The Interplay of Objectivity and Subjectivity in Landscape Character Assessment: Qualitative and Quantitative Approaches and Challenges

Landscape character assessment (LCA) methods have been used in the past few decades to analyze, classify, and map landscape types, using objective and subjective approaches, with the aid of both quantitative and qualitative data. This paper addresses and critically evaluates the compromises and ways in which contemporary LCA methodologies employ (or profess they employ) objective versus subjective and quantitative versus qualitative data and analytical tools, in their conceptualization and implementation. It begins with an extensive literature review of the ways in which the objective/subjective and the quantitative/qualitative variables interweave in currently practiced or proposed versions of LCA. With the aid of meta-analysis, the paper traces and discusses the recent evolution, methods, concessions, and risks of such endeavors, and develops an integrative conceptual model for critical assessment, analysis, and negotiation of the interplay between objectivesubjective and quantitative-qualitative constituent parts of existing LCA methodologies. It concludes by pointing to pitfalls and prospects, in the broader attempt towards a more concerted, integrative approach to LCA development and practice, both appropriate to its challenges and adaptable to time-space-culture-discipline landscape particularities and means of implementation.


Introduction and Study Context
The European Landscape Convention (ELC) [1] promotes the protection, management, and planning of all landscapes; it has long been considered as our best landscape stewardship tool, at least as concerns European landscapes. One of the major principles on which ELC measures are based is the identification of landscape character, as well as the pressures and drivers of change, as regards the implementation of strategies for landscape management, planning, and protection. Such principles and strategies require a systematic knowledge of their variation, spanning the full range of spatial scales that define the landscape level, i.e., in landscape typologies. Although it is widely acknowledged that there is a lot of potential for promoting holistic landscape study and sustainability by using the guiding principles of the ELC [2], important inroads remain to be made in its practical application in landscape stewardship [3], very much due to difficulties in contextualizing landscape assessment/characterization/mapping.
Landscape character assessment (LCA), once seen as central to the implementation of the ELC [4], is now in a process of regrouping, reconsideration, and renewal, at least as concerns peripheral regions in/of Europe, trying to "catch up" with Northern and Western European regions [5][6][7]. As a process, LCA is mostly concerned with documenting landscape character and, as such, it is divided into two main phases. The first phase, landscape characterization, concentrates on what makes one area different from another, by identifying, classifying, and mapping areas of distinctive character, and results in the drafting of landscape character types and areas. In the second phase, judgements are imparted about landscape character, leading to decisions concerning the management, planning, and protection of the various landscape types/areas. Landscape character assessment thus provides an important strategic overview, on the basis of which policies are developed towards landscape multifunctionality and resolution of conflicting demands between agriculture, development, recreation, and nature conservation. Therefore, LCA is a useful tool for a variety of different sectors related to landscape planning and management, as well as for "the implementation of landscape policies, especially the integration of landscape objectives into territorial strategies, with the active cooperation and participation of all the social agents affecting a territory" [8], as regards both environmental and societal goals.
As a broadly acknowledged and established method of landscape assessment, characterization, and mapping, with the aid of both quantitative and qualitative data, LCA combines both subjectivity and objectivity-and has been practiced and employed this way in a variety of cases. As a process of characterization, it must be objective, while, as a tool informing decisions, it must lead to judgements involving an element of subjectivity. Furthermore, the LCA method relies on data of both a quantitative and qualitative nature, at least owing to the fact that the landscape, by definition, is constituted in a relational way, through human perception and interaction [1,9]. It is also broadly acknowledged that subjective judgements are involved in all decision phases concerning landscape character assessment, from surveying landscape elements to mapping and describing landscape types.
However, there is a lack of research on a critical assessment of this twofold perspective (subjective vs. objective, in conjunction with qualitative vs. quantitative) to LCA and mostly a review of relevant research capturing this aspect. This is precisely the goal of this study; namely, to review the most recent research spanning the time period of the past 20 years, addressing the problem of subjectivity and objectivity in LCA methods, and to critically assess issues of applicability and value of this method, with a view to its future uses. This paper thus addresses and critically evaluates the compromises and ways in which contemporary landscape character assessment (LCA) methodologies employ (or profess they employ) objective vs. subjective and quantitative vs. qualitative data and analytical tools in their conceptualization and implementation. This endeavor is undertaken in the context of recent attempts to shift through various pitfalls and prospects, towards a more concerted, integrative approach to LCA development and practice, both appropriate to its challenges and adaptable to time-space-culture-discipline landscape particularities and means of implementation. The importance of the study lies in its attempt to provide a framework for more integrative and balanced, but also critical and flexible, implementation of the LCA in landscape planning, management, research, and education.

