scholarly journals Detection of the TiO2 Concentration in the Protective Coatings for the Cultural Heritage by Means of Hyperspectral Data

2020 ◽  
Vol 13 (1) ◽  
pp. 92
Author(s):  
Antonio Costanzo ◽  
Donatella Ebolese ◽  
Silvestro Antonio Ruffolo ◽  
Sergio Falcone ◽  
Carmelo la Piana ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Cultural Heritage ◽  
Urban Areas ◽  
Protective Coatings ◽  
Colloidal Suspensions ◽  
Hyperspectral Data ◽  
Weight Percentage ◽  
Stone Materials ◽  
Test Application ◽  
Nanoparticle Coatings

Nanotechnology-based materials are currently being tested in the protection of cultural heritage: ethyl silicate or silica nanoparticles dispersed in aqueous colloidal suspensions mixed with titanium dioxide are used as a coating for stone materials. These coatings can play a key role against the degradation of stone materials, due to the deposit of organic matter and other contaminants on the substrate, a phenomenon that produces a greater risk for the monuments in urban areas because of the increasing atmospheric pollution. However, during the application phase, it is important to evaluate the amount of titanium dioxide in the coatings on the substrate, as it can produce a coverage effect on the asset. In this work, we present the hyperspectral data obtained through a field spectroradiometer on samples of different stone materials, which have been prepared in laboratory with an increasing weight percentage of titanium dioxide from 0 to 8 wt%. The data showed spectral signatures dependent on the content of titanium dioxide in the wavelength range 350–400 nm. Afterwards, blind tests were performed on other samples in order to evaluate the reliability of these measurements in detecting the unknown weight percentage of titanium dioxide. Moreover, an investigation was also performed on a test application of nanoparticle coatings on a stone statue located in a coastal town in Calabria (southern Italy). The results showed that the surveys can be useful for verifying the phase of application of the coating on cultural heritage structures; however, they could also be used to check the state of the coated stone directly exposed over time to atmospheric, biological and chemical agents.

scholarly journals Testing the Feasibility of Titanium Dioxide Sol-Gel Coatings on Portuguese Glazed Tiles to Prevent Biological Colonization

Coatings ◽  
2020 ◽  
Vol 10 (12) ◽  
pp. 1169
Author(s):  
Mathilda L. Coutinho ◽  
João Pedro Veiga ◽  
Maria Filomena Macedo ◽  
Ana Zélia Miller
Keyword(s):  
Titanium Dioxide ◽  
Cultural Heritage ◽  
Protective Coatings ◽  
Ceramic Body ◽  
Sol Gel ◽  
Fungal Growth ◽  
Tio2 Coating ◽  
X Ray Diffraction ◽  
Mineralogical Characterization ◽  
X Ray

Historical glazed wall tiles are a unique vehicle of artistic expression that can be found outdoors, integrating the buildings of many countries, therefore they are often subjected to biodeterioration. In this work, the applicability of protective coatings on glazed tiles to prevent biological colonization was evaluated. Thin films of titanium dioxide (TiO2) obtained by sol-gel were applied on glazed tiles to appraise its anti-biofouling properties and to evaluate their suitability for cultural heritage application. The TiO2 coating was tested on four different Portuguese glazed tiles and a modern tile. The chemical and mineralogical characterization of the glaze and ceramic body of the tiles was examined by wavelength dispersive X-ray fluorescence spectroscopy (WDXRF) and X-ray diffraction (XRD). The produced TiO2 coating was chemically and morphologically characterized by micro Raman spectroscopy (µ-Raman) and field emission scanning electron microscopy (FESEM). The anti-biofouling properties of the TiO2 treatment were evaluated by inoculating the fungus Cladosporium sp. on the glazed tiles. Potential chromatic and mineralogical alterations induced by the treatment were assessed by color measurements and XRD. The TiO2 coating did not prevent fungal growth and caused aesthetical alterations on the glazed tiles. A critical analysis evidenced that the tested coating was not suitable for cultural heritage application and highlighted the challenges of developing protective coatings for glazed tiles.

scholarly journals The Awareness of and Input into Cultural Heritage Preservation by Urban Planners and Other Municipal Actors in Light of Climate Change

Atmosphere ◽  
2021 ◽  
Vol 12 (6) ◽  
pp. 726
Author(s):  
Paul Carroll ◽  
Eeva Aarrevaara
Keyword(s):  
Climate Change ◽  
Cultural Heritage ◽  
Urban Areas ◽  
Climate Change Impacts ◽  
Town Planning ◽  
Urban Setting ◽  
Heritage Preservation ◽  
Climate Conditions ◽  
The Future ◽  
Cultural Heritage Preservation

Future climate conditions need to be considered in planning for urban areas. As well as considering how new structures would best endure in the future, it is important to take into account factors that contribute to the degradation of cultural heritage buildings in the urban setting. Climate change can cause an increase in structural degradation. In this paper, a review of both what these factors are and how they are addressed by urban planners is presented. A series of inquiries into the topic was carried out on town planning personnel and those involved in cultural heritage preservation in several towns and cities in Finland and in a small number of other European countries. The target group members were asked about observed climate change impacts on cultural heritage, about present steps being taken to protect urban cultural heritage, and also their views were obtained on how climate change impacts will be emphasised in the future in this regard. The results of the inquiry demonstrate that climate change is still considered only in a limited way in urban planning, and more interaction between different bodies, both planning and heritage authorities, as well as current research on climate change impacts, is needed in the field.

