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The standard geographic web services WMS (web map service) and WFS (web feature service) comprise respectively two methods GetFeature and GetFeatureInfo that allow to obtain attributes associated to a geographic object represented on a map. Most certainly, the returned result brings semantics to the object but requires adaptation to the theme chosen by the user. Our paper proposes the conception and...
Center of gravity is an important index to describe spatial distribution of geographical objects, it can exactly reflect spatial distribution and evolution characteristics of geographical elements. Using gravity model, this paper makes a detailed analysis on variation track about urban land price and land spatial expansion of Shijiazhuang from aspects of location, moving direction, distance of land...
A growing number of organizations and individuals improve efficiency by utilizing geographical data. When the geographical data are updated, the changed information must be transferred to the end-users to keep their client-databases current. Distinguishing and identifying the change types of the geographical objects is the premise of transferring the change information. But now the methods for classifying...
Maps on the Internet are enhanced with many types of information and annotations. Searching these digital maps by directory sevices can yield more information about places and objects on the maps. However, when there is a large amount of information, the user difficult to find geographical objects according for user's intention. In other words, searches by directory sevices do not always present the...
The analysis of geographical changes has been one of the important directions of the GIS research agenda over the past ten years. But an explicit representation of increment change which clearly describes the semantics of change and supports the database tracking of geographical changes are not completely considered within current researches. In order to clearly distinguish the increment change, we...
In this work, we studied how to rapidly match remote sensing images by the semantic information of geographical objects in Grid architecture and how to slice, index, and assemble each tiled image in every grid node. We first designed the grid architecture of remote sensing images sharing and gave a new idea that searching corresponding images by semantic information of geographical objects. To each...
Radar sensor network performance for inland water surveillance is dependent on spatial character of terrain. Terrain shape, elevations and all geographical object situated in the river zone are potential barriers for microwaves propagation and are main sources of radar shadows. Thus, some complicated geometry of terrain surface can cause difficulties during proper localisation of radar sensors, which...
Societies cope with their geographical environment with the help of objects and categories of objects. Objects are cognitive symbols enabling societies to come to terms with the incertainties and complexity of the real. This text begins by presenting processes of objectivation and of categorisation of geographical reality. Then, it analyses how far categorisation of objects influences the practice...
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