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An Integrated Method for Landscape Assessment: Application to Santiago de Cuba Bay, Cuba

: Human activities often drive landscape degradation and the associated loss of value. This paper describes a method that, by integrating multiple factors, characterize landscape value to establish relevant and effective management practices. The new integrated method for landscape assessment (IMLA) is a four-step model that includes: (i) establishment of a general theoretical basis for sustainability relevant metrics; (ii) characterization of the landscape; (iii) landscape valuation; (iv) recommendations for landscape value management. Each step includes different interactive components of analysis. The new IMLA considers the potential range of values associated with each landscape unit and facilitates sustainable landscape management. The method is systematic and includes both inductive and deductive reasoning. Its articulation is represented in the conjunction and overlapping of all factors and variables considered. IMLA was tested in Santiago de Cuba Bay (Cuba) and used to determine ﬁve landscape scopes, eight ﬁrst-order landscape units and 29 s-order units. It proved to be a useful tool to establish landscape values and sound management strategies. Application of IMLA in Cuba will help local authorities institute land-use plans and to establish decision-making processes that include valuation of cultural landscapes.


Introduction
An appropriate tool for the effective and sustainable management of landscape is required to preserve the beauty and functionality of natural areas [1]. This is a complex problem that must incorporate evolving ideas of how to value landscapes and landscape gaps (surrounding areas) in a way that encompasses a variety of stakeholder perspectives. These include visual, socio-cultural, natural and other attributes. Multiple methodologies to analyze landscapes exist and most of them use a territorial geoecological approach to delimitate landscape units, e.g., "Landscape Units" [2][3][4][5][6][7], "Homogeneous Units of Land" [8] "Ecological Units" [9] or "Environmental Units" [10,11].
Delimitation of landscape units primarily using physical-geographical criteria does not consider the value of scenic and cultural attributes [12][13][14][15]. Some authors propose methodological frameworks for the study of visual landscapes [4,10,12,14,[16][17][18] or for the (1) What kind of research is required to characterise and value landscapes for sustainable management? (2) What set of factors, variables and sub-variables must be considered to characterize and value landscape for management? (3) How can a method for characterizing and valuing landscapes be put into practice? (4) What results are generated from applying the Integrated Method for Landscape Assessment (IMLA) in a real-life scenario?

Methods
Three different methods were used in this study. The synthetic-analytic approach [46] developed a critical review to analyze and synthesize several theories, concepts and methodologies about landscape to disarticulate the different landscape components and to design factors and variables influencing landscape assessment. The systemic-structural method and the induction-deduction method [47] were used for the holistic and systematic interpretation of landscape, as well as for designing the new approach (IMLA) proposed in this paper. This included consideration of each of the different stages and variables influencing the landscape.

Design of the Set of Variables for Landscape Valuation
There is a vast range of landscape assessment and valuing methods that show similarities/differences. This paper identified the main similarities and differences among the different variables used herein in order to propose a set of metrics to consolidate the needed information (Table 1). We analyzed three kinds of factors to develop the IMLA: (1) Natural Factors: Environmental components on which human activities are based [3][4][5][6]20,21] (2) Cultural Factors: Socio-economic components of the existing culture responsible for using and transforming the corresponding environmental conditions for its own development [48][49][50][51][52][53][54][55]. (3) Scenic Factors: Visual components, which set the landscape apart and result from the relationship between natural and cultural components [13,14,56].
Those three factors constitute the most general parts of the system and the landscape's main elements are incorporated into it: nature, culture and scenery. The proposed variables constitute the system components representing the essential landscape characteristics of each factor ( Table 2). The new factors and variables selected were offered for discussion at three international workshops and at two professional committees. They were selected international and national experts representing different research fields, such as architects, urban planners, sociologists, geographers and historians. Each of such experts had more than 15 years of experience in his respective field of study, i.e., heritage, integrated management of coastal zones and resilient and sustainable cities. In one of them, international landscape experts from Spain, Canada, Brazil and Portugal provided their criteria and assessed the different levels of analysis to put the method into practice. In order to gain some perspectives on the organizational structure most appropriate to design IMLA a survey was proposed to gather in-depth information on attitudes regarding each of the factors and variables considered. In addition, the questionnaire online included some open-ended queries. The survey was structured in three sections, with information concerning: (1) respondents; (2) main variables for landscape characterization; (3) types of values associated with the landscape.
To define the sample size of the experts to interview we used Inferential Statistics [57]. This constitutes an excellent technique for determining a sample of experts in a previously established universe. A total of 90 experts from 15 provinces of Cuba formed the final sample for our analysis, i.e., 23 in Eastern Region; 30 in Central and 37 in Western Region. Cuban experts were consulted online. The reality observation technique [58] was applied during fieldwork and when identifying the different elements that influence and determine the specific landscaping characteristics of the visual gap from the study area (Santiago de Cuba Bay). Other studies helped identify the latest principal transformations in Santiago de Cuba Bay [59][60][61]. The Photo-Interpretation Technique of satellite images and 2020 Google Earth Software supported cartographic, topographic and toponymical regional bases at scales of 1:50,000, 1:25,000 and 1:10,000 [62]. The fieldwork was carried out between January and June 2020, always in the morning (8 am-12 pm).  Total

