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Most of cities in the world like Shanghai have a large number of underground facilities including public transport and commercial facilities such as shopping malls, subway, parks, etc. The safety of underground spaces has become a very important aspect of urban safety. Underground facilities are very much vulnerable to waterlogging disasters. Urban waterlogging disasters have been causing havoc to...
Compared to 2D navigation, 3D navigation requires much better performance of locating and heading. In an urban environment, the signals from a built-in GPS on a smart phone are always so weak that it causes considerably low position and heading accuracy. To address this issue and improve the user experience, two contexts, Navigation and Look-Around, are defined in 3D personal navigation. The following...
In this paper, we study the methods of constructing place-name ontology of Beijing based on attribute properties and spatial relation properties of place-name entities from the perspective of spatial cognition. Firstly, we locate place-name entities in the coordinate frame of Beijing city qualitatively and define the concept of place-name entities combining with the types of them. And then select...
With the development of the city and the increasing personal cars, the parking difficulty has been a general problem in the urban traffic. Some Urban Parking Guidance Systems (UPGS) have been established that contain roadside changeable message boards. However, those general UPGS can't provide personalized services, can't combine with the electronic map, can't show enough information. Additionally,...
In this paper, we present a new method for dynamically profiling land use pattern and generating Origin-Destination matrices from millions of individual mobile phone traces. It is based on analyzing individual anonymzed mobile phone call records. Starting from these records, we systematically analyze the different signals received from the cell phone towers and identify the key feature associated...
The article tries to apply the hierarchical location theory to traditional Location-allocation model to form a dynamic hierarchical location model. This model considers the rating of bank outlet and the influence of population redistribution caused by land use alteration after the urban extension. The case research of the downtown in Kunming indicates that it has certain advantage in simulating the...
Research of global climate change has an urgent need for the distribution of CO2 emissions with high spatial resolution. Traffic is an important carbon source in the urban development. Real-time data collected by the Intelligent Traffic System (ITS) plays a more and more significant role in the CO2 spatial-temporal distribution data production. However, the amount of data is so large that the data...
Shanghai which is China's largest economic center has also gradually integrated into the global city network since 1978. We use mapinfo to analyze the location of 1086 office buildings in Shanghai downtown. Shanghai as an emerging global city has formed a polycentric mode of producer services. Quantitative researches show that industrial restructuring and expansion of producer services have significant...
Recently, urban sprawl becomes common phenomenon overseas and in domestic. Urban sprawl is a discontinuous development pattern and impacts on environment, economic and social aspect, including landscape fragmentation, species decrease, bio-diversity decrease and habitat destruction. Many researches indicate the relationship indeed exists between transportation accessibility and urban sprawl. The raise...
Most of the information stored in web pages contains geographic context, such as place names, address, and coordinates. Such geographic information often contains great values and is worth retrieving and analyzing. Traditional search engine is limited in its capability of extracting meaningful geographic messages from mass of unstructured and textual source. Even with the retrieved geographic information,...
Through applying spatial statistical analysis, Geographical Weighted Regression (GWR) model and GIS technology, this study aims at finding the relationship between the effects of various factors and spatial distribution of residential house price. The traditional regression models are reviewed firstly, the model without the consideration of spatial characteristics cannot reach very nice precision...
This paper focuses on the detection of land cover change in Beijing using TM data collected on 22 May, 2002 and 20 May, 2010 respectively. For detailed analyzing the land cover change in different parts of Beijing, the central Beijing enclosed by fifth ring road was divided into 4 areas based on the ring roads. After image registration, mask and image clip, sample data of land cover types as water...
Based on cellular automata, this article proposes a new method of simulating changes in Chinese Northeastern agricultural landscape. This case study in Dehui, China illustrates that natural and human factors are the main drivers of landscape transition. The model is controlled macroscopically by natural and policy factors. A set of principles are generated derived from a former remote sensing data...
Road line type identification is very important in collecting and processing road information. This paper introduces an algorithm of rod line type identification based on cubic spline function, Random Hough Transform, the method of selecting weight iteration based on LS-TLS, and Condition Adjustment with parameters. The algorithm goes as follow. Firstly, we acquire road centerlines coordinates from...
The paper proposes a directed graph model and the selection of appropriate network metrics, the proposed method simulates the city traffic network. Detailed analysis of the traffic flow can be used to derive the volume changes in the city road network. The application of classical graph theory algorithm and transport engineering method makes it feasible to quantify and compute the relationship between...
Landsat TM images of the Pearl River Delta taken in 1988, 1998 and 2006 are used to explore the Construction land Expansion and the Influence of Site Factors. The expansion shows the characteristics of gathering on plains and along major roads and coastlines in both periods from 1988 to 1998 and from 1998 to 2006. Several site factors, including landscape types and the distance from roads, coastlines,...
This paper investigates the effects of land's proximity to river at a distance of 200 meters on land prices in Tokyo metropolitan Area (TMA) using Geographic Information System (GIS). Line Density Function was employed to estimate the effects of distance and Geographically Weighted Regression (GWR) was applied for assessing the effects of land's proximity to river. The result of GWR demonstrated that...
This paper focuses on the design and development of Municipal Facilities Management System (MFMS). Street images and videos were collected by Wuhan LD2000-R Mobile Mapping System, and real-time videos on site under emergency conditions were captured by Wireless Transmission System. In MFMS, any street can be queried and located, visual information of facilities on the streets can be viewed, as well...
The paper proposes one space-time version of network K-function for detecting space-time distribution pattern of incidents occurring on road network. It extends existing network K-function for purely network space point process data to the network space-time setting. Two Monte Carlo simulations are implemented in the experiment, one is to detect space-time clustering of load-unload points, and the...
This paper studied temporal and spatial changes of Urban Heat Island Effects (UHI) in Chengdu City, Sichuan Province of China, using LandSat ETM+/TM data. Urban Black-body Temperature (TBB) was obtained. The findings are showed as follow: (1) UHI is extremely remarkable within the Third Ring Road of Chengdu City. (2) In terms of spatial changes, in 1988, the high temperature zone mainly occurred in...
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