourists are often concentrated.Considering the familiarity that local tourists have with the area, the visiting range will be larger; on the other hand, visiting tourists will choose hotels with many scenic spots to stay in, and then choose places near these hotels for leisure tourism, leading to a relatively concentrated trajectory distribution.(4) For tourists that visit many scenic spots, whether local or visiting, there is a relatively scattered trajectory distribution, which is directly related to the number of scenic spots and conforms to a major characteristic of multiple scenic spots.(5) The concentration and dispersion distribution differences between local tourist trajectories are relatively small.However, for visiting tourists, what is more obvious is that the trajectory of most tourists is concentrated.(6) In terms of the number of scenic spots visited, local and visiting tourists have the highest proportion of visiting only a few scenic spots, about 60%; followed by nonscenic spot, accounting for more than 20%; and multiple scenic spots, accounting for less than 20%.This indicates that over 20% of tourists choose non-scenic leisure tours.
In this study, the scenic spots visited by local tourists or visiting tourists were summarized; they are shown in Table 3.The following conclusions were drawn from the table : (1) For local tourists, the Dadonghai Tourist Area, the Coconut Dream Corridor, the Luhuitou Peak Park, and the Yalong Bay Tropical Paradise Forest Park are the most popular scenic spots; Yazhou Ancient City is more likely to be repeatedly visited.(2) For visiting tourists, the Nanshan Cultural Tourism Zone, the Tianya Haijiao Tourist Area, the Yalong Bay Tropical Paradise Forest Park, the Luhuitou Peak Park, and the Dadonghai Tourist Area are the most popular scenic spots; the Coconut Dream Corridor is more likely to be repeatedly visited.(3) From the analysis results, it can be seen that local tourists have lower enthusiasm for the Nanshan Cultural Tourism Zone and Tianya Haijiao Tourism Area compared to visiting tourists.(4) Yazhou Ancient City is a scenic spot that is frequently visited by local tourists but rarely visited by visiting tourists.It is speculated that this is because the scenic spot is not well known to the public.From Figure 4, it can be seen that the average number of visits by local tourists to various scenic spots is generally higher, while the average number of visits by visiting tourists is generally smaller, close to once.This distribution is in line with the characteristics of local and visiting tourists.Most visiting tourists only visit the scenic spots once and rarely repeat their visits to the same place.
From Figure 4, it can be seen that the average number of visits by local tourists to various scenic spots is generally higher, while the average number of visits by visiting tourists is generally smaller, close to once.This distribution is in line with the characteristics of local and visiting tourists.Most visiting tourists only visit the scenic spots once and rarely repeat their visits to the same place.

Attraction Index of Scenic Spots
The results of the kernel density analysis can only indicate that a certain scenic spot has a relatively large number of trajectories, and it does not indicate that the scenic spot has high attraction and is definitely worth recommending to tourists.This is due to the fact that there is a situation where certain scenic areas are located near a tourist's residence, and the trajectories of their frequent walks are recorded, resulting in a higher density value in the core of the scenic area.

Regression Model
Generally speaking, the more visits and tourists a scenic spot attracts, the more popular it becomes.The Figure 5. shows the number of visitation trajectories, the number of trajectories visiting unique scenic spots, and the number of visiting tourists for the 17 scenic spots.There is a strong correlation between them, with peaks occurring in the same scenic spot.Average number of visits per Lo-tour Average number of visits per NLo-tour

Attraction Index of Scenic Spots
The results of the kernel density analysis can only indicate that a certain scenic spot has a relatively large number of trajectories, and it does not indicate that the scenic spot has high attraction and is definitely worth recommending to tourists.This is due to the fact that there is a situation where certain scenic areas are located near a tourist's residence, and the trajectories of their frequent walks are recorded, resulting in a higher density value in the core of the scenic area.