Study Area
Santiago de Cuba Bay, located in the south-eastern region of Cuba, represented an appropriate area to test the feasibility and relevance of IMLA ( Figure 1). The visual gap from Santiago de Cuba Bay comprises about 140 km 2 and is delimited by a mountainous system at the North, East and West and by the Caribbean Sea in the South. This geographical position creates a large, enclosed space, amphitheater-shaped, facing the sea, where the Bay is the central focus of attention [18,59].
Three important criteria pointed to selecting the Santiago de Cuba Bay to validate the method. First, this Bay is the second important in Cuba [59] and visual gap landscapes have distinctive environmental components due to the rough relief and irregular poly-lobed shape of the basin. Second, Santiago Bay offers a complex urban structure well adapted to its topographic configuration, shape and climate conditions. The integration of those three elements is the reason for the presence of multiple values in the landscape, albeit degraded or deteriorated [14,18]. Third, the real value of its landscape is currently unknown and, consequently, its qualities are inadequately managed [14,63]. Substantial increase in urbanization, as well as several changes in the coastal morphology for tourism and industrial development, engendered natural and cultural alterations in the landscape of urban spaces. This caused drastic and constant transformations of coastal zones; mangrove swamps, lagoons, beaches, cliffs and coastal dunes [60,64,65]. Therefore, IMLA would provide methodologies for integrated landscape characterization and valuation to improve effective and sustainable landscape value management.

New Integrated Method for Landscape Assessment (IMLA)
IMLA conceives landscape as a system composed of different interacting sub-systems. For further valuation, the landscape is divided into different parts and its intrinsic elements structured into smaller units of different hierarchical orders. Additionally, the method comprises four levels of analysis ( Figure 2) dialectically related to each other. For a better understanding, the whole process is organized and analyzed from its general aspects to the specifics.

