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Based on virtual simulation platform, taking the virtual reality and three-dimensional simulation technique as the core technology, and using the entire digital photogrammetry, GIS, multimedia information and web network technology, this paper puts forward the technique by which we can set up a three-dimensional virtual scene of garden museums with Zhuozhengyuan virtual garden museum as an example...
A decision tree is an analysis skill and a classification algorithm, whose basic principle is the combination of probability theory and an analysis tool of tree shapes. It derives a hierarchy of partition rules with respect to a target attribute of a large dataset. Nowadays, concrete coordinates exist in lots of datasets, which leads to the spatial distribution of datasets. However, conventional decision...
Water environmental problems of river basins in china are becoming more and more serious. Whereas, the environmental watchdogs at different levels provide comparatively independent water environmental data and use various kinds of data patterns, which makes it difficult to resolve the problems in a comprehensive way and make a unanimous decision as to how to deal with the worsening water environment...
Detailed description of land use/land cover change of China during the past hundred years not only help us understand the impacts of human-induced land use/land cover change on climate change and carbon cycles, but also reflect the true role of land use/land cover change of China in the global climate change. Hence, this article tries to propose a methodological framework on the reconstruction of...
As an analysis method for temporal and spatial variations, the hot spot analysis is an effective way to reveal the implied relationship among events. Crime hot spots analysis is fundamentally important for the public safety, and can contribute to combat and prevent crime. In this study, the monthly hotspots of thefts and robberies in Shanghai in 2009 are analyzed and mapped by using the hotspot analysis...
The MODerate resolution Imaging Spectroradiometer (MODIS) data were widely used to estimate land surface evapotranspiration (ET). However, the MODIS ET estimates may not close the land surface water budget. A MODIS ET estimation approach was implemented in the Yellow River Basin of China from 2002 to 2004. The MODIS ET estimates were compared with the estimates from a water budget approach that inferred...
Web services provide a web-based solution to achieve the interoperability of geospatial information processing — meanwhile specialized users such as hydrological scientists require more advanced services for analyzing and processing huge volumes of data. River channel storage volume calculation is one of important hydrological processes for decision of anti-flood. This paper presents a web processing...
At present, there are vast amounts of information and applications available in distributed environment with heterogeneous databases, how to find them is a crucial task. An ontology-driven approach is put forward to overcome semantic heterogeneity caused by synonyms and homonyms during keyword-based search in catalogues. An ontology has a key role to play in the development of a spatially aware search...
The floating population (FP) is a concept in the background of China's particular household registration system. Most of the reported researches on FP were conducted with the census data and few of them concerned the potential value of remotely sensed (RS) data in the area. A methodology was described on how to extract indication information of the spatial distribution of FP using SPOT5 and ground...
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...
A new methodology of spatial index is studied under mobile geographic information system (GIS) environment based on smart phone. Key technologies are presented in the methodology, including R-tree structure, quad-tree structure, and mobile GIS. In order to deal with the problem between the limited processing speed and low memory of smart phone with the high speed inquire of mobile GIS, a new spatial...
This paper briefly describes the conception of map aesthetics research, and concludes the aesthetics characteristics of map. Then the aesthetics characteristics of map in information time are expatiated by comparing the differences between paper map and electric map. This research may supply some valuable references for aesthetics study of map in the future.
Based on underwater terrain datum of Shanghai petrochemical Co. LTD's frontier area, the corresponding digital elevation model was built by GIS to analyze the law of erosion/accretion in Jinshan deep groove and the frontier area nearby systematically. The results show that: The erosion exceeds accretion in Jinshan deep groove near frontier area from 2000 to 2008. 2002 is turning. Accretion plays an...
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 will detail how the Center for Geographic Analysis, Harvard Map Collection, and Harvard Geospatial Library work together to enable medical and public health research across Harvard University. It will discuss geographic concepts that apply to medicine and public health, pertinent data available in geographic format, and analytical techniques. The workflow methodology the CGA has developed...
Flood disasters are among the world's most damaging types of disaster and occur frequently in the world, which cause great personal injuries and property damages. To improve flood risk management and decision-making, a flood risk assessment spatial decision support system architecture is proposed that capitalizes on the latest advances in remote sensing, geographic information systems, hydrologic...
Supported by coordinate multiple view (CMV) environment, triple-space is discussed in our previous paper [1]. In this paper, using eye movement technique, an evaluation work is discussed to understand whether the concept of triple space can help user to find their work space, and guide the users to find the answer easily and efficiently.
Scattered settlements are composed mainly of individual buildings that can be seen as point cluster. The selection properties of points include selectable, disposable and selectable-or-disposable. According to the traditional basic theory relative to selection of scattered settlements, the basic idea to select scattered settlements is put forward. The selection of point cluster is transformed gradually...
This paper aims at developing a fusion method based on SVR (Synthetic Variable Ratio) to preserve spatial details and spectral characteristics in image fusion processing, coupling several experiments are conducted for different kinds of sensors (ETM+, QuickBird), and fusion performance evaluation results show that this method is not related to sensor type, spectral region of images and number of multispectral...
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...
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