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Global warming and rapid urbanization have great impacts on local temperature and urban heat island (UHI) effects. However, most of the previous research paid very little attention to the impact of natural terrain on UHI effects. This work reported the effects of complex terrain on UHI characteristics. As the second largest city in Northwest China, Lanzhou was selected as the research region since...
The space relation of contour plays an important role in aspects of topographic map reading and map integration. Tree structure is highly valued as a common tool to show space relation by investigators. Studies before focused on inclusion relation of closed contours, which is complicate to build a tree structure and has a high requirement on data. Open contour occurs more and adjacent relation between...
The explosion of web-based GIS technologies and the opening up of mapping services to citizens in the past decade have resulted in a whole range of Volunteered Geographic Information (VGI) communities like OpenStreetMap, Ushahidi, and Wikimapia, which are used to assist emergency management operations on a large scale. However, many crowdsourcing systems for disaster recovery have multiple obstacles...
3D maps of emergency scenes offer more intuitive and more detailed spatial information to support emergency decision making. In this paper, the methodology of UAV route planning is introduced, which is used to guide the process of oblique photograph data collection for efficient 3D reconstruction of building model, and its practical problems during processing are analyzed. The methodology would meet...
To date, the basis of eigenvector spatial filtering is solely the centered spatial weights matrix (SWM) that is part of the Moran Coefficient (MC). The Laplacian matrix, < CI >diag-C offers an alternative transformation of the SWM, one associated with the Geary Ratio (GR), another popular measure of spatial autocorrelation (SA). This paper compares these two specifications, respectively denoted...
The regional differences in socioeconomic and resource endowments lead to significant spatial heterogeneity of farmland conversion. It is the basis for optimizing the allocation of land resources to carry out non-agricultural pressure measurement and reveal its spatio-temporal evolution pattern. In this paper, the evaluation index system of farmland non-agricultural pressure is constructed from four...
Identifying influential nodes in multilayer networks, such as networks in an LBSN, has attracted much attention because of its great theoretical significance and wide application. Existing methods are limited to a single network and don't consider some social environmental factors, such as social constraints and human motion. In this paper, firstly, we propose a geo-social multilayer with two layers...
Analyzing the spatial distribution of residential land and its spatial distribution relations with residential facilities and transportation facilities is of great reference value for the regional optimal allocation of human settlements and the balanced development of human settlements. This paper took Wuhan City Development Zone as an example, and used the sixth census data and survey data of urban...
In recent years, the large shopping center has become a major shopping and leisure venues. Facing the rapid locating demand of large shopping center, this paper built the toponym ontology on the basis of toponym concepts, and explored the representation of the spatial relationships based on previous researches, and summarized inference rules of the qualitative spatial relationships, and proposed rapid...
Taking Xiamen city as the study area, this research retrieved sensible heat flux by using meteorological data and Landsat 5 TM images of the four seasons in 2009. Meanwhile the 65 different landscape metrics of each analysis unit were acquired by landscape analysis method. Then the most effective landscape metrics, which could affect sensible heat flux, were determined by correlation analysis, partial...
With the growing traffic accidents, cities meet the problem of traffic safety. In order to reduce the traffic accidents, vehicle collision's spatio-temporal distributions and characteristics need to be analyzed. This paper focuses on investigating the spatio-temporal distributions and characteristics of vehicle collisions and detecting the accident prone streets. Besides, an optimal safe route method...
Research shows that public events can be violence attractors or generators. Recent studies focus on the effect of crowd events on spatial crime analysis, using environmental criminology theories as a background. Also, social media analyses show possible influences of social media in crowd movements. This study displays and correlates spatial patterns of crimes and tweets around two stadiums in Manchester,...
The optimal allocation of land resources is a reliable guarantee for sustainable land use. As one of the least developed countries in the world with rich land resources, Laos needs scientific, reasonable and efficient use of land resources to promote the comprehensive development of economy and society. Considering that the spatial distribution of land resources is extremely uneven and the land use...
Accessibility to healthy and nutritious foods is a crucial factor for public health outcome. This paper proposed a store square footage-to-population ratio as indicator of spatial accessibility to food stores. An enhanced floating catchment area method is used to compute the store footage-to-population ratio. The method adopts the Huff Model to model the people's selection on food stores and consider...
To improve wildfire responses by making and implementing safe, effective and efficient management decision, predictive services has been created to better preparing and responding to wildfires. Recently, efforts had been made to strengthen the capabilities on collecting and integrating timely weather information for improving the predictive services products. Previously, the weather information source...
In recent years, air pollution is getting more severe in China, especially fine particulate matter (PM2.5). However, ground monitoring stations are sparse and distributed unevenly, causing difficulty in analyzing the spatial variation of PM2.5 concentration over a large area. More and more research is aimed at estimating PM2.5 using global regression model, ignoring the spatial heterogeneity in PM2...
Surveying accuracy is a very important parameter in any surveying or mapping project. While there are many national standards that specify the accuracy levels to be achieved, there is no established principle for determining the optimum accuracy. This paper attempts to introduce such a principle.
Recently, driven by innovation of GPS technology, mobile location-based applications were a development of blowout. Trajectory data which contains mining valve is widely distributed and large-scale. How to organize trajectory data on a global scale and support efficient range queries becomes a problem. This paper presents a framework of adaptive Geohash-Tree based on Secondo database to organize the...
With the development of positioning technologies and the increasing popularity of location-aware devices, large volumes of trajectory data have been accumulated. However, efficient management and access to massive trajectory data remains a big challenge. The emerging NoSQL database has provided a promising solution for this challenge. But most of the current NoSQL databases do not support direct spatiotemporal...
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