New Integrated Method for Landscape Assessment (IMLA)
IMLA conceives landscape as a system composed of different interacting sub-systems. For further valuation, the landscape is divided into different parts and its intrinsic elements structured into smaller units of different hierarchical orders. Additionally, the method comprises four levels of analysis ( Figure 2) dialectically related to each other. For a better understanding, the whole process is organized and analyzed from its general aspects to the specifics.   The definition of the landscape to be characterized and assessed is carried out at Level 1, while Level 2 is structured into five different phases: Delimitation of the subject of study; (i) Analysis of the socio-historical landscape conditions; (ii) Landscape characterization according to natural, cultural and scenic factors; (iii) Determination of essential landscape features; (iv) Delimitation of landscape surroundings and corresponding units ( Figure 3). The definition of the landscape to be characterized and assessed is carried out at Level 1, while Level 2 is structured into five different phases: Delimitation of the subject of study; (i) Analysis of the socio-historical landscape conditions; (ii) Landscape characterization according to natural, cultural and scenic factors; (iii) Determination of essential landscape features; (iv) Delimitation of landscape surroundings and corresponding units ( Figure 3). In IMLA a Delimitation of the subject of study at Phase 1 is made following three different kind of criteria: (1) visual criteria [4,13,14,17,66]; (2) political-administrative criteria [5,6,20,21] and (3) individual-specific criteria [11,14], related to spaces specially identified by their historical, cultural or geographical circumstances [35,66]. In IMLA a Delimitation of the subject of study at Phase 1 is made following three different kind of criteria: (1) visual criteria [4,13,14,17,66]; (2) political-administrative criteria [5,6,20,21] and (3) individual-specific criteria [11,14], related to spaces specially identified by their historical, cultural or geographical circumstances [35,66].
For analyzing the historical-social conditions at Phase 2, the cultural landscape is regarded as the territory with traces of human activity caused by the anthropization processes. Special attention is given to landscapes where the level of transformations is generally very high because of the presence of urban, mining-industrial or touristic activities. Consequently, a historical-evolutive study about the landscape follows with the aim of defining the different stages or historical periods affecting the territory. At phase 3, the proposed system of factors, variables and sub-variables characterizes the landscape under study. The Sub-variables explained further on constitute the specific characteristics of every variable (Appendix A).
Five variables help to analyze scenic factors in the areas of landscape observation. The "shape" sub-variable refers to the landscape geometric form of the visual gap (Appendix B). The compactness of the landscape of visual gap indicates the non-visible or shadowy zones of the territory because of the existence of natural or anthropic obstacles. Compact landscape of visual gap means flat land, without obstacles, the content of the landscape completely visible. Hollow landscape of the visual gap refers to rough land, with a great number of visible obstacles (Appendix C). The landscape's scope is delimited according to the visual aspects influenced by the observer's position and area from the surveillance point, (Appendix D).
Phase 4 aims to determine essential landscape features considering those invariant qualities conferring identity to the landscape.
Phase 5 delimits landscape scopes and landscape units according to criteria outlined in Table 3. Table 3. Criteria to delimit landscape scopes and landscape units.

Orders of Landscape Units Criteria for Delimitation
Landscape scopes Homogeneous scenario in terms of space and visibility. • Visual, physical and spatial components, as well as the characteristics of the visual gap defined by the observer.

Units of First Order
• Natural factors considered primary factors of the original landscape shape. • Relief, hydrography, climate, vegetation and fauna.

Units of Second Order
• Cultural factors considered secondary factors that identify anthropogenic transformations of the territory. • Urbanization, element of major landscape impact. • Concentrated rural settlements, agricultural systems, mining and infrastructure facilities.

Level 3: Landscape Valuation
While characterization is an analytical-descriptive practice, valuation is a syntheticevaluative exercise. The types of values associated with landscape are defined in Level

Level 4: Landscape Value Management
The final aim of IMLA is to provide a basis for recommendations about preserving and protecting the landscape. Recommendations provide useful guidelines for actions and are formulated at a theoretical level. However, they can be used at a practical level in future projects for management and planning processes [14]. Additionally, recommendations are formulated at a general level regarding landscape, but at a specific for the landscape units that resulted from the valuation processes. The value categories of landscape units are the ones considered for IMLA.
Preservation and integral protection of landscape values are recommended for Category I units. Preservation with modifications that do not affect the landscape values are recommended for Category II units and modifications and/or adaptation for recuperation of landscape values are recommended for units in Category III. These recommendations provide a potential legal framework [67,68].

Level 4: Landscape Value Management
The final aim of IMLA is to provide a basis for recommendations about preserving and protecting the landscape. Recommendations provide useful guidelines for actions and are formulated at a theoretical level. However, they can be used at a practical level in future projects for management and planning processes [14]. Additionally, recommendations are formulated at a general level regarding landscape, but at a specific for the landscape units that resulted from the valuation processes. The value categories of landscape units are the ones considered for IMLA.
Preservation and integral protection of landscape values are recommended for Category I units. Preservation with modifications that do not affect the landscape values are recommended for Category II units and modifications and/or adaptation for recuperation of landscape values are recommended for units in Category III. These recommendations provide a potential legal framework [67,68].