Basic Constituent Elements of LCA and LCA Practices in Europe
Landscape character assessment is a set of techniques and procedures and a recognized tool for the classification and description of landscape, also used to understand the evolution of its physical and cultural characteristics [5,10]. Many variations of LCA are used across Europe, due to different policies, their interactions with stakeholders, their links to efforts towards the development of landscape indicators, and the various scientific and technical bases of data collection. Groom et al. define landscape character as "distinct and consistent patterns of elements in the landscape" and LCA as "a set of tools that are scientifically sound, region-specific and stakeholder orientated, designed to describe landscape character . . . a process concerned primarily with documenting landscape character rather than assigning quality or value" [11]. Briefly, LCA as a method combines "subjectivity and objectivity and as a process of characterization is objective, while making judgements to inform decisions involve an element to subjectivity" [12]. Therein lies the challenge of the LCA, how to combine best the employment of both quantitative and qualitative data towards these goals.
LCA has a long history in Europe, with the most representative examples of such work in NW European countries [13]. In very recent years, significant progress has also been made in the Southern European/Mediterranean region, regarding the description and mapping of landscape types [5][6][7]14,15]. At the same time, augmenting policy, and management needs for more detailed and accurate landscape typologies, at least at the European level, have led to efforts towards standardizing LCA. The latter typologies aim to reduce uncertainty and subjectivity in assessing and characterizing landscape, to curb personal judgement and to produce indicators/tools of both quantitative and qualitative data analysis, in an effort to arrive at a holistic and combinational approach to landscape characterization. In this context, a series of landscape indicators have been developed that describe, evaluate, and communicate relevant aspects such as the state of landscapes, their evolution, the landscape policies implemented by public institutions, citizen involvement in landscape matters, or the degree of awareness and enjoyment of the landscape by the population, but also visual landscape quality and experiential, perceptual, or value-based landscape aspects [16][17][18][19][20][21][22][23]. Several countries "have chosen a rather proactive approach towards the implementation of indicator-based landscape assessment and have developed methodologies in terms of spatial resolution and policy orientation, resulting in impressive monitoring and reporting products at the national level. Meanwhile, geographic information systems (GIS) and remote sensing have given geographers and ecologists unique capacity to quantify land cover pattern and understand spatial heterogeneity and landscape structure" [24,25].
The purpose of landscape characterization [8] is to identify areas of distinct character, to classify and map them, and to describe their character and key characteristic features. To achieve this, identification of landscape types in the area is required. The latter are derived through a structured approach/method, based on the combination of physical (relief, geology, soils, habitats/vegetation) and cultural factors (land use and settlement) [6,26], which helps render these landscape descriptions professional and objective [26]. Recent inroads into new technologies, such as the Web and geographical information systems (GIS), have managed to render these landscape descriptions more readily transferrable into policy outcomes.
The landscape character assessment process includes three stages: (a) The desk study, (b) the fieldwork, and (c) the classification of landscape description units-LDUs-and amalgamation of landscape types. Landscape description units are distinct and relatively homogenous units of land, each defined by a series of definitive attributes (soil, geology, topography, land cover, settlement pattern) [13], The desk study is based on: (1) The review of relevant background reports, other qualitative and quantitative data, and mapped information, (2) the application of this information to the creation of a series of map overlays of landscape factors for the area of interest, based on primary data already collected by other national/international public bodies, and (3) the first draft definition of LDUs, which, most of the time, relies on the compilation of the above layers as produced with GIS. The fieldwork aims to: (1) Gain an overall impression of the visual character of the landscape, which relies on the subjective perception of the observer, (2) amend the boundaries of the mapped LDUs, as appropriate, either with the aid of GIS or by the subjective opinion of the researcher, (3) record (i.e., photograph) the landscape and its characteristic features, and (4) complete a field assessment sheet for each landscape unit, in situ, where, again, the judgements are mostly subjective. The classification of the LDUs and creation of landscape types includes: (1) The adjustment/correction of LDUs and their cartographic presentation, if needed, which, again, relies on the perception of the researcher, (2) the creation and mapping of landscape types, either manually or through GIS analysis/fieldwork observation/post-GIS analysis and interpretation methods and tools, and (3) the finalization of the description of the landscape types and their particular features.