Regression Model
Generally speaking, the more visits and tourists a scenic spot attracts, the more popular it becomes.The Figure 5. shows the number of visitation trajectories, the number of trajectories visiting unique scenic spots, and the number of visiting tourists for the 17 scenic spots.There is a strong correlation between them, with peaks occurring in the same scenic spot.In this study, an attraction regression model was created for each scenic spot using SPSS, as shown in Formula (10), where the dependent variable Y is the attraction of each scenic spot, and the other independent variables are the number of visiting trajectories (X1), the number of unique visited trajectories (X2), and the number of visiting tourists (X3) for each scenic spot.In this study, an attraction regression model was created for each scenic spot using SPSS, as shown in Formula (10), where the dependent variable Y is the attraction of each scenic spot, and the other independent variables are the number of visiting trajectories (X 1 ), the number of unique visited trajectories (X 2 ), and the number of visiting tourists (X 3 ) for each scenic spot.

Tourism Entropy
In this study, the information entropy of each scenic spot was calculated using tourists visiting the same scenic spot as the characteristic variable.The probability of each tourist is equal to the number of times they visited the scenic spot divided by the total number of visits to the scenic spot.The entropy formula is used to calculate the entropy value of each scenic spot, and finally, linear normalization can be performed on the entropy value to distribute it between 0 and 1.The formula is shown below (11); S(A) is the tourism entropy of scenic spot A. For example, suppose there are five tourists visiting scenic spot A, with each tourist visiting the scenic spot two, one, three, one, and one times, respectively; the total number of visits to scenic spot A is eight, and the probabilities of five tourists appearing at the scenic spot ) are P = {2/8, 1/8, 3/8, 1/8, 1/8}, respectively, with a total probability of 1.By substituting the probability values of the five tourists into the information entropy formula, the information entropy value of scenic spot A can be calculated as follows:

Comparative Analysis of Tourism Entropy and Regression Models
The results the regression model and the tourism entropy were normalized linearly.The normalized results of each scenic spot are shown in Figure 6.From the graph, it can be seen that the distribution trends are basically the same, except for the abnormal location of the Coconut Dream Corridor.Here, there are too many repeated trajectories visiting the Coconut Dream Corridor by one tourist; therefore, the results calculated using the regression model exaggerate the attraction of this scenic spot, while the results produced via tourism entropy are more reasonable.The regression model may exaggerate the attraction index of a certain scenic spot when the same tourist undertakes repeated trajectories; however, this situation is not observed when using the tourism entropy value.From the comparison of the attraction index values of different scenic spots obtained via two calculation methods, it can be seen that the comparison of the attraction values of different scenic spots calculated using tourism entropy is more reasonable.Therefore, the normalized result of tourism entropy is used as an indicator of the attractiveness of scenic spots.
the attraction index of a certain scenic spot when the same tourist undertakes repeated trajectories; however, this situation is not observed when using the tourism entropy value.From the comparison of the attraction index values of different scenic spots obtained via two calculation methods, it can be seen that the comparison of the attraction values of different scenic spots calculated using tourism entropy is more reasonable.Therefore, the normalized result of tourism entropy is used as an indicator of the attractiveness of scenic spots.

Attraction Index Rating of Scenic Spots
Scenic spots are classified into four levels based on the attraction index; the intervals are as follows: level four (0-0.25),level three (0.25-0.5), level two (0.5-0.75), level one (0.75-1).The first and second levels each have three scenic spots, while the third and fourth levels have six and five scenic spots, respectively.
Each scenic spot is defined as natural, cultural heritage, or leisure and entertainment

Attraction Index Rating of Scenic Spots
Scenic spots are classified into four levels based on the attraction index; the intervals are as follows: level four (0-0.25),level three (0.25-0.5), level two (0.5-0.75), level one (0.75-1).The first and second levels each have three scenic spots, while the third and fourth levels have six and five scenic spots, respectively.
Each scenic spot is defined as natural, cultural heritage, or leisure and entertainment type based on its characteristics.The ticket prices and A-level ratings were collected for each scenic spot, as well as the final attraction rating of the scenic spots, as shown in Table 4.The A-level ratings of each scenic spot have a corresponding evaluation standard, and the tourism A-level was obtained from the official tourism website.From a typological perspective, each level basically covers three types, indicating a certain degree of competition among scenic spots of the same level.The attraction of a scenic spot is not closely related to its price but has a strong correlation with its A-level, with higher levels of attraction generally having higher A-levels.Each scenic spot is visualized based on its attraction index, as shown in Figure 7. Based on the above analysis, the following conclusions can be drawn: (1) Scenic spots with higher A-level generally have higher attraction, meaning that the attraction of scenic spots is significantly influenced by their level.(2) A-level or above scenic spots will not decrease their attraction due to high ticket prices, which means that the attraction of scenic spots will not be significantly affected by ticket prices.(3) Due to inconvenient transportation, the attraction of some A-level and above scenic spots has been seriously affected, which means that the attraction of scenic spots is more significantly affected by transportation convenience.
(2) A-level or above scenic spots will not decrease their attraction due to high ticket prices, which means that the attraction of scenic spots will not be significantly affected by ticket prices.(3) Due to inconvenient transportation, the attraction of some A-level and above scenic spots has been seriously affected, which means that the attraction of scenic spots is more significantly affected by transportation convenience.

