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Planning for underground spaces has become an effective way to use central areas in cities given the steady economic growth in China. The development of underground spaces in mountainous cities has satisfied the needs of the diversification of the city commercial areas and pedestrian movement. Safety issues exist because these underground spaces were originally used for civil air defense. This study was based on the underground commercial street in Chongqing, which is a typical mountainous city. Based on the results of combined fieldwork and survey, this paper summarized current safety issues, which include the not-fully-open exit, the imbalanced exit location, blocked evacuation routes, and the poor awareness of the potential safety issues. This paper proposed a framework of the safety factors for the underground space and synopsized prevention strategies that are specific to potential disasters in the underground environment. The framework comprises ensuring that the exits are fully open, the underground corridors are kept unblocked, the open space on the street is increased for disaster prevention, and equipment security is maintained and managed. At last, This paper summarized disaster prevention strategies, which include ensuring unimpeded exits, balancing the locations of the exits, avoiding blocks, increasing the disaster prevention square area in the underground space, maintaining and managing the security of the equipment.

Due to land resource scarcity, sustainable urban development in high-density cities has long been challenging. As such, many cities are formulating plans to “dig deep”, resulting in more citizens working and/or staying underground for longer periods of time. However, owing to the particularities of underground space, the factors involved in the creation of a healthy environment are different from those involved in aboveground developments. This study thus aims to investigate the influences of various underground environment factors on users' health through a holistic approach.

To achieve this aim, 12 underground sites and 12 corresponding aboveground sites are selected for a large-scale questionnaire survey, resulting in 651 survey samples. The survey covers post-occupancy evaluation of health (physical and psychosocial), underground environmental quality (visual, thermal, acoustic comfort, indoor air quality and ventilation), space design and greenery. Independent-sample T-test, Pearson correlation, multiple regression modelling and structural equation modelling are used to investigate whether significant differences exist between health of underground and aboveground users, and to develop an underground environment-health model for unveiling the significant associations between underground environment factors and users' health. To cross validate the results, an objective field measurement study is further conducted on six underground sites. The objective measurement results are used to cross validate the survey results.

The questionnaire results provide the following evidence: (1) health of underground users is significantly poorer than that of their aboveground counterparts; (2) underground development users' health is significantly affected by space design, greenery and environmental quality in terms of thermal comfort, indoor air quality, ventilation and acoustic comfort but not visual comfort; and (3) amongst the various identified factors, space design has the strongest predicting effects on human health. The field study echoes the survey findings and further unveils the relationships between different environmental factors and human health.

The results shed light on the importance of distinguishing between underground developments and aboveground ones in various guidelines and standards, especially those related to space management.

The purpose of this paper is to investigate the underground levels of a city to explore how vernacular and historic underground urban facilities help traditional cities to be sustainable. Therefore, the authors look at how culture, climate and economy affect those facilities.

The paper focuses on vernacular and local underground urban facilities in historic cities to find more sustainable processes of urban development that integrate cultural, climatic and economical concerns into design planning. The paper is based on a case study of the underground infrastructure of Dezful, Iran.

There are several vernacular building styles around the world, especially in Iran, with different shapes, materials, arrangements and concepts. Building construction has significant impacts on the environment and natural resources. Dezful is a city in Iran with a lot of potential in terms of its architecture. Vernacular cities possess infrastructure that helped them thrive in harsh climates. For instance, Dezful takes advantage of a systematic infrastructure termed the “Underground City.”

The traditional architecture of Dezful plays an important role in creating underground spaces, especially urban and architectural elements with thermal isolation properties that can be used as housing and as food storage. In this century, building construction could adopt these environmental properties, which could lead to low energy consumption in urban environments. Considering traditional and contextual elements in urban planning and design could revive sustainable community practices in urban environments.

The purpose of this study is to designed a robot odometry based on three dimensional (3D) laser point cloud data, inertial measurement unit (IMU) data and real-time kinematic (RTK) data in underground spatial features and gravity fluctuations environment. This method improves the mapping accuracy in two types of underground space: multi-layer space and large-scale scenarios.

An IMU–Laser–RTK fusion mapping algorithm based on Iterative Kalman Filter was proposed, and the observation equation and Jacobian matrix were derived. Aiming at the problem of inaccurate gravity estimation, the optimization of gravity is transformed into the optimization of SO(3), which avoids the problem of gravity over-parameterization.

Compared with the optimization method, the computational cost is reduced. Without relying on the wheel speed odometer, the robot synchronization localization and 3D environment modeling for multi-layer space are realized. The performance of the proposed algorithm is tested and compared in two types of underground space, and the robustness and accuracy in multi-layer space and large-scale scenarios are verified. The results show that the root mean square error of the proposed algorithm is 0.061 m, which achieves higher accuracy than other algorithms.

