Developing a city skyline for Hong Kong using GIS and urban design guidelines.
Abstract: Hong Kong Hong Kong (hŏng kŏng), Mandarin Xianggang, special administrative region of China, formerly a British crown colony (2005 est. pop. 6,899,000), land area 422 sq mi (1,092 sq km), adjacent to Guangdong prov. is a metropolis with a dense population. The need to cope with rapid population growth under the constraint of limited amounts of developable lands has resulted in a concentrated development of high-rises. Enterprising developers have clearly exploited such behaviors in the urban development of Hong Kong. Buildings have been constructed to maximum heights whenever a height restriction was not specified in the authorization to build, or stretched to their limits sideways if given a height restriction. Both of these situations have given rise to either repetitive and monotonous roofs-capes or walls of regimental building flanking the harbor front. The objective of this research is to evaluate and redesign the city skyline of Hong Kong based on Urban Design Guidelines established by the Planning Department. The study makes use of the Geographic Information System geographic information system (GIS)
Computerized system that relates and displays data collected from a geographic entity in the form of a map. The ability of GIS to overlay existing data with new information and display it in colour on a computer screen is used primarily to (GIS) technology and its 3-dimensional (3D) modeling functions to construct, assess, and analyze the city skyline.
The term "city skyline" refers to a profile of buildings that forms the cityscape (company) CityScape - A re-seller of Internet connections to the PIPEX backbone.
Address: CityScape Internet Services, 59 Wycliffe Rd., Cambridge, CB1 3JE, England. Telephone: +44 (1223) 566 950. in daytime and the silhouette at night (Lim and Heath 1993). It comprises a group of tall buildings against the undulating backdrop of mountains enwrapping in a natural setting. City skyline registers unique characteristics of a city's landscape shaped by planning controls, topographical conditions, commercial considerations, building design parameters, and environmental concerns. The cities of New York New York, state, United States
New York, Middle Atlantic state of the United States. It is bordered by Vermont, Massachusetts, Connecticut, and the Atlantic Ocean (E), New Jersey and Pennsylvania (S), Lakes Erie and Ontario and the Canadian province of , San Francisco San Francisco (săn frănsĭs`kō), city (1990 pop. 723,959), coextensive with San Francisco co., W Calif., on the tip of a peninsula between the Pacific Ocean and San Francisco Bay, which are connected by the strait known as the Golden , Sydney, Shanghai, and Toronto are among major metropolitan cities in the world with uniquely identifiable skylines.
Cities today are much more concerned about their images because a good impression is key to tourist attraction Noun 1. tourist attraction - a characteristic that attracts tourists
attractive feature, magnet, attractor, attracter, attraction - a characteristic that provides pleasure and attracts; "flowers are an attractor for bees" . Local governments of major cities have tried various means to enhance the visual quality of their city skylines by exerting more control over building heights and design parameters, as well as by constructing more green corridors (Council of the City Vancouver 1997; Lower Manhattan Lower Manhattan is the southernmost part of the island of Manhattan, the main island and center of business and government of the City of New York. Lower Manhattan is generally defined as the area delineated on the north by Chambers Street, on the west by the Hudson River (North Development Corporation 2002; United Kingdom Parliament 2003). The question is whether there are any standards to form judgment in our assessment of a city skyline. What criteria or factors are used to form an opinion about a city skyline? Are there objective methodologies to define these criteria?
Aesthetic value has emerged as an important criterion for evaluating the quality of a city skyline (Delafons 1990; Habe 1989; Preiser and Rohane 1988). A great deal of focus in aesthetic interests concerns the height or the design quality of a building. Some writers have attempted to quantify the design quality of buildings with associated preferences. Stamps (1991) investigated the influence of height, complexity, and style on the preference of individual buildings, and concluded that relative complexity is a predictor of preference for individual high-rise buildings. Heath, Smith, and Lim (2000) investigated the effects of the silhouette and facade complexity of tall buildings on visual preferences of skylines. They found that a higher level of preference, arousal, and pleasure usually is associated with a higher silhouette complexity and facade intricacy in·tri·ca·cy
n. pl. in·tri·ca·cies
1. The condition or quality of being intricate; complexity.
2. Something intricate: the intricacies of a census form.
Noun 1. .