The Challenge of Objective vs. Subjective and Quantitative vs. Qualitative in LCA
Nonetheless, top-down expert landscape analysis and interpretation are fraught with challenges potentially leading to overly subjective conclusions, whereas sole-or over-reliance on objective approaches runs the risk of glossing over diversity and of overgeneralization of spatial data and resulting landscape units. Another risk of measuring attributes from maps and analyzing the data solely quantitatively is to lose the sense of place, quintessential to landscape conceptualization and living in the landscape-not to mention perceptual, artistic/literary, experiential, and value-laden landscape aspects/elements. Quantitative methodologies using semantic rating scales and cluster analyses ( [27] and qualitative methodologies such as household surveys and public perception tools [28] have tended to be combined for better results. In addition, photograph validation comparing results of field and non-field responses has been used by several researchers [29][30][31] and contested by others [32][33][34]), on the basis of their use in isolation and emphasis on the visual component, in the context of the overall subjectivity involved in deciding the scale, boundaries, and content of the selected photographs. Quite often, policy implementation schemes are also based on experiential research using other qualitative methods, such as virtual individual decision maps comprising a final composite area map ( [35], or scenariobased studies where the public is presented with visual representations of possible future landscapes, with a more explicit policy focus [36,37]). The process of deciphering objective vs. subjective aspects of LCA and distinguishing between quantitative vs. qualitative data in proper LCA development and implementation therefore entails several risks and challenges, aptly laid out by Swanwick [10]: There has been long-standing debate about the role of objectivity and subjectivity in dealing with landscape. The search for supposedly objective approaches has reflected a desire, in some quarters, to remove the element of personal judgement from the process . . . In Landscape Character Assessment it is accepted that there is a role for subjective inputs, but these must be made in a systematic and transparent way. The process of characterization should be an objective process in the main, while making judgements to inform decisions involves an element of subjectivity which can be clarified by using criteria agreed beforehand. The important thing is that everyone involved in the process, or in the use of an assessment, understands which elements of it are relatively objective and unlikely to be disputed, and which ones are more likely to be viewed differently by different stakeholders. There is also scope for a wide range of stakeholders to contribute to characterization, each contributing their own judgements about variations in character.
Therefore, and as a general rule, as a tool primarily aimed towards landscape identification/categorization and mapping, LCA relies foremost on quantitative data, which are omnipresent and ubiquitous in any type or form of LCA. Normally, quantitative data already exist as primary data available for LCA implementation, as they serve a broad variety of societal functions and uses (environmental, ecological, planning, etc.), for purposes of compliance with policy and directives, at least at the EU level. Furthermore, qualitative data are an integral part of LCA, stemming from the landscape definition and conceptualization itself, and are necessary, as already indicated above, in describing the "character" of a landscape. Further, as a tool, LCA requires a multidisciplinary team of experts for its operationalization and implementation. Another problem in bigger-scale projects is the accuracy of boundaries among the LDUs as well as of the cartographical data. Qualitativeness is thus employed in various forms of LCA, and specifically as landscape elements, functions, dimensions or methodologies used to "measure" LDUs complement the quantitative aspects of LCA, i.e., the historic and built environment, and some matters of perception such as the sense of enclosure, tranquility, or remoteness. Such examples of qualitativeness are landscape indicators of visual qualities [19,20] based on frameworks stemming from aesthetic theory, for purposes of visual landscape quality and character assessment [21,22], or the Catalonian landscape catalogues, which aim at integrating natural and cultural values in their tangible and intangible dimensions [38]. However, the latter authors also caution that: Landscape is, to a great degree, concerned with experience, that is to say, it is formed from the sum of experiences lived through over the years, with deep-rooted feelings of belonging and identity. The ancestral social and economic relationship established between the various populations of a territory, or between a village and a nearby river, the use of certain techniques and practices in dealing with crops, the names of places, the existence of a dialect spoken in a little area and the special recognition of certain landscapes (through their importance during childhood or through their daily use) are, among others, some of the factors-now intangible-which identify us with a particular landscape.
These aspects of subjectivity, then, ought to be combined with more objective data, in LCA formulation and implementation, and they also ought to encompass collective humanlandscape interrelationships, not just personal assessments. For instance, the "feeling of a place/landscape" is not enough. "For the identification of the more cultural, perceptive, and interpretative values (such as the aesthetic, symbolic and spiritual) and, therefore, more subjective in evaluation, it is very important to know the opinions of the people who live in a territory, through enquiries both general and directed to informed people" [38]. Such subjective data come into play, in various ways, in LCA methodologies, starting with the selection of the best fit LCA version (i.e., degree of interdisciplinarity, reliance on other information beyond the method itself or not, etc.), coupled with the datasets to be utilized (i.e., GIS, statistical/numerical, tangible and intangible). Subjective decisions run the spectrum of the justification of the specific LCA method, of its adjustment to the timespace-society particulars of the context of its implementation, of the acknowledgement of its delimitations, of case study and survey site selection, of field-study strategy and site reconnaissance, of synthesizing all the data into landscape units and character types, of naming them, and, last but not least, of the ways of involving all relevant stakeholders, including locals and expert informers in the whole process (i.e., landscape and community acquaintance, planning, deliberating, reporting, decision-making, implementation). LCA methodologies may also "differ substantially depending on traditions of geographical and landscape research, the practical purpose of the mapping and landscape characteristics of the country" [6,39], as well as the needs of landscape planning and management and respective community priorities.

