CIM-enabled quantitative view assessment in architectural design and space planning Vikrom Laovisutthichaia,c, Maosu Lib,*, Fan Xuea, Weisheng Lua, and Anthony G.O. Yehb Department of Real Estate and Construction, The University of Hong Kong, Hong Kong SAR, China Department of Urban Planning and Design, The University of Hong Kong, Hong Kong SAR, China c Department of Architecture, Chulalongkorn University, Thailand *Corresponding author E-mail: vikrom@connect.hku.hk, maosulee@connect.hku.hk, xuef@hku.hk, wilsonlu@hku.hk, hdxugoy@hku.hk a b This is the authors’ version of the paper: Laovisutthichai, V., Li, M., Xue, F., Lu, W., & Yeh, A.G.O. (2021). CIM-enabled quantitative view assessment in architectural design and space planning. In Proceedings of the 38th International Symposium on Automation and Robotics in Construction (ISARC2021), 1-5 Nov 2021, Dubai, UAE. (Plenary talk). DOI: 10.22260/ISARC2021/0011 The final version is available at: https://doi.org/10.22260/ISARC2021/0011 5 10 15 20 Abstract A view is among the critical criteria in an architectural design process. Presently, it is assessed by conventional site observation, labour-intensive data collection, and manual data analysis before designing a building mass, planning, façade, openings, and interior space. City Information Model (CIM), with its capabilities to store, visualize, and analyze a wealth of site-related information, has a great potential to support an automated view assessment. However, its realization is nascent. CIM has not integrated with architectural space planning in either research or practice. This research, therefore, aims to develop a model through which CIM can be extended to assist view assessment in architectural space planning. By literature review, brainstorming, prototyping, and case study, this research corroborates that by harnessing the power of CIM, the conventional view evaluation can be transformed from qualitative to mix-used. It helps practitioners assess a view and design a space in a more precise and rapid manner. This research also provides the integrated model for view evaluation in architectural space planning with three implementation stages to support the real-world practice. Future studies are recommended to develop the proposed model further and integrate it with multiple criteria to advance the generative design. Keywords – Architectural design; Space planning; View assessment; City information model; Generative design 1 25 Introduction The characteristics of the view outside a window considerably influence the occupants’ well-being, stress recovery, building comfort, working productivity, as well as sleeping quality [1-4]. In healthcare architecture, the preferred view, including green and natural scenes, can improve patients’ satisfaction, shorten a hospitalization period, and ultimately enhance recovery after medical treatments [5]. Because of these significances, the building 30 35 orientation, shape, form, envelope, space planning, openings, fixture, furniture, and decoration are usually designed to capture a great view and maximize its benefits to a project. In some building types, including hospitality and wellness architecture, a view is highly prioritized during design to achieve higher star ratings and improve clients’ satisfaction. The gorgeous view must be well reserved for important spaces, e.g., bedroom, living, dining, and working areas, while service spaces, e.g., storage and mechanical rooms, are located in a place with a less impressive view or without a view. In Hong Kong, for example, the triangular bay window is used for the hotel space planning and façade design to capture the breathtaking view of the Victoria harbour (see Figure 1). Figure 1. The architectural space planning and façade design to capture a preferred view [6] 40 45 50 In the current architectural design practice, the view is assessed manually before conceptual design, mass development, and space planning by visiting a site, exploring surroundings, and using a camera or drone to capture photos in every level and direction (see Figure 2) [7-9]. Then, all images are reviewed and analyzed manually by a design team using criteria, such as view types, content, distance, quality, and surroundings’ future development [10]. Apparently, this view evaluation method is time-consuming, labour-intensive, and costly. The process highly depends on the designers’ perception and perspective without automatic tools to help the determination process, while other design criteria, including climate and energy consumption, already have advanced computational tools to simulate and facilitate precise and rapid decision making. Furthermore, additional site visits or drone flights are sometimes required when vital information is not collected in the previous visit [7]. Therefore, this process urgently needs an effective tool for supporting view evaluation in architectural design practice. 2 Figure 2. View assessment in architectural design, space planning, and orientation 55 60 With the advancement of 3D reconstruction and remote sensing technology, the emerging city information modelling process starts to develop the City Information Model (CIM) and serve for urban data processing, simulation and visualization, analysis, and design [11]. 3D city models as the baseline of CIM have been used widely in various smart applications due to their high accuracy of geometry and digital reflection of the real world. The location-based application covers a broad spectrum of fields such as navigations in transportation [12-13], disaster simulation in emergency response [14-15], utility and facility management in smart city construction [16-17], site design in urban planning and development [18-19], and big data analysis in urban computing [20], etc. Harnessing its power, studies in the field of architectural design have also presented numerous new findings, involving window design [21], solar estimation [22-23], as well as ventilation analysis [24]. 