There is general agreement that buildings should not be considered in isolation but in reference to their unique topographical and landscape setting (Planning Department HKSAR HKSAR Hong Kong Special Administrative Region 2001; Yu 2000; Bishop and Karadaglis 1997). Both man-made (including cultural and socioeconomic aspects) and natural (embracing mountains and waterbodies) contexts should exist coherently and in harmony with each another (Planning Department 2001). For instance, the skyline should preserve some view corridors or breezeways to mountain backdrops or natural landscapes. Open spaces or green corridors between buildings should be protected to yield a cityscape of characteristic traits and visual aesthetics.
This article outlines the criteria for skyline development and assessment in Hong Kong. It illustrates the use of 3D and viewshed analytical techniques of a GIS to visualize and practice Urban Design Guidelines. The study also proposes further recommendations to enhance the skyline of the Victoria Harbor along the waterfronts of the Hong Kong Island Hong Kong Island is an island in the southern part of Hong Kong, China. It had a population of 1,268,112 and its population density was 15,915/km² in 2006. The island was captured by the United Kingdom in the early 1840s, and the City of Victoria was then established on the island. .
The Skyline of Hong Kong
Hong Kong is blessed with a picturesque image along high hills overlooking the Victoria Harbor. This stretch of urban landscape is characterized with interestingly shaped high-rises set against a mountainous backdrop. Such a unique urban montage has become the image and identity of Hong Kong. Unfortunately, this beautiful vista has gradually been breached by uncontrolled high-rise developments along the harbor front (Figure 1). Many concerned citizens have protested that exceptionally tall buildings have blocked views of inland sceneries and landscapes. Planners have criticized that views from the harbor to the ridgeline ridge·line
Noun 1. ridgeline - a long narrow range of hills
arete - a sharp narrow ridge found in rugged mountains and the Peak have not been duly protected (Yu 1999; Tam and Hai 2001). Buildings in districts where height controls are enforced exhibit a uniform but monotonous roofscape, reflecting the widespread practice in urban construction that observes the maximum height as the literal cutoff. Tsim Sha Tsui Tsim Sha Tsui (Simplified Chinese 尖沙咀, Traditional:尖沙嘴), often abbreviated as TST, also known as Tsim Tsui (尖咀 or 尖嘴) by local people, is an urbanized area in the Yau Tsim Mong District in southern East (Figure 2) serves as a regrettable example that should be avoided at all cost. Sideward side·ward
adv. & adj.
Toward or at one side.
Adv. 1. expansion of buildings in these areas to compensate for reduced profits due to lower heights is extensive. This inclination has resulted in walls of building forming unattractive "canyons" flanking the waterfront.
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While vertical development is unavoidable in Hong Kong, it has been agreed generally that ridgelines are valuable tourist and visual assets, and their preservation should be given special consideration in the process of urban development. Moreover, one of many recommendations is to encourage height variation within the same area such that buildings along the coastlines should get progressively higher inland to produce a more interesting cityscape (Tam and Hai 2001). The terrace-like profile often produces magnificent skyline effect (Tam and Hai 2001). The Manhattan skyline in New York, for example, is regulated from two scenic viewpoints, located respectively at the Brooklyn Heights Promenade and the Victory Boulevard Victory Boulevard is a major thoroughfare on Staten Island, measuring approximately 8.0 miles (12.87 km) and stretching from the west shore community of Travis to the upper east shore communities of St. George and Tompkinsville. on the Staten Island Staten Island (1990 pop. 378,977), 59 sq mi (160 sq km), SE N.Y., in New York Bay, SW of Manhattan, forming Richmond co. of New York state and the borough of Staten Island of New York City. , where buildings are arranged in stepped-like profiles with taller developments located inland and lower structures along the waterfront. Another example is Shanghai, where buildings alongside the Huangpu River The Huangpu River (Simplified Chinese: 黄浦江; Traditional Chinese: 黃浦江; Pinyin: Huángpŭ Jiāng have undulating building heights that get progressively taller from the river. These city skylines exemplify that diversity in building heights adds variety and visual stimulus for the viewers. Serious consideration should be given to designating coastal sites for low-density developments. Sadly and contrary to sensible practices, the coastal strips of Hong Kong are packed with mega-towers obstructing the views of lower buildings located inland and behind them.