Validation of the New IMLA at Santiago de Cuba Bay
We tested IMLA with an analysis of Santiago de Cuba Bay. The venue's historicalsocial conditions featured five evolutive stages during the anthropization process: (1) Prefoundation (before year 1515); (2) Formation of the urban nucleus (1515-1799) associated with the process of conquest and colonization during the "New World Discovery"; (3) Consolidation of the urban nucleus (1800-1898), when Santiago de Cuba was amalgamated as a city and presented predominantly natural landscapes; (4) Urban and rural expansion , when urban and rural activities transformed all landscapes of the visual gap; (5) Industrialization , linked to the industrialization of the visual gap environment, radically altering the landscape [14,18,60,69,70].
Landscape characterization revealed relief and vegetation as most representative of all the natural factors analyzed [14,61,71]. Birds were the most representative and important fauna, as well as the most visible animals in landscape. The Bay, with its water mirror, was the most attractive landscape component. Climate in that zone was also a stable component, with few variations and offering good visibility year-round.
Among all cultural factors for Santiago de Cuba urbanization has the greatest influence on landscape, due to the large surface it occupies [72,73]. Agricultural systems alter vegetation color and patterning, dependent on the various types of crops. Particulates and aerosols pollute the air, causing poor transparency and opacity [59,74,75]. Linear and punctual built infrastructures dominate the visage.
Only one mining facility is very visible, negatively affecting a small portion of the landscape. Concentrated rural settlements are small and rare.
Visual and spatial components are the most significant scenic factors due to great contrasts in colors, shapes, textures and lines of landscapes and the numerous human constructions. Physical components are important features of landscape scenes including anthropic activities, water features, vegetation and scenic background.
There were 29 potential observation points for the visual gap and 7 were selected as the most representative [14,18]. We choose three positions in the water body of the Bay: North, Center and South ( Figure 5). No positions were selected for the West since the zone is low, highly industrialized and difficult to access. The observer's position was analyzed for each point (Figures 6-8). In this case, the observer views the landscape from three different angles to note scenery and components.

