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Article

Architectural Graphics Research: Topics and Trends through Cluster and Map Network Analyses

by
Vicente López-Chao
* and
Antonio Amado Lorenzo
Departamento de Expresión Gráfica Arquitectónica, Universidade da Coruña, Zapateira, 15071 A Coruña, Spain
*
Author to whom correspondence should be addressed.
Symmetry 2020, 12(12), 1936; https://doi.org/10.3390/sym12121936
Submission received: 20 October 2020 / Revised: 16 November 2020 / Accepted: 23 November 2020 / Published: 24 November 2020
(This article belongs to the Special Issue Advances on Engineering Graphics: Improvements and New Proposals)
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Abstract

:
Graphic representation is a fundamental language in architecture and engineering because it facilitates the communication of any type of information. Therefore, professionals and students need continuous and updated training, with scientific references being the best source of knowledge. However, accessing the latest findings is a complex process for people in the professional world or without an extensive research background since there are no specific filters in the databases, such as architectural graphics. This manuscript aims to define the research topics and trends in architectural graphics as a point of reference for novel professors and new researchers in graphics or drawing. A database on the Scopus-indexed scientific production of the professors of architectural graphics from public architecture schools in Spain has been developed. Furthermore, cluster and map network analyses have been performed using VOSviewer with different levels of co-occurrence to define what this group of academics investigates and how the issues are related. The results evidenced a structure in four categories: the philosophy and theory of architectural graphics, the theory of geometry in architectural heritage, the application of digital graphics in architecture education and urban design management. Research gaps are mentioned and a base framework for the future of research in architectural graphics is proposed.

1. Introduction

Graphic representation is the language that allows engineers and architects to communicate ideas that would be very difficult to explain with words. Likewise, it is a challenge to train the skills and abilities required to master this language.
The new didactic approach in higher education combines lectures and interactive sessions, which arises as an opportunity to promote the learning of geometric problems applied to real cases that shed light on the theoretical abstraction that students face. This situation deals with the progressive reduction in course hours regarding the subjects of Graphics (in Spanish, Expresión Gráfica) [1], both architectural and engineering graphics. Faced with this readjustment of schedules, students have less opportunities to develop and assimilate essential skills and content for their professional practice as professionals of engineering or architecture.
Professors of engineering graphics have initiated an adaptation to the European Higher Education Area (EHEA) regarding the practical application of a diversity of teaching methodologies [2]. However, the presence of ICT-based methods is very low, even though they stimulate professors and encourage the proactive attitude of students and develop their spatial capacity [3]. Furthermore, Redondo et al. brought to light the need to promote research to improve teaching in architectural graphics, in a manuscript in which the sources were basically from engineering graphics [4], which provides a vision of convergence.
Both architecture and engineering entail strong professional components which share the need to technically communicate accurate information. Therefore, orthogonal representation or axonometric views are useful for the plans of a house (architecture), an object (manufacturing engineering) or a bridge (civil engineering), among other disciplines. However, architecture requests to represent relevant issues far from the technical approach, such as the haptic perception of space and the big idea or decision behind a design proposal (also known as parti). It is, therefore, appropriate to learn from other graphic disciplines to develop a framework for theoretical and empirical research in architectural graphics.
This paper aims to delve into the research topics and trends in architectural graphics. Engineering graphics references will also be used for this purpose. The literature is structured on the topics of international conferences of engineering and architectural graphics organized in Spain, illustrating different methods of representation useful in scientific research. Subsequently, cluster and map network analyses are conducted on SJR (Scimago Journal Rank) publications and bibliometric data of the architectural graphics faculty of all the Spanish public architecture schools.
The professional nature of architecture has led to less of a scientific research culture than other sciences, accompanied by low production of indexed papers [5]. For this reason, the value of this study lies in the difficulty of finding quality research references, since the databases do not include specific metadata on this area of knowledge.

2. Graphic Analysis Research

Architectural graphics has been mainly understood as descriptive geometry and the analysis of architectural forms. However, there are currently useful applications that offer connections among theory and practice.
The research fields in graphic analysis have been structured considering the topics of the international congresses organized in Spain of engineering and architectural graphics. The reason is that these events include current teaching and research. The following conferences were used as a source of topics: XVIII Congreso Internacional de Expresión Gráfica Arquitectónica (XVIII EGA), XIV Congreso Internacional de Expresión Gráfica aplicada a la Edificación (APEGA 2019) and 29 Congreso Internacional INGEGRAF (INGEGRAF). The contents have been combined in six research fields: techniques and theories of graphic analysis, innovation and creation, design and manufacturing, education, heritage and history and analysis of the territory.