Research Design
Based on a broad literature review of the ways in which the objective/subjective and the quantitative/qualitative variables ("our 2-variable scheme") interweave in currently practiced or proposed versions of LCA, this paper employs the method of meta-analysis, to examine the fit of these 2 variables into the co-creation of LCA. Our main research question was, "How do LCA methodologies negotiate the interplay between objective and subjective landscape dimensions, with the aid of quantitative vs. qualitative approaches and data?" After an extensive theoretical overview of pertinent literature over the past 20 years, we created our database format and proceeded to the meta-analysis of these bibliographical sources, with the aid of our 2-variable scheme model of LCA classification. Specifically, the meta-analysis focused on a critical assessment of the recent evolution, methods, concessions, and risks of such endeavors, and aimed at charting them on an integrative conceptual model, developed for the purpose of analyzing the interplay between objectivesubjective and quantitative-qualitative constituent parts of existing LCA methodologies. We concluded with the interpretation of results, based on the position our bibliographical sources took on our 2-way 2-variable scheme and a discussion of issues of applicability and contribution of this model to LCA analysis, in light of the study's findings/results.
Our literature search comprised all references that we located, relevant to LCA methodologies in theory or practice and to landscape assessment/characterization/mapping methods, more generally, provided they were available in digital form and written or translated into English. The meta-data of our database comprised 46 scientific sources (Table 1), namely articles, book chapters, books, or research project reports, which were selected from a much larger pool of sources, as best fitting our search criteria. The criteria of inclusion in the database were any combination of the following: (1) Expression of dilemmas, barriers, and debates vis-a-vis LCA-related subjective-objective or qualitative-quantitative aspects, (2) review/presentation of case studies of implementation of LCA methods and tools in Europe and elsewhere, and (3) LCA application in landscape management, including employment of any of the levels of measurement of the 2 variables. All such sources pertaining to LCA since roughly 2000 were included in the study and analyzed for the following: (a) Employment of qualitative/quantitative data and subjective/objective methods and tools, (b) explicit or implicit analysis and/or discussion of the weight placed on the above data and methods/tools, as well as on their interrelationships, and (c) rating of the sources according to our 2-variable scheme. A great example of an effort to interweave all aspects of our 2-variable scheme in a tight, systematic, and multilayered approach to LCA

