Geo-spatial Information Science

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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
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
Performance analysis of integrated GPS/GLONASS carrier phase-based positioning
Geo-spatial Information Science - Tập 4 - Trang 9-18 - 2001
Dai Liwen, Han Shaowei, Chris Rizos
Due to the different signal frequencies for the GLONASS satellites, the commonly-used double-differencing procedure for carrier phase data processing can not be implemented in its straightforward form, as in the case of GPS. In this paper a novel data processing strategy, involving a three-step procedure, for integrated GPS/GLONASS positioning is proposed. The first is pseudo-range-based positioni...... hiện toàn bộ
Texture image segmentation based on nonlinear diffusion
Geo-spatial Information Science - Tập 11 - Trang 38-42 - 2008
Yu Zhang
A texture image segmentation based on nonlinear diffusion is presented. The scale of texture can be measured during the process of nonlinear diffusion. A smooth 5-channel vector image with edge preserved, which is composed of intensity, scale and orientation of texture image, can be achieved by coupled nonlinear diffusion. A multi-channel statistical region active contour is employed to segment th...... hiện toàn bộ
Spectral features of soil organic matter
Geo-spatial Information Science - Tập 12 - Trang 33-40 - 2009
Ting He, Jing Wang, Zongjian Lin, Ye Cheng
The study on soil spectral reflectance features is the physical basis for soil remote sensing. Soil organic matter content influences the soil spectral reflectance dramatically. This paper studied the spectral curves between 400 nm∼2500 nm of 174 soil samples which were collected in Hengshan county and Yixing county. Fourteen types of transformations were applied to the soil reflectance R to remov...... hiện toàn bộ
Method and application of comprehensive knowledge discovery
Geo-spatial Information Science - Tập 6 - Trang 48-55 - 2003
Sha Zongyao, Bian Fuling
This paper proposes the principle of comprehensive knowledge discovery. Unlike most of the current knowledge discovery methods, the comprehensive knowledge discovery considers both the spatial relations and attributes of spatial entities or objects. We introduce the theory of spatial knowledge expression system and some concepts including comprehensive knowledge discovery and spatial union informa...... hiện toàn bộ
4D data fusion technique in urban waterlog-draining decision support system
Geo-spatial Information Science - - 2000
Jun Li, Bian Fuling
Kiểm tra điểm trong đa diện với việc xử lý trực tiếp các trường hợp suy biến Dịch bởi AI
Geo-spatial Information Science - Tập 14 - Trang 91-97 - 2011
Shulin Cui, Shuqing Zhang, Xuanxi Chen, Zhenping Pang, Xiaoyang Fu, Xu Zhang
Vấn đề Kiểm tra Điểm Trong Đa Diện là xác định xem một điểm có nằm trong hay ngoài một đa diện cho trước hay không. Khi phát hiện một trường hợp suy biến, các thuật toán truyền thống dựa trên tia cắt thường né tránh trường hợp này bằng cách chọn một tia khác hoặc xóa trường hợp bằng cách làm biến đổi dữ liệu đầu vào. Bài báo này giới thiệu một thuật toán Cắt Tia Dựa Trên Ngưỡng (Threshold-Based Ra...... hiện toàn bộ
#Kiểm tra điểm trong đa diện; Thuật toán cắt tia; Suy biến; Tối ưu hóa thuật toán; Hiệu suất.
Tổng số: 451   
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