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This paper studies on how to improve the efficiency of multilayer relationship checking, which was the most complex and time-consuming operation in land plan spatial data quality checking. The existing researches on spatial data quality mostly focused on how to evaluate spatial data quality, but few studies on efficiency. With an in depth study on the characteristics of multilayer relationship, we...
Tile caching technology can significantly improve the efficiency of WebGIS systems. However, the current tile caching only works well on data that is never or seldom updated. Hence, traditional tile caching could not be applied to editable WebGIS. This paper proposes a dynamic tile caching method (D-TileCaching), by which tile caches can be updated in real time and thus are applicable for editable...
In order to facilitate the management and production of remote sensing images, in this paper, combine IDL(Interactive Data Language)by which visual interface is supported with ENVI(The Environment for Visualizing Images) image processing user functions, base on the technology of using Chinese standard map division and map sheet numbering system of different basic scales, the geometric corrected remote...
Coal mined-out section is the main harmful engineering geological problem and crucial restraint of western Beijing-Fuzhou Express Way around the city. In order to control the distribution and expansion for mining subsidence areas along the line, TM87, TM94 and ETM2000 remote sensing images are adopted as the information source to bring into play the rapidity, accuracy and strong periodicity of remote...
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