Comparative analysis of three NDVI resolutions in different urban typologies. The case of Granollers in the Metropolitan Area of Barcelona.

2021 ◽  
Author(s):  
Alan García-Haro ◽  
Josep Roca
Keyword(s):  
Climate Change ◽  
Metropolitan Area ◽  
Urban Studies ◽  
Rural Areas ◽  
Industrial Area ◽  
Landsat 8 ◽  
Urban Context ◽  
Urban Core ◽  
First Results ◽  
Definition Of

<p>In recent years, the use of remote sensed NDVI has become recurrent in urban studies regarding the adaptation of cities to climate change. However, due to the physical diversity within cities and the different resolution offered by the sensors, the territorial interpretation of what the NDVI values really mean becomes difficult. Where the larger the size of the cells of the image, the greater the number of elements of the built environment within it, and the more complex the interpretation becomes.</p><p>In this work, the relationship between the NDVI of three sensors with different cell resolution for the same location and date is studied. In particular, the city of Granollers in the Metropolitan Area of Barcelona is analyzed. First, the NDVI images were obtained from Landsat-8 with 30m resolution, Sentinel-2 with 10m and from the Ministry of Agriculture, Livestock, Fisheries and Food of Catalonia (DARP) with 0.125m resolution. Then, the comparison was performed with a sample of five different typologies of the territory: dense urban core, suburban, industrial, area of highway and rural.</p><p>As first results, a supervised classification of the DARP image allowed the definition of 0.30 as the precise minimum value of NDVI that indicates the actual presence of vegetation. On the other hand, the comparison indicates that, in the urban context, the larger the cell size, the presence of vegetation quality is overestimated, where the higher percentage of cells is concentrated in higher NDVI values than in those with lower resolution. However, this behavior is not appreciated in rural areas, where higher percentages of cells of different resolutions were concentrated in the same NDVI ranges.</p><p>In such a way, it is corroborated that it is in the urban context where this indicator has a greater difficulty of territorial interpretation. Statements that are analyzed in greater depth in this study, where its implications in the use of NDVI in urban studies for the adaptation of cities to climate change are discussed.</p>

scholarly journals Urban-Rural Relationships in Feeding Metropolis: A Case Study in Ljubljana Metropolitan Area

2014 ◽  
Vol 11 ◽  
pp. 259-264 ◽  
Author(s):  
Guido Sali ◽  
Stefano Corsi ◽  
Federica Monaco ◽  
Chiara Mazzocchi ◽  
Matjaž Glavan ◽  
...  
Keyword(s):  
Urban Development ◽  
Metropolitan Area ◽  
Rural Areas ◽  
Metropolitan Areas ◽  
Production Potential ◽  
Urban Centre ◽  
Urban Core ◽  
Urban Rural ◽  
Definition Of

Metropolitan areas are characterized by the coexistence of a urban core insisting on natural resources of surrounding rural areas, strictly linked to the former. Inevitably, increasing urbanization and its consequences affect the model of urban development, which then needs to deal with the challenge of sustainability, also aiming to reduce pressures on resources and on supplying capacities of rural agricultural systems in providing food to urban zones, traditionally lacking. It then becomes important to deepen the possibility for the dense core to be supplied through proximity agriculture, able to recreate and improve synergic connections between urban and rural spheres. The paper aims to study the relationships among them for feeding the metropolis, adopting a methodology for the spatial definition of urban centre in metropolitan area and the assessment of its food balance, in order to identify the potentialities of local and proximity agriculture and provide a first evaluation for the possibility to match urban development and production potential. Identified tools are applied to Ljubljana metropolitan area.

scholarly journals A Method for the Definition of Local Vulnerability Domains to Climate Change and Relate Mapping. Two Case Studies in Southern Italy

2020 ◽  
Vol 12 (22) ◽  
pp. 9454
Author(s):  
Mauro Francini ◽  
Lucia Chieffallo ◽  
Annunziata Palermo ◽  
Maria Francesca Viapiana
Keyword(s):  
Climate Change ◽  
Case Studies ◽  
Southern Italy ◽  
Early Stage ◽  
Local Level ◽  
Urban Context ◽  
Adaptation Measures ◽  
Mitigation And Adaptation ◽  
Climate Exposure ◽  
Definition Of

Climate change is contributing to raising disaster risk, with variable impacts depending on the local level of vulnerability. This paper describes a method for the definition of local vulnerability domains to climate change. The application of the methodology is aimed at building local vulnerability maps. The set of indicators of climate exposure, sensitivity and adaptive capacity, theoretically identified and practically tested on two case studies in southern Italy, contributes to support the territories in identifying the main local vulnerabilities, as well as define, subsequently, a systematic framework for identifying the most suitable mitigation and adaptation measures to climate change according to the specificities of the contexts of interest. In this regard, we consider the framework of risks and related impacts due to climate change on urban infrastructure proposed by the European Commission in order to face common challenges in the EU territories. Specifically, reference is made to three thematic focuses, which are “transport infrastructures”, “energy infrastructures” and “buildings and construction sector”. Although still at an early stage, the results of the research contribute to identifying useful elements of interrelation with the urban context for guiding resilient planning choices and reducing risks.

scholarly journals Algorithms to Assess Music Cities

SAGE Open ◽  
2017 ◽  
Vol 7 (1) ◽  
pp. 215824401769180 ◽  
Author(s):  
Andréa Jean Baker
Keyword(s):  
Urban Studies ◽  
Cultural Practices ◽  
Social Benefits ◽  
Urban Context ◽  
Industry Research ◽  
The Social ◽  
Definition Of ◽  
Social Importance ◽  
The City

The global Mastering of a Music City report in 2015 notes that the concept of music cities has penetrated the global political vernacular because it delivers “significant economic, employment, cultural and social benefits.” This article highlights that no empirical study has combined all these values and offers a relevant and comprehensive definition of a music city. Drawing on industry research,1 the article assesses how mathematical flowcharts, such as Algorithm A (Economics), Algorithm B (Four T’s creative index), and Algorithm C (Heritage), have contributed to the definition of a music city. Taking Melbourne as a case study, it illustrates how Algorithms A and B are used as disputed evidence about whether the city is touted as Australia’s music capital. The article connects the three algorithms to an academic framework from musicology, urban studies, cultural economics, and sociology, and proposes a benchmark Algorithm D (Music Cities definition), which offers a more holistic assessment of music activity in any urban context. The article concludes by arguing that Algorithm D offers a much-needed definition of what comprises a music city because it builds on the popular political economy focus and includes the social importance of space and cultural practices.

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