ESPON (2015) [44]
The analysis here is on the contribution of landscape to liveability. The outcomes are criteria for successfully integrating landscape planning and management into spatial planning.

Wascher
Wascher ( The biggest challenge remains finding methods that facilitate at various scales the integration into HLC or LCA of public, non-expert views of landscape.

Stenseke
Stenseke (2016) [56] Interesting issue of temporality in the three case study areas UK, France, Sweden

Dalglish
Dalglish & Leslie (2016) [57] The landscape character concept is a significant one because it can help us to translate the principle of sustainable development into action in particular localities

Primdahl
Primdahl & Kristensen (2016) [58] Landscape character assessments playing a central role in this process of identification Denmark

Butler1
Butler (2016) [59] It argues about the significance of the assessment document for planning UK, Peak District The arguments for the rewilding of the Lake District resemble Linné's notion of nature's economy as a form of a self-regulating and purposeful (i.e., teleological) service-providing eco(nomic) and bureaucratic managerial system UK, Lake District

Van Eetvelde Van Eetvelde & Antrop (2009) [61]
The method presented is a combination of the parametric and holistic methods used Belgium Aretano Aretano et al. (2013) [62] In this study, results of landscape change detection are compared in terms of ecosystem service flow (objective assessment) with the investigation on people's perception (subjective assessment)

Guo
Guo & Zhang (2017) [63] GIS, Gower's similarity coefficient, and the AP algorithm were used to identify landscape character types at two levels for transregional integration in the multi-ethnic area of Wuling Mountain

Jellema et al. (2009) [64]
This is basically a methodology based on the spatial analysis tool for LCA. It introduces objectivity but the paper does not refer to objectivity or subjectivity of LCA This chapter describes the landscape character mapping and assessment process which was initiated in 2012 in Zanzibar, for the islands of Unguja and Pemba

