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This paper presents a geo-statistical method to study the spatial relationship between landslides and their inner-factors on the regional scale in order to predict the regional susceptibility of landslides. The approach is based on digital databases, along with such methods as statistics, spatial analysis based on Geographic Information System, and interactive mapping. The prediction map of study...
The prediction of the dominant migration pathways of oil and gas migration is a key issue. The article starts from the parametric comprehensive analysis of the controlling factors such as transport system, energy field, etc. Through the establishment of the quantitative relationship between the various parameters and the dominant migration pathways, we use spatial analysis methods after the conversion...
The polygon orientation identification and point-in-polygon query algorithm for GIS polygon is in the course of improvement. Robust algorithms are presented in this paper. By comparing the serial number of polygon's four (or three, two) extreme points, the polygon's orientation can be identified, the main computation in the new algorithm is only integers' comparison. By finding the shortest point...
At present the development of geographic information system has gradually shifted from 2D to 3D. With the urgent need of 3D geographic information system in the fields of petroleum, geology, town planning, marine, and environmental, how to construct 3D digital map efficiently and easily is the key technology to establish 3D Geographic Information. Implementation method of 3D digital map based on SketchUp...
Base on synthetically analysis of Mountains terrain characteristics, this paper uses analytic hierarchy process (AHP) to study classification of Mountains terrain characteristics of the Sichuan Mountains which lies in China's Sichuan Province, according to applying characteristics of AHP. This paper builds the recursion stage structure model using to the mode of highestlevel, middle-level and lowest-level...
Landslides, which develop in the Three Gorges Reservoir area, are caused by many factors. Gradient is one of the indispensable internal factors, besides lithology, relative height difference and slope profile. This paper studies how gradient affects regional landslide from Yunyang to Wushan segment in the Three Gorges Reservoir Area, and also focuses on quantifying the effect of gradient on landslides...
The reforms of the agricultural irrigation management become the important content of the construction of the conservation-minded society and new socialist countryside, however, the traditional management of client/server mode can't meet the requirements. Consequently, the optimization of the irrigation management is inevitable according to the development of the irrigation facilities and the complication...
In order to meet the requirement of the real-time data surveying of land utilization, an efficacious land survey GPS handset system was presented in this paper. In the system, a design pattern based framework was given out to increase its reusability, flexility and maintainability of Embedding GIS. Encapsulation for command like actions by applying COMMAND pattern was proposed for the problem of complex...
The paper presents an innovative spatial data model approach named MLGL (mapsheet-layer-grid-level) to mobile geoinformatics and cartography (MGC) for field land survey. First, the characteristics of MGC environment are analyzed. Then, one county's spatial data of land use is broken into several town map sheets according as the administrative boundaries. Each map sheet contains multi controllable...
In this paper, an integrated farm information management system (IFIMS) is constructed through analyzing the mechanism and characteristics of component GIS. On the basis of the B/S architecture, a development pattern that integrated Microsoft .NET platform and the component SuperMap is applied to the system according to the requirements of farm production. The system is utilized for the integrated...
While an earthquake occurs especially in depressed areas or mountainous regions, the survey of damage loss becomes arduous because of chaos and awful communication condition. A solution is proposed that using RS (remote sensing) and GIS (Geographic Information System) techniques assesses seismic damage loss for emergency, which need establish a spatial database to store the necessary data. In this...
This paper introduces geography information system (GIS) into intelligent decision support system (IDSS) and proposes a 4 database and 1 machine frame model. On this basis we design the target assignment intelligent decision support system (TAIDSS), realize the close combination of IDSS, GIS and decision-making model, then we propose an intelligent target assignment decision model which contains knowledge...
In the course of updating the GIS database of land use data, the multi-source data always canpsilat match well. In order to update the GIS database of land use data more effectively, scientifically, reasonably and esthetically, based on the GIS data updating quomodo and the practical requirement of land use data updating, a data fusion algorithm of GPS/GIS is presented in the paper. By establishing...
In this paper, we propose a design pattern based multi-scale representation framework that encapsulate these spatial index based multi-scale algorithms and treat this framework as a middle layer between the underlying GIS SDK and up-level applications. This framework is mainly composed of three well-known design patterns BRIDGE, STRATEGY and VISITOR, which act as a bridge forwarding up-level requests...
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