Classification of hyperspectral data in urban areas

1998 ◽  
Author(s):  
Bing Zhang ◽  
Jiangui Liu ◽  
Xiangjun Wang ◽  
Changshan Wu
Keyword(s):  
Urban Areas ◽  
Hyperspectral Data

scholarly journals Automatic Extraction of Grasses and Individual Trees in Urban Areas Based on Airborne Hyperspectral and LiDAR Data

2020 ◽  
Vol 12 (17) ◽  
pp. 2725
Author(s):  
Qixia Man ◽  
Pinliang Dong ◽  
Xinming Yang ◽  
Quanyuan Wu ◽  
Rongqing Han
Keyword(s):  
Urban Areas ◽  
Three Dimensional ◽  
Hyperspectral Data ◽  
Classification Method ◽  
Urban Vegetation ◽  
Individual Tree ◽  
Cloud Data ◽  
Random Forest Classification ◽  
The Individual ◽  
Individual Trees

Urban vegetation extraction is very important for urban biodiversity assessment and protection. However, due to the diversity of vegetation types and vertical structure, it is still challenging to extract vertical information of urban vegetation accurately with single remotely sensed data. Airborne light detection and ranging (LiDAR) can provide elevation information with high-precision, whereas hyperspectral data can provide abundant spectral information on ground objects. The complementary advantages of LiDAR and hyperspectral data could extract urban vegetation much more accurately. Therefore, a three-dimensional (3D) vegetation extraction workflow is proposed to extract urban grasses and trees at individual tree level in urban areas using airborne LiDAR and hyperspectral data. The specific steps are as follows: (1) airborne hyperspectral and LiDAR data were processed to extract spectral and elevation parameters, (2) random forest classification method and object-based classification method were used to extract the two-dimensional distribution map of urban vegetation, (3) individual tree segmentation was conducted on a canopy height model (CHM) and point cloud data separately to obtain three-dimensional characteristics of urban trees, and (4) the spatial distribution of urban vegetation and the individual tree delineation were assessed by validation samples and manual delineation results. The results showed that (1) both the random forest classification method and object-based classification method could extract urban vegetation accurately, with accuracies above 99%; (2) the watershed segmentation method based on the CHM could extract individual trees correctly, except for the small trees and the large tree groups; and (3) the individual tree segmentation based on point cloud data could delineate individual trees in three-dimensional space, which is much better than CHM segmentation as it can preserve the understory trees. All the results suggest that two- and three-dimensional urban vegetation extraction could play a significant role in spatial layout optimization and scientific management of urban vegetation.

scholarly journals Tangible Cultural Heritage Re-Appropriation Towards A New Urban Centrality. A Critical Crossroad In Semi-Peripheral Eastern Riverside Lisbon

2020 ◽  
Vol 13 (3) ◽  
pp. 139-146
Author(s):  
Joao C. Martins
Keyword(s):  
Cultural Heritage ◽  
Urban Areas ◽  
Urban Regeneration ◽  
Ground Level ◽  
Ground Field ◽  
Public And Private ◽  
Positive Effects ◽  
The Creation ◽  
Tangible Culture ◽  
Private Investors

. The transformation of decayed semi-peripheral riverside areas and its Tangible Culture Heritage is presented today as a contributing factor in urban regeneration by several public preservation bodies and agendas, as well as privately led investment. These practices demand the economic and symbolic valorization of abandoned Tangible Cultural Heritage, where the social coexistence of residents, workers and visitors is seen as a smoother urban integration of these deprived territories and their communities into the surrounding contemporary cities.We’ll focus our approach on socio-spatial changes occurring in Marvila and Beato, presented today as new urban areas in which to financially invest after the 2011 economic crisis occurred in Portugal, discussing public and private re- appropriation of Old Palaces, Convents and Farms and Reconverted Warehouses (industrial and commercial); towards the creation of a new urban centrality in Lisbon. In this case, public ground-field intervention established a culture led regeneration process, with the creation of a municipal library, a crucial point in the cultural use of this space, community participation and gathering. Dealing with private investors, despite the positive effects, such as a reduction in unemployment, economic diversification and re-use of urban voids, there is always the possibility of undesired consequences. This paper argues, and the research experiments in many European cities show us that the ambition to improve the image of these deprived areas, despite somGonzalex encouraging ground level achievements, has unwanted or unexpected outcomes, starting as urban regeneration practices, often sliding towards gentrification, where local public powers have a determinant role.