Validation of the New IMLA at Santiago de Cuba Bay
We tested IMLA with an analysis of Santiago de Cuba Bay. The venue's historicalsocial conditions featured five evolutive stages during the anthropization process: (1) Prefoundation (before year 1515); (2) Formation of the urban nucleus (1515-1799) associated with the process of conquest and colonization during the "New World Discovery"; (3) Consolidation of the urban nucleus (1800-1898), when Santiago de Cuba was amalgamated as a city and presented predominantly natural landscapes; (4) Urban and rural expansion , when urban and rural activities transformed all landscapes of the visual gap; (5) Industrialization , linked to the industrialization of the visual gap environment, radically altering the landscape [14,18,60,69,70].
Landscape characterization revealed relief and vegetation as most representative of all the natural factors analyzed [14,61,71]. Birds were the most representative and important fauna, as well as the most visible animals in landscape. The Bay, with its water mirror, was the most attractive landscape component. Climate in that zone was also a stable component, with few variations and offering good visibility year-round.
Among all cultural factors for Santiago de Cuba urbanization has the greatest influence on landscape, due to the large surface it occupies [72,73]. Agricultural systems alter vegetation color and patterning, dependent on the various types of crops. Particulates and aerosols pollute the air, causing poor transparency and opacity [59,74,75]. Linear and punctual built infrastructures dominate the visage.
Only one mining facility is very visible, negatively affecting a small portion of the landscape. Concentrated rural settlements are small and rare.
Visual and spatial components are the most significant scenic factors due to great contrasts in colors, shapes, textures and lines of landscapes and the numerous human constructions. Physical components are important features of landscape scenes including anthropic activities, water features, vegetation and scenic background.
There were 29 potential observation points for the visual gap and 7 were selected as the most representative [14,18]. We choose three positions in the water body of the Bay: North, Center and South ( Figure 5). No positions were selected for the West since the zone is low, highly industrialized and difficult to access. The observer's position was analyzed for each point (Figures 6-8). In this case, the observer views the landscape from three different angles to note scenery and components.     Figure 11). An outstanding characteristic is that the sea is only present at landscape scopes A and B; the other landscape scopes correspond to mountainous areas. Scope B has the most spatial and functional complexity since it corresponds to the urbanized areas of Santiago de Cuba. This is followed by scope A, which corresponds to the multifunctional zone at the entrance of Santiago Bay. Scopes C, D and E correspond to rural spaces, which present less anthropogenic activities and, thus, less spatial complexity than A and B.  Figure 11). An outstanding characteristic is that the sea is only present at landscape scopes A and B; the other landscape scopes correspond to mountainous areas. Scope B has the most spatial and functional complexity since it corresponds to the urbanized areas of Santiago de Cuba. This is followed by scope A, which corresponds to the multifunctional zone at the entrance of Santiago Bay. Scopes C, D and E correspond to rural spaces, which present less anthropogenic activities and, thus, less spatial complexity than A and B. Sustainability 2021, 13, 4773 15 of 31     The 29 landscape units included in the 5 landscape scopes were valued according to the scale proposed in three categories by the IMLA (Table 5), the process revealed the great differences between landscape units and landscape scopes. That is a consequence of the variety of functions present at landscapes of the visual gap due to the relief complexity and different kinds of spaces. Analysis of landscape unit valuation showed predominance of high scenic values due to the amphitheater characteristics of the visual gap, which enabled multiple scenes from different positions. Medium natural and cultural values predominated, as did high and medium historical values.
A and B, entrance to the Bay and Santiago de Cuba city respectively, were the scopes with higher values, followed by mountainous scopes. Those with plateaus had lowest values. Analysis of the 29 landscape units resulted in 7 Units with Category I (representing 24%), 15 Units with Category II (52%) and 7 Units with Category III (24%).
Medium and high values categories predominate at the entrance of the Bay and the city of Santiago de Cuba. Categories of medium value predominate at mountainous scopes, while categories of low and medium values predominate at scopes with plateaus. Valuation of landscape units and scopes resulted in defining the general landscape values ( Table 6).
Enhancing the cultural value requires improving the quality of constructions at the first coastline of Santiago de Cuba city, mainly of houses and industrial buildings. Improving the scenic value means establishing more points of observation and opening the city to waterfront. Note that such recommendations facilitate desired synergisms because preserving the natural landscape and improving the appearance of existing buildings will enhance the scenic value. Implementation of these recommendations requires the establishment of a legal framework of landscape regulations and a corresponding management authority to put them into practice.
The following additional actions regarding value categories of landscape units and scopes are recommended: preservation and integrated protection of landscapes that have special values per Category I; preservation with modifications, as well as rehabilitation  (Table 5), the process revealed the great differences between landscape units and landscape scopes. That is a consequence of the variety of functions present at landscapes of the visual gap due to the relief complexity and different kinds of spaces. Analysis of landscape unit valuation showed predominance of high scenic values due to the amphitheater characteristics of the visual gap, which enabled multiple scenes from different positions. Medium natural and cultural values predominated, as did high and medium historical values.
A and B, entrance to the Bay and Santiago de Cuba city respectively, were the scopes with higher values, followed by mountainous scopes. Those with plateaus had lowest values. Analysis of the 29 landscape units resulted in 7 Units with Category I (representing 24%), 15 Units with Category II (52%) and 7 Units with Category III (24%).
Medium and high values categories predominate at the entrance of the Bay and the city of Santiago de Cuba. Categories of medium value predominate at mountainous scopes, while categories of low and medium values predominate at scopes with plateaus. Valuation of landscape units and scopes resulted in defining the general landscape values (Table 6).   Enhancing the cultural value requires improving the quality of constructions at the first coastline of Santiago de Cuba city, mainly of houses and industrial buildings. Improving the scenic value means establishing more points of observation and opening the city to waterfront. Note that such recommendations facilitate desired synergisms because preserving the natural landscape and improving the appearance of existing buildings will enhance the scenic value. Implementation of these recommendations requires the establishment of a legal framework of landscape regulations and a corresponding management authority to put them into practice.
The following additional actions regarding value categories of landscape units and scopes are recommended: preservation and integrated protection of landscapes that have special values per Category I; preservation with modifications, as well as rehabilitation and remodeling to recover affected or lost values in the units with landscapes scored in Categories II and III.
Finally, recommendations are proposed for the value management of the landscape of Santiago de Cuba Bay (level 4 of the method IMLA). These are described for each of the three factors considered by IMLA (natural, cultural and scenic factors), Table 7.
The new IMLA considers land use patterns and landform as important sources of information that contribute to the formation of landscape perceptions and values [37]. The most significant recommendations for value management of the natural landscape focus on preserving the relief characteristics and the irregular shape of the Santiago de Cuba Bay, as well as on preserving and improving vegetation and current land-uses. To establish a regulatory framework to punish actions such as logging and poaching, the extraction of soils from nearby quarries, the unauthorized access of people to the mangrove and the introduction of non-native species.
• To improve the state of residential buildings located on the first coastline of the city of Santiago de Cuba. Emphasize roof solutions, which must be adapted to the typological characteristics of the context.