65 70 75 80 85 90 95 Recently, Li and Samuelson [21] and Li et al. [25], have validated the utilization of CIM can realize a highly accurate and automated window view assessment within the context of individual window lattice design and urban-scale view evaluation. CIM is also expected to help the architectural space planning and interior arrangement. However, this potential approach is rarely discussed in the previous literature. Moreover, the implementation process in real-world practice remains unclear. What is urgently needed is not only the program development but also the integration of CIM into the current design practice. This research, therefore, aims to develop CIM to assist view assessment in architectural space planning. It is achieved by adopting a 5-step research method: empathizing the view evaluation in architectural design, defining the practice challenge, brainstorming the potential solution, developing a CIM-enabled quantitative view assessment model, and finally validating through the case study in Hong Kong. The remainder of this paper is structured as follows. Section 2 provides the literature review related to a view, traditional view assessment process, and simulation-based view assessment. Section 3 describes the research methods. It is followed by the proposed model in section 4 and case study implementation in section 5. Finally, it reaches the discussion and conclusion part. 2 Literature review 2.1 Architectural design Architectural design is generally a highly creative and dynamic process to manage available resources, resolve difficulties in the built environment, and finally establish the environmental conditions for activities [26]. This process can be regarded as a Multi-Criteria Decision Making (MCDM), since it copes with various factors in the complex social realms, such as users’ requirements, site conditions, laws and regulations, functionality, feasibility, technologies, and aesthetics [27-29]. Recently, it is demanded to mitigate more difficulties in the Architecture, Engineering, and Construction (AEC) industry, including manufacturing and assembly processes [30], sustainable building life cycle [31], and construction waste minimization [32]. According to the real-world case study, it is currently an arduous task, if not entirely impossible, for practitioners to understand, scrutinize, and reinterpret all factors before locating them into one design [33]. Assistive tools, such as Computer-aided design (CAD), Building Information Model (BIM), virtual reality, and design management software, are indeed required to help this intricate process [26, 33-34]. 2.2 100 105 A view In architecture, a view is a visual connection with the outside world, allowing occupants to keep in touch with ongoing activities, time, and seasonal changes [35]. It can be regarded as one of the basic human needs, since the view provides humans information about the environment for their feeling of safety [36-37]. The view is separated into three main layers with different purposes [35]. Firstly, the sky is a source of natural light and weather information. Secondly, the city or landscape part provides information related to the environmental condition and surroundings. Lastly, the ground is to observe or recognize ongoing activities outside. Due to the significance of view in architecture, several view assessment measures have 4 110 115 been proposed for practitioners (see Table 1). The measures include, for example, the categories of view or information content received from exterior view [35]. Many studies agree that the view of nature, garden, and well-landscaped area tends to be more preferred by occupants than the city and urban environment [2-3]. This view type can positively change the emotional state and increase occupants’ satisfaction [1]. The content and composition of sky, land, ground, building, and city, also affect the view attractiveness. A wide view, containing more information, is more interesting than a close and narrow one [43]. Furthermore, the quality of view outside is influenced by the density of both internal space and surroundings [2]. Sometimes, the openings and outside world can also affect occupants negatively [35]. For instance, the window facing directly to other buildings or service facilities may be harmful to privacy. Table 1. Examples of view assessment criteria No 1. 2. 3. 4. 120 125 135 140 145 References [2-5, 35] [35] [2] [2, 35, 38, 43] However, the perception of beauty and satisfaction of view may be varied. It depends on not only the view itself but also occupants and how we design the frame to capture it [38]. The quality and impact of view also associate with the architectural mass and form, façade, interior space arrangement, and windows’ type, size, and mullion [10]. Architecture must be well designed and crafted carefully to capture the best view outside. However, in reality, the view must be balanced and weighed with other criteria, e.g., functionality, feasibility, and laws and regulations. Each criterion requires a large amount of information to be collected and pondered together. It is a herculean task for practitioners to handle this wealth of information from every design aspect at one time. Thus, assistive tools for architectural design are necessary. 