scholarly journals INVESTIGATION OF JOINT VISIBILITY BETWEEN SAR AND OPTICAL IMAGES OF URBAN ENVIRONMENTS

2018 ◽  
Vol IV-2 ◽  
pp. 129-136 ◽  
Author(s):  
L. H. Hughes ◽  
S. Auer ◽  
M. Schmitt
Keyword(s):  
Urban Environments ◽  
Work Flow ◽  
Simulation Framework ◽  
Urban Scenes ◽  
Optical Images ◽  
Definition Of ◽  
Acquisition Planning ◽  
The City ◽  
Very High

In this paper, we present a work-flow to investigate the joint visibility between very-high-resolution SAR and optical images of urban scenes. For this task, we extend the simulation framework SimGeoI to enable a simulation of individual pixels rather than complete images. Using the extended SimGeoI simulator, we carry out a case study using a TerraSAR-X staring spotlight image and a Worldview-2 panchromatic image acquired over the city of Munich, Germany. The results of this study indicate that about 55 % of the scene are visible in both images and are thus suitable for matching and data fusion endeavours, while about 25 % of the scene are affected by either radar shadow or optical occlusion. Taking the image acquisition parameters into account, our findings can provide support regarding the definition of upper bounds for image fusion tasks, as well as help to improve acquisition planning with respect to different application goals.

A case study of noise pollution levels during the restrictions period due to COVID-19.

2021 ◽  
Vol 263 (6) ◽  
pp. 206-214
Author(s):  
David Montes-González ◽  
Juan Miguel Barrigón-Morillas ◽  
Ana Cristina Bejarano-Quintas ◽  
Manuel Parejo-Pizarro ◽  
Guillermo Rey-Gozalo ◽  
...  
Keyword(s):  
Noise Pollution ◽  
Urban Environments ◽  
Control Measures ◽  
Acoustic Measurements ◽  
Pollution Levels ◽  
The World ◽  
The Impact ◽  
The City

The pandemic of coronavirus disease (COVID-19) led to the need for drastic control measures around the world to reduce the impact on the health of the population. The confinement of people in their homes resulted in a significant reduction in human activity at every level (economic, social, industrial, etc.), which was reflected in a decrease in environmental pollution levels. Studying the evolution of parameters, such as the level of environmental noise caused by vehicle traffic in urban environments, makes it possible to assess the impact of this type of measure. This paper presents a case study of the acoustic situation in Cáceres (Spain) during the restriction period by means of long-term acoustic measurements at various points of the city.

scholarly journals URBAN SCENE CLASSIFICATION USING FEATURES EXTRACTED FROM PHOTOGRAMMETRIC POINT CLOUDS ACQUIRED BY UAV

2019 ◽  
Vol XLII-2/W13 ◽  
pp. 511-518 ◽  
Author(s):  
G. G. Pessoa ◽  
R. C. Santos ◽  
A. C. Carrilho ◽  
M. Galo ◽  
A. Amorim
Keyword(s):  
Point Clouds ◽  
Bare Soil ◽  
Urban Environments ◽  
Data Sources ◽  
Classification Error ◽  
Error Matrix ◽  
Urban Scenes ◽  
Optical Images ◽  
Combining Data ◽  
Quantitative Analyses

<p><strong>Abstract.</strong> Images and LiDAR point clouds are the two major data sources used by the photogrammetry and remote sensing community. Although different, the synergy between these two data sources has motivated exploration of the potential for combining data in various applications, especially for classification and extraction of information in urban environments. Despite the efforts of the scientific community, integrating LiDAR data and images remains a challenging task. For this reason, the development of Unmanned Aerial Vehicles (UAVs) along with the integration and synchronization of positioning receivers, inertial systems and off-the-shelf imaging sensors has enabled the exploitation of the high-density photogrammetric point cloud (PPC) as an alternative, obviating the need to integrate LiDAR and optical images. This study therefore aims to compare the results of PPC classification in urban scenes considering radiometric-only, geometric-only and combined radiometric and geometric data applied to the Random Forest algorithm. For this study the following classes were considered: buildings, asphalt, trees, grass, bare soil, sidewalks and power lines, which encompass the most common objects in urban scenes. The classification procedure was performed considering radiometric features (Green band, Red band, NIR band, NDVI and Saturation) and geometric features (Height – nDSM, Linearity, Planarity, Scatter, Anisotropy, Omnivariance and Eigenentropy). The quantitative analyses were performed by means of the classification error matrix using the following metrics: overall accuracy, recall and precision. The quantitative analyses present overall accuracy of 0.80, 0.74 and 0.98 for classification considering radiometric, geometric and both data combined, respectively.</p>