•
To carry out maintenance actions for buildings constituting landmarks in the landscape.

•
To recover the residential wooden buildings in the "El Tivoli" neighbourhood. Establish constructive regulations on the height, location and altitude of the new constructions, so that they create harmonious relationships with the context of the setting.

•
To recover disused warehouses in the coastal zone for use with public functions related to the sea.

•
Remodel warehouses in the port area. To promote improvements in structures associated with warehouses, the thermo-electric plant, the refinery, the mill, the cement factory, the shipyard and the Guillermón Moncada port warehouses).

•
To carry out actions to remove dirt, stains, inadequate coatings and lack of paint that produce a negative visual impact on the landscape.

•
To convert the industrial environment of the cement factory to a space for public functions with a direct link to the bay.

•
Rehabilitate the tourist road as a significant way to contemplate the landscape, rescuing the multiple viewpoints that it offers.

•
To establish framework for the regulation and control of the interventions carried out on the landscape of the Bay's basin.

•
To create a specialized multi-disciplinary group that puts into practice the regulatory framework and contributes to the decision-making regarding the actions carried out around the Bay.

Key Observations about the Landscaping Approach
The conceptual complexity and diversity of "landscape" can be summarized as a set of socio-ecological relations that result in a visual manifestation; an approach taken into account herein. The literature review (Table 1) shows that consensus on landscape values exists only for a few propositions, such as the importance of the aesthetic value in eight proposals, natural and cultural in seven and natural and historical and environmental with six and five respectively. Divergences are more frequent in economic, ethnologic, territorial, religious and biological values and may derive from the diversity of disciplinary backgrounds of the authors. The lack of unity illustrates the importance and the originality of considering the integrated characterization and valuation of landscape (IMLA) for sustainable management. Therefore, this research considers the integrated landscape approach [76] as a way to understand and manage the environment in accordance with the United Nation's Sustainable Development Goals (SDGs).
Analyzing landscape approaches also showed the stark difference between landscape and image. Landscape represents a marked physical character [5,20,21] while image refers to a clear conceptual nature, centralizing complex interactions and relationships among people and their environment [14,77]. In this research, landscape was considered as a visible manifestation and not as a mental representation leading to psycho-perceptual valuation.
Different epistemological approaches can be used to study landscape. At present, there is a marked tendency to interrelate and articulate diverse aspects for integrated landscape analysis [8,78]. The approach used in this research (IMLA) to characterize and assess landscape for value management is based on three essential ideas: (1) Landscape is a phenomenon historically conditioned by a culture [48,77]. Landscape can be understood as a process in continuous evolution due to the different societies and corresponding histories, where all cultural aspects are involved; wherefore landscape constitutes a reflection of the historical development of human society, showing the ways of life in a given territory according to human appropriation and exploitation. (2) The whole territory and the elements interrelated thereto, constitute the landscape [14,79]. In this case, (i) the whole space is analyzed from the physical-geographical point of view and (ii) all its elements are analyzed in order to group them into two main systems: the natural elements, including biotic and abiotic components; and the cultural elements, derived from human actions and their relationships. (3) Landscape is a scene thus, it can be observed [80,81]. Landscape is analyzed by the observer from a specific position or several ones, since landscape is conceived as an object of contemplation, which involves seeing or observing.