2.1. Techniques and Theories of Graphic Analysis

The first field of research corresponds to the set of techniques and theories of graphic analysis (see Table 1). Its topics are correlated with the other six fields of research since it includes the graphic tools of applied research, among which the following stand out.
  • Representation and graphical analysis. This topic includes research such as the study of urban representations in Leonardo da Vinci’s manuscripts [6], formal and composition analysis [7], descriptive analysis of buildings [8], the model as an analytic tool in training [9], the historical analysis of the city of Cádiz [10], the elaboration of graphic criteria through the first planimetries of the Granada territory [11], the thought of fundamental graphic elements, such as the line [12], or the solution of complex geometries in the case of fire [13]. The analysis of architecture and urban planning from graphic techniques has been the most important set of methods throughout history. These contributions are of great interest as they provide a scientific approach in terms of explaining the research procedure, design and data collection.
  • Photogrammetry consists of the three-dimensional digital representation of an element from the capture and processing of photographs. Some of its applications are the verification of structures [14], the control and management of land use and coverage [15], structural, stratigraphic and natural scenery analysis for purposes related to archeology, chemistry or biochemistry [16,17]. Other aspects have focused on exploring proposals to evaluate the accuracy and precision of photogrammetric mappings, such as through the variation of the number of control points [18] or the use of sub-pixel technology [19], also presenting the development of automatic procedures that take advantage of satellite images to draw building plans [20]. Both this technology and other surveying procedures, such as laser and LIDAR (Laser Imaging Detection and Ranging) scanners, have brought enormous advances in heritage conservation. This is because they are very accurate documentation methods, especially when working with ancient buildings with structural deformations and cracked, worn or damaged finishes (such as texture and color).
  • Computer-aided design (CAD) and Computer-aided engineering (CAE) incorporate graphical tools and methods that benefit from digital environments. Some of its applications are to recreate elements and their subsequent analysis, such as the study of press and beam towers for the extraction of oil from olives [21], the recovery of industrial heritage in educational settings [22] or the digital reconstruction of disappeared historical heritage [23]. CAD has favored many design tasks, such as the tracing technique and the drawing of complex geometries, above all in terms of speed and accuracy. Likewise, it has provided the possibility to model and to display interactive three-dimensional architecture.
  • Building information modeling (BIM) is an architectural information management tool arranged in a three-dimensional environment that allows to combine the dispersed information of a project [24]. It has had a great impact on architecture and engineering education through the use of software such as Revit or ArchiCAD [25,26]. It is one of the newer technologies and offers many opportunities to manage and analyze architecture.
  • Virtual reality (VR) and augmented reality (AR) have been the focus of research with the aim of providing an immersive visualization of 3D models. They are useful tools for the teaching of architecture projects [27] and for the development renewable energies projects [28]. VR and AR provide an environment to visualize architecture in which the user chooses from where to perceive the building. Therefore, they are an attractive tool in education and an effective tool for assessing projects before spending large amounts of money and building them.

2.2. Innovation and Creation

The second field encompasses innovation and creation research (Table 2). The topics it involves are fundamental in the area of architecture; they correspond to the artistic or creative approach that tries to understand the decisions behind the design, or propose new ones.
These include analyses of documentary sources such as pedagogy manuals on descriptive geometry [29], historical images of architectural heritage [30], foundations of the theory of graphic representation [31] on the appearance of geometric constructions, such as the oval and its application in case studies in the construction of vaults in the 16th century [32], such as color theories in the applied case of Le Corbusier’s combination criteria through a navigable 3D model [33] (see the color analysis result in Figure 1b), and the evolution of hand drawing on digital platforms [34] (see digital sketching example in Figure 1a). In this sense, Figure 1a,b provide a vision of the diversity of graphic contributions, from digital sketching related to the representation of haptic perceptions to the technical analysis on the combination of colors by a renowned architect.
It also includes contributions to the importance of drawing in architectural thought, as in the case of Rafael Moneo [35], or the analysis of leisure drawings made by architects and their relationship with the first creative sketches of their projects [36], on the qualities of different forms of representation, such as the diagram [37], and the comparison between perspective, photography and infographics [38].
This field also includes geometry theories, such as the design process of complex vaults [39] (see Figure 2c), the geometric and symbolic approaches in medieval Gothic constructions and their comparison with other designs [40] (see Figure 2b), the proportions of the design criteria of ecclesiastical buildings through graphic re-composition [41], the study of its traces [42,43,44] (see Figure 2a), the categorization of the geometric solutions of vaults in a geographical area [45] and the analysis of dimensions of century walls to find out their construction rules at the end of the 13th century [46]. In this case, the images provide different CAD overlay techniques. First of all, the layout traces are defined on the buildings’ perimeter to locate the complex construction geometries under study. In the second case, a theory of geometric composition is overlaid on a church plan to evaluate whether the architectural design of an ecclesiastical order corresponds to patterns that may be useful for the preservation of the original state of other similar constructions. Finally, a geometry overlay is displayed on the orthophotographs of a typology of vaults to be able to compare them.