scholarly journals UM ESTUDO DE CASO SOBRE A IMPLANTAÇÃO DE UM AMBIENTE DE SEGURANÇA DE REDES DE COMPUTADORES

2019 ◽  
Vol 9 (1) ◽  
pp. 119-139
Keyword(s):  
Network Management ◽  
Computer Network ◽  
City Hall ◽  
Demilitarized Zone ◽  
Local Areas ◽  
It Department ◽  
Secure Environment ◽  
Definition Of ◽  
The City

This paper presents a case study involving the deployment of a secure environment on the computer network at the City Hall in Palmeira das Missões - RS, throughout the definition of a physical and logical infrastructure, supported at concepts of management of computer networks and information security. Through the creation of Vlans (Virtual Local Areas Networks) and definition of DMZ (Demilitarized Zone) defined to achieve the level of security and network management required by the IT department, as well as provide greater reliability and integrity of information that travel on the network so that the users can perform their tasks more dynamically in a secure and agile environment. The main contribution of this case study was the implementation of a security and management in the computer network at the City Hasll in Palmeira das Missões – RS.

Smart Place Making Through Digital Communication and Citizen Engagement

2022 ◽  
pp. 1220-1237
Author(s):  
Angel Bartolomé Muñoz de Luna ◽  
Olga Kolotouchkina
Keyword(s):  
Information Technologies ◽  
Digital Communication ◽  
Urban Environments ◽  
Citizen Engagement ◽  
Urban Context ◽  
City Governments ◽  
Study Approach ◽  
New Information ◽  
The City

The disruptive growth of new information technologies is transforming the dynamics of citizen communication and engagement in the urban context. In order to create new, smart, inclusive, and transparent urban environments, the city governments of London and Madrid have implemented a series of innovative digital applications and citizen communication channels. Through a case study approach, this research assesses the best practices in the field of digital communication and citizen engagement implemented by London and Madrid, with a particular focus on the profile, content, and functions of these new channels. The results of this research are intended to identify relevant new dynamics of interaction and value co-creation for cities and their residents.

Urban wind resource assessment in changing climate: Case study

2016 ◽  
Vol 41 (1) ◽  
pp. 3-12 ◽  
Author(s):  
Djordje Romanic ◽  
Ashkan Rasouli ◽  
Horia Hangan
Keyword(s):  
Climate Change ◽  
Wind Energy ◽  
Resource Assessment ◽  
Urban Environments ◽  
Wind Resource Assessment ◽  
Changing Climate ◽  
Energy Maps ◽  
Wind Resource ◽  
The City

Urban wind resource assessment in changing climate has not been studied so far. This study presents a methodology for microscale numerical modelling of urban wind resource assessment in changing climate. The methodology is applied for a specific urban development in the city of Toronto, ON, Canada. It is shown that the speed of the southwest winds, that is, the most frequent winds increased for .8 m s−1 in the period from 1948 to 2015. The generated wind energy maps are used to estimate the influences of climate change on the available wind energy. It is shown that the geometry of irregularly spaced and located obstacles in urban environments has to be taken into consideration when performing studies on urban wind resource assessment in changing climate. In the analysed urban environment, peak speeds are more affected by climate change than the mean speeds.

scholarly journals Torontonians have a nature problem - can biophilic design be a solution?