2.3 130 Criteria View type View composition Density Distance and privacy Simulation-based view assessment The simulation method as a convenient and effective tool has been widely adopted in the architectural design field. For the simulation-based view assessment, there are some methods developed utilizing projection [39], raytracing on hand-made models [40-41], or a fish-eye lens [39, 42]. However, they tend to rely on more manual work and thus are inefficient. Recently, a new technological window of opportunity opens for this study, consisting of more open-source and textured 3D city models, mature 3D view capture APIs, and robust online computer vision tools. Existing 3D city photo-realistic models from all kinds of resources can depict buildings and their neighbourhood environment without users’ initial effort, while making full use of 3D view capture techniques and computer vision tools can help visualize and quantify the view photos with higher automation and accuracy. For instance, Li and Samuelson [21] integrated the outside view assessment as an input into the window frame design effectively by using 3D city models within Google Earth Studio. The simulated views were assessed using the criteria including window direction, openings’ geometry, and human preference. Li et al. [25] classified the window views into two groups, natural and urban, for a city-scale view situation assessment. By harnessing the power of deep transfer learning and a high-automated 3D visualization platform, the window views of nature were distilled automatically, and consequently, a great potential of more view assessment-based applications has been activated. Their studies found that the view images generated from photo-realistic 3D city models are similar to the ground truth images in the 150 real world, and the assessment of views can reach a high accuracy by pixel statistics. However, there exists a gap in connecting the automated view assessment method with the building space planning in light of a more comprehensive judgment. Space planning concerning a view assessment may gain more momentum from these new technological breakthroughs in terms of efficiency and accuracy. 3 155 160 165 Research methods This research comprises five stages to provide researchers with insights from architectural design practice, constitute knowledge contributions, and ultimately resolve real-world challenges (see Figure 3). It began with a comprehensive literature review to gain a holistic view of the current architectural design practice, view evaluation method, and CIM performance. Secondly, all information was analyzed, redefined, and discussed with practitioners to highlight critical challenges in the view assessment. It was followed by brainstorming to explore the potential solution in the third stage. This stage was to fabricate innovation in complex social conditions and bridge the gap between theoretical knowledge and design practice. In this research, the solutions were to identify view evaluation criteria for architectural design and develop a CIM-enabled view assessment model. The fourth stage was mainly about developing CIM as an assistive tool for assessing, visualizing, and facilitating the architectural design process, and aligning with the current practice. Finally, the proposed model was validated and improved through a case study implementation in Hong Kong SAR. Figure 3. Research methods 6 170 4 The integrated model for view assessment in architectural space planning After reviewing the literature, redefining the real-world challenges, and brainstorming the potential solutions, the new view assessment model is generated (see Figure 4). It is the consolidation of simulation-based view assessment and traditional site observation and evaluation for facilitating precise and rapid decision making. 175 Figure 4. The integrated model for view assessment in architectural space planning 4.1 180 185 Traditional view assessment At the beginning of the architectural design process, the design team visits a construction site to observe site-related factors. The collected qualitative data include, for example, surroundings, site terrain, wind direction, existing features or structures, traffic and transportation, noise, as well as view quality. Moreover, alternative data is also gathered for further analysis, discussion, and decision-making, such as maps, drawings, and pictures. In this stage, the team uses multiple tools to collect data of the site and surroundings [7-10], including a camera, drone, laser distance meter, surveying instruments, etc. The data is then analyzed manually by several methods, e.g., sketches and diagrams. 4.2 Simulation-based view assessment Apart from the physical site observation, the advancement in CIM and computational technology can support the simulation-based view assessment and strengthen the design. Its realization comprises three main stages (see Figure 5). 190 Figure 5. Workflow of simulation-based view assessment 4.2.1 195 The process initiates with a 3D city model and 2D site preparation, and critical criteria selection. The criteria should be well selected and prioritized depending on specific project conditions, such as users’ requirements, building function, site location, and surroundings. This study searched through the scientific database and generates a list of view assessment criteria for practitioners to choose from (see Table 1). 