Based on the problem of large loop and low feature scale, this algorithm can better complete the map loop and self-positioning, and its root mean square error is more than double compared with other methods. The method proposed in this paper can better complete the autonomous positioning of the robot in the underground space with hierarchical feature degradation, and at the same time, an accurate 3D map can be constructed for subsequent research.

This chapter estimates how minimum parking requirements increase the cost of constructing housing, office buildings, and shopping centers. It also explains proposed legislation to limit how much parking cities can require in transit-rich districts.

I assembled data on the cost of constructing office buildings, shopping centers, and parking spaces in eight American cities, and data on the minimum parking requirements in these cities. I then combined the parking construction costs with the number of required parking spaces for each land use to estimate how the minimum parking requirements increase development costs for office buildings and shopping centers.

Minimum parking requirements increase the cost of constructing a shopping center by up to 67 percent if the parking is in an aboveground structure and by up to 93 percent if the parking is underground.

In suburban Seattle, parking requirements force developers to spend between $10,000 and $14,000 per dwelling to provide unused parking spaces.

On a typical construction site in Los Angeles, parking requirements reduce the number of units in an apartment building by 13 percent.

To mitigate the high costs imposed by minimum parking requirements, California is considering legislation to set an upper limit on how much parking cities can require in transit-rich districts: no more than one space per dwelling unit or two spaces per 1,000 square feet (93 square meters) of commercial space. This legislation would limit parking requirements, but it would not limit the parking supply because developers can always provide more than the required number of spaces if they think demand justifies the added cost.

This chapter measures how minimum parking requirements increase the cost of housing, office buildings, and shopping centers in order to subsidize parking. Urban historians often say that cars have changed the city, but urban planning has also changed the city to favor cars.

Underground space is a valuable commodity — no less valuable because it is largely unseen. This space is especially valuable in towns and cities where land values are at a premium. The need for a study of these tracts below street level is becoming increasingly urgent, if only to assess the true value of this capital vested underground. Perhaps equally important to our consideration of it are the long term prospects for the vast service network buried beneath our cities.

By engaging in critical literacy, participants theorized Blackness and antiblackness. The purpose of this study was to have participants theorize Blackness and antiblackness through their engagements with critical literacy.

The authors used a youth-centered and informed Black critical-race grounded methodology.

Participants’ unique and varied revelations of Blackness as Vitality, Blackness as Cognizance and Blackness as Expansive Community, served to withstand, confront and transcend encounters with antiblackness in English curricula.

This paper provides a model for how to engage Black youth as a means to disrupt anti-Black English education spaces.

This study provides a foundation for future research efforts of Black English outer spaces as they relate to English education. Findings in this study may also inform existing English educator practices.

This study theorized both the role and the flexible nature of Black English outer spaces. It defined the multi-ethnic nature of Blackness. It proposed that affirmations of Blackness sharpened participants’ critical literacies in Black English outer spaces as a transformative intervention to anti-Black English education spaces.

This paper aims to examine unexpected arrivals of adult-oriented digital media in the playful storied environments of Grades 1 and 2 classrooms and the possibilities such unsettling literacies may offer.

Posthuman perspectives provide this study’s theoretical grounding and methodological approach. Actor-network-theory and thinking with theory are used to examine school play with two video games and the literacies entangled in children’s same game machinima productions.

Explorations of transmediascapes animate entangled meaning-making practices across virtual and material childhood spaces. They provide openings for educators to understand their students’ literate world-making and consider how those unsettling literacies might have a place in the classroom as generative rather than to-be-avoided contaminations.

The theoretical and methodological engagements of this paper offer opportunities to re-consider unsettling literacy encounters as generative contaminations rather than noxious intrusions. This paper shows how, in engaging with unsettling literacies, educators may participate with children in meaningful literacy practices responding to both the tantalizing and the troubling aspects of particular transmedia.

The following classified, annotated list of titles is intended to provide reference librarians with a current checklist of new reference books, and is designed to supplement the RSR review column, “Recent Reference Books,” by Frances Neel Cheney. “Reference Books in Print” includes all additional books received prior to the inclusion deadline established for this issue. Appearance in this column does not preclude a later review in RSR. Publishers are urged to send a copy of all new reference books directly to RSR as soon as published, for immediate listing in “Reference Books in Print.” Reference books with imprints older than two years will not be included (with the exception of current reprints or older books newly acquired for distribution by another publisher). The column shall also occasionally include library science or other library related publications of other than a reference character.