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This paper analysis mainstream technology of WebGIS and introduces the information publishing platform that is developed with the Applet/Servlet technology, mixed computing pattern. The method adopts prefetching strategy of remote objects and utilizes RMI to transfer or communicate remote objects in Server side. The platform Client display and control by Java Applet. The logic functional modules of...
We need to separate GPS height area Quasi-geoid into several parts when transforming GPS height in a large area, and the height abnormal precision on the unknown points is related deeply to the distribution of the known points, the paper puts forward that we should separate GPS height area for every unknown point in order to obtain higher precision, therefore, it will take much time and energy to...
Conversion of GPS heights into normal heights has become a hotspot in survey engineering, the Quasi-geoid surface can be very complicated especially in a large survey area or in complicated terrain, just adopting several GPS/leveling points to construct quadric surface model to fit the Quasi-geoid surface has some limitations, precision could not be guaranteed. So, such demand us that we should partition...
Interpolation is the core problem of Digital Elevation Model ??DEM??. A concept of Voronoi K order adjacency is introduced in this paper, and a DEM interpolation method based on this concept is described. This method selects Voronoi k order adjacency points for reference points and determines weighting functions with both Euclid distance and Voronoi distance. The experiments have shown that this method...
With the rapid development of urbanization and the rapid development of information technologies, the amount of valuable data captured in different systems and different structures grew and technical progress made it possible to exchange and share data by these different systems and different structures. Urban information is a kind of multi-sources data, which not only contains spatial data, but also...
With the rapid development of urbanization in China and the rapid development of spatial and information technologies, the amount of valuable data captured in different systems and different structures grew and technical progress made it possible to link these different systems and different structures, the wish to exchange and share these data arose and became more and more important. But the combination...
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