Palmer
Palmer and Smardon (2018) [79] The research has considered the US federal approach to landscape character assessment USA Metadata is the technical term for "data about data", used to describe the summary information or characteristics of a dataset, while meta-analysis is the research method that combines the results of several related studies to produce better results [29]. More specifically, our meta-database structure consisted of the following information: 1. Bibliographical source, 2. website, 3. reviewer, 4. reference to our 2-vatiable scheme, 5. reference description, 6. interrelations between the 2 variables, 7. case studies/scale, 8. other/general comments, 9. measurement on the objective-subjective scale, and 10. measurement on the quantitative-qualitative scale.
Following the measurement of objective vs. subjective and quantitative vs. qualitative aspects (our 2-variable scheme) (Figure 1, Table 2) of our 46 LCA sources on a 5-pt scale, we placed these studies/sources on a conceptual model created to illustrate the degree of/and relationships between our two variables. The conceptual model of the axes of the 2-variable scheme that we developed included 5 × 5 = 25 possible locations, divided into two dimensions. Each source was categorized simultaneously as regards both its objective/subjective dimension as well as its qualitative/quantitative dimension. Limits between possible "locations" in this two-dimensional conceptual space were based on the authors' scientific experience in this area of study, as shown in Table 2. The 5 intervals (on both axes) were selected as an ideal small-scale categorization, with a distinct neutral category (category 3 out of 5) and two additional categories on each side (1,2) and (4,5).  The meta-analysis of the 46 articles was conducted by the three authors as shown in the following tables (Tables 3-5). This approach offers a degree of diversity in approaching and conceptualizing landscape-related literature. All three authors (experts) have been involved in landscape-related research in the past. Authors 1 and 2 have more general landscapeoriented scientific profiles, while author 3 has a more quantitative landscape-oriented research profile. Tables 3-5 depict the results of the categorization of our 46 landscaperelated sources by author. There exists a clear similarity in these results between authors 1 and 2, while author 3 shows a somewhat different perspective of the reviewed sources. The sources were allocated randomly to the three authors; the chronological distribution of the sources by author is depicted in Figure 2. Based on Figure 2, the chronological distribution of sources by author is balanced and is a result of this random allocation.    In our effort to demonstrate visually the distribution of all sources across the twodimensional "space" of objective/subjective and quantitative/qualitative, we developed the following illustration ( Figure 3). This is a two-dimensional abstract "space" with predefined locations (grey squares) of all 5 × 5 = 25 possible combinations of the above two scales. Sources were allocated to these predefined locations, forming a 2D distribution of points. We used "R" statistical programming language for the allocation of sources to this 2D abstract space. Furthermore, in the following Table 6, we present the frequencies of sources over the two scales [80].