Tourist Experience Index
We cannot assume that tourists have had a tourist experience just because they have a greater number of trajectories, as some tourists may often take walks at nearby scenic spots and record and upload these trajectories.Although some tourists have a large number of tourism trajectories, most of which are repetitive, they have not visited multiple regions and do not have much tourism knowledge about the city.
In this study, the normalized results relating to tourist information entropy were used as the experience index to measure tourist experience values.The scenic spots visited by the same tourist were taken as the characteristic variable to calculate the information entropy of each tourist.The probability of each scenic spot visited by a certain tourist is equal to the number of times the scenic spot was visited divided by the total number of

Tourist Experience Index
We cannot assume that tourists have had a tourist experience just because they have a greater number of trajectories, as some tourists may often take walks at nearby scenic spots and record and upload these trajectories.Although some tourists have a large number of tourism trajectories, most of which are repetitive, they have not visited multiple regions and do not have much tourism knowledge about the city.
In this study, the normalized results relating to tourist information entropy were used as the experience index to measure tourist experience values.The scenic spots visited by the same tourist were taken as the characteristic variable to calculate the information entropy of each tourist.The probability of each scenic spot visited by a certain tourist is equal to the number of times the scenic spot was visited divided by the total number of times all scenic spots visited by the same tourist.The formula is shown below (12); S(T) is the tourist experience index of tourist T. For example, suppose there are five scenic spots visited by tourist T, with each scenic spot visited two, one, three, one, and one times, respectively; the total number of times all scenic spots were visited by tourist T is eight, and the probabilities of five scenic spots visited by tourist ) are P = {2/8, 1/8, 3/8, 1/8, 1/8}, respectively, with a total probability of 1.

S(T
In this study, the tourist experience index was used to measure the amount of information that tourists have about scenic spots in Sanya.Therefore, the experience index of tourists who have not visited a scenic spot is considered to be 0, indicating that they are not familiar with the city's scenic spots.The average number of trajectories per tourist was 2.6, as calculated previously; thus, only the tourists with a number of trajectories greater than 3 were used to calculate information entropy.In this sample, a total of 125 tourists met these conditions.
The tourist experience index is divided into four levels at equal intervals, and the specific rating range and corresponding number of tourists are shown in Table 5: From Table 5, it can be seen that approximately 80% of the tourist experience index is distributed in the range of [0.0-0.5].From Figure 8, it can be seen that there is still a lot of development space for these scenic spots, and nearly 80% of tourists can become potential visitors to the scenic spots.That is to say, there is still a lot of room for improvement in terms of the services offered by scenic spots.Scenic spots can be upgraded and transformed to enhance their attractiveness to tourists, allowing these scenic spots to fully leverage their cultural, natural, economic, social, and educational value.
not familiar with the city's scenic spots.The average number of trajectories per tourist was 2.6, as calculated previously; thus, only the tourists with a number of trajectories greater than 3 were used to calculate information entropy.In this sample, a total of 125 tourists met these conditions.
The tourist experience index is divided into four levels at equal intervals, and the specific rating range and corresponding number of tourists are shown in Table 5: From Table 5, it can be seen that approximately 80% of the tourist experience index is distributed in the range of [0.0-0.5].From Figure 8, it can be seen that there is still a lot of development space for these scenic spots, and nearly 80% of tourists can become potential visitors to the scenic spots.That is to say, there is still a lot of room for improvement in terms of the services offered by scenic spots.Scenic spots can be upgraded and transformed to enhance their attractiveness to tourists, allowing these scenic spots to fully leverage their cultural, natural, economic, social, and educational value.