2.3. Design and Manufacturing

The third field incorporates the topics of design and manufacturing (see Table 3). Research is related to the process and the possibilities of modeling through CAD software, and its subsequent materialization through digital manufacturing [47], the design of methods for the automatic analysis of the parts that will be physically obtained after modeling to improve performance for subsequent uses [48], the preservation of aerospace heritage through low-cost manufacturing techniques for high-precision models [49] (see Figure 3), 3D scanning for the production of elements, such as prostheses [50], or food to design its packaging [51], and even the generation of ephemeral architecture [52].
Despite the fact that architectural models have been fundamental elements of ideation, work and communication, there are still not many applied studies on their possibilities. Figure 3 shows the possibility of elaborating full scale high-detail models in an engineering case study. This technology can be useful for prototyping mechanical structures or for experiencing an architectural element through touch.

2.4. Education

Regarding education (see Table 4), issues related to digital benefits have been explored, such as 3D modeling in universities [53], the possibilities that virtual environments offer to architecture and engineering students [54], the use of augmented reality [3,55,56], smartphones [57] and innovation of teaching methods for learning the cadaster and remote sensing [58].
Didactic innovations have also been provided, such as the inclusion of active methodologies in descriptive geometry to promote critical thinking [59] and the introduction of collaborative modeling environments for project management demanded by Industry 4.0 [60]. Spatial skills have been a special focus of interest, methods for their training have been proposed [61,62] and the effect of different digital tools on improving this competence has been compared [63], as well as the improvement of other skills, such as graphic creativity through digital manufacturing techniques [64].
The implementation of augmented reality has been very promoted in the last decade to improve graphic skills, satisfaction, motivation or performance in learning urban planning, constructive elements (see Figure 4b) and musical instruments [65,66,67]. The first case comes from an interactive explanation of the phases to draw an architectural drawing in which annotations were also added, which goes beyond the problem of drawing on paper in a lecture class. In the second case, the use of a mobile device is shown to apply AR technology to display a 3D model in the student environment, which allows comparing and perceiving its dimension.
This field is consistent with the teaching function of researchers at Spanish universities, which is to improve their teaching based on empirical evidence. Sharing these findings and disseminating research allows for collaborative improvement of architecture training. There are still many untapped possibilities that we can subtract from the rest of the research fields of this framework.

2.5. Heritage and History

A research field of increasing interest is related to heritage and history (see Table 5). It includes urban studies, such as the transformation analysis of the historic core of a city or a town, such as the case of Oviedo [69] (see Figure 5a), or on the original color of these places to restore their chromatic characteristics [70].
It also comprises research on industrial and architectural heritage regarding their descriptive and functional digital modeling [71,72], including anastylosis processes [73] (see Figure 5b) as well as the detection of peculiar construction solutions, the definition of a chronology of their construction phases and the collection of important data related to the restorations [74] (see Figure 5c), the digital recovery of ancient engineering techniques, such as the metallurgical case of the Almadén mines [75], or archaeological sites from the Bronze Age [76].
Other studies have proposed procedures to develop the BIM model that relates the historical information and the development of the life of a building [77], to define different levels of knowledge [78] or to obtain high-detail BIM models considering the complexity and deformations of historic buildings [79,80]. In addition, the precision of historical maps of the same city has been compared through carto-metric analysis in order to know the veracity of its geometric precision [81].
Heritage analysis has been the focus of research in architecture. This translates into a visible richness in these examples, showing a wide variety of graphical techniques to answer different research objectives. In the first case (Figure 5a), CAD techniques are used to locate historical reference points. In the second (Figure 5b), the vision on the data management through BIM of an anastylosis procedure is provided in which each color contains a type of information. The third one (Figure 5c) provides an example of surveying with a point cloud photo-texture, combining accuracy and color.

