scholarly journals Sky View Factor footprints for urban climate modeling

Urban Climate ◽  
2018 ◽  
Vol 25 ◽  
pp. 120-134 ◽  
Author(s):  
Ariane Middel ◽  
Jonas Lukasczyk ◽  
Ross Maciejewski ◽  
Matthias Demuzere ◽  
Matthias Roth
2011 ◽  
Vol 105 (3-4) ◽  
pp. 521-527 ◽  
Author(s):  
Martin Hämmerle ◽  
Tamás Gál ◽  
János Unger ◽  
Andreas Matzarakis

2015 ◽  
Vol 1 (1) ◽  
pp. 160 ◽  
Author(s):  
Erika Colischonn ◽  
Caio Vinícius De Oliveira Ferreira

O clima urbano é resultado das ações de diversas variáveis, entre elas o fator de visão do céu (FVC). Este artigo apresenta incialmente a metodologia utilizada para calcular o fator de visão do céu em dez postos de coleta de temperatura e umidade do ar na cidade de Pelotas-RS e, na sequência, um estudo comparativo do comportamento da temperatura e da umidade relativa do ar entre estes mesmos dez locais. Os dados resultam de três períodos de registro no ano de 2014: o primeiro em agosto/setembro, o segundo em novembro, o terceiro em dezembro. Cada ponto de coleta consistiu num pequeno coletor eletrônico de dados de temperatura e umidade relativa do ar (ONSET - U23-001), disposto dentro de um abrigo fixo a um tripé distante 1,5 metros do chão, que registrou dados de 30 em 30 minutos. Os resultados mostram relação entre o microclima e o FVC. Nos levantamentos considerados os registros nos locais de maior obstrução foram em mais de 70% das vezes superiores à média. As áreas menos obstruídas também foram aquelas que apresentaram temperaturas mais baixas que a média. Os locais mais frios que a média também apresentaram umidade relativa do ar mais alta que a média.Palavras-chave: Fator de visão do céu, temperatura e umidade do ar. The Sky View Factor and its Influence on the Intra-Urban Thermal-Hygrometric Features in Pelotas City - Rio Grande do Sul State, BrazilABSTRACTUrban climate is the result from several variables, among them, there is the sky view factor (SVF). This article identifies the sky view factor (SVF) use in an urban climate study made in Pelotas, Brazil. The research compares the temperature and relative humidity behaviors in ten various sampling stations, based on data collected from them. The results were obtained from three recording periods held in 2014: the first from August/September, the second from November and the third from December. Each station was equipped with a temperature and humidity datalogging device (ONSET - U23 001). They were placed inside a radiation shield that was attatched to a tripod 1.5m above the ground, where each device would register data every 30 minutes. The results unveiled relations between the SVF and the microclimate. From the samples that were taken in consideration, places with high obstruction were, 70% of the time, above the calculated average. The places with low obstruction were also where the biggest amount of below-average data was found. In addition, the places that were colder than average were the ones presenting higher than average relative humidity rates.Key-words: sky view factor, air temperature, relative humidity.


2021 ◽  
Author(s):  
xiaojiang li ◽  
Guoqing Wang

Abstract The sky view factor (SVF) that represents the fraction of visible sky on a hemisphere or the percentage of radiation reaching the planar ground in the entire hemisphere’s input radiation is an important parameter for urban climate studies. However, the estimation of a continuous SVF map is very time-consuming, which limits the applications of SVF to small geographical areas. This study proposed to use graphics processing unit (GPU) parallel computing to accelerate the computing of SVF in the city of Philadelphia, Pennsylvania, USA. This study implemented and compared both the GPU-accelerated version and regular CPU version of two major methods for estimating continuous SVF maps, ray tracing-based algorithm and shadow casting-based algorithm based on the high-resolution building height model. Results show that the GPU-accelerated algorithms can reduce the time consumption dramatically and estimate the SVF map for the city of Philadelphia in less than 20 minutes on a personal computer with one NVIDIA GPU. The ray tracing-based algorithm has a much more efficiency increase than the shadow casting-based algorithm on GPU. The proposed method makes it possible to generate large-scale continuous SVF maps using regular personal computers with GPU. The proposed GPU-accelerated SVF estimation methods would benefit urban climate studies.


2021 ◽  
Author(s):  
Zian Wang ◽  
Guoan Tang ◽  
Guonian Lü ◽  
Cheng Ye ◽  
Fangzhuo Zhou ◽  
...  

2020 ◽  
Vol 45 (1) ◽  
pp. 411-444 ◽  
Author(s):  
Valéry Masson ◽  
Aude Lemonsu ◽  
Julia Hidalgo ◽  
James Voogt

Cities are particularly vulnerable to extreme weather episodes, which are expected to increase with climate change. Cities also influence their own local climate, for example, through the relative warming known as the urban heat island (UHI) effect. This review discusses urban climate features (even in complex terrain) and processes. We then present state-of-the-art methodologies on the generalization of a common urban neighborhood classification for UHI studies, as well as recent developments in observation systems and crowdsourcing approaches. We discuss new modeling paradigms pertinent to climate impact studies, with a focus on building energetics and urban vegetation. In combination with regional climate modeling, new methods benefit the variety of climate scenarios and models to provide pertinent information at urban scale. Finally, this article presents how recent research in urban climatology contributes to the global agenda on cities and climate change.


2020 ◽  
Vol 76 (1) ◽  
pp. 44-52
Author(s):  
Shuh MATSUDA ◽  
Hisashi YOSHIKOSHI ◽  
Tomoyo SUZUKI ◽  
Yuuki OHTA ◽  
Ayaka CHIBA ◽  
...  

2015 ◽  
Vol 74 ◽  
pp. 279-286 ◽  
Author(s):  
J. Ramírez-Faz ◽  
R. López-Luque ◽  
F.J. Casares
Keyword(s):  

2019 ◽  
Vol 2 ◽  
pp. 1-8
Author(s):  
Shoko Nishio ◽  
Fumiko Ito

<p><strong>Abstract.</strong> We applied a computation method of calculating the sky view factor (SVF) using Google Street View to Shibuya area, Tokyo, for the purpose of examining the relation between the SVF/SVF change and physical elements. The distribution of the SVF calculated by the above method was visualized, and the statistical process showed the tendency of a high SVF in quasi-residential districts and roadsides of high-graded trunk roads. The difference in the SVF change was small at 10-m intervals. The SVF change tended to be more apparent near an intersection and at different elevations.</p>


2015 ◽  
Vol 105 ◽  
pp. 211-219 ◽  
Author(s):  
Jinxin Yang ◽  
Man Sing Wong ◽  
Massimo Menenti ◽  
Janet Nichol

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