Meta-Analysis and Discussion of Findings
Based on the above results, without considering the neutral categories of both axes, 16 papers seem to be located in the lower left part/quadrant of the graph, indicating an "objective" aspect and a "quantitative" approach ( Table 6). The upper left (quantitative and subjective) and upper right (qualitative and subjective) quadrants of the graph both include two papers. Finally, the lower right part of the graph (qualitative and objective) includes one single paper. The distribution of the 25 sources in the central row and column of the graph indicates their rather balanced approach of the LCA method around neutrality, in both dimensions. There seems to be a somewhat heavier balancing (a concentration) towards objectivity with quantitative approaches in the lower left part of the graph. These findings are in accordance also the results of our overview of the recent historical evolution of LCA research and practice, presented below.
The most striking finding of our meta-analysis was, thus, the high degree of concentration of our bibliographical sources at the bottom left and the central part of our conceptual model, indicating an almost clear linear relationship between our 2 axes, at least as far as the quantitative approaches tended to correlate with objective approaches. Such a conclusion is, of course, rather tentative and drawn with much caution, due to the small number of levels of measurement (5 each) of our two scales: (1) Very quantitative, (2) quantitative, (3) neutral, (4) qualitative, (5) very qualitative and (1) very objective, (2) objective, (3) neutral, (4) subjective, (5) very subjective. Nonetheless, these concentrations are very significant (Figure 4), and the rest of our bibliographical sources appear as outliers to this pattern, on the diagram of our model. Furthermore, several other issues came up, in the course of our meta-analysis, as follows. To begin with, deciphering the pertinent terminology may be a daunting task. Specifically, terms were often used by our sources indiscriminately, alternatively, or as synonyms, i.e., nominal or factual for qualitative; expert judgement, extrinsic, or interpretive for subjective; characterization, automated derivation, mechanistic-analytical, intrinsic, or value-free for objective. Other in-between terms that further complicated our analysis were: Interactive refinement; top-down vs. bottom-up. Other polarities included landscape facts vs. landscape values/sensitivity, etc., as well as biophysical vs. aesthetic/experiential/perceptual factors. We assessed these terms and polarities by harmonizing them with our 2-variable scheme, as/if appropriate, without comprising their integrity. Significantly, a chronological evolution of the weight of the two poles of our 2-variable scheme in LCA theory and practice emerged from our meta-analysis, as shown in Figure 4.
A clear historical progression towards more quantitative and objective approaches became apparent, although qualitative and subjective approaches have also remained significant to date, i.e., increasing emphasis on landscape physicality, but also on relationships and practices, as well as on land use and land cover, but also on economic and recreational landscape values [81]. Additionally, increasing emphasis has been being placed on public/stakeholder participatory methods (landscape justice, democracy, etc.). The following figures (Figures 5 and 6) depict the chronological distribution of our sources on the basis of the objective/subjective dimension, as well as the quantitative/qualitative dimension. Figure 5 indicates a rise in objective and very objective sources over the past 20 years, while Figure 6 shows a shift from neutral and qualitative approaches towards more quantitative approaches, during that same time period. These trends mainly indicate a higher and increasing number of studies using quantitative and objective LCA methods, as opposed to than qualitative and subjective approaches, which seem to remain rather stable in number. Neutral approaches appear to remain constantly significant over time.
However, the primary ever-present tension does not cease to exist, in the course of these two recent decades. On the one hand, stakeholder involvement is considered paramount in LCA, as it encourages ownership of the study and successful subsequent action on landscape issues. On the other hand, commonly agreed-upon approaches to landscape classification (i.e., LANMAP), especially when referring to cases of extensive areal coverage, seem to move away from a subjective, intuitive, and qualitative approach towards a more formal, objective, and quantitative standardized system [33].
A distinction emerged also as regards the predominance of different values of our 2variable scheme in LCA theory and practice, depending on the purpose/scope of the study: More qualitative and subjective approaches seem to have been used in applications to plan and landscape stewardship (i.e., sustainable development, environmental protection, risk assessment) vs. for theoretical/scientific purposes. One such example is LANMAP2, a new generation of landscape classification and mapping, demonstrating how traditional methods could be complemented by computer-driven methods, new techniques and European-wide datasets, for standardizing landscape classifications, in order to produce more comparable, more transparent, more reproducible, and to some degree more objective and accurate results [33].  Although scale was not one of our analytical variables, our study reaffirms that the issue of scale remains paramount and tightly linked to the LCA methodology, i.e., overlaying GIS data sets for landscape mapping guarantees objectivity at the national or supra-national scales, while, at the local scale, classification normally tends to be based on practitioner judgement-stakeholders may play an important part in the characterization process, at the latter scale.
Finally, the "cultural" emerges as a landscape dimension spanning all levels of measurement of our 2-variable scheme, i.e., from field, farm and settlement patterns, historical development, and heritage (qualitative, but objective factors) to more esoteric, experiential, and stakeholder input (qualitative, subjective factors). In addition, the "visual" factor similarly spans a broad range in our 2-variable scheme, i.e., MEDSCAPES LCA classifications [39] range from objective reporting of quantified landscape features to the recording of "the human perception of prominent visual characteristics and/or locally distinctive features" [40].