Network Relationship between Scenic Spots
The network relationship between scenic spots was created by tracking tourism trajectories, as shown in Figure 9.In Figure 9, points of different colors and sizes represent scenic spots with different levels of attractiveness.The data on the line represent the distance between the two connected scenic spots, and the color and thickness of the line represent the number of trajectories connecting the two scenic spots.It can be seen that the closer the distance between scenic spots, the more trajectories connect them.According to the spatial distribution of scenic spots and the network relationship between them, scenic spots can be divided into three cluster areas, each consisting of scenic spots with higher levels of attraction and a certain number of neighboring scenic spots.From left to right, based on the main characteristics of the scenic spots, the cluster area can be divided into cultural heritage areas, natural landscape areas, and leisure and entertainment areas.
Figure 10 shows the number of connection trajectories corresponding to different distances between scenic spots.From the distribution shown in the graph, the distance between scenic spots can be divided into four levels: (0-8), (8)(9)(10)(11)(12)(13)(14)(15)(16), (16)(17)(18)(19)(20)(21)(22)(23)(24), and (24-+∞), in kilometers.From the graph, it can be seen that when the distance between scenic spots is less than 8 km, there are more connecting trajectories between them, with some scenic spots having more than 45 connecting trajectories.When the connection distance is between 8 and 16 km, the number of connection trajectories approaches 20.When the distance is between 16 and 24 km, the number of connection trajectories approaches 10.When the distance is greater than 24 km, the number of connection trajectories is relatively small, usually less than five.
closer the distance between scenic spots, the more trajectories connect them.According to the spatial distribution of scenic spots and the network relationship between them, scenic spots can be divided into three cluster areas, each consisting of scenic spots with higher levels of attraction and a certain number of neighboring scenic spots.From left to right, based on the main characteristics of the scenic spots, the cluster area can be divided into cultural heritage areas, natural landscape areas, and leisure and entertainment areas.Figure 10 shows the number of connection trajectories corresponding to different distances between scenic spots.From the distribution shown in the graph, the distance between scenic spots can be divided into four levels: (0-8), (8)(9)(10)(11)(12)(13)(14)(15)(16), (16)(17)(18)(19)(20)(21)(22)(23)(24), and (24-+∞), in kilometers.From the graph, it can be seen that when the distance between scenic spots is less than 8 km, there are more connecting trajectories between them, with some scenic spots having more than 45 connecting trajectories.When the connection distance is between 8 and 16 km, the number of connection trajectories approaches 20.When the distance is between 16 and 24 km, the number of connection trajectories approaches 10.When the distance is greater than 24 km, the number of connection trajectories is relatively small, usually less than five.

Conclusions and Discussion
The scenic spots visited by each trajectory were identified by utilizing tourism tory data and the spatial buffer zone of each scenic spot.At the same time, detailed mation, such as the number of trajectories and tourists visiting each scenic spot, w obtained.From the attribute information of each trajectory, the author status of the tory can be determined, and then the trajectory distributions of different tourists a scenic spots visited can be summarized.
Both the attractiveness of scenic spots and the travel experiences of tourists can simply judged by analyzing the number of trajectories or scenic spots visited.This used the normalized results of information entropy to evaluate the attractiveness of spots and the experience index of tourists.Tourists and scenic spots were selected probability variables to calculate information entropy, and the probability values o variable were calculated according to certain methods.In this study, various ter volved in the calculation process were defined, and their calculation formulas wer vided.
The scenic spots and their various levels of attractiveness generally covered types: cultural heritage, natural landscape, and leisure and entertainment.That is the same types of scenic spots have a clear distribution in terms of levels of attr while different types of scenic spots have a certain degree of parallelism in their attr distribution.When tourists travel and choose scenic spots, there is a certain degree clusivity among the same type of scenic spots.Nearly 80% of tourists have expe values below 0.5, indicating that there is still a lot of room for improvement in te