2.6. Analysis of the Territory

Territorial analysis techniques and tools have also become an essential line of research (see Table 6). Some of the examples explore information processing through Geographic Information Systems (GIS) and its various practical applications.
These include cartographic management, space planning, land and resource assessment or planning in areas such as agriculture and environmental studies [82,83], the elaboration of plans on seismic parameters [84] or the development of a dynamic spatial model to visualize and analyze the built heritage on a territorial scale [85] (see Figure 6c).
Another representation possibility consists of the comparison of procedures to map urban areas using mobile and fixed systems [86]. In this context, photogrammetric techniques have been applied to obtain measurements related to the geomorphology of the terrain or the geometry of facilities in urban areas [87,88,89], as well as for the detection of volumetric or shapes changes due to erosion [90,91].
Information layer overlays have also been applied in order to identify urban realities, such as those related to noise pollution [92] (see Figure 6a), or data mining from digital networks to identify spatial patterns related to an architectural work as well as its area of influence [93] (see Figure 6b). In addition, graphic evaluation tools have been utilized for the evaluation of urban interventions [94], including the manufacture of urban models as a production for transfer to society [95].
Although urban management has been the subject of study since the development of the first cities, new information management methods allow evaluations of a large amount of information. In addition, it is possible to vary the types of criteria and analysis to know the use of human beings on the territory, establish relationships and patterns or develop predictive models of the city. Some of these examples are arranged in Figure 6, in which it is analyzed through citizen participation that is georeferenced in Instagram photographs (Figure 6b) and patterns are generated from built architectural heritage. On the other hand, Figure 6a shows CAD overlay methods that are used to perform analyses that, far from being so technical, allow us to reflect on what mobility patterns were like in the city based on issues such as the sound of church bells.

3. Materials and Methods

This graphical analysis review includes both architectural and engineering references. However, the previous research fields do not necessarily reflect the whole reality of architectural graphics research. This article aims to define the trends and research topics in architectural graphics.
This research follows an empirical documentary design based on textual data of the scientific papers by the architectural graphics professors of all the Spanish public architecture schools. The web page of each architecture department was accessed to prepare a list of the architectural graphics professors in Spain. Then, their Scopus profiles were searched and the list of manuscripts from each professor was collected along with their bibliometric information. Note that only documents dated until 2019 were included. In this process, up to five profiles of the same professor appeared due to variations of their name in the metadata.
Subsequently, network maps and cluster analyses based on written sources were applied through VOSviewer to obtain a co-occurrence map that evidences the frequency and networks of the most used terms in titles, abstracts and keywords. This system counts the frequency of use of each term and allows establishing a minimum value of occasions in which a term appears to be included in the analysis (a minimum level of relevance) and displays bibliometric maps which are especially useful for displaying a large amount of information in an easy-to-interpret way [96]. Therefore, an exploratory top-down procedure has been performed (from the generic to the particular) to provide a solid structure of the research trends in architectural graphics. Previous researchers have evidenced the usefulness of clustering scientific publications through VOSviewer [97], and in addition to that, its interactive interface is very useful for exploratory studies [98].

3.1. Source of Information

Many bibliometric studies use a WoS (Web of Science) or Scopus database. In Spain, the Comisión Nacional Evaluadora de la Actividad Investigadora (CNEAI) assumes a high quality of Scopus journals in the area of architecture. The Scopus database has been considered because it represents the sample of architecture research better than WoS as it provides a broader vision. Otherwise, the sample would be much smaller and representation would not be provided.

3.2. Sample

The sample consisted of 292 architectural graphics professors. The typology of manuscripts under analysis is papers with a number of 384 contributions from 2004 to 2019.

