Development of an urban landcover classification scheme suitable for representing climatic conditions in a densely built-up Asian megacity

Eum, Jeong-Hee; Scherer, Dieter; Fehrenbach, Ute; Woo, Jung‐Hun

doi:10.1016/j.landurbplan.2011.08.010

Cited by 24 publications

(14 citation statements)

References 28 publications

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“…However, these values are set based on urban structure characteristics of average German cities. Therefore, the present study applied coefficient of friction and cold air generation rate reflected the characteristics of Korean city structures [11,33]. As for temperature difference and zero-plane displacement height, the values provided in the KALM model were used.…”

Section: Analysis Of the Cold Airflow And Altitude Of The Cold Air Layermentioning

confidence: 99%

Management Strategies of Thermal Environment in Urban Area Using the Cooling Function of the Mountains: A Case Study of the Honam Jeongmaek Areas in South Korea

et al. 2018

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The aim of this study is to suggest planning strategies for managing comfortable thermal environments in urban areas by local cold air generated in mountains, which finally contributes to making sustainable and eco-friendly cities. For this purpose, we selected urban areas in the Honam Jeongmaek in Korea and analyzed the nighttime cold airflow and altitude of the cold air layer generated in mountains, by using the KALM (Kaltluftabflussmodell) model which calculates the amount of cold air generated during the nighttime without winds. The results of analysis found that the local airflows generated in Mt. Chuwol, Mt. Mudeung, Mt. Cheonun, Mt. Byeongpung and Mt. Geum influenced the entire study site from across Gwangju Metropolitan City to adjacent areas. Therefore, the mountains generated major cold airflows should be designated as the management area for securing cooling function. As a result of detailed analysis, most developed areas, such as Buk-gu, Seo-gu and Nam-gu, as well as industrial areas, did not have a smooth flow, so management strategies were needed. In particular, Mt. Mudeung and Mt. Cheonun were the source areas of the local cold air generation and the generated flows from the mountains could influence into developed areas of Gwangju Metropolitan City. Thus, thorough preservation policies are required for Mt. Mudeung and Mt. Cheonun from development that causes damages to mountainous terrain and topography. This study could support the establishment of systematic management plans of the Honam Jeongmaek in preparation for climate change. In addition, it is expected to be used to develop policies related to the quantitative expansion of mountain areas with cooling functions and the conservation of sustainable mountain areas.

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Section: Analysis Of the Cold Airflow And Altitude Of The Cold Air Layermentioning

confidence: 99%

Management Strategies of Thermal Environment in Urban Area Using the Cooling Function of the Mountains: A Case Study of the Honam Jeongmaek Areas in South Korea

et al. 2018

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“…To rapidly and efficiently map urban areas, various kinds of automatic classification methods are used, that are usually adopted [39,40]; however, they are more difficult to apply in large urban areas because of the massive amount of adjustments required for the parameters as opposed to the visual interpretation method. Moreover, the visual interpretation method has advantages in scientifically recognizing how other land use types convert to urban lands [41,42].…”

Section: Data Processingmentioning

confidence: 99%

Forms of Urban Expansion of Chinese Municipalities and Provincial Capitals, 1970s–2013

2016

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Urban expansion form is the most direct manifestation of urban expansion in space. Although it has been widely and vigorously studied, relatively little attention has been paid to reveal its spatiotemporal characteristics at the administrative level over a long timeframe. In this study, 31 Chinese municipalities and provincial capitals were selected as subjects to identify the urban expansion forms of provincial and higher level cities in China. First, urban expansion processes of these cities in the past four decades were reconstructed using remote sensing and geographical information system (GIS) technology. Then, the overall characteristics of urban expansion were presented to scientifically determine the urban expansion forms of the provincial and higher level cities in China. Afterwards, the annual expansion area per city (AEAC) index was employed to describe the urban expansion processes and determine the important time nodes of the 31 cities. Lastly, the urban expansion type (UET) index was adopted to analyze the spatiotemporal characteristics of urban expansion forms. Results indicate that (1) from the 1970s to 2013, urban lands in provincial and higher level cities in China expanded dramatically, with the central built-up area increasing by over 5 times, and urban expansion demonstrating an apparent spatial difference. The expansion rate of cities in East China was fastest with an AEAC of 13.78 km 2 , followed by that in Central China (AEAC = 9.67 km 2 ). The urban expansion rate was slowest in West China (AEAC = 7.11 km 2 ); (2) Affected by the national macro policies, urban expansion processes successively experienced four different stages: a slow expansion period (1970s-1987), an accelerating expansion period (1987)(1988)(1989)(1990)(1991)(1992)(1993)(1994)(1995), a slowdown expansion period (1995)(1996)(1997)(1998)(1999)(2000), and a high-speed fluctuating expansion period (after 2000); (3) The urban expansion forms of municipalities and provincial capitals were mainly edge-expansion supported by infilling expansion. The leapfrog form contributed minimally to urban expansion; (4) The edge-expansion form surged before 2010 and gradually slowed down after 2010. By contrast, infilling expansion kept increasing in the past four decades. Lastly, the rate of urban expansion via the leapfrog form fluctuated from the 1970s to 2013.

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“…The powerful functions of GIS technology provide convenient means to analyze urban expansion data and relevant auxiliary data (Wu et al, 2006;Ram and Kolarkar, 2007;Ma and Xu, 2009). Local and international remote sensing monitoring of urban expansion mostly adopt the automatic classification method (Jacquin et al, 2007;Doxania et al, 2011;Eum et al, 2011). However, the influences of the self-characteristics of remote sensing data, the information complexity of urban land, and the limited image processing techniques currently available lead to the poor universality of this method in extracting information on urban land at the regional scale.…”

Section: Introductionmentioning

confidence: 99%

Spatial differences of coastal urban expansion in China from 1970s to 2013

et al. 2015

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As the ′economic engines′ of China, coastal cities have developed and expanded considerably since the 1970s. In this study, information on the urban expansion process of Chinese coastal cities from the 1970s to 2013 was retrieved. Through the analysis of stage characteristics, spatial expansion modes, influences on land use, centroid shifts, and spatial morphological evolutions, the spatial differences of coastal urban expansion were revealed. Results indicate that 1) the expansion stages of southern coastal cities are more complex than those of northern coastal cities, and the expansion ranges and speeds of the former are far higher than those of the latter; 2) the spatial expansion of southern coastal cities mostly adopt a single mode, whereas northern coastal cities mostly adopt a mixed mode; 3) significant spatial differences in the occupations of different land sources exist between the south and the north along the coastline; 4) the centroid of coastal cities tends to migrate toward the coastline, and the centroid shift distances of southern coastal cities are clearly higher than those of northern coastal cities; and 5) the spatial morphology of southern coastal cities tends to be compact, whereas that of northern coastal cities tends to be loose. Policies have a powerful significance in terms of guiding urban expansion and its spatial differences in coastal cities. Urban expansion in coastal cities will encounter new opportunities and challenges under the guidance of new types of urbanization strategies.

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Development of an urban landcover classification scheme suitable for representing climatic conditions in a densely built-up Asian megacity

Cited by 24 publications

References 28 publications

Management Strategies of Thermal Environment in Urban Area Using the Cooling Function of the Mountains: A Case Study of the Honam Jeongmaek Areas in South Korea

Management Strategies of Thermal Environment in Urban Area Using the Cooling Function of the Mountains: A Case Study of the Honam Jeongmaek Areas in South Korea

Forms of Urban Expansion of Chinese Municipalities and Provincial Capitals, 1970s–2013

Spatial differences of coastal urban expansion in China from 1970s to 2013

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