Lessons Derived from IMLA
Visual landscape quality assessment refers to the methodological proposal used to describe and evaluate the scenic beauty of landscapes [43].
Analysis of various methodologies showed diversity of variables used to understand landscapes how each technique is shaped by the study area. Previous methodological experiences and studies about landscape were considered for the method proposed herein [13,23,[25][26][27][28][29]37,49,[82][83][84]. Landscape was classified according to its values. However, IMLA can be contrasted with other approaches [44]. IMLA facilitates the inclusion of a sensitivity index that accounts for the interaction of o natural processes and human pressure.
Landscape valuation derived from consideration of historical-social processes responsible for the current landscape configuration, rejecting a subjective approach [85].
A diversity of approaches employing visual-aesthetic values for policy scenarios appear in the literature [86]. Other include aesthetic and ecological values [87,88], or interviews with a qualitative approach and visual data to explore landscape values IMLA employed a formal approach rooted in theoretical-considerations to define the landscape. Critical analysis of the different methodologies led to determining the system of factors, variables and sub-variables used for the integrated characterization and valuation of the subject of study. IMLA incorporated the various points of view expressed by different specialists in the surveys and expert committees created to discuss landscape values.
The stage of landscape characterization led to establishing the specific characteristics and delimitation of the subject of study, as well as analysis of its social-historical conditions. Landscape characterization originated from the examination of the most general elements of the system, i.e., natural, cultural and scenic factors. We determined and summarized essential features of the landscape, its scopes and landscape units following an evaluativeanalytical process. Experiences derived from landscape and on-site valuation carried out by different authors offered the starting point for level three of the method. Additionally, we considered previous characterizations of the subject of study. Values assigned to landscape and an associated qualitative scale facilitated determination of the different value categories. The new IMLA considers the potential range of values associated with each landscape unit and facilitates effective landscape management. "Landscape assessment constitutes a bridge between scientific knowledge and socio-economic issues that are needed to meet the demands of sustainable landscape planning and management" [89]. Moreover, landscape analysis will help regional authorities plan and find a consensus for multiple societal needs and demands [90,91]. This is critical to resolving land use conflicts to achieve sustainable development [92].
These landscape units have been historically threatened by natural events associated with forest fires, the rise in mean sea level due to climate change and impact of hurricanes and related strong winds, coastal flooding and erosion processes. There are other threats of anthropic origin that also put in danger landscape units investigated in this paper, e.g., pollution linked to atmospheric contamination, discharge of solid waste materials and wastewaters from urban activities, deforestation, poaching, etc.
IMLA facilitates continuous systematic landscape reevaluation. This is required for safeguarding of landscape values and the work to recover degraded landscapes and those in danger of disappearing. IMLA requires a multidisciplinary team to incorporate the cultural, social and environmental aspects into management recommendations. Furthermore, effective implementation means using adaptive management that responds to planning, designing and assessment at multiple scales [93,94]. IMLA requires continuous feedback from all stakeholders.

Validation of IMLA in the Study Site
The landscape visual gap of Santiago de Cuba Bay constitutes a cultural landscape with a high anthropization level indicative of the quick urban development following the founding of the city [60,95]. Validation of IMLA defined the evolutive stages demarked by major incidences of landscape transformations. The IMLA enables landscape planning that considers the complexity of relevant features rather than single components and objects of protection in isolation [89]. IMLA responds to the problem of confusion created by attempting to incorporate too many variables absent of a systematic approach [15,[30][31][32][33][34].
Examining the different landscape components when validating the proposed system of factors, variables and sub-variables, resulted in recognizing the natural, cultural and scenic characteristics of the visual gap. The irregular relief, the water-mirror surface of the bay and the diversity in vegetation predominate among the natural landscape's components. Fauna, except for birds and rolling rivers at the visual gap, is not a significant natural landscape component in this method. IMLA is consistent with the proposals of many authors [96][97][98]. A group of authors analyzed the diversity of natural landscapes measuring specific aspects such as natural heritage sites and natural viewpoints [28,53,[99][100][101]. Others used natural indicators, such as the diversity of relief, watercourses, coastal lagoons, estuaries and beaches [26,44,[102][103][104]. In this application of IMLA, we did not consider noise pollution, but it certainly could be included in future analysis.
The urbanization of Santiago de Cuba city, with large residential areas and industrial zones, imbedded in an outstanding landscape of the visual gap, predominates among the cultural components. Furthermore, agro-systems influence the landscape by altering the vegetation [59,72].
The visual components are the most significant among the scenic factors, due to the contrast in colors, shapes, textures and lines of landscape [14], although spatial features are also significant because of the great number of landmarks, especially the man-built ones.
The most relevant physical components are relief, human actions and presence of water, vegetation and scenic background. In general, the validation proved the effectiveness of the method for landscape characterization, valuation and value management.
As discussed above and shown in Table 4 and Appendix D, a range of high, medium and low values for Landscape Units were identified in Santiago de Cuba Bay. The case study revealed that as in the [48] research, values were not limited to the physical forms of landscapes units, but also related to contemporary or anthropic past practices. Validating the method at Santiago de Cuba Bay establishes the usefulness of this tool for decisionmaking processes about value protection at cultural landscapes.
Landscape scientists will find IMLA useful in addressing the loss of identity and cultural heritage [99,100]. The method contributes to the implementation of the UNESCO Cultural Heritage Protection Act [105] that, in the study area, has one example declared as Cultural Heritage of Humanity: The Castle San Pedro de la Roca [106]. Due to its historical and landscape values that need to be protected, the castle was the object of a comprehensive rehabilitation project in recent years [107].
Such researchers are conscious of the benefits that coastal ecosystems like estuarine, lagoons and mountain bay have provided to local populations. These landscapes are an excellent example of the interdependence between nature and man. IMLA analyzed a cultural landscape resistant to changing natural, cultural and scenic factors. It generated recommendations to be tested in Santiago de Cuba Bay for improving the resilience of a landscape long affected by human activity. Our proposal is compatible with other studies of coastal landscapes recently carried out in Cuba [108,109].
IMLA assumes the sustainable landscape approach [110], determining that, for sustainable management of landscape, citizen participation must be granted. Communities, together with the government and decision-makers, can manage the natural capital of the area and the wide range of uses, to reduce anthropogenic impacts and improve long-term human well-being in a changing world.