4. Results

4.1. Cluster and Network Map Analyses: Co-Ocurrence Fields—Title and Abstract

Written information was obtained from the title and abstract fields of all the publications indexed in Scopus by the architectural graphics faculty following the complete count method, amounting to a total of 10,551 terms. The minimum value of co-occurrence of the terms was experimented with values between 2 and 10 times. The need to test different values lies in the number of publications in the study. In this case, two models are proposed (co-occurrences of 5 and 8) that correspond to two different levels of definition of the constructs. This exploratory strategy aims to validate the structure. The results have proven the robustness of the general structure and, on a deeper level, the interrelation of topics due to the possibility of applying each graphical method to analyze them. In other words, the holistic structure is maintained but relationships between the categories can be understood.
Co-occurrence model 8 (see Figure 7): 369 terms meet this limit, for which the analysis establishes an importance value. This was used to select the 60% of the most relevant terms (n = 221) to perform the graphical network map analysis. A model structured in four clusters was obtained with 7898 links and a total link strength of 33,946. The color indicates the cluster in which the word is included. The size of the circle represents the number of publications in which each word appears. The approximation between the different points means a higher correlation, as well as between the clusters.
  • The first cluster (red color) contains 72 terms that falls under the philosophy and theory of architectural graphics. Those that are repeated the most are drawing, architect, shape, landscape, art, perspective, color, house, diagram, language, model, photography and sculpture.
  • The second cluster (green color) is made up of 67 terms concerning the theory of geometry in architectural heritage. The most repeated terms are vault, survey, map, church, tower, wall, surface, photogrammetry, history, wall, conservation, dome, layout, historical heritage, cathedral, cartography, proportion, arch and GIS.
  • The third cluster (blue) includes 44 terms on the application of digital graphics in architecture education. Among those that stand out are technology, student, proposal, user, education, motivation, evaluation, visualization, motivation, augmented reality, mobile device, teaching, satisfaction, 3D model, virtual model and virtual reality.
  • The fourth cluster (yellow color) includes 34 terms that comprise urban design management, and the most repeated terms are frame of reference, management, intervention, housing, simulation, interaction, workshop, planning, organization, energy, behavior, urban space and urban planning.
In addition, Table 7 provides numerical information on the five concepts with the most weight in each category, including direct links, total link strength and the number of times they appear in the search (occurrence).
Co-occurrence model 5 (see Figure 8): 638 terms meet this limit, of which 60% of the most relevant terms is 383. A model structured in seven clusters was obtained with 10,289 links and a total link strength of 36,168.
  • The first cluster (red color) contains 102 terms that fall under the philosophy and theory of architectural graphics, among which the following are repeated the most: architect, form, art, life, landscape, culture, sketch, painting, drawing, architecture, thought, diagram, color, abstraction, aesthetics, ideation, mind, analogy and graphic expression.
  • The second cluster (green color) consists of 72 terms on the application of digital graphics in architecture education. The most repeated terms are technology, student, evaluation, education, visualization, usability, device, augmented reality, virtual model, satisfaction, mobile device, urban space, virtual reality, communication, gamification, motivation, spatial skills, video game engine and 3D technology.
  • The third cluster (blue) includes 70 terms on the theory of geometry applied to the study of architectural heritage. The following words stand out: view, perspective, vault, design, cathedral, restoration, photography, arch, dome, proportion, rib, layout, stereotomy, descriptive geometry and geometric analysis. Theory of geometry applied to the study of architectural heritage.
  • The fourth cluster (yellow color) encompasses 37 terms that encompass research on urban models, among which the following are repeated the most: planning, urban development, color, urban landscape rehabilitation, property, city, identity, urban form, intervention model and historic city.
  • The fifth cluster (purple color) incorporates 37 terms on digital graphic techniques for the study of architectural heritage: conservation, monument, photogrammetry, permanence, architectural heritage, tower, comparative analysis, recovery, traces, laser scan, HBIM, point clouds and graphic information.
  • The sixth cluster (cyan color) is made up of 36 words are combined on the analysis of territory information: territory, cultural heritage, decision, database, demand, cartography, identification, energy, diagnosis, memory, infrastructure, GIS and infrastructure energetic.
  • The seventh cluster (orange color) includes 29 terms on the graph of population behaviors: integration, communication, interaction, simulation, modeling, theory, population, service, behavior, social organization, urban ecosystem and management processes.
Testing different levels of co-occurrence provided variations that allow for identifying research fields in architectural graphics. Besides, the visual information on the network map provides valuable information on how the topics complement each other. This information is supported in Table 8 with numerical information on the five concepts with the most weight in each category.