scholarly journals Tecnologias digitais no ensino de história e valorização do patrimônio cultural da Amazônia brasileira / Digital Technologies in History Teaching and Valorization of Cultural Heritage in Brazilian Amazon

2016 ◽  
Vol 1 (2) ◽  
Author(s):  
Benedito Walderlino De Souza Silva
Keyword(s):  
Cultural Heritage ◽  
Urban Areas ◽  
Teaching And Learning ◽  
Digital Technologies ◽  
Brazilian Amazon ◽  
Starting Point ◽  
Cultural Appreciation ◽  
On Line ◽  
America Latina ◽  
Artistic Heritage

ABSTRACTThis article focuses on conceptual and methodological issues concerning the contribution that digital technologies can provide to School education in the context of the teaching and learning of history in matters related to cultural heritage process. Brazil has the “Instituto do Patrimônio Histórico e Artístico Nacional” (Institute of National Historical and Artistic Heritage) to implement public policies in order to to preserve their culture. In partnership with the “Universidade Federal do Pará” (Federal University of Pará), the unit of the institute in the state of Pará has developed a tool of heritage education called “Ver-o-Site”, an online page with the objective of increasing the cultural appreciation of Ver-o-Peso, the largest free fair in Latin America, a cultural and touristical symbol, and also the starting point of this state capital, the city of Belém. As we evaluate the considerable importance that digital technologies like this have on students' lives, creating new forms and speed of access and sharing of information, we consider that educators must use them as educational tools. With the Ver-oSite, you can work aspects of colonial occupation process, historical, economic and social development of urban areas in the Brazilian Amazon, as well as the space that places like the Ver-o-Peso occupy in the cultural heritage of inhabitants of cities like Belém. Such action aims to strengthen the role of social formation of the school with students in the digital age.RESUMOEste trabalho objetiva discutir fundamentos conceituais e teórico-metodológicos relativos à contribuição que tecnologias digitais podem fornecer a educação escolar no contexto do processo de ensino-aprendizagem da disciplina história em assuntos relacionados ao patrimônio cultural. O Brasil conta com o Instituto do Patrimônio Histórico e Artístico Nacional para executar políticas públicas de preservação de sua cultura. Em parceria com a Universidade Federal do Pará, a unidade do instituto no Estado Pará desenvolveu uma ferramenta de educação patrimonial chamada Ver-o-Site, uma página on-line voltada à valorização cultural do Ver-o-Peso, a maior feira livre da América Latina, símbolo cultural, turísti-co e ponto de origem da capital deste estado, a cidade de Belém. Avaliando o espaço considerável que tecnologias digitais como esta têm na vida dos alunos, gerando novas formas e velocidade de acesso e socialização de informação, pondera-se que os educadores devam utilizá-las como ferramentas educativas. Com o Ver-o-Site, pode-se trabalhar aspectos do proces-so de ocupação colonial, formação histórica, econômica e social de núcleos urbanos da Amazônia brasileira, bem como o espaço que lugares como o Ver-o-Peso ocupam no patrimônio cultural de habitantes de cidades como Belém. Tal ação visa fortalecer o papel de formação social da escola junto aos alunos na era digital. Contato principal: [email protected]

scholarly journals Exposure Indices of Extreme Wind-Driven Rain Events for Built Heritage

Atmosphere ◽  
2020 ◽  
Vol 11 (2) ◽  
pp. 163 ◽  
Author(s):  
Scott Allan Orr ◽  
May Cassar
Keyword(s):  
Cultural Heritage ◽  
Exposure Assessment ◽  
Urban Areas ◽  
Prolonged Exposure ◽  
Extreme Weather Events ◽  
Assessment Procedure ◽  
Statistical Confidence ◽  
Potential Impact ◽  
Rain Events ◽  
Two Stages

Building performance and material change of cultural heritage in urban areas are negatively impacted by wind-driven rain (WDR). The frequency and intensity of WDR exposure are modified by climate change. Current approaches to exposure assessment emphasise prolonged exposure. Here, we propose indices to represent the exposure of cultural heritage to extreme WDR events. The indices are derived in two stages: (1) time-binning of long-term exposure, and (2) statistical representation of the occurrence of infrequent but intense events by fitting to the Generalised Extreme Value (GEV) distribution. A comparison to an existing exposure assessment procedure demonstrates that the proposed indices better represent shorter, more intense, and more consistent WDR events. Indices developed for seasons had greater statistical confidence than those developed for annual exposure. One index is contextualised within a model of a gutter on a terraced building: this converts the index from a measure of exposure to potential impact. This evaluation demonstrated the importance of maintenance to reduce the potential impact of WDR events. This work has direct and indirect implications for developing robust assessment procedures for cultural heritage exposure to extreme weather events.

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