2021 ◽  
Author(s):  
Megan Easton
Keyword(s):  
Design Research ◽  
Natural World ◽  
Urban Environments ◽  
Environmental Benefits ◽  
Case Study Analysis ◽  
Biophilic Design ◽  
Planning Framework ◽  
Economic Support ◽  
The City

Biophilic design stems from the term biophilia; a concept that describes humans’ innate connection and love for nature. It is an innovative way to bring nature into cities, reconnecting urban residents to the natural world through the built environment, while simultaneously contributing many mental, physical and environmental benefits. Despite extensive research on the significance of biophilic design, application in many urban environments, including Toronto, is minimal. This paper investigates what, if any, obstacles may be preventing Toronto from integrating biophilic design. Research was conducted through a literature review, case study analysis and four key informant surveys. It finds that there are obstacles to local implementation including a lack of supportive planning framework, a lack of economic support and incentives, lacking professional expertise and absent demand. The paper acknowledges the literature, case studies and informant responses through the provision of recommendations that are designed to help the city overcome these obstacles. Key words: Biophilia, Biophilic Design, Planning, Toronto

scholarly journals Using urban climate modelling and improved land use classifications to support climate change adaptation in urban environments: A case study for the city of Klagenfurt, Austria

Urban Climate ◽  
2020 ◽  
Vol 31 ◽  
pp. 100582 ◽  
Author(s):  
Sandro M. Oswald ◽  
Brigitta Hollosi ◽  
Maja Žuvela-Aloise ◽  
Linda See ◽  
Stefan Guggenberger ◽  
...  
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Climate Change Adaptation ◽  
Urban Climate ◽  
Urban Environments ◽  
Climate Modelling ◽  
The City

The Impact of Spatial Organization on Locating the Friday Mosques in the Traditional Islamic City-The Old Mosul City as a Case Study

2014 ◽  
Vol 71 (1) ◽  
Author(s):  
Faris A. Matloob ◽  
Ahmad B. Sulaiman
Keyword(s):  
Urban Space ◽  
Spatial Organization ◽  
Urban Environments ◽  
Urban Structure ◽  
Analytical Technique ◽  
People Movement ◽  
The Impact ◽  
The City ◽  
Early Islamic

Islamic city has its own character that distinguishes it from other urban environments. This is because it followed the Islamic ideology related to building the land. This led to that all cities built during early Islamic ages had followed the same principles in any part of the Islamic world. It is argued that the characteristics of the urban space configuration have a big role in making these cities successful environments. The key aspect in this matter is the distribution of land uses within the urban structure as it is directly associated with people movement and the distribution of their activities. The Friday mosques as the most important components of the Islamic city was located in a way that gave the city its own character. This study supposes that the distribution of the Friday mosques was affected by the way in which the urban space was configured. It aimed to find out to what extent this configuration influenced locating the Friday mosques in the urban fabric. Using space syntax as an analytical technique and the Old Mosul city as a case study, this research analyzed the spatial structure against several spatial characteristics with mosques locations to meet its goal.  

Realization of Effective Disaster Victim Support Through Development of Victim Master Database with Geo-Reference -A Case Study of 2007 Niigataken Chuetsu-Oki Earthquake-

2010 ◽  
Vol 5 (1) ◽  
pp. 12-21 ◽  
Author(s):  
Munenari Inoguchi ◽  
◽  
Keiko Tamura ◽  
Haruo Hayashi ◽  
◽  
...  
Keyword(s):  
Local Governments ◽  
Administrative Support ◽  
Work Flow ◽  
Disaster Victim ◽  
The People ◽  
Effective Manner ◽  
Victim Support ◽  
The Status ◽  
The City

Once a disaster occurs, local governments have a responsibility to provide many kinds of administrative support to the people affected. However, it is very difficult for local responders to get an understanding of the victims’ progress in rebuilding their lives because of the lack of a unified master database of information on the victims. In response to this issue, we aimed to design and develop such a master database, following the work flow of administrative supports. Based on this database, we also graphically represented the status of the progress victims were making in rebuilding their lives in GIS in the city of Kashiwazaki after the 2007 Chuetsu-oki Earthquake in Niigata Prefecture. As a result of this visualization, it was realized that local responders had provided support to the victims in an aggressive and effective manner.

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