4.2. Cluster and Network Map Analyses: Co-Ocurrence Fields—Keywords

The written information corresponds to the keywords of the publications (see Figure 9)—a total of 2346 terms. The minimum value of co-occurrence of the terms between 2 and 5 was experimented with due to the low number of manuscripts. A co-occurrence model five is proposed with 110 terms that meets this limit. A structured model is obtained in four clusters with 10,289 links and a total link strength of 36,168.
  • The first cluster (red color) contains 36 terms that are framed in fundamental elements of architectural graphics, such as architecture, survey, geometry, architectural representation, drawing, landscape, stereotomy, design, color, city, perspective, art, sketch, photography, mockup and diagram.
  • The second cluster (green color) consists of 31 terms on digital graphic techniques; among the most repeated are cultural heritage, photogrammetry, computer-aided design, architectural design, maps, laser scanner, historical preservation, representation, cartography, GIS, HBIM, BIM, archeology, sustainable development and restoration.
  • The third cluster (color blue) includes 23 terms on interactive architecture education tools: education, students, virtual reality, mobile devices, gamification, human-computer interaction, academic performance, architecture education and virtual models.
  • The fourth cluster (yellow color) includes 16 terms on innovative visual methods to communicate architecture: three-dimensional computer graphics, augmented reality, visualization, user experience, three-dimensional model, motivation, interactive visualization and satisfaction.
Table 9 incorporate numerical information regarding the weight of those concepts with more importance in terms of weight for each category.

5. Discussion and Conclusions

Graphic representation requests research references that provide practical applications for drawing professors and researchers. In addition, it is essential to disseminate findings to contribute to the generation of widely proven theories. This is even more important when previous research showed low scientific production in graphic areas [99].
Thus, the scope of literature has included both engineering and architectural graphics in order to combine their knowledge. It has been categorized into six research fields based on international conferences organized in Spain: techniques and theories of graphic analysis, innovation and creation, design and manufacturing, education, heritage and history and analysis of the territory.
The paper has focused on architectural graphics. The cluster analysis on the publications indexed in Scopus has revealed that the research is divided into four areas: the philosophy and theory of architectural graphics, the theory of geometry in architectural heritage, the application of digital graphics in architecture education and urban design management. This result has been verified using two map network models (8 co-occurrences of titles and abstract and 5 co-occurrences of keywords) and has been supported by a third model with a lower limit value in order to deepen our understanding of subcategories, which has evidenced the inter-relation of graphic techniques among topics. In addition, the keyword model has complemented the previous findings as it provides a grouping into four types of graphic methods: fundamental elements of architectural graphics, digital graphics techniques, interactive architecture education tools and innovative visual methods to communicate architecture.
This fact shows a variance of research topics among those proposed by congresses and those published in papers, which proves the existence of gaps in architectural graphics research. This framework of disconnection among sources of knowledge is still a major problem that may be related to the professional load of architecture practice and, consequently, a low scientific production [5].
Regarding topics, the predominance of an architecture research field concerning its artistic nature has been confirmed, in which the most repeated concepts are art, form, idea or drawing. Meanwhile, digital manufacturing is one of the graphic analysis research fields that architects are not exploring and that could be used to manufacture high-detail models [49], to produce ephemeral elements [52] or to develop mechanical prototypes.
Academics and professionals are encouraged to add a global term such as architectural graphics in addition to stating their specific keywords when publishing their research results and not to repeat terms that already appear in the title or abstract.

Author Contributions

Conceptualization, V.L.-C., A.A.L.; Data curation, V.L.-C.; Formal analysis, V.L.-C.; Investigation, V.L.-C., A.A.L.; Methodology, V.L.-C., A.A.L.; Software, V.L.-C.; Supervision, A.A.L.; Visualization, V.L.-C.; Writing—original draft, V.L.-C.; Writing—review & editing, V.L.-C., A.A.L. All authors have read and agreed to the published version of the manuscript.

Funding

This research received no external funding.

Acknowledgments

This project had its beginning under the supervision of Manuel and Fernando Aguilar, full professors of engineering graphics, whom we thank for their effort to promote quality research in the area of knowledge.

Conflicts of Interest

The authors declare no conflict of interest.