Concluding Thoughts
Although subjective and qualitative methods and tools remain steadily integral to LCA approaches, our meta-analysis findings point to the preponderance of the quantitative over the qualitative, and of the objective over the subjective, with fairly well distributed neutral-in terms of balance between the 2 poles of these 2 variables-cases of reference to LCA methods and tools. Not surprisingly, the meta-analysis also shows the connection between quantitative and objective aspects/approaches in the sources studied, as well as progressively more inclusive approaches to LCA, such as an increasing involvement of the public and relevant stakeholders in LCA processes. The latter is in line with ELC's advocating for public participation in landscape assessment processes and the formulation of landscape quality objectives [1]. The findings of our meta-analysis generally concur with and support other relevant research, i.e., "the use of focus groups has mushroomed in applied landscape research transferred into policy outcomes", although cautioning that such qualitative methodologies should not be used in isolation from quantitative ones [29].
Despite the fact that this was not an intention of our meta-analysis, the literature search for the creation of our database generally reaffirmed, once again, that landscape character assessment is a useful tool for a variety of different sectors related to landscape planning, policy management, regarding both environmental and societal initiatives. In this context, the need for more advanced and finely tuned, but also more user-friendly, objective and quantitative tools remains. However, for these such tools to be effective and efficient, they ought to be employed by experts trained in all of the above methods and tools (both objective/quantitative and subjective/qualitative), so that landscape assessment and analysis is not subject to strictly standardized forms of mapping processes. As summarized by Swanwick et al. [12]: [LCA] can be a powerful tool to aid the planning, design and management of landscapes. Use of GIS and methods of computer analysis should not, however, be at the expense of proper consideration of the perceptual and aesthetic factors which influence character. Nor should it distract from the need to engage stakeholders in meaningful ways. Judgements based on landscape character need to take account of several factors. Most importantly it is vital to decide who is going to be involved in making the judgements. For practical reasons some assessments may still rely mainly on judgements made by professionals. It is nevertheless important to involve stakeholders in this part of the process if the judgements are to command wide support and are to be as fully informed as possible [10].
One excellent example is the living landscapes approach [49], a strong case for the development and adoption of a commonly agreed-upon system of landscape assessment, structured in such a way that it is capable of accommodating the wide range of landscapes across Europe. This approach may serve as a complementary tool to the process of local spatial planning of small places and urban settlements. Such a system needs to be hierarchical, thus enabling users to select the appropriate level of detail and mapping scale for different applications and to incorporate data from a range of sources and formats. It should, ideally, provide a suitable spatial framework for the incorporation of additional data (i.e., ranging from evaluating indices of ecological quality and landscape sensitivity/capacity to enrichment with cultural information relating to public perception/appreciation/understanding of landscape character and evolution) [49].
Regarding the delimitations of our study, although scale is significant in the process of LCA implementation, we did not include it as an analytical variable in our study, since we only analyzed those sources available to us through our literature review, which revealed very different perspectives to scale. Furthermore, as far as delimitations are concerned, there exists a strong possibility of the following: Having inadvertently missed some related articles and especially those before 2000, not uploaded on research web pages; the judgement of selecting and grouping the sources was based on experts' subjective decision-making rather than objective/quantitative tools; and many sources were not published in English, and as such could not be incorporated in our literature review.
Despite an apparent evolution and refinement in recent scientific contributions, the potential for further future research in this area of study is very significant, i.e., in terms of the inclusion of more variables in such meta-analyses. Specifically, our database could be further expanded in scope and in size, to include all possible bibliographical sources referencing the LCA method, in all languages. Besides a more exhaustive list of references, a more stringent, analytical, and/or quantitative approach to the assessment of the interplay between our two variables may be effectuated, by larger researcher teams representing variable disciplinary orientations and research perspectives to LCA analysis and implementation. A more coherent, comprehensive, and agreed-upon LCA methodology and terminology, as well as appropriate LCA training among pertinent professionals, researchers, and decision-makers, are yet to be instigated, while policy makers tread uncertainly in this veritable minefield of operations [39,82].
We would like to conclude by emphasizing the inevitable obsolescence of any strict landscape classification scheme, due to the fluid, ever-changeable nature of landscape itself: Every landscape is both a tangible and intangible object, both permanent and ephemeral, existing simultaneously in human "realities" and aspirations [39]. Nonetheless, the challenge of integrating successfully and appropriately the two poles of our 2-variable scheme remains. Encouragingly, though, it seems that this task is increasingly and more and more creatively addressed and assumed by landscape-related scientists and practitioners, as this overview of LCA versions has aspired to show.