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Urban Design Guidelines
Barnett (1982, p. 12) defined urban design as "the process of giving physical design direction to urban growth, conservation and change. It sits at the interface between architecture and planning, and its emphasis on physical attributes usually restricts its scale of operation to arrangements of streets, buildings, and landscapes." Urban Design Guidelines have been articulated at both regional and local levels and published documents have extended the main ideas on city skyline and predominant built characters (Planning Committee planning committee n (in local government) → comité m de planificación 2002). In the United States United States, officially United States of America, republic (2005 est. pop. 295,734,000), 3,539,227 sq mi (9,166,598 sq km), North America. The United States is the world's third largest country in population and the fourth largest country in area. , Hamilton County Hamilton County is the name of a number of counties in the United States of America, named for Alexander Hamilton, first United States Secretary of the Treasury (except as indicated below):
Its western terminus is with Interstate 75. to Mehring Way, with stadiums pushing as far eastward or westward as possible. This approach has guaranteed that existing and future developments can enjoy the most prestigious positions along the riverfront. Similar guidelines were applied in Lower Manhattan to embrace a diversity of mass, building heights and configuration, and a variety of architectural styles (Lower Manhattan Development Corporation 2002). New buildings were carefully planned in consideration of view corridors and access to the waterfront (Bell et al. 2002). In the United Kingdom, city development guidelines for London were adopted as a framework to ensure that tall buildings are designed as part of a coherent whole informed by clear visions as opposed to ad hoc For this purpose. Meaning "to this" in Latin, it refers to dealing with special situations as they occur rather than functions that are repeated on a regular basis. See ad hoc query and ad hoc mode. , piecemeal, and reactive measures (Evans 2002). Tall buildings deemed detracting to the views, skyline, and townscape town·scape
1. The appearance of a town or city; an urban scene: "The high school . . . once dominated American townscapes the way the cathedral dominated medieval European cities" were encouraged to move and would be replaced by lower rise and contextual development compatible with the wider areas.
The Planning Department initiated a study on "Urban Design Guidelines for Hong Kong" with the first round of public consultation to collect opinions in February and March 2000. A second public consultation was arranged in 2002 to present the consultants' findings and to seek public views on the recommendations (Planning Department HKSAR 2002). Clearly-defined guidelines would help promote public awareness on design considerations besides providing a broad framework for urban design assessments. The study has provided many ideas on how to structure or improve the city skyline. It suggests that a good city skyline should exhibit the following qualities:
* Considers the relationships amongst buildings and between buildings and open space
* Takes into account the overall design of a city as a whole and its harmony with surrounding natural features such as ridgelines and peaks
* Enhances townscapes and local environments of quality character and interest
* Preserves the centrality of some buildings as the city's landmarks
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Height controls that were strictly enforced at one time exhibit a uniform but monotonous roofscape. Sideward expansion of buildings to maximize floor space in compensation for reduced profit margins due to lower heights is evident in this area.
The proposed guidelines also outline criteria and parameters deemed essential in augmenting the visual quality of a city's skyline. These include ridgeline protection, vantage positions, landmarks at strategic locations, and variation in building heights as discussed below.
Urban Design Guidelines of Hong Kong recommend that at least 20% of building free zone must be sustained against the backdrop of ridgelines from various viewing points (Figure 3). In effect, the contour of maximum building heights can be plotted against the ridgelines to ascertain compliance with this recommendation. New buildings, and particularly the mega-towers, are advised not to intrude upon the 20% building free zone.
The Urban Design Guidelines also recommend seven vantage points surrounding the Victoria Harbor that form the bases of preservation of views to ridgelines and peaks (Figure 4). Visual access from these vantage positions to the waterfront must be maintained at status quo [Latin, The existing state of things at any given date.] Status quo ante bellum means the state of things before the war. The status quo to be preserved by a preliminary injunction is the last actual, peaceable, uncontested status which preceded the pending controversy. or enhanced by providing additional view corridors. The aim is to allow visual permeability from the waterfront into the inner areas. This guideline would help develop a better microclimate microclimate
Climatic condition in a relatively small area, within a few feet above and below the Earth's surface and within canopies of vegetation. Microclimates are affected by such factors as temperature, humidity, wind and turbulence, dew, frost, heat balance, of the inner areas by facilitating air movement through breezeways.