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Figure 1. Research field 02 examples: (a) possibilities of freehand drawing on digital tablets. Amado, Antonio, Brujas, 2013. Source: [34]; (b) result of color analysis of all Salubra color pairs. Source: [33].
Figure 1. Research field 02 examples: (a) possibilities of freehand drawing on digital tablets. Amado, Antonio, Brujas, 2013. Source: [34]; (b) result of color analysis of all Salubra color pairs. Source: [33].
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Figure 2. Research field 02 examples: (a) survey of the stonework traces of the church Santa Clara de Santiago. Source: [42]; (b) alternative graphic procedure for the geometric layout of a medieval gothic church of the mendicant order. Source: [40]. (c) Plans of the Spanish vaults by computer-aided design (CAD) overlay on orthophotograph. Source: [39].
Figure 2. Research field 02 examples: (a) survey of the stonework traces of the church Santa Clara de Santiago. Source: [42]; (b) alternative graphic procedure for the geometric layout of a medieval gothic church of the mendicant order. Source: [40]. (c) Plans of the Spanish vaults by computer-aided design (CAD) overlay on orthophotograph. Source: [39].
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Figure 3. Research field 03 examples: (a) final result of SO/PHI high-detail model Source: [49]; (b) connector and printed piece of Subassembly 8. Source: [49].
Figure 3. Research field 03 examples: (a) final result of SO/PHI high-detail model Source: [49]; (b) connector and printed piece of Subassembly 8. Source: [49].
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Figure 4. Research field 04 examples: (a) digital sketch example—professors used this method to show the phases of an architectural drawing with annotations. Source: [68]. (b) Students observe a construction process with augmented reality. Source: [66].
Figure 4. Research field 04 examples: (a) digital sketch example—professors used this method to show the phases of an architectural drawing with annotations. Source: [68]. (b) Students observe a construction process with augmented reality. Source: [66].
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Figure 5. Research field 05 examples: (a) Workspace indicating the historical reference points used. Source: [69]. (b) Superposition of the elevation on the result of the alignment of the main parts of a frame. Source: [73]. (c) Aerial view of the 3D textured model of the area surrounding la Botica. Source: [74].
Figure 5. Research field 05 examples: (a) Workspace indicating the historical reference points used. Source: [69]. (b) Superposition of the elevation on the result of the alignment of the main parts of a frame. Source: [73]. (c) Aerial view of the 3D textured model of the area surrounding la Botica. Source: [74].
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Figure 6. Research field 06 examples: (a) carillon signage analysis. Source: [92]. (b) Location of geo-located images around the case study. Source: [93]. (c) Graphic model in which the node is proportional to the number of activities carried out by professionals. Source: [85].
Figure 6. Research field 06 examples: (a) carillon signage analysis. Source: [92]. (b) Location of geo-located images around the case study. Source: [93]. (c) Graphic model in which the node is proportional to the number of activities carried out by professionals. Source: [85].
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Figure 7. Title and abstract network map of Scopus papers of architectural graphics professors. Minimum level of co-occurrence of eight. Result: four clusters.
Figure 7. Title and abstract network map of Scopus papers of architectural graphics professors. Minimum level of co-occurrence of eight. Result: four clusters.
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Figure 8. Title and abstract network map of Scopus papers of architectural graphics professors. Minimum level of co-occurrence of five. Result: seven clusters.
Figure 8. Title and abstract network map of Scopus papers of architectural graphics professors. Minimum level of co-occurrence of five. Result: seven clusters.
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Figure 9. Keywords network map of Scopus papers of architectural graphics professors. Minimum level of co-occurrence of five. Result: four clusters.
Figure 9. Keywords network map of Scopus papers of architectural graphics professors. Minimum level of co-occurrence of five. Result: four clusters.
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Table
Table 1. Research field 01: Techniques and theories of graphic analysis.
Table 1. Research field 01: Techniques and theories of graphic analysis.
ConferenceResearch Topics
EGATheories, principles and masters; graphic representation; graphic analysis; geometry and projection; scale models, models and prototypes
APEGAICT applications; architectural drawing; graphical analysis of the building; virtual and augmented reality; BIM technology
INGEGRAFVirtual approaches to interactive design; virtual design based on the prototype; CAD, CAE, IFC and BIM; image processing and analysis; geometric modeling and analysis; reverse engineering; virtual and augmented reality; building information modeling; photogrammetry and remote sensing
Table
Table 2. Research field 02: Innovation and creation.
Table 2. Research field 02: Innovation and creation.
ConferencesTopics
EGABuilt and unbuilt graphic concepts; graphic concepts of heritage; artistic creations; phenomenology, perception and interaction; shape grammar