4.2.2 200 205 Input Data processing The data processing consists of three key steps: geographic registration, observation site determination, and view site sampling (see Figure 5). Firstly, the 2D site is registered to 3D city models through coordinate transformation and matching to identify the development area. Thereafter, in light of the site settings such as shape and neighbourhood environmental characteristics, the representative observation site can be determined. Then to examine the view disparity quantitatively, the view site at eight directions are sampled from 0° at different heights. A sample height h (h=5m) is set here to simulate the view situation of different floors. 8 4.2.3 210 215 As having a view of nature can result in a higher preference for the urban landscape, we set view type as an example criterion to demonstrate the semantic extraction and mapping process. The view features are classified into nature and urban groups in this study. Li’s method [44] is utilized to visualize and quantify the two indices automatically. Firstly, by mounting the virtual camera at the sample view sites of photo-realistic 3D city models, the view photos are captured in batch. Thereafter, one of the best pre-trained deep learning models on Cityscapes, Deeplab v3, is transferred to segment the view photos automatically. Making full use of its urban understanding, 19 classes of view features are detected and then mapped into two target groups using a multimodal regression. In the end, the predicted index of each view photo is collected with high accuracy and reliability. 4.3 220 225 230 235 Architectural space planning considering the view assessment Finally, the quantitative results from the previous stage can be used together with traditional view assessment from the site observation during the entire architectural design process. After gaining various project information, the design team considers the view assessment result and other factors in developing the initial concept design in responding to the identified problem. The building’s mass, form, and zoning are decided in this early stage. The important space is typically placed on the level and area with the best view in a site, while the back of the house or service zone is usually placed in an area with less potential or lower view quality. Then, this conceptual model is developed and detailed. The architectural plan, functions, rooms, circulations, and building envelope are designed with the consideration of view assessment results, site surroundings, and other factors. Typically, the important functions such as a lobby, living, and dining, are allocated to enjoy a preferred view, e.g., green area, open space, and harbourfront area. In interior design, the view evaluation result is also used for space and furniture arrangement. The position and location of all room features should be well located to make occupants enjoy the excellent view outside the openings. It can be seen that throughout the entire process, the design team refers to the view evaluation results while developing the design and generating sketches, drawings, and models. 5 240 Semantic extraction and mapping A Case Study To validate the feasibility of the integrated approach, the Pokfield campus, the University of Hong Kong, Hong Kong SAR, was selected to be a case study. This planned building site would be redeveloped into a new office and education architecture with a height of around 90 meters. The experimental process workflow is displayed in Figure 6. Figure 6. The implementation of proposed model in the case study 245 250 The process began with the physical site observation. This stage had several difficulties. Firstly, due to the complicated site terrain and surroundings, the team could not capture the view from every direction and level without assistive tools, e.g., a drone. Furthermore, some photos were taken from entering surrounded buildings. It was indeed a tedious and timeconsuming task for practitioners. This result increases the potential of using computational technologies to aid the complicated design process. All data, including photos of view and surroundings, maps, and drawings, was then used for the traditional analysis (see Figure 7). It reveals that the visibility to natural elements such as mountains, sea, and vegetation, is blocked by high rise high-density constructions in many 10 directions and levels. However, what remains unclear is the exact level or angle to improve the detailed design of planning, interior space arrangement, openings, and façade design. 255 260 Figure 7. Traditional view analysis Apart from the traditional method, the simulation-based view assessment was implemented into this case study. The curation of the datasets included 2D site design data and 3D photorealistic city models in this study. The 2D design of the case site, collected from HKU Estate Office [46], measured the site geometry accurately, from which the key view site can be determined by architects and engineers. The sketch map is shown in Figure 8a. 3D mesh models were collected from the Planning Department [45], Hong Kong SAR for surrounding environment expression, as shown in Figure 8b. 265 270 275 Figure 8. Data preparation of the case planned building site. (a) 2D site design, and (b) target building site and its environment. Cesium (version 1.73) as an open-source 3D visualization platform was used in this study to load 3D city models and generate the view photos through computer programs. The deeplab v3 model within the Tensorflow (version 2.4.1) framework was to segment the view photos. Then the multimodal regression was finally implemented in the data mining platform Orange3 (version 3.26.0). The whole process experimented in a workstation with an Intel i710700 CPU (2.90GHz, 16 cores), 128 GB memory, an 8G Nvidia GeForce RTX 2070 SUPER GPU, and Ubuntu 20.04 64-bit operating system. By implementing the view assessment workflow (see Figure 5), each direction of the building site has a portfolio of nature view indices. The heat map representing view index distribution around the case planned site was visualized (see Figure 9). The nature view index ranges from 0 to 1, from which 0 indicates ‘poor’ and 1 stands for ‘excellent’. 