Conclusions and Discussion
The scenic spots visited by each trajectory were identified by utilizing tourism trajectory data and the spatial buffer zone of each scenic spot.At the same time, detailed information, such as the number of trajectories and tourists visiting each scenic spot, was also obtained.From the attribute information of each trajectory, the author status of the trajectory can be determined, and then the trajectory distributions of different tourists and the scenic spots visited can be summarized.
Both the attractiveness of scenic spots and the travel experiences of tourists cannot be simply judged by analyzing the number of trajectories or scenic spots visited.This study used the normalized results of information entropy to evaluate the attractiveness of scenic spots and the experience index of tourists.Tourists and scenic spots were selected as the probability variables to calculate information entropy, and the probability values of each variable were calculated according to certain methods.In this study, various terms involved in the calculation process were defined, and their calculation formulas were provided.
The scenic spots and their various levels of attractiveness generally covered three types: cultural heritage, natural landscape, and leisure and entertainment.That is to say, the same types of scenic spots have a clear distribution in terms of levels of attraction, while different types of scenic spots have a certain degree of parallelism in their attraction distribution.When tourists travel and choose scenic spots, there is a certain degree of exclusivity among the same type of scenic spots.Nearly 80% of tourists have experience values below 0.5, indicating that there is still a lot of room for improvement in terms of their experience values.We can attract more tourists to visit scenic spots by increasing advertising and service improvement, thereby enhancing their experience value.
By examining the network relationship between scenic spots, we can see that when the distance between different scenic spots is relatively close (less than 8 km), a strong cooperative relationship can be established.As the distance increases, the cooperative relationship gradually weakens.Scenic spots with higher attractiveness often have higher A-level ratings or more convenient transportation, and the correlation between the attractiveness and whether it is free or ticketed is not significant.The development of nearby scenic spots can be furthered to leverage the clustering effect of tourism resources, and the tourism market can be further developed through complementary types of tourism resources.
Future works focusing on the network relationship between scenic spots have enormous potential in terms of enhancing connectivity, collaboration, and marketing.By utilizing these opportunities, scenic spots can create a more interconnected and seamless travel experience for tourists, improve operational efficiency for managers, and contribute to the development of the tourism industry.Moreover, the network analysis results between existing scenic spots can be used to develop new tourism resources and arrange tourism service facilities.

Figure 1 .
Figure 1.Location of the study area.

Figure 2 .
Figure 2. The spatial distribution of tourist trajectories.

Figure 1 .
Figure 1.Location of the study area.

Figure 1 .
Figure 1.Location of the study area.The existing trajectory data for this study were provided by Six Legs (http://www.foooooot.com/accounts/login/,accessed on 2023.07.10), which is an outdoor travel software platform developed by Beijing Genghi Technology Co., Ltd.(Beijing, China).It provides users with powerful GPS trajectory recording capabilities, enables the convenient sharing of travel, allows diverse offline map downloads, and can be used to b

Figure 2 .
Figure 2. The spatial distribution of tourist trajectories.

Figure 2 .
Figure 2. The spatial distribution of tourist trajectories.

Figure 3 .
Figure 3. Buffer regions of each scenic spot.

Figure 3 .
Figure 3. Buffer regions of each scenic spot.

Figure 4 .
Figure 4. Average number of visits by Lo-tour and NLo-tour to the 17 scenic spots.

Figure 4 .
Figure 4. Average number of visits by Lo-tour and NLo-tour to the 17 scenic spots.

Figure 5 .
Figure 5.The number of trajectories and tourists relating to 17 scenic spots.

Figure 5 .
Figure 5.The number of trajectories and tourists relating to 17 scenic spots.

Figure 6 .
Figure 6.The scenic spot index of different scenic spots.

Figure 6 .
Figure 6.The scenic spot index of different scenic spots.

Figure 7 .
Figure 7.The visualization of scenic spots based on their attraction index.

Figure 7 .
Figure 7.The visualization of scenic spots based on their attraction index.

Figure 8 .
Figure 8. Distribution of tourist experience index.

Figure 8 .
Figure 8. Distribution of tourist experience index.

Figure 10 .
Figure 10.The number of connection trajectories corresponding to different distances (unit: km).

Table 1 .
Number of trajectories corresponding to the number of scenic spots.

Table 1 .
Number of trajectories corresponding to the number of scenic spots.

Table 2 .
The distribution of local or visiting tourists.

Table 3 .
The distribution of local and visiting tourists for different scenic spots.

Table 4 .
Attraction index, ticket price, A-level, and types of different scenic spots.

Table 5 .
Tourist experience index grading.

Table 5 .
Tourist experience index grading.