Landmarks at Strategic Locations
The most recognizable cities in the world are often characterized by a number of towers rising from the ground. Mega-towers often have been selected as landmarks of a city, and they should be given special attention. These landmarks of certain heights should be introduced at suitable locations, such as at the harbor entrance or to mark a district. The threshold height at which a building is deemed a mega-tower is suggested at 300 meters or above from the ground level. The provision of mega-towers allows for special consideration of new structures so that their proposed locations must be evaluated against existing setting and their ultimate presence regarded not overly intrusive to maintain the visual coherence of the city.
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Variation in Building Heights
Variations in relief and building height will introduce a more vibrant and dynamic cityscape. The Urban Design Guidelines recommend that terraced-like arrangement of buildings be encouraged where appropriate. Taller developments should be located inland with lower structures closer to the waterfront. The recommendation illustrates with an example of a vertical profile between viewpoint VP1 and the Victoria Peak (as shown in Figure 5). The height of the Victoria Peak is around 545 meters, so that the 20% building free zone is approximately 110 meters below the Peak. The mark for the 20% building free zone is linked with VP1 to yield a line of maximum building heights that increases progressively from the waterfront.
Visualising Urban Design Guidelines In A GIS
GIS has been used extensively in many 3D applications (He and Tsou 2001; Zhang et al. 2000; Batty et al. 2000). It has been shown a practical means to aid decision making and terrain modeling. The 3D-Analyst extension of ArcView (ESRI (Environmental Systems Research Institute, Inc., Redlands, CA, www.esri.com) The world's leading developer of geographic information systems (GIS) software, including programs that plot ZIP codes and addresses, demographic information and detailed, color-coded data. 1997) was employed here to convert a portion of the Hong Kong maps in 2D representation into 3D models. Two functions were particularly helpful in this regard: (1) 3D visualization functions and (2) 3D analytical tools. The former permits integration of an orthophoto image and a 2D map to construct a more intuitive model of the same area in 3D perspective. 3D representation, as illustrated by the cross-sectional profile in Figure 5, enables graphic presentation of the 20% building free zone against the ridgelines such that buildings in violation can be manifested. The 3D analytical tools, on the other hand, support visibility analyses (Figure 6) to examine if a given target is viewable from a point of observation (i.e., the line-of-sight check) and to determine the extent of visible areas from an observation point (i.e., the viewshed inspection).
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Both non-spatial and spatial data Data that is represented as 2D or 3D images. A geographic information system (GIS) is one of the primary applications of spatial data (land maps). See spatial analysis, spatial resolution and GIS glossary. were used in the 3D modeling and design of the Hong Kong skyline. The Lands and Planning Departments of Hong Kong provided spatial/map data for this study. Building or storey heights were gathered from various sources and incorporated with the spatial data. Orthophotos were also acquired from the Lands Department to provide a realistic backdrop for our skyline profiles.
The following is an account of our attempts to incorporate Urban Design Guidelines with GIS functions to examine skyline development of Hong Kong at the Victoria Harbor. Specifically, we demonstrated how GIS modeling capabilities have enabled the visualization and understanding of Urban Design Guidelines.
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Procedure 1: 2D Data Compilation and Selection of Landmarks
We began by superimposing a layer of building polygons over an orthophoto image of the Victoria Harbor (Figure 7). We then identified prominent landmarks or mega-towers exceeding 300 meters in heights, as specified in the proposed Urban Design Guidelines of Hong Kong. The recognition of these mega-towers is fundamental to assessing their visual prominence and impacts on the urban scenes.
Procedure 2: 3D Representation of a Cityscape
A 3D illustration bears a closer resemblance of the location it represents and enhances visualization of the landscape and its associated features. GIS modeling functions were used to create a 3D urban scene of the Victoria Harbor (Figure 8). The 3D urban scene shows the Victoria Harbor front overlooking the Hong Kong Island, with landmark buildings highlighted in yellow. The natural topography is shown as a backdrop to offer contrast in the elevation and enhance realism of the display. The procedure started off by erecting buildings over a terrain. These vertical structures were then shaded in different colors to mark their geographic subdivisions (whether located in Kowloon or Hong Kong Island) and unique characteristics (whether or not a landmark building). While Figure 6 is a static manifestation of a screen shot, the GIS platform actually supports an interactive operational setting to maneuver the 3D urban model from any direction, angle, or zoom level. Such flexibilities heighten exploration and review of Urban Design Guidelines from various perspectives, as exemplified in the discussions that follow.