INGEGRAFCreativity and innovation methods; collaborative engineering; management of intellectual and industrial property; design and research methods
Table
Table 3. Research field 03: Design and manufacturing.
Table 3. Research field 03: Design and manufacturing.
ConferenceTopics
APEGAInterior design, technological design and industry; parametric design and digital fabrication
INGEGRAFGreen engineering and eco-design; user-centered design; design based on the product life cycle; robust design, reliability and maintenance; simulation-based modeling and design; ergonomics and human factors; global product development; integrated/advanced manufacturing; manufacturing process and production management; rapid prototyping; additive manufacturing; flexible assemblies; remanufacturing; Industry 4.0
Table
Table 4. Research field 04: Education.
Table 4. Research field 04: Education.
ConferenceTopics
EGATheories and didactic models applied to architectural graphic expression; formal and informal learning; new media and contexts; interdisciplinary collaborations and contributions; teaching the graphic representation of architectural heritage
APEGATeaching innovation
INGEGRAFTeaching of graphic expression; theoretical and applied geometry; graphic design; new approaches in teaching–learning processes; project-based learning; interactive 3D modeling
Table
Table 5. Research field 05: Heritage and history.
Table 5. Research field 05: Heritage and history.
ConferenceTopics
EGADocumentation and graphic restitution; low-tech/high-tech interactions between tradition and innovation; analysis techniques; reconstruct and show what is no longer there; virtual and augmented reality to communicate and interpret the present, the past and the future; architectural heritage survey
APEGADrawing in the history of construction
INGEGRAFVirtual environments; augmented reality in architecture, engineering and construction heritage and territory; conservation of industrial heritage
Table
Table 6. Research field 06: Analysis of the territory.
Table 6. Research field 06: Analysis of the territory.
ConferenceTopics
EGAHistorical and historiographic cartographies; new cartographies (Space Syntax, GIS, BIG DATA, analytical, perceptual, subjective cartographies, etc.); landscape representation (urban landscape, storytelling, urban sketching, etc.)
APEGATopography and cartography; remote sensing and GIS; technical projects; visual communication and smart city
INGEGRAFSustainable building; sustainable construction; geoinformation; data capture; urban regeneration
Table
Table 7. Results of weight in the structure of title and abstract co-occurrence eight.
Table 7. Results of weight in the structure of title and abstract co-occurrence eight.
ClusterLabelWeight
(Links)		Weight
(Total Link Strength)		Weight (Occurrences)
1drawing1792089234
architect1701238121
form15385972
art11780359
landscape12465259
2vault105100389
century15993990
survey15286266
view15376460
map9757953
3technology1542126143
student1232115140
case study12785356
proposal16084671
user9376854
4framework13675952
integration11447430
communication8938628
intervention9937034
management8934934
Table
Table 8. Results of weight in the structure of title and abstract co-occurrence five.
Table 8. Results of weight in the structure of title and abstract co-occurrence five.
ClusterLabelWeight
(Links)		Weight
(Total Link Strength)		Weight (Occurrences)
1architect2321397121
art15499959
form20291675
landscape15063150
idea14659540
2student1682171140
technology1921953128
case study17186056
user11177154
evaluation13168547
3view19379260
vault10777983
perspective14455156
cathedral8431324
collection12431325
4color6957052
influence11537033
criterium7727725
planning9524416
position7222914
5tower5242440
conservation9036731
monument8932528
palace7226527
photogrammetry8122726
6territory10734631
cultural heritage10333826
housing5433131
decision7619811
cartography6817419
7integration13653930
agent7046722
interaction9942325
communication10139028
simulation8637025
Table
Table 9. Results of weight in the structure of keywords co-occurrence of five.
Table 9. Results of weight in the structure of keywords co-occurrence of five.
ClusterLabelWeight
<Links>		Weight
<Total Link Strength>		Weight <Occurrences>
1architecture9230789
surveys436611
geometry223518
architectural representation213113
drawing163141
2cultural heritage4510323
photogrammetry397019
maps265110
architectural design274322
historic preservation23437
3students4627234
education5121728
virtual reality4313722
education computing3911913
e-learning3711415
4augmented reality4821835
three dimensional computer graphics5514621
visualization4514019
user experience3811717
motivation289410
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López-Chao, V.; Amado Lorenzo, A. Architectural Graphics Research: Topics and Trends through Cluster and Map Network Analyses. Symmetry 2020, 12, 1936. https://doi.org/10.3390/sym12121936

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López-Chao V, Amado Lorenzo A. Architectural Graphics Research: Topics and Trends through Cluster and Map Network Analyses. Symmetry. 2020; 12(12):1936. https://doi.org/10.3390/sym12121936

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López-Chao, Vicente, and Antonio Amado Lorenzo. 2020. "Architectural Graphics Research: Topics and Trends through Cluster and Map Network Analyses" Symmetry 12, no. 12: 1936. https://doi.org/10.3390/sym12121936

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