Geo-spatial Information Science

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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
Computer-assisted DEM-based aero photography design
Geo-spatial Information Science - Tập 11 - Trang 26-30 - 2008
Yewen Fan, Jianya Gong, Chengguo Tan, Ruiyao Wang
In aerial photography, the primary factor is terrain undulation. However, most of the external aerial photography software used for aerial photography design do not take terrain undulation influence into consideration. Therefore, the design result has comparative randomicity and “gaps” are expected. An aerial photography design system is developed by analyzing the terrain undulation influence to t...... hiện toàn bộ
Snow information abstraction based on remote sensing data: Taking the north of Xinjiang for example
Geo-spatial Information Science - Tập 12 - Trang 56-60 - 2009
Huan Pei, Shifeng Fang, Zhihui Liu, Zhihao Qin
This paper proposes an applicable approach for snow information abstraction in northern Xinjiang Basin using MODIS data. Linear spectral mixture analysis (LSMA) was used to calculate snow cover fractions (SF) within a pixel, which was used to establish a regression function with NDSI. In addition, 80 snow depths samples were collected in the study region. The correlation between image spectra refl...... hiện toàn bộ
Feasibility of estimating heavy metal contaminations in floodplain soils using laboratory-based hyperspectral data—A case study along Le’an River, China
Geo-spatial Information Science - Tập 14 - Trang 10-16 - 2011
Yaolin Liu, Wei Li, Guofeng Wu, Xinguo Xu
It is necessary to estimate heavy metal concentrations within soils for understanding heavy metal contaminations and for keeping the sustainable developments of ecosystems. This study, with the floodplain along Le’an River and its two branches in Jiangxi Province of China as a case study, aimed to explore the feasibility of estimating concentrations of heavy metal lead (Pb), copper (Cu) and zinc (...... hiện toàn bộ
A method for generating contour tree based on voronoi interior adjacency
Geo-spatial Information Science - Tập 8 - Trang 287-290 - 2005
Qiao Chaofei, Zhao Renliang, Chen Jun, Chen Yunhao
A contour tree is a good graphical tool for representing the spatial relations of contour lines and has many applications in map generalization, map annotation, terrain analysis, etc. A new method for generating contour trees by introducing a Voronoi-based interior adjacency concept is proposed in this paper. The immediate interior adjacency set is employed to identify all of the children contours...... hiện toàn bộ
Equivalence of network-solution and PPP-solution
Geo-spatial Information Science - Tập 9 - Trang 99-102 - 2006
Peng Lin, Liu Yanxiong, Zhou Xinghua, Wu Yongting
The technique of precise point positioning (PPP) is gradually becoming a popular method in GPS data-processing. In GPS observation equation, the unknown parameters can be separated into two parts: global parameters and local parameters. The global parameters include orbit, satellite clock and geodynamic parameters. The local parameters are site-occupation-spectific, such as position, tropospheric ...... hiện toàn bộ
Estimation of geodetic parameters with VLBI data of last 5 years
Geo-spatial Information Science - Tập 10 Số 1 - Trang 12-16 - 2007
Erhu Wei, Jingnan Liu, Chuang Shi
Application of remote sensing and GIS technology to the study of desertification of arable lands in North Shaanxi, China
Geo-spatial Information Science - Tập 7 - Trang 187-192 - 2004
Mushtak Talib Jabbar, Hu Guangdao, Zhang Zhenfei
The policy of the Chinese government concerning the horizontal expansion of the cultivated land through the reclamation of desert soils result in a total increase of 665. 985 km2 during the period 1987–1999 in North Shaanxi. This increase is less than the loss in arable land by urbanization. The accelerated rate of change in agricultural areas calls for more rapid surveys of urbanization and loss ...... hiện toàn bộ
Study on gis data directly integrated into image processing
Geo-spatial Information Science - Tập 3 - Trang 16-19 - 2000
Guan Zequn, Li Deren
The basic properties to be dealt with, when considering initially the research needs related to the integration of remote sensing (RS) information into a geographic information system (GIS), are many-sided. The primary combination of remote sensing and GIS is mainly realized by the transforms of data structure. Because of its own limitations, there is an urgent need to investigate the integration ...... hiện toàn bộ
The process of making 3D vector scenograph of ancient building with large quantities of data
Geo-spatial Information Science - Tập 3 - Trang 43-47 - 2000
Zhu Yixuan, Chen Zhiyong
This paper introduces the process of making 3D vector scenograph of an ancient building with large quantities of data with the aid of AutoCAD, which displays the effect of scenery drawings. The vital skills and technique involved are illustrated through the example of Pagoda of Thousands of Buddha in Chi Lin Nunnery in HongKong. This construction was started in 1996 and finished in 1999 with the c...... hiện toàn bộ
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