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Procedure 3: Visibility and Viewshed Analyses Visibility and viewshed analyses are perhaps the most significant functions of GIS modeling in this study. The procedure allows the specification of a vantage point whereupon an examination of its view corridors to the ridgelines as stipulated in the Urban Design Guidelines can be conducted. Figure 9 shows the results of the viewshed analysis from three vantage points located in Kowloon (VP1, VP2, and VP3). The visible areas were derived with the assumption that the observer was 1.6 meters above sea level Meters Above Sea Level is a standard metric measurement of the elevation of a location in reference to mean sea level. Uses
Meters above sea level is the standard measurement of the elevation or altitude of:
Procedure 4: Line-of-Sight Analysis
The line-of-sight tool permits a test of visibility between a pair of pre-set points representing a viewing position and a target object. This GIS function augments visibility analysis in situations where specific target objects for viewing have been identified. A line is drawn to link the pair of points and visibility between them is not established if one or more obstacles (usually tall buildings) exist along the line of sight. Figure 10 shows that Mount Parker Mount Parker can refer to:
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Figure 11 illustrates with a 3D model the line of sight between VP1 and the Victoria Peak. Given the Urban Design Guidelines as explained in Figure 5, we can identify with some degree of certainty existing buildings that have violated the recommended building heights and infringed upon the 20% building free zone. As new buildings are expected to develop in this area in the future, the line-of-sight analysis is potentially useful in recommending or enforcing more flexible and dynamic building heights. In this way, progressively taller buildings can be staggered to provide more visual stimulus from the waterfront toward the ridgelines. The terraced approach should improve visual penetration into the inland areas to reveal greenery and other heritage artifacts.
Procedure 5: Cross-Sectional Analysis
A cross-sectional display emphasizes depths such that structures/ features in the foreground are clearly distinguishable from those at a distance. The 3D model supports cross-sectional drawings of the harbor front to facilitate a perspective view of interacting and counteracting elements (Figure 12).
Figure 12A is a cross-sectional view from the Harbor to ridgelines of the Hong Kong Island. Some of the mega-towers (such as the Central Plaza, China Bank, and the Centre) have been highlighted to contrast their existence against surrounding buildings. It is also evident that building profiles to the left of the Central Plaza project a relatively flat and monotonous roofscape.
Figure 12B highlights existing silhouette of the city along with the line that delineates the 20% building free zone. It is apparent that some of the mega-towers (such as the Central Plaza, China Bank, and the Centre) have obviously intruded upon the 20% building free zone. The figure also illustrates view corridors to Mount Butler, Jardine's Lookout, Mount Cameron, Mount Gough Mount Gough (Chinese: 歌賦山) is a hill on Hong Kong Island, Hong Kong. It is east of Victoria Peak. It peaks at 370 m (1214 ft) above Admiralty. , and the Victoria Peak. These hills that overlook the Victoria harbor are said to broaden people's spatial perception and make the harbor appear perceptually larger than its physical coverage. They also promote the identity of the city by providing "visual cues" to the people. Given their significance in complementing and contributing to vistas of the Harbor, the preservation of these ridgelines should be given unique consideration in the process of skyline development.
Some lower structures along the waterfronts of Sheung Wan, Wan Chai, and Causeway Bay are discernable from Figure 12C. Urban Design Guidelines suggest more variation in building heights to yield a terraced arrangement. It can be seen here that the diversified building heights in the Causeway Bay area does heighten the perception of depths resulting in a higher silhouette complexity, marred only by the monotonous roofscape at the far end. It is also clear that there is room in developing a more spectacular and dynamic skyline of Hong Kong as illustrated in Figure 12D.
This paper has demonstrated that GIS can operationalize recommendations subscribed by the Urban Design Guidelines. For example, the government of Hong Kong The Government of the Hong Kong Special Administrative Region of the People's Republic of China (Traditional Chinese: 中華人民共和國香港特別行政區政府 has identified seven viewpoints for the preservation of view corridors to important peaks given a strong appeal from the public to heighten protection of views to the ridgelines. Our study has shown that some of the designated viewpoints do not allow a deep penetration with extensive visual scopes because a few excessively tall buildings have blocked or extracted the views.