12 Figure 9. The simulation-based view assessment result 280 285 290 295 The simulation result reveals a huge different possession of natural resources in different directions and heights, which further reflects the design. The design team can use this detailed result and reinterpret it for architectural space planning and design development (see Figure 10). For instance, the lower part of the building site tends to have lower proportional nature views, such as the area ranging from 180°and 315° horizontally, and from ground level (0m) to 15m vertically. This podium area can be planned for support functions, which are not required a good view, such as circulations, storage, and mechanical, electrical, and plumbing systems. On the other hand, the upper-level part has a more favourable view, especially in the area ranging from 45°and 235°. This tower part should be reserved for the office, classroom, meeting room, library, research unit, etc. In some specific directions, the nature views are obviously scarce, such as the direction ranging from 315°(Northwest) to 0°(North). The vertical circulations or building systems may be placed in this area. Last but not least, in some directions, the nature views are of significant variation from the vertical dimension, i.e. the direction from 135° to 315°. This view assessment result was then weighed and balanced with multiple criteria, e.g., users’ requirements, site conditions, building comfort, laws, and regulations, and construction method for architectural detail design, to generate the design and construction documents. Figure 10. The application of simulation-based view assessment for architectural space planning 300 This implementation corroborates that understanding and making full use of the view resources distribution could benefit architects to have a more comprehensive space planning. Moreover, the computational tool can be utilized to confirm the result of traditional view assessment and add more details for precise and rapid design decision-making. 14 6 305 310 315 320 325 330 335 340 Discussion and Conclusion Architectural design is stipulated to consider emerging criteria in the Architecture, Engineering, and Construction (AEC) industry, e.g., sustainability, manufacturability, and assemblability. These demands make the process more complicated and time-consuming, and consequently, design guidelines and supporting tools are urgently required. In the early design stage, a view is a crucial factor affecting the building form, mass, void, and space planning. Presently, the view evaluation process is labour intensive without computational tools like other design criteria. City Information Model (CIM), with its capability to manage a large amount of information, is one of the promising approaches for the view assessment, but its realization should be discussed in more detail. This research develops CIM to be an assistive tool for view evaluation in architectural design. By adopting the 5-stage research method, this research affirms that CIM is a lessexpensive virtual platform supporting view assessment before architectural space planning. CIM can be implemented in three main stages: 1) input, 2) data preprocessing, and 3) semantic extraction and mapping. It transforms the evaluation process from qualitative to mixed methods: combining qualitative and quantitative data. It can be integrated with the physical site observation to support rapid and precise architectural space planning and design decision-making. This result also supports the current thought of generative design, where computational intelligence can automatically generate floor plans from project conditions. Despite its advantages, the practice of CIM-enabled view assessment in architectural design also has several challenges and limitations. For instance, it requires a huge effort to collect related information and build a digital model before simulation and automatic evaluation. The proposed model is therefore efficient to be utilized for a site with high density and complicated surroundings like Hong Kong. In addition, there is no “one size fits all” solution for every project. The view assessment criteria and CIM model development may be varied depending on particular conditions. Moreover, in reality, a view is merely one of the numerous architectural design criteria. The view analysis results have to be weighed and balanced with other factors, e.g., users’ requirements, site conditions, laws and regulations, feasibility, and aesthetics, before including in a project. This study constitutes both academic and industry contributions. Firstly, the proposed model moves the rhetoric closer to reality by integrating CIM with real-world architectural design practice. The result affirms CIM’s capabilities to aid the architectural design process, and highlights several core challenges. For practitioners, this research also provides the integrated model for view assessment in architectural space planning with three stages of implementation and practice example. However, this is merely the beginning of simulationbased quantitative view assessment and architectural design. As this study is grounded on the archival study and one case study in Hong Kong, additional cases from different contexts are necessary for generalization and model improvement. 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