Conclusions
Critically assessing several methods for landscape analysis led to the establishment of a system of natural, cultural and scenic factors, as well as of variables and sub-variables for an integrated characterization and valuation of landscape from the adopted holistic approach. IMLA structure includes four levels of analysis: (1) Definition of the landscape to be analyzed; (2) Landscape characterization, including analysis of the historical-social conditions and delimitation into landscape scopes and landscape units; (3) Landscape valuation; and (4) Landscape value management; the last stage of the whole process where recommendations for landscape re-valuation are provided.
The method is systematic and includes both inductive and deductive reasoning. For the analysis, the parts and components of the method were classified into sub-systems. Its articulation is represented in the conjunction and overlapping of all factors and variables proposed.
Five historical evolutive stages of the visual gap from Santiago de Cuba Bay were identified when validating the method:        Presence of different geographical accidents.

Appendix E. Parameters of Valuation for Each Value
Geographical accidents with some anthropic components.
Geographical accidents not visible or completely changed by human anthropic activity.
Rivers with cascades, wetlands, polylobuled pocket bays with irregular perimeter.
Rivers of short course and low volume, wetlands, pocket bays without irregularities.
No rivers, nor wetlands. Bays without irregularities in their perimeters.
Biodiversity, presence of endemic species and/or in danger of extinction, migratory birds, natural vegetation, mainly woods in advanced states.
Biodiversity without endemic species and/or migratory birds or in danger of extinction, secondary and cultural vegetation in intermediate states.
No biodiversity, no endemic species, no migratory birds or in danger of extinction, cultural and secondary vegetation in early states.
Climatic conditions with visibility, air transparency, luminosity.
Climatic conditions with medium visibility and low luminosity due to air transparency.
Climatic conditions without good visibility, air opacity and low luminosity.

Cultural Value High Value Medium Value Low Value
• Human prints in landscape throughout the years. • Urban and/or rural settlements and presence of architectonic, industrial, touristic, port and airport complexes. • Agro-systems related to agriculture, cattle, or forest exploitation. • Infrastructures like roads, bridges, water reservoirs, channels.
Settlements with formal quality and good harmony.
Settlements with formal quality, but with presence of inharmonic or discordant elements.
Settlements without formal quality and with inharmonic or discordant elements.
Components apparently well preserved.
Components apparently not well preserved.
Components apparently bad preserved.
Patrimonial and traditional values with national and/or international recognition.
Patrimonial and traditional values locally recognized.
No patrimonial nor traditional values.
Productive agro-systems apparently with good installations.
Productive agro-systems apparently with not good installations.
No productive agro-systems.
Infrastructures apparently in good state.
Infrastructures apparently in regular state.
Infrastructures apparently in bad state.

Historic Value High Value Medium Value Low Value
• Presence of outstanding events and personalities regarding to politics, culture, religion, science, production, army, or society, representing landscape historical evolution.
International connotation of the landscape historical aspects.
National, provincial or municipal connotation of the landscape historical aspects.
Local or contextual connotation of the landscape historical aspects. Presence of natural and anthropic milestones.
Presence of natural or anthropic milestones. No milestones.