Urban Design Guidelines of Hong Kong volunteers a systematic approach to the design of its urban skyline. Some recommendations are quantitative in nature, and these can be accommodated readily in a GIS. Specifically, the 3D models constructed with a GIS can aid in the following aspects: (1) to identify violation cases, (2) to assess the preservation of views, and (3) to suggest possible areas of improvement.
The Urban Design Guidelines recommend that buildings should exist in harmony with surrounding natural features such as ridgelines and peaks. Violation cases are discernible through both visual and attribute examinations. The 3D GIS visualization affords viewing perspectives from almost every direction to determine the extent to which a built structure has infringed upon the restricted zones or the combined impact a collection of structures has on the surrounding townscape. The attribute functions can validate and pinpoint structures exceeding the 300 meter threshold in building heights or those suspected of sideway expansion. The Urban Design Guidelines also encourage the preservation of view corridors and breezeways to prominent features along the ridgelines to yield a cityscape of characteristic traits and visual aesthetics. In this regard, GIS endorses the visibility analyses along a given line of sight or across the entire viewshed. These utility functions make possible an overview of what obstructions there are and which features are visible or hidden from a given vantage point. In line with practices of cities like Manhattan, Shanghai, and London, the Urban Design Guidelines also advocate stepped-like buildings to provide visual set-backs from major parks, waterfronts, or principal roads. GIS allows the plotting of vertical or cross-sectional profiles to suggest indicator lines for controlling building heights that increase gradually from the waterfront to the city's interior. Along with violation cases and considerations in the preservation of views, elements deemed unattractive or undesirable in a townscape should be blacklisted for future replacement by more amenable structures when opportunity arises.
We believe that GIS can be an effective support tool to coordinate control measures for building heights. We further believe that GIS provides a means to engage the Government and the public in fruitful discussions toward the creation of a more spectacular and impressive skyline of Hong Kong. It is noteworthy that many recommendations of the Urban Design Guidelines (such as the introduction of more open space and greenery to the cityscape, massing the building through architectural design, and the preservation of heritage buildings, etc.) were not examined in this paper. We hope to address these areas in future research. Our initial study has proved that GIS is an enabling technology and a support tool for better decisions and more comprehensive planning.
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See also Berzerkley, BSD.
Note to British and Commonwealth readers: that's /berk'lee/, not /bark'lee/ as in British Received Pronunciation. .
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Dr. Ann Shuk-han MAK Mak
Falstaffian figure; categorically maintains his innocence. [Br. Lit.: The Second Shepherds’ Play]
See : Deceit
sheep stealer succeeds by waiting till the shepherds fall asleep. [Br. Lit. is an Honorary Lecturer in the Department of Geography of the University of Hong Kong The University of Hong Kong (commonly abbreviated as HKU, pronounced as "Hong Kong U") is the oldest tertiary institution in Hong Kong. Its motto is "Sapientia et Virtus" in Latin, and " . Her research interests are in the areas of geographic information systems, in particular 3D urban modeling.
Ann Shuk-Han Mak
Department of Geography
The University of Hong Kong
Hong Kong SAR, PR China
Mr. Ernest Kin-Man Yip has been an Assistant Project Manager for a number of projects, including landscape and urban, urban planning, and comprehensive development projects. He has particular expertise in combining urban design and GIS skills in development planning and design.
Ernest Kin-Man YIP
Flat D, 20/F., Tower 11
Vista Paradiso, Ma On Shan Ma On Shan (Traditional Chinese: 馬鞍山) may refer to the following places in Hong Kong, China:
Hong Kong SAR, PR China
Dr. Poh-Chin LAI LAI Leaf Area Index
LAI Lean Advancement Initiative (MIT)
LAI Lean Aerospace Initiative
LAI Long-Acting Injection
LAI Lambda Alpha International (honorary land economics society) has been a Senior Lecturer/Associate Professor in the Department of Geography of the University of Hong Kong since 1993. She is also Honorary Deputy Director of the Geographical/Land Information System Research Center of the same university.
Department of Geography
The University of Hong Kong,
Hong Kong SAR, PR China