Geo-spatial Information Science

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Contribution to the investigation of structure and origin of the east African graben by gravimetry
Geo-spatial Information Science - Tập 8 - Trang 291-296 - 2005
Tondozi Keto, Liu Tianyou
For our investigation we have 235 measurements done in the east part of Democratic Republic of Congo by P. Herrinck during a magnetic survey including the graben region from the parallel joining Goma city and Mahagi city, the region between Albert and Aka lakes, and the route from Aba to Kinsagani. During the surveys the density of recording points has been selected according to the importance of ...... hiện toàn bộ
Research on data consistency in spatial database system
Geo-spatial Information Science - Tập 3 - Trang 24-29 - 2000
Zhu Xinyan, Wen Yi, Li Deren, Gong Jianya
In this paper, two cases of data consistency problems are discussed in Multi-user Geographical Information System. When a user updates some spatial data that have been accessed by other users in database, or executes an UNDO/REDO operation, data consistency will probably be destroyed. To solve the problem caused by the first case, a “Notification-Reread Method” is introduced. As for the second cas...... hiện toàn bộ
The stochastic estimation of satellite clock correction information in WADGPS
Geo-spatial Information Science - Tập 3 - Trang 66-69 - 2000
Hüseyin Bąkilz, GE Maorong, Esmond Mok
Using autocorrelation information of the pseudorange errors generated by selective availability (SA) frequency dithering, we have constructed a simple first order stochastic model for SA effects. This model has been used in a Kalman filter to account for the stochastic behavior of SA dithering in estimating satellite clock information in wide area differential GPS. We have obtained fifteen percent...... hiện toàn bộ
Application of refactoring and design pattern in land information system development
Geo-spatial Information Science - Tập 10 - Trang 299-302 - 2007
Luyao Chen, Jianwei Yue, Weiguo Jiang, Jing Li, Yunhao Chen
The unceasing change problem of land information systems can be resolved through the refactoring and design pattern. To promote the implementation of design pattern and refactoring methods in developing land information systems reusing software design, applying refactoring methods to the abstract factory and decorator design patterns in land information system development is discussed.
Fuzzy clustering validity for spatial data
Geo-spatial Information Science - Tập 11 - Trang 191-196 - 2008
Chunchun Hu, Lingkui Meng, Wenzhong Shi
The validity measurement of fuzzy clustering is a key problem. If clustering is formed, it needs a kind of machine to verify its validity. To make mining more accountable, comprehensible and with a usable spatial pattern, it is necessary to first detect whether the data set has a clustered structure or not before clustering. This paper discusses a detection method for clustered patterns and a fuzz...... hiện toàn bộ
Monitoring the deformation of cableways
Geo-spatial Information Science - Tập 5 - Trang 18-21 - 2002
Dante Salvini
One type of aerial cableway consists of a continuous cable, which works at the same time as carrying cable and drawing cable. This kind of cableway is supported by many towers, which divide the total length in linear sections. Even small deviations from the planed layout can increase the strain of the cable and the danger of derailments. The deviations of the position of the towers from the planed...... hiện toàn bộ
Parallel machine problems with a single server and release times
Geo-spatial Information Science - Tập 8 - Trang 148-151 - 2005
Shi Ling
Parallel machine problems with a single server and release times are generalizations of classical parallel machine problems. Before processing, each job must be loaded on a machine, which takes a certain release times and a certain setup times. All these setups have to be done by a single server, which can handle at most one job at a time. In this paper, we continue studying the complexity result ...... hiện toàn bộ
A new vector data compression approach for WebGIS
Geo-spatial Information Science - Tập 14 Số 1 - Trang 48-53 - 2011
Yunjin Li, Ershun Zhong
An improved energy balance approach and its application in CHAMP gravity field recovery
Geo-spatial Information Science - Tập 11 - Trang 168-173 - 2008
Tianhe Xu, Kaifei He
An efficient method for gravity field determination from CHAMP orbits and accelerometer data is referred to as the energy balance approach. A new CHAMP gravity field recovery strategy based on the improved energy balance approach is developed in this paper. The method simultaneously solves the spherical harmonic coefficients, daily integration constant, scale and bias parameters. Two 60 degree and...... hiện toàn bộ
Investigation of image fusion between high-resolution image and multi-spectral image
Geo-spatial Information Science - Tập 6 - Trang 31-34 - 2003
Li Pingxiang, Wang Zhijun
On the basis of a thorough understanding of the physical characteristics of remote sensing image, this paper employs the theories of wavelet transform and signal sampling to develop a new image fusion algorithm. The algorithm has been successfully applied to the image fusion of SPOT PAN and TM of Guangdong province, China. The experimental results show that a perfect image fusion can be built up b...... hiện toàn bộ
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